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MX2800 M13 Multiplexer User Manual
Transaction Language 1 (TL1), Section 9
61200290L1-1G
    9-31
 describes each of the DS1 loopbacks that can be initiated or released with DS1 TL1 loopback 
commands.
*
The value of xy may be 01 through 28, corresponding to the desired DS1 channel.
Table 9-12.  DS1 TL1 Loopback Commands
Verb
MOD2
<aid>
*
<locn>
<lpbktype>
Description
OPR
T1
1xy
NEND
NETWORK
Initiates the DS1 Tributary Loopback
RLS
T1
1xy
NEND
NETWORK
Releases the DS1 Tributary Loopback
OPR
T1
1xy
NEND
TERMINAL
Initiates the DS1 Analog Loopback
RLS
T1
1xy
NEND
TERMINAL
Releases the DS1 Analog Loopback
OPR
T1
1xy
NEND
DIGNET
Initiates the DS1 Digital Line/Net Loopback
RLS
T1
1xy
NEND
DIGNET
Releases the DS1 Digital Line/Net 
Loopback
OPR
T1
1xy
NEND
CODEC
Initiates the DS1 Codec Line/Net Loopback
RLS
T1
1xy
NEND
CODEC
Releases the DS1 Codec Line/Net Loopback
OPR
T1
1xy
FEND
DS1FEAC
Initiates the DS1 Remote Loopback
RLS
T1
1xy
FEND
DS1FEAC
Releases the DS1 Remote Loopback
OPR
T1
1xy
FEND
CSULPBK
Initiates the DS1 CSU Loopback
RLS
T1
1xy
FEND
CSULPBK
Releases the DS1 CSU Loopback
OPR
T1
1xy
FEND
CSUBERT
Initiates the DS1 CSU Loopback w/BERT
RLS
T1
1xy
FEND
CSUBERT
Releases the DS1 CSU Loopback w/BERT
RLS
Releases any active DS1 Loopback