MT9072AB datasheet(8/275 Pages) ZARLINK

8 / 275 page

MT9072

Data Sheet

Zarlink Semiconductor Inc.

Alarms

T1/J1 Mode

E1 Mode

Yellow Alarm

D4 mode, two types:

1. Bit position 2 is zero for virtually every DS0

over 48ms

2. Two consecutive ones in the S-bit position of

the twelfth frame

ESF mode, two types:

3. Reception of 0000000011111111 in eight or

more codewords out of ten (T1)

4. Reception of 1111111111111111 in eight or

more codewords out of ten (J1)

T1DM mode :

Bit 2 of the T1DM synchronization byte is 0

Alarm Indication Signal (AIS)

•

Declared if fewer than six zeros are detected

during a 3 ms interval

Loss Of Signal (LOS)

•

Loss Of Signal is declared if 192 or 32

consecutive zeros are received

Remote Alarm Indication (RAI)

•

Bit 3 of the receive NFAS

Alarm Indication Signal (AIS)

•

Unframed all ones signal for at least a double

frame or two double frames

Timeslot 16 Alarm Indication Signal

•

All ones signal in timeslot 16

Loss Of Signal (LOS)

•

Loss Of Signal is declared if 192 or 32

consecutive zeros are received

Remote Signaling Multiframe Alarm

•

Y-bit of the multiframe alignment signal

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