Specifications

Introduction
MP2100M-LS-2 Modules - Installation and Operation Manual 1-15
control bit, which indicates the information carried by each byte:
0 Control data
1 User data
• The first bit is used exclusively as a framing bit. The length of the frame
synchronization sequence depends on the highest required channel data rate
as shown in Table 1-3.
Table 1-3. Frame Synchronization Sequence Length
Highest Channel Data Rate Frame Synchronization Sequence Length
2.4 kbps 20 bits
4.8 kbps 10 bits
9.6 kbps 5 bits
19.2 kbps 5 bits
Since the number of bytes contained in the repetitive frame structure depends
on the length of the frame synchronization sequence, the multiplexing
capabilities are determined by the highest user data rate that must be carried.
The combinations that achieve maximal utilization of the available bandwidth
are detailed in Tables 1-4, 1-5 and 1-6.
Table 1-4. /SDM Version, Channel Availability for Highest User Rate of
19.2 kbps
Number of Envelopes
Number of User Channels vs. Data Rate
in Structure
19.2 kbps 9.6 kbps 4.8 kbps 2.4 kbps
5 2 1 – –
2 – 1 –
2 – – 1
1 3 – –
1 2 1 –
1 2 – 1
1 1 2 –
1 1 1 1
1 1 – 2
1 – 3 –
1 – 2 1
1 – 1 2
1 – – 3