Local Loopback; Remote Loopback; Figure 7-2. Local Loopback Screen - ADTRAN TSU LT User Manual

Chapter 7. Test Menu

LOCAL LOOPBACK

There are three choices available for setting the local loopback:
No Loopback
Deactivates the loopback.
Line On
Activates the line loopback.
Payload On
Activates the payload loopback.

REMOTE LOOPBACK

Activates the same loopbacks as the
specified by AT&T 62411 for line loopback (ATT In-Band LLB), or the FDL as specified in ANSI T1.403
for payload and line loopback codes. An FDL (formerly TABS) maintenance message corresponding to
AT&T TR54016 can be used for payload loopback as well.
No Loopback
Deactivates the loopback.
V.54 Inband PLB
Indicates inband transmission of V.54 loopup pattern in channels occupied by DTE data only. This
choice should be used for public fractional network.
AT&T Inband LLB
Activates the line loopback using inband code.
AT&T Inband LLB
Activates the line loopback using inband code.
ANSI FDL LLB
Initiates the transmission of an FDL line loop-up code toward the far end.
AT&T PLB
Indicates the transmission of the PLB maintenance on the FDL.
54

Figure 7-2. Local Loopback Screen

but at the far end. This uses either the inband loopup code as
L
OCAL
© 2002 ADTRAN, Inc.
TSU LT User Manual
61202060L4-1