Juniper M40E Hardware Manual page 60

M40e Multiservice Edge Router Hardware Guide
32
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Each MCS (shown in Figure 18 on page 31) has the following components:
PCI interface—Connects the MCS to the Routing Engine.
100-Mbps Ethernet switch—Carries signals and monitoring data between router
components.
19.44-MHz stratum 3 reference clock—Generates clock signal for SONET/SDH PICs.
2
I C controller—Monitors the status of router components.
Three LEDs—Indicate MCS status. There is a blue one labeled
labeled OK , and an yellow one labeled
the LED states.
Offline button—Prepares the MCS for removal from the router when pressed.
Extractor clips—Control the locking system that secures the MCS in the chassis.
The MCS, in conjunction with the routing software, performs the functions:
Monitoring and control of router components—The MCS collects statistics from all
sensors in the system. When it detects a failure or alarm condition, it sends a signal to
the Routing Engine, which generates control messages or sets an alarm. The MCS also
relays control messages from the Routing Engine to the router components.
Controlling component power-up and power-down—The MCS controls the power-up
sequence of router components as they start, and powers down components when
their offline buttons are pressed.
Signaling of mastership—In a router with more than one host module, the MCS signals
to all router components which host module is the master and which is the standby.
It relays the mastership signal for the two PCGs as well.
Providing SONET/SDH clock source—The MCS generates a 19.44-MHz SONET/SDH
clock signal, along with a signal that indicates which MCS is the master SONET/SDH
clock generator (if two MCSs are installed).
Clock monitoring—The MCS monitors the PCG system clock and its SONET/SDH clock
to verify that they are providing the expected signal. It generates an alarm if a clock
signal is incorrect.
Control of FPC resets—If the MCS detects errors in an FPC, it attempts to reset the
FPC. After three unsuccessful reset attempts, the MCS takes the FPC offline and informs
the Routing Engine. Other FPCs are unaffected, and system operation continues.
MASTER
FAIL . "M40e MCS LEDs" on page 33 describes
Copyright © 2010, Juniper Networks, Inc.
, a green one