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STANDARD PRODUCT
PM8315 TEMUX
DATASHEET
PMC-1981125
ISSUE 7
HIGH DENSITY T1/E1 FRAMER WITH
INTEGRATED VT/TU MAPPER AND M13 MUX
PROPRIETARY AND CONFIDENTIAL
225
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 30
- DS3 Framing Format
SPE
COL #
DS3
1
DS3
2-56
DS3
57
DS3
58-84
DS3
Col 85
ROW
SBI COL#
1,4,7,10
13
16
184
268
1
Unused
H1
V5
DS3
DS3
DS3
DS3
2
Unused
H2
DS3
DS3
DS3
DS3
DS3
3
Unused
H3
DS3
DS3
DS3
DS3
DS3
4
Unused
Linkrate
DS3
DS3
DS3
DS3
DS3
5
Unused
Unused
DS3
DS3
DS3
DS3
DS3
6
Unused
Unused
DS3
DS3
DS3
DS3
DS3
7
Unused
Unused
DS3
DS3
DS3
DS3
DS3
8
Unused
Unused
DS3
DS3
V5
DS3
DS3
9
Unused
Unused
DS3
DS3
DS3
DS3
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 31 shows the DS3 block 11 octet
format where R indicates a stuff bit, F indicates a DS3 framing bit and I indicates
DS3 information bits. Table 32 shows the DS3 multi-frame format that is packed
into the grey region of Table 30. In this table V5 indicates the V5 octet which is
also a stuff octet, R indicates a stuff octet and B indicates the 11 octet DS3
block. Each row in Table 32 is a DS3 multi-frame. The DS3 multi-frame stuffing
format is identical for 5 multi-frames and then an extra stuff octet after the V5
octet is added every sixth frame.
Table 31
- DS3 Block Format
Octet #
1
2
3
4
5
6
7
8
9
10
11
Data
RRRFIIII
8*I
8*I
8*I
8*I
8*I
8*I
8*I
8*I
8*I
8*I