MT9072AB datasheet(121/275 Pages) ZARLINK

121 / 275 page

MT9072

Data Sheet

121

Zarlink Semiconductor Inc.

Bit

Name

Functional Description

15-6

not used.

5DLBK

(0)

Digital Loopback. If one, then the digital streams (TPOS/TNEG) are looped to RPOS/RNEG.

Data coming out of DSTo will be a delayed version of DSTi. Hence the data path is DSTi through

the Transmitter to RPOS/RNEG and through the receiver to DSTo.

4RLBK

(0)

Remote Loopback. If one, then all timeslots received on RPOS/RNEG are connected to

TPOS/TNEG on the DS1 side of the MT9072. If zero, then this feature is disabled.

3STLBK

(0)

ST-BUS Loopback. If one, then the last bit in the frame and the first 24 timeslots of DSTi are

connected to the last bit in the frame and the first 24 timeslots of DSTo on the ST-BUS side of the

MT9072. If zero, then this feature is disabled. See Loopbacks section.

2PLBK

(0)

Payload Loopback. If one, then all timeslots received on RPOS/RNEG are connected to

TPOS/TNEG on the ST-BUS side of the MT9072. Hence DSTo is looped back to DSTi. If zero,

then this feature is disabled. Set the bit RxDO (YF1 bit 9) for the payload loopback data to

appear at the transmitter output.

1TLU

(0)

TxLoopUp Code. If this bit is set inband line loopup code is sent. The loopup code to be sent is

determined by the Tx Loopup Code register. Note that the receiver will detect either framed or

unframed inband loop codes.

0TLD

(0)

TxLoopDown Code. If this bit is set inband line loopdown code is sent. The loopdown code to

be sent is determined by the Tx LoopDown Code register. If both TLU and TLD are set TLD

takes precedence.

Table 68 - LoopBack Control Word (Y05) (T1)

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