MT9076 Просмотр технического описания (PDF) - Mitel Networks

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MT9076

T1/E1/J1 3.3V Single Chip Transceiver

Mitel Networks 

MT9076

Preliminary Information

Channel Associated Signaling

• ABCD or AB bits can be automatically inserted and extracted

• Transmit ABCD or AB bits can be passed via the microport or via the CSTi pin

• Receive ABCD or AB bits are accessible via the microport or via the CSTo pin

• Most significant or least significant CSTi/CSTo nibbles can be selected to carry signaling bits

• Unused nibble positions in the CSTi/CSTo bandwidth are tri-stated

• An interrupt is provided in the event of changes in any of the signaling bits

• Receive signaling bits are frozen if signaling multiframe alignment is lost

T1/J1 Mode

• Signaling bits can be debounced by 6 ms

Alarms

T1/J1 Mode

D4 Yellow Alarm, 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 Yellow Alarm, two types

1. Reception of 0000000011111111 in seven

or more codewords out of ten (T1)

2. Reception of 1111111111111111 in seven

or more codewords out of ten (J1)

Alarm Indication Signal (AIS)

• Declared if fewer than six zeros are detected

during a 3 ms interval

Loss Of Signal (LOS)

• Analog Loss Of Signal is declared if the

received signal is more than 20 dB or 40 dB

below nominal for at least 1 ms

• Digital Loss Of Signal is declared if 192 or 32

consecutive zeros are received

• Output pin indicates LOS and/or loss of

frame alignment

E1 Mode

• Signaling bits can be debounced by14 ms

E1 Mode

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)

• Analog Loss Of Signal is declared if the

received signal is more than 20 dB or 40 dB

below nominal for at least 1 ms

• Digital Loss Of Signal is declared if 192 or 32

consecutive zeros are received

• Output pin indicates LOS and/or loss of

frame alignment

Remote Signaling Multiframe Alarm

• Y-bit of the multiframe alignment signal

14

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