PM5366-PI datasheet(116/267 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

104

Given a path signal label mismatch (PSLM) or path signal label unstable (PSLU),

the D3MD ignores the STS-1 (STM-0/AU3) SPE and writes a DS3 AIS pattern to

the elastic store. In addition, the desynchronization algorithm assumes a nominal

ratio of data to stuff bits carried in the S bits (1 out of 3 S bits is assumed to be

an information (data) bit). DS3 AIS is shown in Table 6.

Table 6

- DS3 AIS format.

X (1)

F (1)

C (0)

F (0)

C (0)

F (0)

C (0)

F (1)

X (1)

F (1)

C (0)

F (0)

C (0)

F (0)

C (0)

F (1)

P (p)

F (1)

C (0)

F (0)

C (0)

F (0)

C (0)

F (1)

P (p)

F (1)

C (0)

F (0)

C (0)

F (0)

C (0)

F (1)

M (0)

F (1)

C (0)

F (0)

C (0)

F (0)

C (0)

F (1)

(1)

F (1)

C (0)

F (0)

C (0)

F (0)

C (0)

F (1)

(0)

F (1)

C (0)

F (0)

C (0)

F (0)

C (0)

F (1)

• valid M-frame alignment bits (M-bits), M-subframe alignment bits (F-bits), and

parity bit of the preceding M-frame (P-bits). The two P-bits are identical, either

both are zeros or ones.

• all the C-bits in the M-frame are set to zeros

• the X-bits are set to ones

• the information bit (84 Data bits with repeating sequence of 1010..)

9.27.2 DS3 Demapper Elastic Store

The elastic store block is provided to compensate for frequency differences

between the DS-3 stream extracted from the STS-1 (STM-0/AU3) SPE and the

CLK52M clock input. The DS3 Demapper extracts I bits from the STS-1

(STM-0/AU3) SPE and writes the bits into a 128 bit (16 byte) elastic store. Eight

bytes are provided for SONET/SDH overhead (3 bytes for TOH, 1 byte for a

positive stuff, 1 byte for POH) and DS3 reserve stuffing bits (2 bytes for R bits,

and 3 overhead bits which is rounded-up to 1 byte). The remaining 8 bytes are

provided for path pointer adjustments.

Data is read out of the Elastic Store using a divide by 8 version of the input

CLK52M clock. If an overflow or underflow condition occurs, an interrupt is

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