Comtech EF Data RCS10 User Manual
Page 242
DMD10 Drop and Insert
Terrestrial Data:
T1 (1.544 Mbps) or E1 (2.048 Mbps) G.732/733 format
Line Coding:
AMI or B8ZS for T1 and HDB3 for E1
Framing:
D4 or ESF for T1 and PMC30 (30 channels) or PMC31 (31 channels) for
E1
Time Slot Selection:
n x 64 contiguous or arbitrary blocks for Drop or Insert; Drop TS16.
Data Rates:
64, 128, 256, 384, 512, 768, 1024, 1,536, and 1,920 Kbps
Reed-Solomon Codec
An optional Intelsat-compliant Reed-Solomon codec is available for the DMD10 modem. The
composite data rate Eb/No, performance for Reed-Solomon outer coding with inner convolutional
encoding and Viterbi decoding is:
BER vs. Eb/No Guaranteed Performance
Rate 1/2 FEC Rate 3/4 FEC
10
-6
4.1
5.6
10
-7
4.2
5.8
10
-8
4.4
6.0
10
-10
5.0
6.3
External Clock Distribution Module
The clock distribution module has one clock input and nine clock driver outputs that are distributed
to the DMD10 modem modules.
Input:
BNC
Clock Rates:
256 KHz to 10 MHz, in 8 KHz steps, normally set at 1.0, 1.544, 2.048.
5.0, or 10 MHz.
The external reference module has one IF reference input that is distributed to DMD10 modems
Input:
BNC
Frequencies:
1, 5, 10, 20 MHz
Internal High Stability Clock
Internal High Stability Clock: Optional 10
-7
Terrestrial Interfaces