M120 Alarm Relay Contacts On The Craft Interface; M120 External Clock Interface Ports On The Craft Interface; M120 Routing Engine Interface Ports And Status Indicators - Juniper M120 Hardware Manual

M120 Multiservice Edge Router Hardware Guide

M120 Alarm Relay Contacts on the Craft Interface

M120 External Clock Interface Ports on the Craft Interface

M120 Routing Engine Interface Ports and Status Indicators

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and LEDs for the front and rear fan trays.
OK FAIL
and LEDs for each power supply.
OK FAIL
The host interface has two alarm relay contacts for connecting the router to external
alarm devices (see Figure 6 on page
the red or yellow alarm on the craft interface, the alarm relay contacts are also activated.
The alarm relay contacts are located below the Routing Engine ports.
Two external clock ports
EXT CLOCK
you to connect the router's internal Stratum 3 clock to an external reference clock source
with an RJ-45 cable. Using the router's software, you can configure the internal Stratum
3 clock to synchronize with an external Building Integrated Timing System (BITS) or SDH
Equipment Timing Source (SETS) timing source by including a clock synchronization
statement at the
[edit chassis]
NOTE: Refer to the, Junos OS Administration Library for configuration
information.
The EXT CLOCK ports are labeled
clock inputs with T1 or E1 reference clocks.
To the right of the alarm relay contact on the craft interface are two sets of ports that
connect the Routing Engines to one or more external devices on which system
administrators can issue Junos OS command-line interface (CLI) commands to manage
the router (see Figure 6 on page
Engine in the left Routing Engine slot (
Routing Engine ( RE1 ) in the right Routing Engine slot.
The ports with the indicated label in each set function as follows:
—Connects the Routing Engine to a laptop, modem, or other auxiliary device
AUX
through a cable with an RJ-45 connector.
—Connects the Routing Engine to a system console through a cable with an
CONSOLE
RJ-45 connector.
—Connects the Routing Engine through an Ethernet connection to a
ETHERNET
management LAN (or any other device that plugs into an Ethernet connection) for
out-of-band management. The port uses an autosensing RJ-45 connector to support
both 10- and 100-Mbps connections. Two small LEDs on the bottom of the port indicate
the connection in use: the LED lights yellow or green for a 10-Mbps or 100-Mbps
connection, and the LED lights green when traffic is passing through the port.
11). Whenever a system condition triggers either
to the right of the craft interface alarm LEDs enable
hierarchy level.
A and B . They accept two RJ-45 connectors for external
11). The set of ports in the left connects to the Routing
) and the set on the right connects to the
REO
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