MT9075AL datasheet(42/78 Pages) MITEL

42 / 78 page

MT9075A

Preliminary Information

4-170

Table 34 - Receive Frame Alignment Signal

(Page 03H, Address 11H)

Bit

Name

Functional Description

SYNC

Receive Basic Frame Alignment.

SYNC indicates the basic frame

alignment status (1 - loss; 0 -

acquired).

MFSYNC Receive

Multiframe

Alignment.

MFSYNC indicates the multiframe

alignment status (1 - loss; 0 -

acquired).

CRCSYN Receive CRC-4 Synchronization.

CRCSYN

indicates

the

CRC-4

multiframe alignment status (1 -

loss; 0 - acquired).

REB1

Receive E-Bit One Status. REB1

indicates the status of the received

E1 bit of the last multiframe.

REB2

Receive E-Bit Two Status. REB2

indicates the status of the received

E2 bit of the last multiframe.

CRCRF

CRC-4 Reframe. A one indicates

that the receive CRC-4 multiframe

synchronization could not be found

within the time out period of 8 msec.

after

detecting

basic

frame

synchronization. This will force a

reframe

when

the

maintenance

option is selected and automatic

CRC-4 interworking is de-selected.

RED

RED Alarm. RED goes high when

basic frame alignment has been lost

for at least 100 msec. This bit will be

low when basic frame alignment is

acquired (I.431).

CRCIWK CRC-4

Interworking.

CRCIWK

indicates the CRC-4 interworking

status (1 - CRC-to-CRC; 0 - CRC-

to-non-CRC).

Table 33 - Synchronization Status Word

(Page 03H, Address 10H)

Bit

Name

Functional Description

RIU0

Receive International Use Zero.

This is the bit which is received on

the PCM 30 2048 kbit/sec. link in bit

position one of the frame alignment

signal. It is used for the CRC-4

remainder or for international use.

6 - 0

RFA2-8

Receive Frame Alignment Signal

Bits 2 to 8. These bit are received

on the PCM 30 2048 kbit/sec. link in

bit positions two to eight of frame

alignment signal. These bits form

the frame alignment signal and

should be 0011011.

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