PM5366-PI PMC-Sierra, Inc., PM5366-PI Datasheet - Page 199
PM5366-PI
Manufacturer Part Number
PM5366-PI
Description
HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER AND M13 MULTIPLEXER
Manufacturer
PMC-Sierra, Inc.
Datasheet
1.PM5366-PI.pdf
(267 pages)
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DATASHEET
PMC-2010672
PROPRIETARY AND CONFIDENTIAL
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
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
ROW
1
2
3
4
5
6
7
8
9
SBI COL#
1,4,7,10
Unused
Unused
Unused
Unused Linkrate
Unused
Unused
Unused
Unused
Unused
COL #
SPE
- DS3 Framing Format
Unused
Unused
Unused
Unused
Unused
H1
H2
H3
13
ISSUE 1
DS3
DS3
DS3
DS3
DS3
DS3
DS3
DS3
DS3
V5
16
1
DS3
2-56
DS3
DS3
DS3
DS3
DS3
DS3
DS3
DS3
DS3
•••
•••
•••
•••
187
DS3
DS3
DS3
DS3
DS3
DS3
DS3
DS3
DS3
184
V5
57
58-84
DS3
DS3
DS3
DS3
DS3
DS3
DS3
DS3
DS3
DS3
•••
•••
•••
•••
HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER
Col 85
DS3
DS3
DS3
DS3
DS3
DS3
DS3
DS3
DS3
DS3
268
AND M13 MULTIPLEXER
PM5366 TEMAP-84
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