PM5366-PI datasheet(118/267 Pages) PMC

118 / 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

106

Table 7

- DS3 desynchronizer clock gapping algorithm.

Row Number

Normal or DS3 AIS

Run Faster

Run Slower

621

622

621

622

621

622

621

622

621

622

621

9.28 Transmit Tributary Path Overhead Processor (TTOP)

Each one of three Transmit Tributary Path Overhead Processors (TTOP)

generates the path overhead for up to 28 VT1.5/TU-11s or 21 VT2/TU-12s.

When configured for SONET compatible operation, the TTOP inserts the four

tributary path overhead bytes (V5, J2, Z6, and Z7) to each tributary. The TTOP

may also be configured for SDH compatible operation. The incoming STM-1

stream may carry three AU3s or an AU4 with three TUG3s.

The TTOP computes the BIP-2 code in the current tributary SPE and inserts the

result into the BIP-2 bits of the V5 byte in the next tributary SPE. The tributary

path signal label in the V5 byte of each tributary can be sourced from internal

registers. The tributary far end block error bit in the V5 byte of each tributary is

inserted based of the BIP error count detected at a companion RTOP block. The

tributary remote failure indication and remote defect indication bits in the V5 or

the Z7 byte of each tributary is inserted based on the tributary alarm status of the

companion RTOP TSB.

The TTOP inserts the tributary trail trace identifier (TTI) into the J2 byte. Each

tributary is provided with a 64-byte buffer to store the identifier. To transmit a 16-

byte message, one must write four identical copies to the buffer. One shadow

buffer is available for temporary replacement of a selected transmitted TTI while

the 64-byte identifier buffer is being updated. Data is retrieved sequentially from

the active buffer at each J2 byte position. No CRC insertion is performed; any

CRC must be written into the trail trace buffer. The shadow buffer can be

programmed with new messages without timing constraints when inactive. An

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