MT9075B datasheet(44/78 Pages) MITEL

44 / 78 page

MT9075B

Preliminary Information

Table 39 - Timer Status Word

(Page 03H, Address 12H)

Table 40 - Receive Non-Frame Alignment Signal

(Page 03H, Address 13H)

Bit

Name

Functional Description

1SEC

One Second Timer Status. This bit

changes

state

once

every

0.5

second and is synchronous with the

2SEC timer.

2SEC

Two Second Timer Status. This bit

changes state once every second

and is synchronous with the 1SEC

timer.

5T1

Timer One. This bit will be high

after a signal has been received,

that

consists

non-normal

operation frames, and persists for

100 msec. This bit shall be low

when T2 becomes high. Refer to

I.431 Section 5.9.2.2.3.

4T2

Timer Two. This bit will be high

when

the

MT9075B

acquires

terminal

frame

synchronization

persisting for 10 msec. This bit shall

low

when

non-normal

operational frames are received.

I.431 Section 5.9.2.2.3.

400T

400 msec. Timer Status. This bit

changes state when the 400 msec.

CRC-4 multiframe alignment timer

expires.

28T

8 msec. Timer Status. This bit

changes state when the 8 msec.

CRC-4 multiframe alignment timer

expires.

CALN

CRC-4 Alignment. This bit changes

state every msec. When CRC-4

multiframe

alignment

has

been

achieved state changes of this bit

are synchronous with the receive

CRC-4 synchronization signal.

KLVE

Keep Alive. This bit is high when

the AIS status bit (page 03H,

address 19H) has been high for at

least 100msec. This bit will be low

when AIS goes low (I.431).

Bit

Name

Functional Description

RIU1

Receive International Use 1. This

bit is received on the PCM 30 2048

kbit/sec. link in bit position one of

the non-frame alignment signal. It is

used

for

CRC-4

multiframe

alignment or international use.

RNFAB

Receive

Non-frame

Alignment

Bit. This bit is received on the PCM

30 2048 kbit/sec. link in bit position

two of the non-frame alignment

signal. This bit should be one in

order

differentiate

between

frame alignment frames and non-

frame alignment frames.

RALM

Receive Alarm. This bit is received

on the PCM 30 2048 kbit/sec. link in

bit position three (the A bit) of the

non-frame alignment signal. It is

used as a remote alarm indication

(RAI) from the far end of the PCM

30 link (1 - alarm, 0 - normal).

4 - 0

RNU4-8 Receive National Use Four to

Eight. These bits are received on

the PCM 30 2048 kbit/sec. link in bit

positions four to eight (the Sa bits)

of the non-frame alignment signal.

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