DUA1800-0AAA04
The Chassis 1-5

The Backplane

The backplane provides the following services to the MSH:
■Ethernet support via a medium speed CSMA/CD bus
■Token ring support via a flexible high speed bus
■FDDI support via a flexible high-speed bus (3C18001 or converted
3C18000)
■Management via a separate management bus
■Power
■System control
Ethernet Support
The Ethernet bus has been designed to conform to the IEEE 802.3
standard for Local Area Networks. It supports three individual
paths which are tracked to all module slots. You can decide to
which Ethernet bus a module connects thus allowing multiple
segments within the one chassis..
Figure 1-2 Ethernet backplane operation
Figure 1-2 shows an ECS module fitted with a converter
connecting into Bus E1 on the MSH Backplane, and MSH modules
connecting to any of the three ethernet buses.
Bus 1
Bus 2
Bus 3
MSH modules
ECS module
with adap
p
ter
Chassis.bk : CHAPTER1 Page 5 Monday, February 10, 1997 1:11 PM