PM5366-PI datasheet(103/267 Pages) PMC

103 / 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

• the General Purpose Communication Channel byte for processing by the HDLC

receiver when the RNETOP bit in the E3 Data Link Control register is logic 0.

In G.751 E3 mode, the E3-FRMR extracts:

• the Remote Alarm Indication bit (bit 11 of the frame) and indicates a Remote

Alarm when the RAI bit is a logic 1 for 3 or 5 consecutive frames. Similarly, the

Remote Alarm is removed when the RAI bit is logic 0 for 3 or 5 consecutive

frames;

• the National Use reserved bit (bit 12 of the frame) for further processing in the

HDLC receiver when the RNETOP bit in the E3 Data Link Control register is logic

0. Optionally, an interrupt can be generated when the National Use bit changes

state.

The E3-FRMR declares out of frame alignment if the framing pattern is in error

for four consecutive frames. The E3-FRMR is an "off-line" framer, where all

frame alignment indications, all overhead bit indications, and all overhead bit

processing continue based on the previous alignment. Once the framer has

determined the new frame alignment, the out-of-frame indication is removed and

a COFA indication is declared if the new alignment differs from the previous

alignment.

The E3-FRMR detects the presence of AIS in the incoming data stream when

less than 8 zeros in a frame are detected while the framer is OOF in G.832

mode, or when less than 5 zeros in a frame are detected while OOF in G.751

mode. This algorithm provides a probability of detecting AIS within a single

frame in the presence of a 10-3 BER as 92.9% in G.832 and 98.0% in G.751.

After five frames, the probability of detection rises to >99.999% for both formats.

Loss of signal is LOS is declared when no marks have been received for 32

consecutive bit periods. Loss of signal is de-asserted after 32 bit periods during

which there is no sequence of four consecutive zeros.

E3 Loss of Frame detection is provided as recommended by ITU-T G.783 with

programmable integration periods of 1ms, 2ms, or 3ms. While integrating up to

assert LOF, the counter will integrate up when the framer asserts an Out of

Frame condition and integrates down when the framer de-asserts the Out of

Frame condition. Once an LOF is asserted, the framer must not assert OOF for

the entire integration period before LOF is de-asserted.

The E3-FRMR can also be enabled to automatically assert the RAI/FERF

indication in the outgoing transmit stream upon detection of any combination of

PM5366-PI Datasheet(PDF) 103 Page - PMC-Sierra, Inc

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