Specifications

Introduction
MP2100M-LS-2 Modules - Installation and Operation Manual 1-13
Envelope No.
7 8 10 11 12 13 14 15 16 17 18 19 2091 2 3 4 5 6 7 8 10 11 12 13 14 15 16 17 18 19 209 1 2 3 4 5 6 7 8 10 11 12 13 14 15 16 17 18 19 209 1
. . .
2.4 kbps
Channel
(1 Envelope
Out of 20)
7 8 10 11 12 13 14 15 16 17 18 19 2091 2 3 4 5 6 7 8 10 11 12 13 14 15 16 17 18 19 209 1 2 3 4 5 6 7 8 10 11 12 13 14 15 16 17 18 19 209 1
. . .
4.8 kbps
Channel
(2 Envelopes
Out of 20)
9.6 kbps
Channel
(4 Envelopes
Out of 20)
19.2 kbps
Channel
(8 Envelopes
Out of 20)
7 8 10 11 12 13 14 15 16 17 18 19 2091 2 3 4 5 6 7 8 10 11 12 13 14 15 16 17 18 19 209 1 2 3 4 5 6 7 8 10 11 12 13 14 15 16 17 18 19 209 1
. . .
7 8 10 11 12 13 14 15 16 17 18 19 2091 2 3 4 5 6 7 8 10 11 12 13 14 15 16 17 18 19 209 1 2 3 4 5 6 7 8 10 11 12 13 14 15 16 17 18 19 209 1
. . .
7 8 10 11 12 13 14 15 16 17 18 19 2091 2 3 4 5 6 7 8 10 11 12 13 14 15 16 17 18 19 209 1 2 3 4 5 6 7 8 10 11 12 13 14 15 16 17 18 19 209 1
. . .
Figure 1-9. Multiplexed Signal Structures
In accordance with the byte-interleaved multiplexing principles:
• A 2.4 kbps user channel uses one envelope out of every 20, and thus
appears once per structure.
• A 4.8 kbps user channel uses two envelopes out of every 20, and thus
appears twice per structure.
• A 9.6 kbps user channel uses four envelopes out of every 20, and thus
appears four times per structure.
• A 19.2 kbps user channel uses eight envelopes out of every 20, and thus
appears eight times per structure. Note that the envelopes are assigned in
pairs.
Note that a /2TS module can handle two independent byte-interleaved
multiplexing structures.
ITU-T Rec. X.58 Multiplexing Format
The multiplexing format specified by ITU-T Rec. X.58 based on a repetitive
structure of 80 envelopes, organized in four substructures of 20 envelopes. In
each substructure, two envelopes are assigned to framing and housekeeping.
The remaining 18 envelopes carry only user data. Therefore this multiplexing
format has a bandwidth efficiency of 90%, for a maximum user payload of
57.6 kbps, i.e., the sum of the data rates of all the user's channels connected to
the LS-2/X.58 must not exceed 57.6 kbps.
Figure 1-10 shows the structure of the ITU-T Rec. X.58 signal. To facilitate the
understanding of the signal structure, the envelopes assigned to user data are
identified by letters A through F, followed by a numeral.