Specifications

D8E1T1 Installation and Operation Manual Chapter 4 Troubleshooting and Diagnostics
Diagnostic Loops 4-9
Table 4-6. Loop Selection Screen Options
Option Description
[O]ff
No loopbacks are enabled.
[L]ocal
Local Loop causes data from the DXC-100 to be looped back to itself at the Network
Interface port. (Use in Clear T1/E1 Disabled, Framed, and Unframed Mode).
See Figure 4-7 for a visual representation of this loopback.
Li[n]e
Line Loop causes frames at the NI to be looped back towards the network from the
DXC-100 unit where the command was entered. The framing is not regenerated. In a
point-to-point circuit, Line Loop is useful for looping back any testing initiated by the
other end. (Use in Clear T1/E1 Disabled, Framed, and Unframed Mode).
See Figure 4-7
for a visual representation of this loopback.
[A]nalog
Analog Line Loop causes frames at the NI to be looped back towards the network from
the DXC-100 unit where the command was entered. The framing is not regenerated. In a
point-to-point circuit, Analog Line Loop is useful for looping back any testing initiated by
the other end. (Use in Clear T1/E1 Disabled, Framed, and Unframed Mode).
See Figure 4-7
for a visual representation of this loopback.
[R]emote
Remote Loop causes a loop at the distant end of a point-to-point circuit, and is useful for
looping back testing initiated from the local side. (Use in Clear T1/E1 Disabled Mode).
Note: Payload loop will not function when using Clear T1/E1 Unframed mode.
See Figure 4-7
for a visual representation of this loopback.
[P]ayload
Payload Loop is very similar to a Line Loop, except that it only loops the data (payload)
and the framing is regenerated. (Use in Clear T1/E1 Disabled Mode.
Note: Payload loop will not function when using Clear T1/E1 Unframed mode.
See Figure 4-7
for a visual representation of this loopback.
[S]martJack
Transmits a code that is recognized by a remote SmartJack, which then puts itself into
loopback towards the DXC-100.
See Figure 4-7
for a visual representation of this loopback.
[U]ser Defined
Similar to a Smart Jack Loop, this feature allows you to place remote equipment into
loopback by sending a code to the equipment. The proper code needs to be obtained
from the remote equip- ment’s manufacturer or operator. Various elements of the code
can be defined, such as the length and value for both the activate and deactivate code.
See User-Defined Loop for further explanation of this loopback and how to set it up.
Backplane Loop
(Toggle):
(option field)
Backplane Loop is designed to check the integrity of the backplane and allow testing
through the D8E1T1 port from the remote side to the backplane and back to the tester.
Select Yes to enable the backplane loop, and No to disable the backplane loop.