PM5366 datasheet(79/267 Pages) PMC

79 / 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

CI is cleared upon deassertion of RAI or upon 28 consecutive 40ms intervals

without validation of “00111110 11111111”.

By definition, AIS-CI is a repetitive pattern of 1.26 seconds. It consists of 1.11

seconds of an unframed all ones pattern and 0.15 seconds of all ones modified

by the AIS-CI signature. The AIS-CI signature is a repetitive pattern 6176 bits in

length in which, if the first bit is numbered bit 0, bits 3088, 3474 and 5790 are

logical zeros and all other bits in the pattern are logical ones. AIS-CI is an

unframed pattern, so it is defined for all framing formats.

AIS-CI is declared between 1.40 and 2.56 seconds after initiation of the AIS-CI

signal and is deasserted 16.6 seconds after it ceases.

9.4 E1 Performance Monitoring

E1 framing can be performed on up to three sets of 21 tributaries for the purpose

of performance monitoring. The ingress or egress path may be monitored, as

selected on an indiividual tributary basis.

The E1 framing function searches for basic frame alignment, CRC multiframe

alignment, and channel associated signaling (CAS) multiframe alignment in the

incoming recovered PCM stream.

Once basic (or FAS) frame alignment has been found, the incoming PCM data

stream is continuously monitored for FAS/NFAS framing bit errors, which are

accumulated in a framing bit error counter dedicated to each tributary. Once

CRC multiframe alignment has been found, the PCM data stream is continuously

monitored for CRC multiframe alignment pattern errors and CRC-4 errors, which

are accumulated in a CRC error counter dedicated to each tributary. Once CAS

multiframe alignment has been found, the PCM data is continuously monitored

for CAS multiframe alignment pattern errors. The E1 framer also detects and

indicates loss of basic frame, loss of CRC multiframe, and loss of CAS

multiframe, based on user-selectable criteria. The reframe operation can be

initiated by software, by excessive CRC errors, or when CRC multiframe

alignment is not found within 400 ms.

The E1 framer extracts the contents of the International bits (from both the FAS

frames and the NFAS frames), the National bits, and the Extra bits (from timeslot

16 of frame 0 of the CAS multiframe). Moreover, the framer also extracts

submultiframe-aligned 4-bit codewords from each of the National bit positions

Sa4 to Sa8, and stores them in microprocessor-accessible registers that are

updated every CRC submultiframe.

The E1 framer identifies the raw bit values for the Remote (or distant frame)

Alarm (bit 3 in timeslot 0 of NFAS frames) and the Remote Signaling Multiframe

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