MT9072AB datasheet(185/275 Pages) ZARLINK

185 / 275 page

MT9072

Data Sheet

185

Zarlink Semiconductor Inc.

Bit

Name

Functional Description

15-14

not used.

KLVE

Keep Alive. If one, indicates that the AIS status bit (register address Y12) has been one for at

least 100 ms. This bit is zero when AIS is zero. Refer to I.431.

LOSS

Loss of Signal Status Indication. If one, indicates the presence of a loss of signal condition

on the received PCM30 link. A loss of signal condition occurs when 192 or 32 (selectable by

L32Z in Y01) consecutive bit periods are zero. A loss of signal condition terminates when an

average ones density of at least 12.5% has been received over a period of 255 contiguous

pulse positions starting with a pulse. If zero, indicates normal operation.

AIS16

Alarm Indication Signal 16 Status. If one, indicates an all ones signal (1111 1111) is being

received in timeslot16 of the received PCM30 link for the current frame. Updated on a basic

frame basis. If zero, normal operation.

AIS

Alarm Indication Status Signal. If one, indicates that an Alarm Indication Signal (AIS) is

detected on the received PCM30 link. The criteria (i.e., less than three zeros in a two frame

period) for AIS detection is determined by the control bit ASEL (register address Y00). If the

AIS bit is zero, indicates that an AIS signal not being received.

9RAI

Remote Alarm Indication Status. Indicates the status of the bit (A-bit) received on the

PCM30 link in bit position 3 of timeslot 0 of the non-frame alignment signal (NFAS) frames. If

one, there is currently a remote alarm condition. Updated on a NFAS frame basis.

This bit is identical to the RAI bit of register address Y13 and is duplicated here for

convenience.

8AUXP

Auxiliary Pattern. If one, an auxiliary pattern (101010) of at least 512 bits is being received

on the PCM30 link. If zero, an auxiliary pattern is not being received. This pattern will be

decoded in the presents of a bit error rate of as much as 10-3.

RMA1

RMA2

RMA3

RMA4

Receive Multiframe Alignment Bits One to Four. Indicates the status of the bits received on

the PCM30 link in bit positions one to four of timeslot 16 of frame 0 of the multiframe

alignment signal (MAS). These bits should be 0000 for proper signaling multiframe alignment.

Updated on a MAS frame basis.

3X1

Receive Spare Bit X1. Indicates the status of the bit received on the PCM30 link in bit

position five of timeslot 16 of frame 0 of the multiframe alignment signal (MAS). Updated on a

MAS frame basis.

Receive Y-bit. Indicates the status of the bit (Y-bit) received on the PCM30 link in bit position

six of timeslot 16 of frame 0 of the multiframe alignment signal (MAS). Updated on a MAS

frame basis. If one, typically indicates a loss of multiframe alignment at the remote end. If

zero, typically indicates acquired multiframe alignment at the remote end.

Receive Spare Bits X2 and X3. Indicates the status of the bits received on the PCM30 link in

bit positions seven and eight of timeslot 16 of frame 0 of the multiframe alignment signal

(MAS). Updated on a MAS frame basis.

Table 155 - Alarms & Multiframe Signaling (MAS) Status (R Address Y12) (E1)

MT9072AB Datasheet(PDF) 185 Page - Zarlink Semiconductor Inc

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