User manual

Chapter 7. Test Menu
61202156L1-1 TDU 120e User Manual 7-3
Payload
Similar to line loopback, except that the framing is extracted
from the received data and then regenerated for the transmit-
ted data.
Figure 7-2. Network Loopback Tests
Local Loopbck
There are three available choices for setting the local
loopback.
Line On
Activates the line loopback.
Payload On
Activates the payload loopback.
No Loopback
Deactivates the loopback. Scroll to select a setting and press
Enter
to record the setting.
Remote Loopback
Activates the same loopbacks as Local Loopback, but at the
far end. Uses either the inband loop-up code as specified by
ANSI T1.403 for line loopback (ATT In-Band LLB), or the
FDL as specified in ANSI T1.403 for payload and line
loopback codes.
The following options are available:
TDU 120e
DS1
NI CSU
Payload Loopback
Line Loopback
Secondary
Interface