Chapter 14. Summary Of Specifications; Modulator - Comtech EF Data CDM-550T Manual

14.1

MODULATOR

Modulation BPSK, QPSK, and Offset QPSK
Overall, 2.4 - 2048 kbps
Data rate range
4.8 kbps - 2048 kbps, Uncoded BPSK
9.6 kbps - 2048 kbps, Uncoded QPSK/OQPSK
2.4 kbps - 1024 kbps, Rate 1/2 BPSK
4.8 kbps - 2048 kbps, Rate 1/2 QPSK/OQPSK
7.2 kbps - 2048 kbps, Rate 3/4 QPSK/OQPSK
8.4 kbps - 2048 kbps, Rate 7/8 QPSK/OQPSK
2.4 kbps - 1145 kbps, Rate 21/44 BPSK Turbo
2.4 kbps - 750 kbps, Rate 5/16 BPSK Turbo
Operating modes Transparent, Closed Network
Proprietary EDMAC framed mode:
* 5% overhead addition - all modes except BPSK Turbo
* 1.5% overhead addition - Rate 21/44 and 5/16 Turbo
RS Outer Codec (optional)
Turbo Product Codec (optional):
* Rate 3/4 QPSK/OQPSK
* Rate 21/44 BPSK
* Rate 5/16 BPSK
Automatic Uplink Power Contol (AUPC) mode
Transmit filtering Per INTELSAT IESS 308 (64 to 512 tap FIR digital filter implementation)
Scrambling Transparent mode, no RS coding - per CCITT V.35
EDMAC mode, no RS coding - externally synchronized
Turbo Product Code mode - externally synchronized
All RS modes - externally synchronized per IESS 308
Rev. 1.3
14
Chapter 14.
SUMMARY OF
SPECIFICATIONS
14–1