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January 24, 1989


By CBR Staff Writer

Cabletron Systems Inc has added another two bridges, the NB20E and the NB25E, to its range of Ethernet products. The Rochester, New Hampshire company claims that the two-port bridges provide interconnection between IEEE 802.3 Ethernet local area networks implemented using various media, and that they enable users to connect two or more Ethernet segments to create extended-distance local nets. The MAC-level bridges – which, says the company, incorporate the Spanning Tree Algorithm – can use XNS, TCP, LAT or DECnet protocols that run on Ethernetworks; it claims the selectable root switch enables users to preselect the primary data path and reroute traffic without the need physically to relocate bridges. Cabletron says that using a software hashing algorithm, the NB20E can process data at up to 8,700 packets per second, has a forwarding rate of 5,800 packets per second, and is able to store 2,000 nodes in the bridge’s address table; the higher-end NB25E uses a hardware filter to process data at up to 15,000 packets per second with a forwarding rate of 10,000 packets per second, and a storage capacity of 8,000 addresses. The NB20E is priced at $3,000, the NB25E at $6,500; they will be available for shipment in the middle of February.

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