1.2 8260 Hardware Description
There are three models of the 8260:
•8260-017
•8260-010
•8260-17A
1.2.1 IBM 8260 Model 017
The 8260 Model 017 is a 17-slot module which allows you to install any
combination of 8260 and 8250 modules (except the 8250 Controller module) to set
up token-ring, Ethernet and/or FDDI networks. Additionally, it can be upgraded
with the ATM backplane to allow you to set up an ATM network.
The 8260 Model 017 chassis is made up of 5 main areas:
•The backplane
•The payload area
•The Controller module slots
•The intelligent power subsystem
•The intelligent cooling subsystem
Figure 1 on page 4 provides a view of an 8260 multiprotocol intelligent switching
hub with both 8250 and 8260 modules installed.

1.2.1.1 8260 Backplane

The 8260 Model 017 has two standard backplane buses which are used to
provide you with the ability to configure token-ring, Ethernet, and/or FDDI
network segments. These two backplane buses are:
•Enhanced TriChannel - Allows you to configure the following:
−Three Ethernet segments or
−Up to 7 token-ring segments or
−Up to 4 FDDI segments
You may also have a mixture of segments using different protocols. In that
case, the maximum number of permitted segments will depend on the
configuration of your hub.
•ShuntBus - Allows you to configure the following:
−Two Ethernet segments and
−10 token-ring segments (or 4 FDDI segments)
The Enhanced TriChannel and the ShuntBus are fully described in Chapter 2,
“Backplane Architecture” on page 13.
Chapter 1. An Overview of the IBM 8260 Hub 3