IBM SG24-4817-00 manual ATM UFC I/O Feature

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Table 9 (Page 2 of 2).	A Comparison of 8285 Ethernet LAN Switch Modules
Module		Feature		Maximum Number of Ports
			10Base-T	10Base-F	100BaseT	100BaseF	ATM 155
3-slot 8271 ATM/LAN		5312	28	12	4	4	4
Switch Module

4.9.1.1 ATM UFC I/O Feature

There are 2 ATM UFCs available, one ATM 1-port UFC for the Ethernet LAN switches and one ATM 1-port UFC for the token-ring LAN switches.

ATM 155 Mbps UFC: The ATM Multimode Fiber UFC achieves the ATM-to-LAN connection by providing an ATM Forum-compliant LAN emulation proxy client (LEC). It features the following:

•Supports a single ATM 155 Mbps multimode fiber interface with SC connectors.

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Supports SONET STS-3c framing.

Supports both UNI 3.0 and UNI 3.1 in accordance with ATM Forum specifications.

•Supports switched virtual connections (SVCs) only and does not support permanent virtual connections (PVCs).

•Supports best effort (Unspecified QoS), variable bit rate (VBR), and continuous bit rate (CBR) connections in accordance with ATM Adaptation Layer 5 (AAL-5) specifications.

•Supports up to 3072 virtual channel connections (VCCs), requiring one VCC for each unique source/destination LEC pair.

•Supports up to eight emulated LANs (ELANs), each represented by a logical emulated LAN port (ELP), all sharing the same physical link to the ATM network. However, it is not possible to have two ELPs assigned to the same ELAN on a single ATM UFC.

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Does not support the VPI field of the virtual path/channel identifier.

Supports up to eight LECs which are compatible with LES/LECS Version 1.0 implementations. Each LEC can be pre-configured with the address of its required LAN Emulation Server (LES) or can discover the address of its LES dynamically via communication with a LAN Emulation Configuration Server (LECS).

•Supports full media-speed throughput in both directions on its full-duplex ATM connection, assembling or disassembling an aggregate of approximately 177 Kbps (thousand 64-byte frames per second).

•Supports the following management interfaces:

−LEC MIB (ATM Forum LEC Management Specification Version 1.0)

−AToM MIB (RFC 1695)

−Interface group of MIB-II (RFC 1213 and 1573), enhanced to include ATM

The switch′s SNMP agent is accessible though any of the Ethernet or token-ring LAN ports. When the LAN switch is configured with an ATM UFC, the switch′s SNMP agent is also accessible via an emulated LAN connection across an ATM port.

76ATM Workgroup Solutions: Implementing the 8285 ATM Switch