Juniper JUNOSE 11.2.X MULTICAST ROUTING, Configuration Manual

Page: 44 / 256

•
Use the no version to restore the default, 1600 bytes.
•
See mtu.
serial description
•
Use to assign a text description or an alias to a serial HDLC interface.
•
You can use this command to help you identify the interface and keep track of interface
connections.
•
The description or alias can be a maximum of 80 characters.
•
Use “show interfaces serial” on page 41 to display the text description.
•
Example
host1(config-if)# serial description ottawa012 hdlc channel
•
Use the no version to remove the text description or alias.
•
See serial description.
Configuration Example
The following example illustrates how to configure the layers on a channelized T3
interface:
host1(config)# controller t3 0/1
host1(config-controll)# no shutdown
host1(config-controll)# framing c-bit
host1(config-controll)# clock source internal module
host1(config-controll)# cablelength 220
host1(config-controll)# t1 2 framing es f
lihost1(config-controll)# t1 2 clock source internal
host1(config-controll)# t1 2 loopback local
host1(config-controll)# t1 2/1 timeslots 1,3-8,10
host1(config-controll)# exit
host1(config)# interface serial 0/1:2/1
host1(config-if)# invert data
host1(config-controll)# exit
Testing Interfaces
If you want to run loopback tests or bit error rate tests on channelized T3 interfaces, you
must enable testing at the T3 or T1 layer. See “Interface Stack” on page 6 for a description
of the layers.
For a list of the modules that support bit error rate tests (BERTs) and remote loopback,
see
ERX Module Guide , Appendix A , Module Protocol Support .
NOTE: BERTs are supported on frame-based channelized T3 interfaces, with the
exception of the CT3/T3 line module used with the 3-port CT3/T3 I/O module.
Copyright © 2010, Juniper Networks, Inc. 22
JunosE 11.2.x Physical Layer Configuration Guide