DS3141 datasheet(40/88 Pages) DALLAS

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DS3141/DS3142/DS3143/DS3144 Single/Dual/Triple/Quad DS3/E3 Framers

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Table 7-E. DS3 Alarm Criteria

ALARM/

CONDITION

FUNCTION

SET CRITERIA

CLEAR CRITERIA

AIS

Alarm Indication Signal. Properly

framed 1010... pattern (starting

with 1 after each overhead bit),

all C bits set to 0

In each 84-bit information field, the

properly aligned 1010... pattern is

detected with fewer than four bit

errors (out of 84 possible) for 1024

consecutive information bit fields

(1.95ms) and all C bits are

majority decoded to be 0 during

this time.

In each 84-bit information field, the

properly aligned 1010... pattern is

detected with four or more bit errors

(out of 84 possible) for 1024

consecutive information bit fields

(1.95ms)

RUA1

Unframed All-Ones

Four or fewer 0s in two

consecutive 4760-bit frames

Five or more 0s in two consecutive

4760-bit frames

LOS

Loss of Signal

192 consecutive 0s

No EXZ events over a 192-bit

window that starts with the first 1

received

OOF

Out of Frame. Too many F bits or

M bits in error.

Three or more F bits in error out of

16 consecutive, or two or more M

bits in error out of four consecutive

No errors in six consecutive sets of

four F bits followed by two

consecutive frames with no M bits

errors, X bits matching and P bits

matching

SEF

Severely Errored Frame

Three or more F bits in error out of

16 consecutive F bits

In sync (OOF = 0) and fewer than

three F bits in error out of 16

consecutive F bits

RAI

Remote Alarm Indication (Also

referred to as SEF/AIS in

Bellcore GR-820.)

X1 = X2 = 0 (active)

X1 = X2 = 1 (inactive)

X1 = X2 = 0 for four consecutive

M-frames (426

ms)

X1 = X2 = 1 for four consecutive M-

frames (426

ms)

T3IDLE

DS3 Idle Signal. Properly framed

1100... pattern (starting with 11

after each overhead bit), the C

bits in M-subframe 3 set to 0

In each 84-bit information field, the

properly aligned 1100... pattern is

detected with fewer than four bit

errors (out of 84 possible) for 1024

consecutive information bit fields

(1.95ms), and the C bits in M-

subframe 3 are majority decoded

to be 0 during this time

In each 84-bit information field, the

properly aligned 1100... pattern is

detected with four or more bit errors

(out of 84 possible) for 1024

consecutive information bit fields

(1.95ms)

Table 7-F. E3 Alarm Criteria

ALARM/

CONDITION

FUNCTION

SET CRITERIA

CLEAR CRITERIA

AIS

Alarm Indication Signal.

Unframed all ones.

Four or fewer 0s in two

consecutive 1536-bit frames

Five or more 0s in two consecutive

1536-bit frames

RUA1

Unframed All Ones

Four or fewer 0s in two

consecutive 1536-bit frames

Five or more 0s in two consecutive

1536-bit frames

LOS

Loss of Signal

192 consecutive 0s

No EXZ events over a 192-bit

window that starts with the first 1

received

SEF

Severely Errored Frame

Same as OOF

OOF

Out of Frame. Too many FAS

errors.

Four consecutive bad FAS

Three consecutive good FAS

RAI

Remote Alarm Indication

Inactive: bit 11 of the frame = 0

Active: bit 11 of the frame = 1

Bit 11 = 1 for four consecutive

frames (6144 bits, 179

ms)

Bit 11 = 0 for four consecutive

frames (6144 bits, 179

ms)

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