IBM SG24-4817-00 - Manual (Page 92)

This soft copy for use by IBM employees only.
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
Switch Module 5312 28 12 4 4 4
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.
• 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.
• 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.
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ATM Workgroup Solutions: Implementing the 8285 ATM Switch