Switch Control Board Components And Descriptions; Mx-Series Switch Control Board (Scb) Description - Juniper MX960 Hardware Manual

CHAPTER 8

Switch Control Board Components and Descriptions

IN THIS CHAPTER

MX-Series Switch Control Board (SCB) Description | 145

SCBE3-MX Description | 149
SCBE2-MX Description | 157
SCBE-MX Description | 164
SCB-MX Description | 168
MX-Series Switch Control Board (SCB) Description
At the heart of the MX Series 5G Universal Routing Platform is the Switch and Control Board (SCB). The
SCB is a single-slot card and has a carrier for the routing engine in the front. It has three primary functions:
switch data between the line cards, control the chassis, and house the routing engine.
The MX-Series SCB:
Controls power to MPCs
Manages clocking, resets and boots
Monitors and controls systems functions, such as the fan speed, Power Distribution Module (PDM)
status, and the system front panel.
The switch fabric is Integrated into the SCB, interconnecting all the DPCs and MPCs within the chassis
and supporting up to 48 Packet Forwarding Engines. The routing engine installs directly into the SCB.
The number of SCBs supported varies, depending on the MX chassis and the level of redundancy. The
MX240 and MX480 require two SCBs for 1+1 redundancy, whereas the MX960 requires three SCBs for
2+1 redundancy.
There are four generations of SCBs for the MX Series 5G Universal Routing Platform: SCB-MX, SCBE-MX,
SCBE2-MX, and SCBE3-MX.
145