Figure 15: M120 CB
•
CB Components
Each CB consists of the following components:
•
Switch fabric—Provides transit traffic through the Control Board.
•
Control FPGA—Provides the PCI interface to the Routing Engine.
•
1000Base-T Ethernet controller—Provides a 1-Gbps Ethernet link between the Routing
Engines.
•
Ethernet switch—Provides Ethernet connectivity between the Routing Engine and the
FPCs and FEBs; link speeds are 10 Gbps to the Routing Engine and FEBs and 100 Mpbs
to the FPCs and CFPCs.
•
SONET clocking module—Provides a Stratum 3 timing reference for all SONET
interfaces installed in the system.
•
LEDs—Three LEDs on the CB indicate the status of the CB and whether that CB is
master. The LEDs, labeled
OK
,
FAIL
, and
MSTR
are located directly on the control board.
•
Circuits for chassis management and control.
•
Power circuits for the Routing Engine and CB.
•
Offline button—Takes the CB offline when pressed.
Related
Documentation
M120 Control Board (CB) LEDs on page 48
•
•
Maintaining the M120 Host Subsystem on page 266
•
Replacing an M120 CB on page 202
M120 Control Board (CB) LEDs
describes the functions of the Control Board LEDs.
Copyright © 2018, Juniper Networks, Inc.
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M120 Multiservice Edge Router Hardware Guide
Summary of Contents for M120
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