PM5366-PI datasheet(78/267 Pages) PMC

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PRELIMINARY

PM5366 TEMAP-84

DATASHEET

PMC-2010672

ISSUE 1

HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER

AND M13 MULTIPLEXER

PROPRIETARY AND CONFIDENTIAL

T1.403 and in TR-TSY-000194. The 64

th code (111111) is similar to the HDLC

flag sequence and is used to indicate no valid code received.

Bit oriented codes are received on the Facility Data Link channel as a 16-bit

sequence consisting of 8 ones, a zero, 6 code bits, and a trailing zero

(111111110xxxxxx0). The receiver declares a received code valid if it has been

observed for two consecutive times The code is declared removed if two code

sequences containing code values different from the detected code are received

two consecutive times.

Valid BOC are indicated through the BOCI status bit The BOC bits are set to all

ones (111111) if no valid code has been detected. An interrupt is generated to

signal when a detected code has been validated, or optionally, when a valid code

goes away (i.e. the BOC bits go to all ones).

9.3.3 T1 Alarm Integration

The presence of Yellow, Red, and AIS Carrier Fail Alarms (CFA) in SF, SLC

96

or ESF formats is detected and integrated in accordance with the specifications

defined in ANSI T1.403 and TR-TSY-000191.

The presence of Yellow alarm is declared when the Yellow pattern has been

received for 425 ms (± 50 ms); the Yellow alarm is removed when the Yellow

pattern has been absent for 425 ms (± 50 ms). The presence of Red alarm is

declared when an out-of-frame condition has been present for 2.55 sec (± 40

ms); the Red alarm is removed when the out-of-frame condition has been absent

for 16.6 sec (± 500 ms). The presence of AIS alarm is declared when an out-of-

frame condition and all-ones in the PCM data stream have been present for 2.55

sec (±40 ms); the AIS alarm is removed when the AIS condition has been absent

for 16.6 sec (±500 ms).

CFA alarm detection algorithms operate in the presence of a 10-3 bit error rate.

9.3.3.1 Customer Interface Alarms

The RAI-CI and AIS-CI alarms defined in T1.403 are detected reliably.

By definition, RAI-CI is a repetitive pattern within the ESF data link with a period

of 1.08 seconds. It consists of sequentially interleaving 0.99 seconds of

00000000 11111111 (right-to-left) with 90 ms of 00111110 11111111.

RAI-CI is declared when a bit oriented code of “00111110 11111111” is validated

(i.e. two consecutive patterns) while RAI (a.k.a. Yellow alarm) is declared. RAI-

PM5366-PI Datasheet(PDF) 78 Page - PMC-Sierra, Inc

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