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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.
76 ATM Workgroup Solutions: Implementing the 8285 ATM Switch