PM8611-BIAP PMC [PMC-Sierra, Inc], PM8611-BIAP Datasheet - Page 46

• Manufacturer Part Number: PM8611-BIAP
• Manufacturer: PMC [PMC-Sierra, Inc]

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-2010883, Issue 2
Table 12 DS3 Framing Format
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 13 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 14 shows the DS3 multi-frame format that is packed into the grey region
of Table 12. 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 14 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 13 DS3 Block Format
Table 14 DS3 Multi-frame Stuffing Format
ROW
1
2
3
4
5
6
7
8
9
Octet #
Data
V5
V5
V5
V5
V5
V5
4*R
4*R
4*R
4*R
4*R
5*R
SPE
COL #
SBI
COL#
1,4,7,10
Unused H1
Unused H2
Unused H3
Unused Linkrat
Unused Unused DS3
Unused Unused DS3
Unused Unused DS3
Unused Unused DS3
Unused Unused DS3
1
RRRFIIII
8*B
8*B
8*B
8*B
8*B
8*B
13
e
5*R
5*R
5*R
5*R
5*R
5*R
DS3
1
16
V5
DS3
DS3
DS3
2
8*I
8*B
8*B
8*B
8*B
8*B
8*B
3
8*I
5*R
5*R
5*R
5*R
5*R
5*R
DS3
2-56
DS3
DS3
DS3
DS3
DS3
DS3
DS3
DS3
DS3
8*I
4
8*B
8*B
8*B
8*B
8*B
8*B
DS3
57
184
DS3
DS3
DS3
DS3
DS3
DS3
DS3
V5
DS3
5
8*I
5*R
5*R
5*R
5*R
5*R
5*R
SBSLITE™ Telecom Standard Product Data Sheet
6
8*I
8*B
8*B
8*B
8*B
8*B
8*B
DS3
58-84
DS3
DS3
DS3
DS3
DS3
DS3
DS3
DS3
DS3
7
8*I
5*R
5*R
5*R
5*R
5*R
5*R
DS3
Col 85
268
DS3
DS3
DS3
DS3
DS3
DS3
DS3
DS3
DS3
8
8*I
8*B
8*B
8*B
8*B
8*B
8*B
9
8*I
5*R
5*R
5*R
5*R
5*R
5*R
10
8*I
8*B
8*B
8*B
8*B
8*B
8*B
11
8*I
5*R
5*R
5*R
5*R
5*R
5*R
Preliminary
8*B
8*B
8*B
8*B
8*B
8*B
45