IBM Nways 8260 Manual page 33

1.3.3.2 8260 Fault-Tolerant Controller module
The 8260 Fault-Tolerant Controller Module synchronizes the operations of all
installed media and management modules by providing clocking and timing to
the 8260 Multiprotocol Intelligent Hub Backplane. The Controller module is also
responsible for managing the power and cooling subsystems.
1.3.3.3 Ethernet Media Access Daughter Card (E-MAC)
The E-MAC daughter card allows you to gather statistics for the network to which
it is attached. It can be physically mounted to either an 8260 Ethernet media
module or the 8260 EC-DMM.
1.3.3.4 8260 Token-Ring Media Access Daughter Card (T-MAC)
The T-MAC daughter card allows you to gather statistics for the network to which
it is assigned. It can be mounted on any 8260 token-ring media module.
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Chapter 1. An Overview of the IBM 8260 Hub