PM5366-PI datasheet(84/267 Pages) PMC

84 / 267 page

PRELIMINARY

PM5366 TEMAP-84

DATASHEET

PMC-2010672

ISSUE 1

HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER

AND M13 MULTIPLEXER

PROPRIETARY AND CONFIDENTIAL

optionally set to either halt searching for CRC multiframe altogether, or may

continue searching for CRC multiframe alignment using the established basic

frame alignment. In either case, no further adjustments are made to the basic

frame alignment, and no offline searches for basic frame alignment occur once

CRC-to-non-CRC interworking is declared: it is assumed that the established

basic frame alignment at this point is correct.

AIS Detection

When an unframed all-ones receive data stream is received, an AIS defect is

indicated by setting the AISD context bit to logic 1 when fewer than three zero

bits are received in 512 consecutive bits or, optionally, in each of two consecutive

periods of 512 bits. The AISD bit is reset to logic 0 when three or more zeros in

512 consecutive bits or in each of two consecutive periods of 512 bits. Finding

frame alignment will also cause the AISD bit to be set to logic 0.

E1 Alarm Integration

The OOF and the AIS defects are integrated, verifying that each condition has

persisted for 104 ms (± 6 ms) before indicating the alarm condition. The alarm is

removed when the condition has been absent for 104 ms (± 6 ms).

The AIS alarm algorithm accumulates the occurrences of AISD (AIS detection).

The E1 framer counts the occurrences of AISD over a 4 ms interval and indicates

a valid AIS is present when 13 or more AISD indications (of a possible 16) have

been received. Each interval with a valid AIS presence indication increments an

interval counter which declares AIS Alarm when 25 valid intervals have been

accumulated. An interval with no valid AIS presence indication decrements the

interval counter. The AIS Alarm declaration is removed when the counter

reaches 0. This algorithm provides a 99.8% probability of declaring an AIS Alarm

within 104 ms in the presence of a 10-3 mean bit error rate.

The Red alarm algorithm monitors occurrences of out of frame (OOF) over a

4 ms interval, indicating a valid OOF interval when one or more OOF indications

occurred during the interval, and indicating a valid in frame (INF) interval when

no OOF indication occurred for the entire interval. Each interval with a valid OOF

indication increments an interval counter which declares Red Alarm when 25

valid intervals have been accumulated. An interval with valid INF indication

decrements the interval counter; the Red Alarm declaration is removed when the

counter reaches 0. This algorithm biases OOF occurrences, leading to

declaration of Red alarm when intermittent loss of frame alignment occurs.

The E1 framer can also be disabled to allow reception of unframed data.

PM5366-PI Datasheet(PDF) 84 Page - PMC-Sierra, Inc

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