XRT72L13 Datasheet, PDF (129/370 Pages) Exar Corporation – M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

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PRELIMINARY
M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC XRT72L13
REV. 1.0.6
This “Read/Write” bit-field permits the user to config-
ure the XRT72L13 to transmit a “DS1 Channel 12 -
Loop-back Request” signal to the Remote Terminal
Equipment. When the Remote Terminal Equipment
receives this request, it is expected to respond by
configuring its own DS1 Channel 12 signal into Loop-
back Mode.
NOTE: This bit-field is ignored if the XRT72L13 has been
configured to operate in the “ITU-T G.747” Mode.
2.3.2.42 M12 DS2 # 5 Loopback Request Regis-
ter )
M12 DS2 # 5 LOOP-BACK REGISTER (ADDRESS = 0X2C)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Loop-back Loop-back Loop-back Loop-back Loop-back Loop-back Loop-back Loop-back
Activation Activation Activation Activation
Request
Request
Request
Request
DS1 Channel DS1 Channel DS1 Channel DS1 Channel DS1 Channel DS1 Channel DS1 Channel DS1 Channel
19
18
17
16
19
18
17
16
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
Bit 7 - Loop-back Activation - DS1 Channel 19
This “Read/Write” bit-field permits the user to config-
ure DS1 Channel 19 into Remote Loop-back Mode.
When this loop-back is configured, then the
“RxDS1Data_19” signal will internally be “looped-
back” into the “TxDS1Data_19” path. Further, the
“RxDS1Clock_19” clock signal will also be internally
looped back into the “RxDS1Clock_19” signal path.
Setting this bit-field to “1” enables this loop-back
mode. Conversely, setting this bit-field to “0” disables
this loop-back mode.
NOTE: This bit-field is ignored if the XRT72L13 has been
configured to operate in the “ITU-T G.747” Mode.
Bit 6 - Loop-back Activation - DS1 Channel 18
This “Read/Write” bit-field permits the user to config-
ure DS1 Channel 18 into Remote Loop-back Mode.
When this loop-back is configured, then the
“RxDS1Data_18” signal will internally be “looped-
back” into the “TxDS1Data_18” path. Further, the
“RxDS1Clock_18” clock signal will also be internally
looped back into the “RxDS1Clock_18” signal path.
Setting this bit-field to “1” enables this loop-back
mode. Conversely, setting this bit-field to “0” disables
this loop-back mode.
Bit 5 - Loop-back Activation - DS1 Channel 17
This “Read/Write” bit-field permits the user to config-
ure DS1 Channel 17 into Remote Loop-back Mode.
When this loop-back is configured, then the
“RxDS1Data_17” signal will internally be “looped-
back” into the “TxDS1Data_17” path. Further, the
“RxDS1Clock_17” clock signal will also be internally
looped back into the “RxDS1Clock_17” signal path.
Setting this bit-field to “1” enables this loop-back
mode. Conversely, setting this bit-field to “0” disables
this loop-back mode.
Bit 4 - Loop-back Activation - DS1 Channel 16
This “Read/Write” bit-field permits the user to config-
ure DS1 Channel 16 into Remote Loop-back Mode.
When this loop-back is configured, then the
“RxDS1Data_16” signal will internally be “looped-
back” into the “TxDS1Data_16” path. Further, the
“RxDS1Clock_16” clock signal will also be internally
looped back into the “RxDS1Clock_16” signal path.
Setting this bit-field to “1” enables this loop-back
mode. Conversely, setting this bit-field to “0” disables
this loop-back mode.
Bit 3 - Loop-back Request - DS1 Channel 19
This “Read/Write” bit-field permits the user to config-
ure the XRT72L13 to transmit a “DS1 Channel 19 -
Loop-back Request” signal to the Remote Terminal
Equipment. When the Remote Terminal Equipment
receives this request, it is expected to respond by
configuring its own DS1 Channel 19 signal into Loop-
back Mode.
NOTE: This bit-field is ignored if the XRT72L13 has been
configured to operate in the “ITU-T G.747” Mode.
Bit 2 - Loop-back Request - DS1 Channel 18
This “Read/Write” bit-field permits the user to config-
ure the XRT72L13 to transmit a “DS1 Channel 18 -
Loop-back Request” signal to the Remote Terminal
Equipment. When the Remote Terminal Equipment
receives this request, it is expected to respond by
configuring its own DS1 Channel 18 signal into Loop-
back Mode.
NOTE: This bit-field is ignored if the XRT72L13 has been
configured to operate in the “ITU-T G.747” Mode.
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