PM5366-PI datasheet(199/267 Pages) PMC

199 / 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

187

E1 tributary asynchronous timing is compensated via the V3 octet. E1 tributary

link rate adjustments are optionally passed across the SBI via the V4 octet. E1

tributary alarm conditions are optionally passed across the SBI bus via the link

rate octet in the V4 location.

In synchronous mode the E1 tributary mapping is fixed to that shown in Table 29

and rate justifications are not possible using the V3 octet. The clock rate

information within the link rate octet in the V4 location is not used in synchronous

mode.

DS3 Tributary Mapping

Table 31 shows a DS3 tributary mapped within the first synchronous payload

envelope SPE1. The V5 indicator pulse identifies the V5 octet. The DS3 framing

format does not follow an 8KHz frame period so the floating DS3 multi-frame

located by the V5 indicator, shown in heavy border grey region in Table 31, will

jump around relative to the H1 frame on every pass. In fact the V5 indicator will

often be asserted twice per H1 frame, as is shown by the second V5 octet in

Table 31. The V5 indicator and payload signals indicate negative and positive

rate adjustments which are carried out by either putting a data byte in the H3

octet or leaving empty the octet after the H3 octet.

Table 31

- DS3 Framing Format

SPE

COL #

DS3

2-56

DS3

58-84

DS3

Col 85

ROW

SBI COL#

1,4,7,10

•••

184

•••

268

Unused

DS3

Unused

DS3

Unused

DS3

Unused Linkrate

DS3

Unused

DS3

Unused

DS3

Unused

DS3

Unused

DS3

Unused

DS3

Because the DS3 tributary rate is less than the rate of the grey region, padding

octets are interleaved with the DS3 tributary to make up the difference in rate.

Interleaved with every DS3 multi-frame are 35 stuff octets, one of which is the

V5 octet. These 35 stuff octets are spread evenly across seven DS3 subframes.

Each DS3 subframe is eight blocks of 85 bits. The 85 bits making up a DS3

block are padded out to be 11 octets. Table 32 shows the DS3 block 11 octet

format where R indicates a stuff bit, F indicates a DS3 framing bit and I indicates

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