By Edwin R Coover
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Extra resources for ATM switches
Bay and Newbridge used proprietary LANE software, and Newbridge offered prestandard MPOA. Cisco’s catalyst 5000-Lightstream 1010 combination and 3Com’s Cellplex 7000 emerged as the top performers . 2 MAKING A CONNECTION As noted earlier, making an ATM connection is analogous to making a telephone call. The switching resources have to be in place (signified by a dial tone). The circuit resources have to be in place (signified by the ring- The Technical Challenges of High-Speed Switching I 29 ing).
Third, as noted earlier, providing higher performance LAN services has been the raison d’être of the early ATM switches. With multitudes connected to Ethernet or token ring LANs, congestion at servers or network gateways often becomes severe. ” These feature Ethernet or token ring work group LANs, often with local servers, that are then attached to departmental LANs for communications between departments, whether local or distant. Oftentimes the higher level LANs, reflecting the volumes of pooled traffic, use faster media, such as 16 Mbps token ring or fiber/copper distributed data interface (F/CDDI).
Single bit errors can be corrected if required. • AAL 2: Neither the ITU-T nor ATM Forum have defined the specific format of AAL’s segmentation and reassembly (SAR) protocol data unit (PDU). The best prognostication is that AAL 2, if eventually specified, will be similar to AAL 1 and will include sequence checks and will detect/correct single bit errors. • AAL 3/4: AAL 3/4 adds a 2-octet SAR header (which contains a sequence number) to each block. This allows it to identify misinserted or lost packets.
ATM switches by Edwin R Coover