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Chapter 7 Test Menu TSU LT 220V User Manual

Local Loopback

The three choices available for setting the local loopback include NO LOOPBACK, LINE ON, and

AYLOAD ON. Figure 7-2 shows an illustration of how the tests work.

Figure 7-2. Network Loopback Tests

Remote Loopback

Activates loopback tests at the far end.

No Loopback

Deactivates the loopback.

Line On

Activates the line loopback, which loops all of the received data back toward the

network. The transmitted data is the identical line code that was received, including

any bipolar violations or framing errors.

Payload On

Activates the payload loopback, which is similar to line loopback except that the

framing is extracted from the received data and then regenerated for the transmitted

data.

No Loopback

Deactivates the loopback.

V.54 Inband PLB

Indicates inband transmission of V.54 loop-up pattern in channels occupied by

DTE data only. This choice should be used for public fractional network.

ANSI FDL LLB

Per ANSI T1.403, initiates the transmission of a Facility Data Link (FDL) line

loop-up code toward the far end using the following 2-byte bit patterns:

00001110 11111111.

AT&T Inband LLB

Per AT&T 62411, activates the line loopback using inband code.

ANSI FDL PLB

Per ANSI T1.403, activates the payload loopback (PLB) on the FDL using the

following 2-byte bit patterns: 00010100 11111111.

AT&T FDL PLB

Per AT&T TR54016, initiates the transmission of the PLB on the FDL using a

request message.

Only V.54 loopbacks can be used with fractional T1 since the full T1 stream including the

FDL is not transported to the far end (unless it is a private network).

Facility Data Link (FDL) specifically relates to ESF.

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ADTRAN TSU LT Manuel d'utilisateur Page 46