The Design And Development Of The Broadband Access Server - Lan Access Module Packet-switched Functional Design Of The Asic

With the rapid dcve1o[>111c1>t of Con213t)1c1. (.\)171l11u11 1cation. 1ntc1'13ct technology, and the rapid growth ofll'u Itillledia aPpl icatiol1 on I ]1tcl'nct, thc l,Lll,Ll\\ l(II 11 of l11tcrnet backbo11c is growing vet'}' quIckly. Duc to thcuti1izatjon of broadband acccss 1cchnolo21c5 i1s l ..\N. xl )SL. HFC. 1 .M OS, the net\vo1-k bott[encck al thc useI'access network wilI to be scttlcd. But 111c LIsct I11al1agcl11ent and cl1aIge problel11 on thc broadband. acccssenvironment should be wel1 seI11cd, othc[x' i>c. 111c dcvclopment of broildband access net\vork wi1l be affected.That IS the reason why we devc1op the Br()udbi111d Nct\\'ork Access Scl'ver (BNAS ). As a new style nct''orkaccess gateway, BNAS lics on thc boI'dct ()1- nctworlt backbone, It handles 1he connection Tequcst ofbroadband access users, autI1cnticating. author1/ing. accounting the b]'oildband acccss uscrs and manages their' other profiles. It can a1so provide VPN ser\'icc to its uscI's. Furtherrnorc, the BNAS can I3rovide a11 services thatthe traditionaI network acccss server can do, so the teIccom carrier or Internet access service provider maydevelop their service.to broadband access sca111lcsstyOne of the most important fcatures of BNAS is its \\ire-speed packct forwarding ability that is suitabIe toits "Broadband" POrt. During this 5ystem dcsign, 'vc adopt the mainstrean1 AS1C techl1lque.This dissertation is mainly discussing thc BNAS system design and the packet fonvarding moduIe'sfunctiona1 design thoroughly ln the part of sVstcl11 desig17, we discussed the design goal of system function andperformance, and the way and aIgorithm \'c adoPled ft>r these goal. Y\c also discussed the key technology insystem design and systen1's tcstabIe funclio11 dcslgn ll1 ll1is section. ln tl1e part of packet fOtwarding modu1e'sfunctional design, we main]y discussed the impIe111entation of systen1 tbnction s defined in the system designiection. We also describes thc data structurc dcfil1ltion Llscd in ASIC design, the way of systen1 NM and chargcfunction implernentation,the \vay of systc111 tcst fL111ctio11ill interface dcsig11, etc.At last, this dissertation dIscusses thc I3\AS systcI11's typical application and thc current situation of ourBNAS product. We then discusscd the kno\\ 11 [1lobIe111 It1 system design ul1d their possible soIutions. The BNASsystem's evoI ution are aIso d iscussed in th ] s .1 issel-ti1tioI1.