PM5366-PI PMC-Sierra, Inc., PM5366-PI Datasheet - Page 161

• Manufacturer Part Number: PM5366-PI
• Description: HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER AND M13 MULTIPLEXER
• Manufacturer: PMC-Sierra, Inc.

PRELIMINARY
DATASHEET
PMC-2010672
12
12.1 Tributary Indexing
PROPRIETARY AND CONFIDENTIAL
OPERATION
The TEMUX-84 is capable of transporting 84 1.544 Mbit/s (T1) or 63 2.048
Mbit/s (E1) tributaries. This section explains the correspondence between the
indexing systems of the various mapping and multiplexing formats: SBI Bus,
Telecom Bus and M13. The listed index systems are used throughout the
document.
The SBI Bus tributary designation uses two integers: the first represents the byte
interleaved SPE number (range 1 to 3) and the second is the link index within the
SPE (range 1 to 28).
The Telecom Bus indexing follows the conventions of the ITU-T multiplexing
structure. The bandwidth is divided into three TUG-3s numbered 1 through 3,
each of which is composed of seven TUG-2s numbered 1 through 7, each of
which is composed of either three TU-12s numbered 1 through 3 or four TU-11s
numbered 1 through 4.
The three DS3s are divided into seven DS2s, each of which is composed of
either four 1.544 Mbit/s or three 2.048 Mbit/s tributaries.
The payload capacity is divided into three equal portions. Each of the following
lists represents one set of equivalent tributaries:
Table 13 and Table 14 provide the equivalencies between the various multiplex
and mapping formats. Alternately, the formats can be equated with the following
formulae:
1.544Mbit/s SBI LINK #
2.048Mbit/s SBI LINK #
• SPE #1, TUG-3 #1 and DS3 #1
• SPE #2, TUG-3 #2 and DS3 #2
• SPE #3, TUG-3 #3 and DS3 #3
ISSUE 1
= 7*(TU11-1) + TUG2
= 4*(DS2-1)+DS1
= 7*(TU12-1) + TUG2
= 3*(DS2-1)+E1
149
HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER
AND M13 MULTIPLEXER
PM5366 TEMAP-84