Juniper MX2010, Hardware Manual

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NOTE: All switch fabric boards in the chassis must be the same type. Mixed mode is not
supported.
Switch Control Boards
Switch Control Boards (MX-SCB, MX-SCBE, MX-SCBE2, and MX-SCBE3) provide full line-rate performance
and redundancy without a loss of bandwidth. MX-series SCBs feature an integrated switch fabric that
connects to all slots in the chassis in a nonblocking architecture. The SCBs house the routing engine, control
power to MPCs, monitor and control system functions such as fan speed and the system front panel, and
manage clocking, resets, and boots. The SCB is a single-slot card and has a carrier for the routing engine
on the front.
SCBs install vertically in the MX2020, MX2010, and MX960 chassis, and horizontally in the MX480 and
MX240 chassis. The number of supported SBCs varies per router:
•
MX240 and MX480 routers— 2 SCBs for 1 + 1 MX SCB redundancy when used with the DPC line cards
•
MX960 router— 3 SCBs for 2 + 1 redundancy when used with the DPC line cards
•
MX2010 and MX2020 routers— 8 SCBs
MX2000 ADC
The MX2000 ADC is a special line card adapter (ADC) that enables MX2010 and MX2020 routers to use
smaller form-factor MPCs (MPC1E, MPC2E, and MPC3E). The ADC is merely a shell that accepts line cards
in the front and converts power and switch fabric in the rear. ADCs install vertically in the MPC slot on
the front of the router. For more information about the MX2000 ADC, see “MX2000 Adapter Card (ADC)
Description” on page 69 .
Routing Engines and CB-REs
Routing engines and Control Boards with Routing Engines (CB-REs) provide the software processes that
run Junos OS. The routing engine maintains the routing tables, manages the routing protocols used on the
router, controls the router interfaces, controls some chassis components, and provides the interface for
system management and user access to the router. Each CB-RE is a combined Routing Engine and Switch
Control Board in one unit.
RELATED DOCUMENTATION
MX Series Router Architecture | 6
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