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36
C
3: C
B
HAPTER
ORE
UILDER
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 con-
nectivity to the System Management Compo-
nent (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
9000 E
S
16-S
NTERPRISE
WITCH
LOT
C
HASSIS
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.
Hardware Components
This section describes the following chassis
components:
Power Supplies
820-watt AC
–48-volt DC
Fan Trays
Modules
Power Supplies
The CoreBuilder 9000 16-slot chassis can contain four
front-loading, 820-watt, modular AC power supplies
(Model Number 3CB9EP8) or four –48-volt DC power
supplies (Model Number 3CB9EP8D). The power
supplies provide power to the management modules,
switch fabric modules, interface modules, fans, and
backplane.
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