PM5366-PI datasheet(80/267 Pages) PMC

80 / 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

(or distant multiframe) Alarm (bit 6 of timeslot 16 of frame 0 of the CAS

multiframe). Access is also provided to the "debounced" remote alarm and

remote signaling multiframe alarm bits which are set when the corresponding

signals have been a logic 1 for 4 (provided the RAIC bit is logic 1) and 3

consecutive occurrences, respectively, as per Recommendation O.162.

Detection of AIS and timeslot 16 AIS are provided. AIS is also integrated, and an

AIS Alarm is indicated if the AIS condition has persisted for at least 100 ms. The

out of frame (OOF=1) condition is also integrated, indicating a Red Alarm if the

OOF condition has persisted for at least 100 ms.

An interrupt may be generated to signal a change in the state of any status bits

(INF, INSMF, INCMF, AIS or RED), and to signal when any event (RAI, RMAI,

AISD, TS16AISD, COFA, FER, SMFER, CMFER, CRCE or FEBE) has occurred.

Additionally, interrupts may be generated every frame, CRC submultiframe, CRC

multiframe or signaling multiframe.

Basic Frame Alignment Procedure

The E1 framer searches for basic frame alignment using the algorithm defined in

ITU-T Recommendation G.706 sections 4.1.2 and 4.2.

The algorithm finds frame alignment by using the following sequence:

1. Search for the presence of the correct 7-bit FAS (‘0011011’);

2. Check that the FAS is absent in the following frame by verifying that bit 2 of

the assumed non-frame alignment sequence (NFAS) TS 0 byte is a logic 1;

3. Check that the correct 7-bit FAS is present in the assumed TS 0 byte of the

next frame.

If either of the conditions in steps 2 or 3 are not met, a new search for frame

alignment is initiated in the bit immediately following the second 7-bit FAS

sequence check. This "hold-off" is done to ensure that new frame alignment

searches are done in the next bit position, modulo 512. This facilitates the

discovery of the correct frame alignment, even in the presence of fixed timeslot

data imitating the FAS.

The algorithm provides robust framing operation even in the presence of random

bit errors; the algorithm provides a 99.98% probability of finding frame alignment

within 1 ms in the presence of 10-3 bit error rate and no mimic patterns.

Once frame alignment is found, the INF context bit is set to logic 1, a change of

frame alignment is indicated (if it occurred), and the frame alignment signal is

monitored for errors occurring in the 7-bit FAS pattern and in bit 2 of NFAS

PM5366-PI Datasheet(PDF) 80 Page - PMC-Sierra, Inc

PM5366-PI Datasheet(HTML) 80 Page - PMC-Sierra, Inc

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