Summary Of Specifications; Modulator - Comtech EF Data CDM-625A Installation And Operation Manual

CDM-625A Advanced Satellite Modem
Introduction
1.4

Summary of Specifications

1.4.1

Modulator

Modulation BPSK, QPSK, OQPSK, 8PSK, 8-QAM and 16-QAM
Symbol rate range 18 ksps to 12.5 Msps
Data rate range 18 kbps - 25 Mbps. See Section 1.4.7
Operating frequency 50 - 180 MHz (BNC connector) AND 950 - 2350 MHz (Type 'N' connector), 100 Hz resolution
Stability ±0.06 ppm (±6 x 10
Operating modes
• Open Network, per Intelsat IESS-308/309/310/314 (IDR, IBS/SMS)
• E1/T1 Drop and Insert
• Transparent, Closed Network, IESS-315 (VSAT Turbo)
• Proprietary EDMAC framed mode:
• 5% overhead – EDMAC (data rates < 2.048 Mbps all modes except BPSK Turbo, Rate 21/44 QPSK Turbo)
• 1.6% overhead - EDMAC-2 (rates >2.048 Mbps and all Rate 21/44, 5/16 Turbo)
• EDMAC-3 – for SNMP Proxy – same as EDMAC
• R-S Outer Codec
• Turbo Product Codec - 2
• LDPC Codec (optional plug-in module – includes all 2
• VersaFEC
• VersaFEC-2
• VersaFEC
• VersaFEC-2
• Automatic Uplink Power Control (AUPC) mode
• High Rate ESC, Enhanced ESC (ESC++)
• Enhanced Drop & Insert (D&I++)
• Quad E1 Drop & Insert (QDI) - concatenates time slots from up to four E1 G.703 streams, Framed QDI
• DoubleTalk® Carrier-in-Carrier® mode
• Carrier-in-Carrier Automatic Power Control (CnC-APC)
FEC None: Uncoded BPSK/QPSK/OQPSK
Viterbi: k=7, per IESS-308/309
BPSK: Rate 1/2
QPSK/OQPSK: Rate 1/2, Rate 3/4 and Rate 7/8
16-QAM: Rate 3/4 and Rate 7/8 (Viterbi plus Reed-Solomon only)
Sequential:
BPSK: Rate 1/2
QPSK/OQPSK: Rate 1/2, Rate 3/4 and Rate 7/8
Reed-Solomon (Open Network):
IDR modes:
225/205 for T1
219/201 for E1 and IESS-310 mode,
194/178 for T2 and E2
IBS modes:
126/112 and 219/201 for IESS-310 mode
Reed-Solomon (Closed Network):
220,200 outer code (transparent mode)
225,205 outer code (transparent mode, EF Data compatible, V.35 scrambling)
126,112 outer code (transparent mode, IBS parameters, D&I++ mode)
219,201 outer code (transparent mode, IESS-310 parameters)
200,180 outer code (EDMAC modes)
Interleaver depth = 4 or 8 (depending on mode)
8PSK/TCM Rate 2/3 (Trellis): Per IESS-310
Turbo Product Codec, 2
Rate 5/16 (2 dimensional) and Rate 21/44 (3-dimensional) BPSK
Rate 21/44 QPSK/OQPSK (aka 1/2) - 3 dimensional
Rate 3/4 QPSK/OQPSK/8PSK/8-QAM/16-QAM - 2 dimensional
Rate 7/8 QPSK/OQPSK/8PSK/8-QAM/16-QAM - 2 dimensional
Rate 0.95 QPSK/OQPSK/8PSK/8-QAM/- 2 dimensional TPC (exact Code Rate is actually 17/18, or 0.944)
) 0° to 50°C (32° to 122°F), when using internal reference
-8
Generation (optional plug-in module)
nd
Codec ( short-block, low latency and ultra-low-latency LDPC)
®
Codec (optional plug-in module, long-block, short-block)
®
Adaptive Coding and Modulation – IP interface only – maximum symbol rate = 4.1 Msps
®
Adaptive Coding and Modulation – IP interface only – maximum symbol rate = 12.5 Msps
®
Generation (Optional plug-in card, includes LDPC modes):
nd
1–13
Generation TPC modes)
nd
MN-CDM625A
Revision 4