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PM73121 Datasheet(PDF) 27 Page - PMC-Sierra, Inc |
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PM73121 Datasheet(HTML) 27 Page - PMC-Sierra, Inc |
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27 / 223 page  PM73121 AAL1gator II PMC-Sierra, Inc. PMC-980620 ,VVXH AAL1 SAR Processor Data Sheet QSPQSD@U6S`Ã6I9Ã8PIAD9@IUD6GÃUPÃQH8TD@SS6ÃDI8Ã6I9ÃAPSÃDUTÃ8VTUPH@ST¶ÃDIU@SI6GÃVT@ 1 SYSTEM APPLICATIONS An essential function for ATM switches is to emulate existing Time Division Multiplexing (TDM) circuits. Since most voice and data services are currently provided by TDM circuits, seamless interworking between TDM and ATM has become a system requirement. The ATM Forum has standardized an internetworking function that satisfies this requirement in the Circuit Emulation Service (CES) Specification. The AAL1gator II is a direct implementation of that ser- vice specification in silicon, including the complex N × 64 channelized service and support of CAS. 1.1 Replacing a TDM Digital Access Cross-connect System (DACS) with an ATM System In one public network application, a TDM DACS is replaced with an ATM system containing an AAL1gator II. When the backbone trunk of a network is changed from TDM to ATM, the TDM DACSs will probably be converted from TDM to ATM. The existing leased line services pro- vided by the DACSs must then be provisioned with the ATM DACS. In this manner, TDM, frame relay, and ATM circuits can be provided in a single network, as shown in Figure 4. Figure 4. Using the AAL1gator II as Part of a TDM DACS Replacement Fractional T1 Service TDM DACS Fractional T1 Service Circuit Emulation Card AAL1gator II (PM73121) ATM DACS TDM Backbone ATM Backbone T1 Service Digital Data Service T1 Service DDS Service |
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