PM5366-PI datasheet(108/267 Pages) PMC

108 / 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

9.22.4 Pointer Generator

1. The pointer generator block generates the tributary pointers (V1/V2) as

specified in the references. The pointer value is used to determine the

location of the tributary path overhead byte (V5) on the outgoing stream.

The pointer generator is a time-sliced state machine that can process up to 28

independent tributaries. The state vector is saved in RAM at the address

associated with the current tributary. The pointer generator fills the outgoing

tributary synchronous payload envelopes with bytes read from the associated

FIFO in the payload buffer for the current tributary. The pointer generator

creates pointers in the V1-V3 bytes of the outgoing data stream. The marker

that tags the V5 byte that is passed through the payload buffer is used to align

the pointer. The outgoing timing generator directs the pointer generator to the

FIFO in the payload buffer that is associated with the tributary being processed.

The pointer generator monitors the fill levels of the payload buffers and inserts

outgoing pointer justifications as necessary to avoid FIFO spillage. Normally, the

pointer generator has a FIFO dead band of two bytes. The dead band can be

collapse to one so that any incoming pointer justifications will be reflected by a

corresponding outgoing justification with no attenuation. Signals are output by

the pointer generator that identify outgoing V5 bytes and the tributary

synchronous payload envelopes. On a per tributary basis, tributary path AIS and

tributary idle (unequipped) can be inserted as controlled by microprocessor

accessible registers. The idle code is selectable globally for the entire VC3 or

TUG3 to be all-zeros or all-ones. It is also possible to force an inverted new data

flag on individual tributaries for the purpose of diagnosing downstream pointer

processors. Tributary path AIS is automatically inserted into outgoing tributaries

if the pointer interpreter detects tributary path AIS on the corresponding incoming

tributary.

9.23 Receive Tributary Path Overhead Processor (RTOP)

Each one of three tributary path overhead processors (RTOP) monitors the

outgoing stream of the tributary payload processor (VTPP) and processes the

tributaries within an STS-1, AU3, or TUG3. The RTOP can be configured to

process all the VT1.5s or VT2s that can be carried in an STS-1 or all the TU11s

or TU12s that can be carried in an AU3 or TUG3. The number of tributaries

managed by each RTOP ranges from 21 (when configured to process all VT2s or

all TU12s) to 28 (when configured to process all VT1.5s or all TU11s).

The RTOP provides tributary performance monitoring of incoming tributaries. Bit

interleaved parity of the incoming tributaries is computed and compared with the

BIP-2 code encoded in the V5 byte of the tributary. Errors between the

computed and received values are accumulated. RTOP also accumulates far

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