MT9079AC datasheet(36/54 Pages) MITEL

36 / 54 page

MT9079

4-272

LOSS

Loss of Signal Status Indication. If

one, indicates the presence of a loss

of signal condition. If zero, indicates

normal operation. A loss of signal

condition occurs when there is an

absence of the receive PCM 30 sig-

nal for 255 contiguous pulse (bit)

positions

from

the

last

received

pulse. A loss of signal condition ter-

minates when an average ones den-

sity of at least 12.5% has been

received over a period of 255 contig-

uous pulse positions starting with a

pulse.

AIS16S

Alarm Indication Signal 16 Status. If

one, indicates an all ones alarm is

being received in channel 16. If zero,

normal operation. Updated on a

frame basis.

AISS

Alarm Indication Status Signal. If

one, indicates that a valid AIS or all

ones signal is being received. If zero,

indicates that a valid AIS signal is not

being received. The criteria for AIS

detection is determined by the con-

trol bit ASEL.

RAIS

Remote Alarm Indication Status. If

one, there is currently a remote alarm

condition. If zero, normal operation.

Updated on a non-frame alignment

frame basis.

RCRS

RAI and Continuous CRC Error Sta-

tus. If one, there is currently an RAI

and continuous CRC error condition.

If zero, normal operation. Updated on

a submultiframe basis.

Bit

Name

Functional Description

Table 58 - Alarm Status Word One

(Page 3, Address 19H) (continued)

Status Page 4

Tables 59 to 66 describe the bit functions of the page 4

status registers and counters.

The Internal Vector

Status Word is cleared automatically after it is read by

the microprocessor. The RESET and RST functions

do not affect the page 4 counters.

Therefore,

individual counters must be initialized to a starting

value by a write operation or a counter load operation

(Table 43) in ST-BUS control mode. When presetting

or clearing the BPV counter, BPV7-BPV0 should be

written to first, and BPV15-BPV8 should be written to

last.

Bit

Name

Functional Description

7 - 0

IV7

IV0

Interrupt Vector Bits 7 to 0. The inter-

rupt vector status word contains an

interrupt vector that indicates the cat-

egory of the last interrupt. See the

section on interrupts.

Table 59 - Interrupt Vector Status Word

(Page 4, Address 12H)

Bit

Name

Functional Description

7 - 0

BR7

BR0

Bit Error Rate Counter. An eight bit

counter that contains the total num-

ber of bit errors received in a specific

time slot. See the

BFAS control bit

function of page 1, address 1AH.

Table 60 - Bit Error Rate Counter

(Page 4, Address 18H)

Bit

Name

Functional Description

7 - 0

RCRC7

RCRC0

RAI

and

Continuous

CRC

Error

Counter. An 8 bit counter that is

incremented once for every concur-

rent occurrence of the receive RAI

equal to one and either E-bit equal to

zero. Updated on a multiframe basis.

Table 61 - RAI and Continuous CRC Error Counter

(Page 4, Address 19H)

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