XRT72L13 datasheet(129/370 Pages) EXAR

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M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

XRT72L13

PRELIMINARY

REV. 1.0.6

117

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 )

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.

M12 DS2 # 5 LOOP-BACK REGISTER (ADDRESS = 0X2C)

BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0

Loop-back

Activation

DS1 Channel

Loop-back

Activation

DS1 Channel

Loop-back

Activation

DS1 Channel

Loop-back

Activation

DS1 Channel

Loop-back

Request

DS1 Channel

Loop-back

Request

DS1 Channel

Loop-back

Request

DS1 Channel

Loop-back

Request

DS1 Channel

R/W

0000

000

XRT72L13 Datasheet(PDF) 129 Page - Exar Corporation

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