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This soft copy for use by IBM employees only.
Figure 16. ATM 3-Port 155 Mbps LAN Concentration Module with Redundant Backbone
Links
Figure 16 shows how you can use the ATM 3-Port 155 Mbps LAN Concentration
Module to connect a high-performance workgroup into the backbone network to
access additional high-speed resources. In this case, up to eight users, using
workstations with high-performance ATM 155 Mbps adapters, such as the IBM
Turboways ATM 155 Mbps Adapter, are connected in to ATM 3-Port 155 Mbps
LAN Concentration Modules installed in the 8285 Expansion Chassis. This
enables each user to access resources across the ATM backbone network. By
providing redundant backbone links, preferably to separate backbone switches,
the ATM 3-Port 155 Mbps LAN Concentration Module also provides aggregate
backbone access bandwidth as high as 310 Mbps and ensures availability to the
workgroup should one of the links fail. Up to 12 ATM25 users can also take
advantage of this increased bandwidth and availability.
Whether as a workgroup solution or as a backbone solution, the ATM 2-Port 155
Mbps Flexible Media Module and the ATM 3-Port 155 Mbps LAN Concentration
Module meet the needs of bandwidth-intensive applications, with the ATM 3-Port
155 Mbps LAN Concentration Module offering more ports, a lower price/port, and
additional buffering to handle bursty traffic.
Chapter 4. IBM 8285 ATM Modules 45