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This soft copy for use by IBM employees only.
4.3 ATM 12-Port 25 Mbps UTP Concentrator Module
The ATM 25 Mbps UTP Concentrator Module is a single-slot concentrator module
that provides low-cost access to a high-performance ATM network. It is ideal for
upgrading your legacy LAN users and for providing higher performance to new
users.
It has the following characteristics:
•
12 Forum-Compliant ATM 25.6 RJ-45 ports capable of supporting shielded
and unshielded twisted pair cabling.
•
Supports user-to-switch, server-to-switch, and switch-to-switch connections in
any combination.
•
Supports ATM Forum Available Bit Rate (ABR) Service using Explicit Forward
Congestion Control (EFCI) marking.
•
Has a large 8,000 cell buffer to smooth bursts of traffic without triggering
congestion control mechanisms.
•
Supports UNI 3.0, UNI 3.1, and UNI translation.
•
Expands IBM 8285 Nways ATM Workgroup Switch capacity up to 48 ports
with optional 8285 Expansion Chassis (FC# 5502).
4.3.1 Sample Scenarios
The ATM 12-Port 25 Mbps UTP Concentrator Module is a high-performance card
that is very cost-effective for connecting high-bandwidth users and servers into a
workgroup or an ATM network. In addition, it can be used to provide redundant
links to a backbone or server to provide higher bandwidth and improved
reliability. Figure 12 on page 39, Figure 14 on page 41, and Figure 13 on
page 40 show some ways the ATM 12-Port 25 Mbps UTP Concentrator Module
can be used with the 8285 switch.
38 ATM Workgroup Solutions: Implementing the 8285 ATM Switch