Juniper ACX1000 Configuration Manual page 229

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To determine whether a problem is internal or external, you can loop packets on both
the local and the remote router. To do this, include the
statements at the
cisco-hdlc
loopback local statement at the
as shown in the following example:
[edit interfaces]
t1-1/0/0 {
no-keepalives;
encapsulation cisco-hdlc;
t1-options {
loopback local;
}
unit 0 {
family inet {
address 10.100.100.1/24;
}
}
}
NOTE: To configure the CT1 loopback capability on the 16-port Channelized
E1/T1 Circuit Emulation MIC (MIC-3D-16CHE1-T1-CE), use the
statement at the
With this configuration, the link stays up, so you can loop ping packets to a remote router.
The statement causes the interface to loop within the PIC just before the
loopback local
data reaches the transceiver.
To turn off the loopback capability, remove the
[edit]
user@host# delete interfaces t1-fpc/pic/port t1-options loopback
You can determine whether there is an internal problem or an external problem by
checking the error counters in the output of the
command, for example:
user@host> show interfaces t1-fpc/pic/port extensive
Configuring E1 Loopback Capability on page 167
Performing a Loopback Test on an Interface
Chapter 5: Configuring E1 and T1 Interfaces
[edit interfaces interface-name]
[edit interfaces interface-name t1-options]
[edit interfaces ct1-fpc/pic/port]
loopback
show interface interface-name extensive
and
no-keepalives encapsulation
hierarchy level and the
hierarchy level,
loopback
hierarchy level.
statement from the configuration:
171