IBM SG24-4817-00 - Manual (Page 58)

This soft copy for use by IBM employees only.
4.4 ATM 2-Port 155 Mbps Flexible Media Module and ATM 3-Port 155 Mbps
LAN Concentration Module
The ATM 2-Port 155 Mbps Flexible Media Module and the ATM 3-Port 155 Mbps
LAN Concentration Module are single-slot concentrator modules that are ideal
for high-speed connections to both local resources and to devices up to 20 Km
away. They have the following characteristics in common:
• Provide two or three ports, each capable of supporting a 155 Mbps
(full-duplex) connection to either a user, a server, or another switch. The
traffic received from these ports will be multiplexed into the backplane
connection between the ATM 155 Mbps Media Module and the
switch-on-a-chip.
Each port can support any of the following I/O cards:
• Support either SONET STS-3C or SDH STM-1 on any port at speeds of
155.520 Mbps.
STS-3c Limitations
The STS-3c implementation is a Lite implementation, which, although fully
compliant with ATM Forum standards, is lacking some of the
management and overhead portions of a full SONET implementation. It
will interoperate with the 1-port OC3 I/O card (SMF) and the 1-port OC3
I/O card (MMF) that are installed in an ATM WAN Module. However,
neither the 1-port ATM 155 Mbps Single-mode Fiber I/O card nor the
1-port ATM 155 Mbps UTP/STP I/O card (RJ-45) are suitable for direct
connection to a public bearer service other than dark fiber. In addition,
there may be incompatibilities with certain adapters that expect a full
SONET implementation.
STM-1 Limitations
The STM-1 implementation is a Lite implementation, lacking some of the
management and overhead portions of a full SDH implementation. It will
interoperate with the 1-port STM1 I/O card (SMF) and the 1-port STM1 I/O
card (MMF) that are installed in an ATM WAN Module. However, neither
the 1-port ATM 155 Mbps Single-mode Fiber I/O card nor the 1-port ATM
155 Mbps UTP/STP I/O card (RJ-45) are suitable for direct connection to a
public bearer service. In addition, there may be incompatibilities with
certain adapters that expect a full SDH implementation.
Please refer to Asynchronous Transfer Mode (ATM): Technical Overview for
more information on the SONET and SDH standards.
• Hot-pluggable in any slot in the 8285 Expansion Chassis.
• Support UNI, SSI, and NNI on either port in any combination.
Table 3. ATM 155 Mbps Media M o d u l e Supported I/O Cards
Feature Part Number Interface Cable
8800 58G9667 SC Multi-Mode Fiber
8801 58G9855 SC Single-Mode Fiber
8802 58G9856 RJ-45 UTP5/STP
8803 58G9857 DB9 STP
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ATM Workgroup Solutions: Implementing the 8285 ATM Switch