Comtech EF Data CDM-550T - Manual (Page 114)

CDM-550T Satellite Modem Revision 3
Summary Of Specifications MN/CDM550T.IOM
TURBO PRODUCT CODEC BER
(With two adjacent carriers, each
7 dB higher than desired)
For:
BER=10-6
BER=10-7
BER=10-8 Rate 3/4 (Q)
Guaranteed Eb/No:
(typical value in
parentheses)
3.9dB (3.5dB)
4.1dB (3.7dB)
4.3dB (4.0dB) Rate 21/44 (B) / ½ (Q)
Guaranteed Eb/No:
(typical value in
parentheses)
2.8dB (2.5dB)
3.1dB (2.8dB)
3.3dB (3.0dB) Rate 5/16 (B)
Guaranteed Eb/No:
(typical value in
parentheses)
2.3dB (2.0dB)
2.6dB (2.3dB)
2.8dB (2.5dB)
Buffer •
Plesiochronous/Doppler buffer with selectable size of 512, 1024, 2048,
4096 or 8192 bits
•
Supports asymmetric operation - when buffer is clocked from Tx clock, Rx
and Tx rates do not need to be identical
Monitor Functions • Eb/No
estimate
•
Corrected Bit Error Rate
• Frequency
offset
•
Buffer fill state
•
Coarse AGC voltage
14.3 Automatic Uplink Power Control
Operating Mode Requires Framed mode for transport of Eb/No information from remote modem
(EDMAC can be enabled or disabled)
Target Eb/No range 0 to 9.9 dB at remote demod (default is 3.0 dB)
Max AUPC range 0 to 9 dB (default is 1 dB)
Monitor functions Remote demod Eb/No
Tx power level increase
(front panel or via remote control interface)
14.4 Data Interfaces
Built in RS-422/RS-530 DCE (also supports X.21 DCE and DTE)
V.35 DCE
Synchronous RS-232
Asynchronous RS-232 (maximum data rate: 56 kbaud)
(Front panel selectable)
Pinout Per RS-530 (25 pin ‘D’ type female)
Optional G.703 T1/E1 plug-on interface (Comtech EF Data P/N: CIC-50)
14–4