IBM SG24-4817-00 manual Front Panel, ATM Backplane, ATM Planar

This soft copy for use by IBM employees only.

2.3.1 Internal Features

The IBM 8285 Expansion Chassis has two primary internal features.

2.3.1.1 ATM Backplane

The IBM 8285 Expansion Chassis contains an ATM backplane that is effectively a three-slot version of the 8260 hub′s ATM backplane. That is to say, it is a completely passive backplane with female connectors. It is capable of supporting most 8260 hub ATM modules.

Note

However, there are some differences between the ATM backplanes of the IBM 8285 and IBM 8260. Specifically, the IBM 8260 ATM Control Point and Switch Module cannot be used in the IBM 8285 Expansion Chassis. For more information, refer to Chapter 3, ªFunctional Overview of the IBM 8285º on page 17.

2.3.1.2 ATM Planar

The IBM 8285 Expansion Chassis contains a planar which has a switch-on-a-chip switching module. When connected to the IBM 8285 Base Unit with the expansion interface cable, the switch-on-a-chip performs all the port-to-port cell switching:

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Between ports in the IBM 8285 Base Unit

Between ports in the IBM 8285 Base Unit and ATM modules in the IBM 8285 Expansion Chassis

•Between ports on ATM modules in the IBM 8285 Expansion Chassis

2.3.2 Front Panel

Figure 6 shows the front panel of the IBM 8285 expansion unit.

Figure 6. Front Panel of the IBM 8285 Nways ATM Workgroup Switch Expansion Unit

14ATM Workgroup Solutions: Implementing the 8285 ATM Switch