Configuring T1 Loopback Capability - Juniper ACX1000 Configuration Manual

ACX Series Universal Access Router Configuration Guide

Configuring T1 Loopback Capability

170
Configuring Interface Diagnostics Tools to Test the Physical Layer Connections
You can configure loopback capability between the local T1 interface and the remote
channel service unit (CSU), as shown in
loopback to be local or remote. With local loopback, the T1 interface can transmit packets
to the CSU, but receives its own transmission back again and ignores data from the CSU.
With remote loopback, packets sent from the CSU are received by the T1 interface,
forwarded if there is a valid route, and immediately retransmitted to the CSU.
Figure 19: Remote and Local T1 Loopback
To configure loopback capability on a T1 interface, include the
the
[edit interfaces interface-name t1-options]
[edit interfaces interface-name t1-options]
loopback (local | payload | remote);
Packets can be looped on either the local router or the remote CSU. Local and remote
loopback loop back both data and clocking information.
To exchange BERT patterns between a local router and a remote router, include the
statement in the interface configuration at the remote end of the link.
loopback remote
From the local router, issue the
For more information about configuring BERT, see Configuring Interface Diagnostics Tools
to Test the Physical Layer Connections. For more information about using operational
mode commands to test interfaces, see the
For channelized T3, T1, and NxDS0 intelligent queuing (IQ) interfaces only, you can include
the statement in the configuration to loop back data only (without
loopback payload
clocking information) on the remote router's PIC. In payload loopback, overhead is
recalculated. For T3 IQ interfaces, you can include the
the
[edit interfaces ct3-fpc/pic/port]
levels. For T1 interfaces, you can include the
configuration at the [edit interfaces t1-fpc/pic/port:channel]
if included at the
[edit interfaces ct1-fpc/pic/port]
payload and remote loopback are the same. If you configure one, the other is ignored.
NxDS0 IQ interfaces do not support local loopback.
Figure 19 on page
hierarchy level:
test interface command.
.
CLI Explorer
loopback payload
and
[edit interfaces t3-fpc/pic/port:channel]
loopback payload
hierarchy level. For NxDS0 interfaces,
Copyright © 2017, Juniper Networks, Inc.
170. You can configure the
statement at
loopback
statement at
hierarchy
statement in the
hierarchy level; it is ignored