XRT72L13 datasheet(127/370 Pages) EXAR

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M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

XRT72L13

PRELIMINARY

REV. 1.0.6

115

When this loop-back is configured, then the

“RxDS1Data_11” signal will internally be “looped-

back” into the “TxDS1Data_11” path. Further, the

“RxDS1Clock_11” clock signal will also be internally

looped back into the “RxDS1Clock_11” 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 10

This “Read/Write” bit-field permits the user to config-

ure DS1 Channel 10 into Remote Loop-back Mode.

When this loop-back is configured, then the

“RxDS1Data_10” signal will internally be “looped-

back” into the “TxDS1Data_10” path. Further, the

“RxDS1Clock_10” clock signal will also be internally

looped back into the “RxDS1Clock_10” 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 9

This “Read/Write” bit-field permits the user to config-

ure DS1 Channel 9 into Remote Loop-back Mode.

When this loop-back is configured, then the

“RxDS1Data_9” signal will internally be “looped-back”

into the “TxDS1Data_9” path. Further, the

“RxDS1Clock_9” clock signal will also be internally

looped back into the “RxDS1Clock_9” 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 8

This “Read/Write” bit-field permits the user to config-

ure DS1 Channel 8 into Remote Loop-back Mode.

When this loop-back is configured, then the

“RxDS1Data_8” signal will internally be “looped-back”

into the “TxDS1Data_8” path. Further, the

“RxDS1Clock_8” clock signal will also be internally

looped back into the “RxDS1Clock_8” 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 11

This “Read/Write” bit-field permits the user to config-

ure the XRT72L13 to transmit a “DS1 Channel 11 -

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 11 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 10

This “Read/Write” bit-field permits the user to config-

ure the XRT72L13 to transmit a “DS1 Channel 10 -

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 10 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 1 - Loop-back Request - DS1 Channel 9

This “Read/Write” bit-field permits the user to config-

ure the XRT72L13 to transmit a “DS1 Channel 9 -

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 9 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 0 - Loop-back Request - DS1 Channel 8

This “Read/Write” bit-field permits the user to config-

ure the XRT72L13 to transmit a “DS1 Channel 8 -

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 8 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.

2.3.2.41 M12 DS2 # 4 Loop-back Request Regis-

ter

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