| AVICI SYSTEMS INC      ITEM 1A    RISK FACTORS          Our company, business and operations are subject to a number of risks and     uncertainties | 
    
    
      | We discuss material risks and uncertainties below | 
    
    
      | To the     extent any of these risks and uncertainties materialize, our business,     results  of operation and financial condition would suffer | 
    
    
      | You should     carefully consider these risk factors in evaluating our company | 
    
    
      | We are reliant on our major customer AT&T and we expect that substantially     all of our revenues will be generated from a limited number of networking     service  providers | 
    
    
      | Our revenues will not grow if our products are not     selected for or do not successfully pass field trial tests, or are not     increasingly deployed in customer networks | 
    
    
      | In 2004,     Huawei and Nortel accounted for 27prca and 12prca, respectively, of gross revenue | 
    
    
      | We expect that in the foreseeable future substantially all of our revenues     will continue to depend on sales of our products to a limited number of     customers and we have adjusted our corporate strategy to focus our efforts     on  a  target  customer  base,  particularly  AT&T,  and  core product     functionalities | 
    
    
      | The  loss of or reduction in business from any major     customer could materially reduce our revenue and cash flow, and adversely     affect our ability to achieve and maintain profitability | 
    
    
      | On November 18, 2005, AT&T completed its merger with SBC Communications | 
    
    
      | This development gives rise to new opportunities and risks as our major     customer experiences changes associated with integrating two businesses | 
    
    
      | We     will  need  to  build on our existing relationships at AT&T, build new     relationships,  address  competitive  challenges and adapt our product     development  and  customer service activities to meet the needs of the     resulting entity | 
    
    
      | 11     ______________________________________________________________________    [35]Table of Contents       In addition, we are dependent on factors affecting the telecommunications     industry | 
    
    
      | The telecommunications industry has and may continue to experience     consolidation, changing technical requirements and changing demand for     services | 
    
    
      | Any such factors or other factors affecting the telecommunications     industry or carrier customers could cause a downturn in the demand for our     products | 
    
    
      | We currently depend on a limited number of products offered in the core     routing market segment and our future revenues depend on enhancements to     these products and their commercial success | 
    
    
      | Our future growth and revenue depend on the commercial success of our TSR,     SSR and QSR products, which are the only products that we currently offer | 
    
    
      | We offer these products in the core routing market segment | 
    
    
      | We must continue     to enhance the features and functionality of our products to meet customer     requirements and competitive demands | 
    
    
      | In addition, the failure of these     planned product enhancements to operate as expected could delay or prevent     future sales of our products | 
    
    
      | If our target customers do not adopt, purchase     and successfully deploy our products and our planned product enhancements,     our revenues could decrease significantly | 
    
    
      | Our sales cycle to new and existing customers is lengthy, and we may expend     considerable resources without resulting revenue | 
    
    
      | Our sales cycle typically involves a lengthy sales consultation process     followed by laboratory testing in which our product is evaluated against     competing  products | 
    
    
      | If our product is selected for field trials after     laboratory  testing,  our  product  is  then  tested in an operational     environment | 
    
    
      | Generally,  our customers do not contractually commit to     purchase  any products from us until we have successfully demonstrated     specific performance criteria in these field trials | 
    
    
      | We cannot predict     whether our products will successfully complete laboratory tests or field     trials with particular customers or whether these customers will order and     commercially deploy our products in meaningful volumes | 
    
    
      | The failure of     current or prospective customers to purchase our products for any reason,     including the failure to pass field trials, any determination not to install     our products in their networks or any downturn in their business, would     seriously harm our ability to build a successful business | 
    
    
      | Even if we are     successful in promoting the adoption of our products, customers usually     test, purchase and deploy competitive products for various segments of their     networks | 
    
    
      | Accordingly, we will likely face additional competitive challenges     in maintaining and expanding our position in established customer accounts | 
    
    
      | We  have reduced our direct sales capability as a result of our recent     restructuring and our indirect sales channels have had limited success,     accordingly, we are likely to face difficulties in obtaining and retaining     customers through direct and indirect sales channels | 
    
    
      | Our products have historically required a sophisticated and in depth sales     effort targeted at key individuals within worldwide target end user customer     organizations | 
    
    
      | We have achieved limited success through both our direct and     indirect sales channels | 
    
    
      | In connection with the restructuring of our business, we have reduced our     direct sales and marketing force | 
    
    
      | We currently do not plan to staff our     direct sales force at 2005 levels or hire a significant number of additional     sales personnel or, unless warranted by customer activity, engineering     personnel | 
    
    
      | The competition for qualified individuals is intense, and our     ability  to hire the type and number of sales, engineering or customer     service and support personnel that we may need in the future will remain     subject to competitive pressures | 
    
    
      | To date, we have entered into agreements with a number of regional systems     integrators and distribution partners, including Nortel Networks, on a     worldwide basis, and Huawei Technologies in Greater China | 
    
    
      | The relationships     with these systems integrators and distribution partners have not produced     the results we anticipated when entering into these relationships | 
    
    
      | These     systems integrators and distribution partners do not have any purchase     commitments associated with our agreements with them and, generally, are not     prohibited from selling products that compete with our products | 
    
    
      | We cannot     be certain that such partners will devote adequate resources                                           12     ______________________________________________________________________    [36]Table of Contents       to marketing or selling our product or generate significant revenue in order     for us to achieve and maintain profitability | 
    
    
      | Gross margin on distribution     sales are lower than those on direct sales | 
    
    
      | Accordingly, to the extent that     a higher percentage of our revenue is derived from distribution sales, it is     expected that our gross margin percentage will decline from current levels | 
    
    
      | There  can  be no assurance that incremental revenue from distribution     channels will be sufficient to offset the decline in gross margin dollars | 
    
    
      | Our current strategy does not include the development of and investment in     indirect sales channels outside of specific core customer opportunities | 
    
    
      | Our plan to restructure our business and realign our cost structure may not     produce the expected performance improvements and cost savings within the     projected timeline | 
    
    
      | We have announced a plan to restructure our business to focus our efforts on     our  core  customers  and  core  functionalities | 
    
    
      | The benefits of this     restructuring are expected to be significant performance improvements and     cost savings | 
    
    
      | However, there is no way to gauge the actual impact of the     restructuring  or  the  amount  and  timing  of either the performance     improvements or the cost savings | 
    
    
      | In addition, the restructuring will result     in significant charges and a reduction in our staff and capabilities in key     areas such as sales and marketing, product development and engineering and     international operations | 
    
    
      | Because of this, the restructuring may not produce     immediate results on our financial indicators and may cause the trading     price of our common stock to decrease materially | 
    
    
      | Our failure to compete effectively, particularly against Cisco Systems,     Juniper Networks, and other established participants with greater financial     and other resources than ours, could limit our ability to increase our     market share | 
    
    
      | The competition in the network infrastructure equipment market is intense | 
    
    
      | This market historically has been dominated by Cisco Systems, although we     also compete with other companies such as Juniper Networks | 
    
    
      | Our prospective     customers may be reluctant to replace or expand their current infrastructure     solutions, which may be supplied by one or more of these more established     competitors,  with our products | 
    
    
      | Further, many of our competitors have     greater selling and marketing, technical, manufacturing, financial and other     resources, more customers, greater market recognition and more established     relationships and alliances in the industry | 
    
    
      | As a result, these competitors     may be able to develop, enhance and expand their product offerings more     quickly, adapt more swiftly to new or emerging technologies and changes in     customer demands, devote greater resources to the marketing and sale of     their offerings, pursue acquisitions and other opportunities more readily     and adopt more aggressive pricing policies | 
    
    
      | In addition, established or     emerging network equipment vendors may also focus on our target market,     thereby further intensifying competition | 
    
    
      | In order to compete effectively     with these competitors, we must demonstrate that our products are superior     in meeting the needs of carriers and provide high levels of reliability,     scalability and interoperability in a cost-effective manner | 
    
    
      | In addition, we believe that understanding the infrastructure requirements     of telecommunications carriers and other service providers, experience in     working with these providers to develop new services for their customers and     an ability to provide vendor-sponsored financing are important competitive     factors  in  our  market | 
    
    
      | We  have limited experience in working with     telecommunications carriers and other service providers | 
    
    
      | In addition, we do     not currently anticipate an ability to provide vendor-sponsored financing     and this may influence the purchasing decision of prospective customers,     which may decide to purchase products from one of our competitors that offer     such financing | 
    
    
      | If we are unable to compete successfully against our current and future     competitors,  we  could  experience order cancellations, lost customer     opportunities and price and volume reductions | 
    
    
      | If this occurs, our revenues     may  decline, our gross margins could decrease and we could experience     additional material losses | 
    
    
      | 13     ______________________________________________________________________    [37]Table of Contents       Our failure to stabilize our revenues and manage our costs would prevent us     from achieving and maintaining profitability | 
    
    
      | We have incurred significant losses in each quarterly and annual period     since inception and expect to continue to incur significant losses in the     future | 
    
    
      | As of December 31, 2005, we had an accumulated deficit of dlra425dtta7     million | 
    
    
      | We cannot be certain that our revenues will increase or that we     will generate sufficient revenues to achieve profitability | 
    
    
      | We plan to     continue product development focused on our core customers and core product     functionality | 
    
    
      | These  efforts  will  continue  to require significant     expenditures, a substantial portion of which we will make long before any     significant  revenue related to these expenditures may be realized | 
    
    
      | In     addition, our operating expenses are based largely on anticipated revenue     trends and a significant portion of our expenses, such as personnel and real     estate facilities costs, is fixed | 
    
    
      | As a result, we will need to generate     significant  revenues and manage ongoing costs to achieve and maintain     profitability | 
    
    
      | If we fail to achieve such revenue levels, our operating     losses  could  continue  or  materially increase | 
    
    
      | We may never achieve     profitability or generate positive cash flows from operations | 
    
    
      | If we do     achieve profitability or positive cash flows from operations in any period,     we may not be able to sustain or increase profitability or positive cash     flows in the future | 
    
    
      | We rely on single or limited source suppliers for several key components | 
    
    
      | If     we  are  unable to purchase these components on a timely basis or upon     favorable  terms,  we  will not be able to deliver our products to our     customers  within  the timeframes required and we may experience order     cancellations | 
    
    
      | We currently specify and purchase through our contract manufacturers several     key components from single or limited sources | 
    
    
      | We have worked with LSI Logic     for over five years to develop several of our key proprietary application     specific integrated circuits, or ASICs, which are custom designed integrated     circuits built to perform a specific function more rapidly than a general     purpose microprocessor | 
    
    
      | These proprietary ASICs are very complex and LSI     Logic is currently our sole source supplier for them | 
    
    
      | We do not have a     long-term, fixed-price or minimum volume of supply agreement with LSI Logic | 
    
    
      | Our ASICs generally require a lengthy lead-time | 
    
    
      | If required, we would     likely be unable to develop an alternate source to LSI Logic in a timely     manner,  which  could  hurt our ability to deliver our products to our     customers | 
    
    
      | We also purchase other critical components, including optical     components, field programmable gate arrays and other ASICs, from sole or     limited  sources, and at times some of these components are subject to     allocation | 
    
    
      | In addition we established a strategic relationship with Intel     to supply certain network processors for use in our Multiservice Connect     family of line cards and have also established other relationships for     component supply | 
    
    
      | We do not have a long-term, fixed price or minimum volume     of supply agreement with such vendors | 
    
    
      | Although we believe that there are     alternative  sources  for  many of these components, in the event of a     disruption in supply, we may not be able to develop an alternate source in a     timely manner or at favorable prices | 
    
    
      | In  addition, our supplier of ASICs or other critical components could     discontinue the production of such components | 
    
    
      | LSI Logic has informed us     that the supply of certain key ASICs will be discontinued | 
    
    
      | In such an event,     we  may have the opportunity to make an end-of-life purchase of excess     inventory of such component, as we plan to do with these key ASICs | 
    
    
      | Changes     in demand for our product in the future may render our inventory stocking     purchase to be in excess or short of future requirements, and in the event     we  require  additional  supplies we may be unable to transition to an     alternative vendor on a timely or cost effective basis and we would be     subject to the risks described below | 
    
    
      | We typically specify and purchase through our contract manufacturers all of     our components, including our ASICs, under purchase orders placed from time     to time | 
    
    
      | We do not carry significant inventories of components and have no     guaranteed  supply  arrangements with our vendors | 
    
    
      | If we are unable to     purchase our critical components, or to provide for the production of our     ASICs, at times and in volumes as our business requirements necessitate, we     will not be able to manufacture and deliver our products to our customers in     accordance with their volume and schedule requirements | 
    
    
      | If we are not able     to satisfy the delivery requirements of our customers, they may reduce any     future orders or eliminate our status as a vendor | 
    
    
      | Our reputation also would     likely be                                           14     ______________________________________________________________________    [38]Table of Contents       harmed and, given the limited number of customers in our target market, we     may  not  be  able to replace any lost business with new customers | 
    
    
      | In     addition,  even  if we are able to obtain these critical components in     sufficient volume and on schedules that permit us to satisfy our delivery     requirements, we have little control over their cost | 
    
    
      | Accordingly, the lack     of alternative sources for these components may force us to pay higher     prices | 
    
    
      | If  we are unable to obtain these components from our current     suppliers or others at economical prices and favorable terms, our margins     would be adversely impacted unless we could raise the prices of our products     in a commensurate manner | 
    
    
      | The existing competitive conditions may not permit     us  to do so, in which case we may suffer increasing losses or reduced     profits | 
    
    
      | We  depend  upon  contract  manufacturers  and any disruption in these     relationships may cause us to fail to meet the demands of our customers and     damage our customer relationships | 
    
    
      | We do not have internal manufacturing capabilities | 
    
    
      | We rely on a small     number of contract manufacturers to manufacture our products in accordance     with our specifications and to fill orders on a timely basis | 
    
    
      | These contract     manufacturers procure material on our behalf and provide comprehensive     manufacturing  services, including assembly, test and control | 
    
    
      | We may not be able to effectively     manage our relationships with these contract manufacturers, they may not     meet  our future requirements for timely delivery and quality, and our     business terms, such as pricing and credit terms, may change in a manner not     favorable to us | 
    
    
      | If we experience changing demand for our products, the     challenges we face in managing our relationships with these manufacturers     will be increased | 
    
    
      | Each of our contract manufacturers also builds products     for other companies, and we cannot be certain that they will always have     sufficient quantities of inventory available to fill orders placed by our     customers, or that they will allocate their internal resources to fill these     orders  on  a timely basis | 
    
    
      | Qualifying a new contract manufacturer and     commencing volume production is expensive and time consuming and could     result in a significant interruption in the supply of our product | 
    
    
      | If we are     required or choose to change one or both of our contract manufacturers, we     could experience a material loss in our revenue and significant damage to     our customer relationships | 
    
    
      | If we fail to accurately predict our manufacturing requirements, we could     incur additional costs or experience manufacturing delays | 
    
    
      | Our contract manufacturers are not obligated to supply products to us for     any specific period, in any specific quantity or at any certain price,     except as may be provided in a particular purchase order | 
    
    
      | We generally     provide forecasts of our demand to these manufacturers up to 12 months prior     to scheduled delivery of product to our customers | 
    
    
      | If we overestimate our     requirements, we may purchase excess inventory, which would consume cash by     increasing our costs and may require us to take additional charges for     excess and obsolete inventory | 
    
    
      | If we underestimate our requirements, we may     have an inadequate amount of inventory, which could result in delays in     delivery to our customers and in recognition of revenue or in increased     costs incurred to expedite product delivery | 
    
    
      | In addition, the lead times for     materials and components we order vary significantly and depend on factors     such as the specific supplier, contract terms and demand for each component     at a given time | 
    
    
      | We also may experience shortages of other components from     time to time, which also could delay the manufacturing of our products and     delay our recognition of revenue | 
    
    
      | In  addition,  we  may  be  subject to regulatory requirements such as     international environmental regulation, which could affect our ability to     manufacture and deliver product on a timely and cost-effective basis | 
    
    
      | For     example,  the  Restriction  of  Hazardous Substances in Electrical and     Electronic Equipment (RoHS) Directive of the European Parliament bans the     use  of  certain materials in new electrical and electronic equipment | 
    
    
      | Any noncompliance with RoHS or other EU requirements would have an adverse     effect   on our  ability  to  pursue European  sales  in  the  future,     and could adversely affect our business and operating results | 
    
    
      | 15     ______________________________________________________________________    [39]Table of Contents       The long and variable sales cycle for our products may cause revenues and     operating results to vary unexpectedly from quarter to quarter, which could     affect the market price of our common stock | 
    
    
      | A  customer’s decision to purchase our products involves a significant     commitment of its resources and a lengthy evaluation, testing and product     qualification process | 
    
    
      | Throughout the sales cycle, we spend considerable time and expense educating     and  providing  information to prospective customers about the use and     features  of our products | 
    
    
      | Even after our customers make a decision to     purchase, we believe that our customers will deploy our products slowly and     deliberately | 
    
    
      | The timing of deployment can vary widely and depends on the     technical features and functionality available in our products, the size of     the network deployment, the complexity of the customer’s network environment     and the degree of hardware and software configuration necessary | 
    
    
      | Customers     with significant or complex networks usually expand their networks in large     increments on a periodic basis | 
    
    
      | Accordingly, we expect to receive purchase     orders on an irregular and unpredictable basis | 
    
    
      | Because of our limited     operating history and the nature of our business, we cannot predict these     sales  and  deployment cycles | 
    
    
      | These long sales cycles, as well as our     expectation that customers will tend to sporadically place large orders with     short  lead  times,  may cause our revenues, cash flows and results of     operations to vary significantly and unexpectedly from quarter to quarter     and the trading price of our common stock could decrease materially | 
    
    
      | Our complex products may have errors or defects or may not interoperate     within the networks of our customers, which could result in reduced demand     for our products or costly litigation against us | 
    
    
      | Our  products are complex and are designed to be deployed in large and     complex networks with large volumes of traffic | 
    
    
      | Accordingly, our products     can  only  be  fully tested when completely deployed in these types of     networks | 
    
    
      | Despite  deployment and internal testing, our customers may     discover errors or defects in the hardware or the software, or the product     may  not operate as expected even after it has been fully deployed | 
    
    
      | In     addition, many of our customers will require that our products be designed     to interface with their existing networks, each of which may have different     specifications and utilize multiple protocol standards | 
    
    
      | Our customers’     networks contain multiple generations of products that have been added over     time  as  these  networks  have  grown  and evolved | 
    
    
      | Our products must     interoperate with many of the products within these networks as well as     future products in order to meet the requirements of our customers | 
    
    
      | Because     our products are critical to the networks of our customers, any significant     interruption in their service as a result of defects in our product or the     failure of our product to interoperate within our customers’ networks could     result in lost profits or damage to these customers | 
    
    
      | These problems could     cause us to incur significant service and warranty costs, divert engineering     personnel from product development efforts and significantly impair our     ability to maintain existing customer relations and attract new customers | 
    
    
      | Although our contracts with our customers generally contain provisions     designed to limit our exposure to potential product liability claims, such     as disclaimers of warranties and limitations on liability for special,     consequential and incidental damages, a court might not enforce a limitation     on our liability, which could expose us to additional financial loss | 
    
    
      | In     addition, a product liability claim, whether successful or not, would likely     be time consuming and expensive to resolve and would divert management time     and attention | 
    
    
      | Further, if we are unable to fix the errors or other problems     that may be identified in full deployment, we would likely experience loss     of  or delay in revenues and loss of market share and our business and     prospects would suffer | 
    
    
      | We have been in business for a short period of time and your basis for     evaluating us is limited | 
    
    
      | We were founded in November 1996, our TSR became commercially available     during the fourth quarter of 1999, our SSR became commercially available     during the fourth quarter of 2001, and our QSR became commercially available     during the fourth quarter of 2002 | 
    
    
      | Accordingly, we have limited meaningful     historical financial data upon which to base projected revenues and planned     operating expenses and upon which investors may evaluate our prospects and     us | 
    
    
      | In addition, our limited operating history means that we have less     insight into how technological and market trends may affect our business | 
    
    
      | The revenue and income potential of our business                                           16     ______________________________________________________________________    [40]Table of Contents       is unproven and the market that we are addressing is rapidly evolving and     competition is intense | 
    
    
      | Our ability to sell our products depends on, among     other things, the level of demand for intelligent high-speed routers, our     ability to address competition, and our ability to meet the needs of our     major customers | 
    
    
      | You should consider our business and prospects in light of     the risks and difficulties frequently encountered by companies like ours in     the early stages of development | 
    
    
      | The unpredictability of our quarterly results of operations may adversely     affect the trading price of our common stock | 
    
    
      | Our quarterly operating results are likely to vary significantly in the     future based on a number of factors related to our industry, the markets for     our products and how we manage our business | 
    
    
      | We have little or no control     over many of these factors and any of these factors could cause the price of     our  common stock to fluctuate significantly | 
    
    
      | In addition to the risks     discussed elsewhere in this section, the following may also adversely affect     the trading price of our common stock:           •   fluctuations in the demand for high-speed routers;           •   the timing and size of customer orders for our products or     cancellations of orders;           •   the timing of product acceptance by customers;           •   the timing and level of research and development and prototype     expenses;           •   the distribution channels through which we sell our products;           •   general economic conditions; and           •   conditions specific to the telecommunications industry, including     uncertainty related to consolidation | 
    
    
      | We plan to selectively invest in research and development and customer     support  capabilities | 
    
    
      | Our operating expenses will largely be based on     anticipated organizational growth and revenue trends and a high percentage     of our expenses are, and will continue to be, fixed in the short term | 
    
    
      | As a     result, if revenue for a particular quarter is below our expectations for     any of the reasons set forth above, or for any other reason, we may not be     able  to  proportionately  reduce operating expenses for that quarter | 
    
    
      | Accordingly, this revenue shortfall would have a disproportionate effect on     our expected operating results and could result in material operating losses     for  that quarter, which could result in significant variations in our     operating results from quarter to quarter | 
    
    
      | Due to the foregoing factors, we believe that quarter-to-quarter comparisons     of  our  operating  results  are  not  a good indication of our future     performance | 
    
    
      | You should not rely on our results or growth for any single     quarter as an indication of our future performance | 
    
    
      | It is likely that in     some future quarters, our operating results may be below the expectations of     public market analysts and investors | 
    
    
      | In this event, the price of our common     stock may decline | 
    
    
      | If  we  do  not  respond  effectively  and  on a timely basis to rapid     technological changes, our products could become obsolete and we would     probably be unable to attract new customers | 
    
    
      | The market for high-speed core router products has been and is likely to     continue  to  be characterized by rapid technological change, evolving     industry standards, and frequent new product introductions | 
    
    
      | The introduction     of new products by competitors, market acceptance of products based on new     or alternative technologies or the emergence of new industry standards could     render our existing or future products obsolete | 
    
    
      | Accordingly, we may be     required to make significant and ongoing investments in future periods in     order to remain competitive | 
    
    
      | The development of new products or technologies     is a complex and uncertain process that requires the accurate anticipation     of technological and market trends | 
    
    
      | We may be unable to respond quickly or     cost-effectively to these developments, and we may not be able to obtain the     necessary funds to develop or acquire new technologies or products needed to     compete | 
    
    
      | We also cannot assure you that any products we do develop will gain     market acceptance | 
    
    
      | 17     ______________________________________________________________________    [41]Table of Contents       In addition, in order to introduce products incorporating new technologies     and new industry standards, we must be able to gain access to the latest     technologies used by our customers, our suppliers and other network vendors | 
    
    
      | Any failure to gain access to the latest technologies could impair our     ability to develop competitive products | 
    
    
      | Cisco’s leadership position in our market could create technical challenges     to our ability to sell our products | 
    
    
      | In  developing  our products, we have made, and will continue to make,     assumptions about the standards that may be adopted by our customers and     competitors | 
    
    
      | If the standards adopted are different from those that we have     chosen  to  support, market acceptance of our products would likely be     significantly reduced and our business will be seriously harmed | 
    
    
      | Because     Cisco maintains a leadership position in selling products that currently     comprise the infrastructure of the Internet, Cisco may have the ability to     establish de facto standards within the industry | 
    
    
      | Any actions by Cisco that     diminish compliance by our products with industry or de facto standards or     the ability of our products to interoperate with other Internet-related     products would be damaging to our reputation and our ability to generate     revenue | 
    
    
      | Customer requirements are likely to evolve, and we will not retain customers     or attract new customers if we do not anticipate and meet specific customer     requirements through our strategy to focus on core functionalities | 
    
    
      | Our future success will also depend upon our ability to develop and manage     key customer relationships in order to introduce a variety of new products     and product enhancements that address the increasingly sophisticated needs     of our target base of customers | 
    
    
      | Our current and prospective customers may     require product features and capabilities that our products do not have | 
    
    
      | We     must  effectively  anticipate  and adapt on a timely basis to customer     requirements and offer products that meet those demands in a timely manner | 
    
    
      | Our strategy is to focus on core product functionalities which we believe     will be common to our target base of core customers | 
    
    
      | Our failure to develop     products that satisfy customer requirements would seriously harm our ability     to  achieve  market  acceptance  for our products | 
    
    
      | In addition, we may     experience design, manufacturing, marketing and other difficulties that     could delay or prevent our development or introduction of new products and     enhancements | 
    
    
      | Material  delays  in introducing new products may cause     customers to forego purchases of our products and purchase those of our     competitors, which could seriously harm our business | 
    
    
      | The introduction of     new or enhanced products also requires that we manage the transition from     older products in order to minimize disruption in customer ordering patterns     and ensure that adequate supplies of new products can be delivered to meet     anticipated  customer demand | 
    
    
      | Our inability to effectively manage this     transition would cause us to lose current and prospective customers | 
    
    
      | Our ability to develop, market and support products depends on retaining our     management team and attracting and retaining highly qualified individuals in     our industry | 
    
    
      | Our future success depends on the continued services of our management team,     which   has  significant  experience  with  the  data  communications,     telecommunications  and  Internet  infrastructure  markets, as well as     relationships with many of the communications service providers and business     partners that we currently or may in the future rely on in implementing our     business plan | 
    
    
      | The loss of the services of our management team or any key     executive could have a significant detrimental effect on our ability to     execute our business strategy | 
    
    
      | Our future success also depends on our continuing ability to selectively     identify, hire as needed, train, assimilate and retain highly qualified     engineering,  managerial,  support and other personnel | 
    
    
      | The demand and     competition for qualified personnel is high, and we have from time to time     experienced,  and  we  expect to continue to experience in the future,     difficulty in hiring and retaining highly skilled employees with appropriate     qualifications | 
    
    
      | In particular, we have experienced difficulty in hiring     qualified engineering personnel | 
    
    
      | The loss of the services of any of our key     employees, the inability to attract or retain qualified personnel in the     future or                                           18     ______________________________________________________________________    [42]Table of Contents       delays in hiring required personnel, particularly engineers, could delay     product development and negatively impact our ability to sell our products | 
    
    
      | We face risks associated with international sales and operations that could     impair our ability to grow our revenues abroad | 
    
    
      | Our international sales have been conducted through a direct sales force,     sales agents, systems integrators, and distributors in Europe, Asia, and     Latin America | 
    
    
      | In January 2004, we established a strategic relationship with     Nortel Networks to market, sell and support our products on a worldwide     basis | 
    
    
      | In 2003, we also established a strategic relationship with Huawei     Technologies to resell our products in Greater China, which expired in 2005,     and also have established regional partners in Europe, Japan, Asia, and     Latin  America | 
    
    
      | These efforts to date have not achieved the results we     anticipated and we do not anticipate the continuation of a comparable level     of  investment  in  support of future international sales channels | 
    
    
      | In     addition, international activities involve additional risks that we do not     have to address in the domestic market, such as difficulties in managing     foreign  operations,  different  regulatory requirements and different     technology standards | 
    
    
      | We expect that international sales will be generally denominated in United     States dollars | 
    
    
      | As a result, increases in the value of the United States     dollar relative to foreign currencies would cause our products to become     less competitive in international markets and could result in limited, if     any, sales and profitability | 
    
    
      | To the extent that we denominate sales in     foreign currencies or incur significant operating expenses denominated in     local currencies, we will be exposed to increased risks of currency exchange     rate fluctuations | 
    
    
      | We may experience difficulty in identifying, acquiring and integrating     acquisition candidates | 
    
    
      | We may supplement our internal growth by acquiring complementary businesses,     technologies or product lines | 
    
    
      | We may not be able to identify and acquire     suitable  candidates  on  reasonable terms | 
    
    
      | We compete for acquisition     candidates with other companies that have substantially greater financial,     management and other resources than we do | 
    
    
      | If we do complete an acquisition,     then we may face numerous business risks | 
    
    
      | These risks include difficulties     in  assimilating  the acquired operations, technologies, personnel and     products,   difficulties  in  managing  geographically  dispersed  and     international operations; difficulties in assimilating diverse financial     reporting and management information systems; the diversion of management’s     attention from other business concerns; the potential disruption of our     business; and the potential loss of key employees, customers, distributors     or suppliers | 
    
    
      | We may finance acquisitions by issuing shares of our common     stock, which could dilute our existing stockholders | 
    
    
      | We may also use cash or     incur additional debt to pay for these acquisitions | 
    
    
      | In addition, we may be     required to expend substantial funds to develop acquired technologies | 
    
    
      | We     may also be required to amortize significant intangible assets in connection     with  future  acquisitions, which could adversely affect our operating     results | 
    
    
      | Our  intellectual property protection may be inadequate to protect our     proprietary rights, and we may be subject to infringement claims that could     subject us to significant liability and divert the time and attention of our     management | 
    
    
      | We regard our products and technology as proprietary | 
    
    
      | We attempt to protect     them through a combination of patent protection, copyrights, trademarks,     trade secret laws, contractual restrictions on disclosure and other methods | 
    
    
      | These methods may not be sufficient to protect our proprietary rights | 
    
    
      | We     presently have 15 patents granted in the United States and over 50 United     States and foreign patent applications pending | 
    
    
      | We cannot be certain that     patents will be granted based on these or any other applications, or that,     even if issued, the patents will adequately protect our technology | 
    
    
      | We also     generally  enter  into  confidentiality agreements with our employees,     consultants and customers, and generally control access to and distribution     of  our documentation and other proprietary information | 
    
    
      | Despite these     precautions, it may be possible for a third party to copy or otherwise     misappropriate and use our products or technology without authorization,     particularly  in  foreign countries where the laws may not protect our     proprietary rights to the same extent as do the laws of the United States,     or to develop similar technology independently | 
    
    
      | We may need to resort to     litigation in the future to enforce our                                           19     ______________________________________________________________________    [43]Table of Contents       intellectual property rights, to protect our trade secrets or to determine     the validity and scope of the proprietary rights of others | 
    
    
      | This litigation     could result in substantial costs and diversion of resources and could harm     our business | 
    
    
      | We also license technologies from third parties, some of which we license     without indemnification from the licensor for infringement of third party     intellectual property rights | 
    
    
      | We are continuing to develop and acquire     additional intellectual property | 
    
    
      | Although we have not been involved in any     litigation relating to our intellectual property, including intellectual     property that we license from third parties, we expect that participants in     our markets will be increasingly subject to infringement claims | 
    
    
      | Third     parties may try to claim our products infringe their intellectual property | 
    
    
      | Any claim, whether meritorious or not, could be time consuming, result in     costly litigation and/or require us to enter into royalty or licensing     agreements | 
    
    
      | Although we carry general liability insurance, our insurance may     not cover potential claims of this type or may not be adequate to indemnify     us  for all liability that may be imposed | 
    
    
      | In addition, any royalty or     licensing agreements might not be available on terms acceptable to us or at     all, in which case we would have to cease selling, incorporating or using     the products that incorporate the challenged intellectual property and     expend substantial amounts of resources to redesign our products | 
    
    
      | If we are     forced to enter into unacceptable royalty or licensing agreements or to     redesign our products, our business and prospects would suffer | 
    
    
      | We are uncertain of our ability to obtain additional financing for our     future capital needs | 
    
    
      | We expect our current cash, cash equivalents and marketable securities will     meet our normal working capital and capital expenditure needs for at least     the next twelve months | 
    
    
      | We may need to raise additional funding at that time     or  earlier  if we decide to undertake more rapid expansion, including     acquisitions of complementary products or technologies, or if we increase     our  research  and development or other efforts in order to respond to     competitive pressures | 
    
    
      | We cannot be certain that we will be able to obtain     additional financing on favorable terms, if at all | 
    
    
      | We may obtain additional     financing by issuing shares of our common stock, which could dilute our     existing stockholders | 
    
    
      | If we cannot raise needed funds on acceptable terms,     or at all, we may not be able to develop or enhance our products or respond     appropriately to competitive pressures, which would seriously harm our     business | 
    
    
      | The market price of our common stock may be materially adversely affected by     market volatility | 
    
    
      | The price at which our common stock trades is highly volatile and fluctuates     substantially | 
    
    
      | Given the limited volume of our product sales and our limited     number  of  customers,  the  announcement  of any significant customer     developments,  awards  or losses or of any significant partnerships or     acquisitions by us or our competitors could have a material adverse effect     on  our stock price | 
    
    
      | In addition, the stock market in general has, and     technology companies in particular have, from time to time experienced     extreme price and volume fluctuations that have often been unrelated or     disproportionate  to  the  operating  performance or prospects of such     companies | 
    
    
      | In the past, securities class action litigation has often been brought     against companies following periods of volatility in the market price of     their securities | 
    
    
      | Those companies, like us, that are involved in rapidly     changing  technology  markets  are  particularly subject to this risk | 
    
    
      | Securities class action lawsuits have been filed against us in the United     States  District  Court  for  the  Southern  District of New York | 
    
    
      | The     consolidated amended complaint generally alleges that our offering documents     failed to disclose certain underwriting fees and commissions and underwriter     tie-ins and other arrangements with certain customers of the underwriters     that  impacted  the price of our common stock in the after-market | 
    
    
      | The     plaintiffs are seeking unspecified damages | 
    
    
      | We believe that the claims in     this  case  against us lack merit, and we have defended the litigation     vigorously | 
    
    
      | We can provide no assurance as to the outcome of this securities litigation | 
    
    
      | Any conclusion of this litigation in a manner adverse to us could have a     material adverse effect on our business, financial condition, results of     operations and cash flows | 
    
    
      | In addition, the cost to us of defending the     litigation,  even if resolved in our favor, could be substantial | 
    
    
      | Such     litigation could also substantially divert the attention of our management     and our resources in general | 
    
    
      | Uncertainties resulting from the initiation     and continuation of this litigation could harm our                                           20     ______________________________________________________________________    [44]Table of Contents       ability to compete in the marketplace | 
    
    
      | Because the price of our common stock     has been, and may continue to be, volatile, we can provide no assurance that     additional securities litigation will not be filed against us in the future | 
    
    
      | The market price of our common stock might decline due to future non-cash     charges to earnings | 
    
    
      | In December 2004, the Financial Accounting Standards Board issued SFAS     Nodtta 123R, “Share Based Payment | 
    
    
      | ” SFAS 123R requires all share-based payments     to employees, including grants of employee stock options, to be recognized     in the financial statements based on their fair values | 
    
    
      | Avici will adopt     this statement in the first quarter of 2006 | 
    
    
      | The adoption of this statement     is expected to have a material impact on its future earnings | 
    
    
      | It may not be     possible to calculate the future impact with respect to stock-based grants     as the amount of these charges to earnings fluctuates with the price of our     common stock and other factors | 
    
    
      | It is possible that some investors might     consider this impact on operating results to be material, which could result     in a decline in the price of our common stock | 
    
    
      | In addition, since 2000 we     amortized against revenue, non-cash charges relating to the issuance of     common stock warrants to a customer | 
    
    
      | In January 2004, in connection with a     three-year strategic OEM agreement with Nortel Networks we issued a warrant     to purchase shares of Avici common stock | 
    
    
      | The fair value of the warrant was     calculated  to  be  approximately dlra6dtta3 million using the Black-Scholes     valuation  model, and is being recorded as a reduction of revenue on a     systematic basis over the economic life of the OEM agreement, which is     expected to be three years | 
    
    
      | Our estimates and judgments related to critical accounting policies could be     inaccurate | 
    
    
      | We consider accounting policies related to revenue recognition, cost of     revenue – service, inventory valuation, warranty liabilities and long lived     assets to be critical in fully understanding and evaluating our financial     results | 
    
    
      | Management makes certain significant accounting judgments and     estimates related to these policies | 
    
    
      | Our business, operating results and     financial condition could be materially and adversely impacted in future     periods if our accounting judgments and estimates related to these critical     accounting policies prove to be inadequate | 
    
    
      | Any  failure  to maintain effective internal information systems or to     implement  effective  internal controls over financial reporting could     adversely impact our business | 
    
    
      | We must continue to maintain our internal information systems in order to     manage our business operations | 
    
    
      | We must also maintain internal controls over     financial  reporting in accordance with The Sarbanes-Oxley Act of 2002     (“Sarbanes-Oxley”) | 
    
    
      | Our disclosure controls and procedures and internal     controls over financial reporting may not prevent all errors and intentional     misrepresentations | 
    
    
      | Any  system  of internal control can only provide     reasonable  assurance that all control objectives are met | 
    
    
      | Some of the     potential risks involved could include but are not limited to management     judgments, simple errors or mistakes, willful misconduct regarding controls     or misinterpretation | 
    
    
      | There is no guarantee that existing controls will     prevent or detect all material issues or that existing controls will be     effective in future conditions, which could materially and adversely impact     our financial results | 
    
    
      | Under Sarbanes-Oxley, we are required to evaluate and     determine  the  effectiveness  of our internal controls over financial     reporting | 
    
    
      | Compliance with this legislation will require management’s     attention and resources and will cause us to continue to incur significant     expense | 
    
    
      | Management’s assessment of our internal controls over financial     reporting may identify weaknesses that need to be addressed in our internal     controls over financial reporting or other matters that may raise concerns     for investors | 
    
    
      | Should we determine that we have material weaknesses in our     internal controls over financial reporting, our results of operations or     financial condition may be materially adversely affected or the price of our     common stock may decline | 
    
    
      | Our charter documents, Shareholder Rights Plan, and Delaware law could     inhibit a takeover that some stockholders may consider favorable | 
    
    
      | There  are  provisions  of  Delaware law and our charter, by-laws, and     Shareholder Rights Plan that could make it more difficult for a third party     to  acquire  us,  even  if doing so would be beneficial to some of our     stockholders by providing them the opportunity to sell their shares at a     premium  over  the  market  price | 
    
    
      | If a change of control or change in     management is delayed or prevented, the market price of our common stock     could be affected |