3Com 3CB9E7 - CoreBuilder 9000 Chassis Switch, Getting Started Manual

Page: 26 / 132

26 C
HAPTER
2: C
ORE
B
UILDER
9000 E
NTERPRISE
S
WITCH
8-S
LOT
C
HASSIS
modules, providing five primary and five redundant
high-speed links for each interface module.
The backplane:
■
Supports two slots for switch fabric modules.
■
Supports automatic configuration detection.
■
Provides central clock distribution.
Backplane Connector Architecture
The backplane connector provides easy access to all
the services from the CoreBuilder 9000, including two
10-Mbps MLAN (Management LAN) channels, one
UART channel, a number of system clocks, and the
SCI (Serial Communication Interface) communications
channel.
The backplane connector consists of the:
■
Common signals bus — The common signals bus
consists of all the signals that are used for
system-wide functions. These include power
supply monitoring and control, backplane reset,
system clock signals, and an LED test signal.
■
Power delivery — The power delivery connector
provides the following voltage: +2V, +3.5V, +5V,
+12V, -5V, and -12V.
■
System communications channels — The
management system uses two types of busses to
communicate with other modules in the Switch:
■
Serial Communication Interface (SCI) — The
SCI bus serves as a communications path
between management modules.
■
Management LANs — The MLANs are
high-speed management busses that provide
intermodule communication and network
connectivity to the System Management
Component (SMC). Each MLAN runs at
10 Mbps.
A power management channel informs the Switch of
the power requirements for all modules. If the EME
determines that there is not enough power in the
Switch for that module, then the module does not
power on.
The connector in the slots for the switch fabric
modules is a 948-pin version of the internetworking
connector. This connector supports connections up to
70 high-speed, full-duplex, serial links on the
backplane and all the other chassis services that are
available to the switch fabric modules.
Interface modules and switch fabric modules access
Switch services through connectors to the backplane.