Related
Documentation
M120 Craft Interface Description on page 23
•
•
Routing Engine Interface Ports and Status Indicators on the M120 Craft Interface on
page 25
•
External Clock Interface Ports on the M120 Craft Interface on page 25
•
Replacing the M120 Craft Interface on page 129
Routing Engine Interface Ports and Status Indicators on the M120 Craft Interface
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 13 on page 24). The set of ports in the left connects to the Routing
Engine in the left Routing Engine slot (
REO
) and the set on the right connects to the
Routing Engine (
RE1
) in the right Routing Engine slot.
The ports with the indicated label in each set function as follows:
•
AUX
—Connects the Routing Engine to a laptop, modem, or other auxiliary device
through a cable with an RJ-45 connector.
•
CONSOLE
—Connects the Routing Engine to a system console through a cable with an
RJ-45 connector.
•
ETHERNET
—Connects the Routing Engine through an Ethernet connection to a
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.
Related
Documentation
RJ-45 Connector Pinouts for the M120 Routing Engine ETHERNET Port on page 247
•
•
RJ-45 Connector Pinouts for the Routing Engine AUX and CONSOLE Ports on page 248
•
RJ-45 Connector Pinouts for the External Clock Ports on page 248
External Clock Interface Ports on the M120 Craft Interface
Two external clock ports
EXT CLOCK
to the right of the craft interface alarm LEDs enable
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]
hierarchy level. Refer to the
Junos OS System Basics
Configuration Guide
for configuration information.
The
EXT CLOCK
ports are labeled
A
and
B
. They accept two RJ-45 connectors for external
clock inputs with T1 or E1 reference clocks.
25
Copyright © 2010, Juniper Networks, Inc.
Chapter 2: M120 Hardware Components
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