MT9079AC datasheet(34/54 Pages) MITEL

34 / 54 page

MT9079

4-270

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 align-

ment signal. These bits form the

frame alignment signal and should

be 0011011.

Table 52 - Receive Frame Alignment Signal

(Page 3, Address 11H)

Bit

Name

Functional Description

1SEC

One Second Timer Status. This bit

changes state once every 0.5 sec-

onds 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.

CRCT

CRC-4

Timer

Status.

This

bit

changes from one-to-zero at the start

of the one second interval in which

CRC errors are accumulated. This bit

stays high for 8 msec.

EBT

E-Bit Timer Status. This bit changes

from one-to-zero at the start of the

one second interval in which E-bit

errors are accumulated. This bit

stays high for 8 msec.

400T

400 msec. Timer Status. This bit

changes state when the 400 msec.

CRC-4 multiframe alignment timer

expires.

msec.

Timer

Status.

This

bit

changes state when the 8 msec.

CRC-4 multiframe alignment timer

expires.

CALN

CRC-4 Alignment. When CRC-4 mul-

tiframe

alignment

has

not

been

achieved this bit changes state every

2 msec. When CRC-4 multiframe

alignment has been achieved this bit

synchronous

with

the

receive

CRC-4 multiframe signal.

---

Unused.

Table 53 - Timer Status Word

(Page 3, Address 12H)

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 to dif-

ferentiate 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 of the non-frame

alignment signal. It is used to indicate

an alarm from the remote 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 of the non-frame align-

ment signal.

Table 54 - Receive Non-frame Alignment Signal

(Page 3, Address 13H)

Bit

Name

Functional Description

7 - 4

RMA1-4

Receive Multiframe Alignment Bits

One to Four. These bits are received

on the PCM 30 2048 kbit/sec. link in

bit positions one to four of time slot

16 of frame zero of every multiframe.

These bit should be 0000 for proper

multiframe alignment.

Receive Spare Bit X1. This bit is

received

on the

PCM

2048

kbit/sec. link in bit position five of

time slot 16 of frame zero of every

multiframe.

Receive Y-bit Alarm. This bit is

received

on the

PCM

2048

kbit/sec. link in bit position six of time

slot 16 of frame zero of every multi-

frame. It indicates loss of multiframe

alignment at the remote end (1 -loss

of multiframe alignment; 0 - multi-

frame alignment acquired).

1 - 0

X2, X3

Receive Spare Bits X2 and X3.

These bits are received on the PCM

30 2048 kbit/sec. link in bit positions

seven and eight respectively, of time

slot 16 of frame zero of every multi-

frame.

Table 55 - Receive Multiframe Alignment Signal

(Page 3, Address 14H)

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