Comtech EF Data CDM-425, Installation And Operation Manual

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CDM-425 Advanced Satellite Modem
Revision 0
Introduction 1–14 MN-CDM-425
1.4 Summary of Specifications
1.4.1 Modulator
Modulation BPSK, QPSK, 8-QAM, , 8-ARY, 16-QAM, 16-ARY, and 32-ARY
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 - 2250 MHz (Type ‘N’ connector), 100 Hz resolution
Stability ±0.06 ppm (±6 x 10
-8
) 0° to 50°C (32° to 122°F), when using internal reference
Operating modes
•
E1/T1 Drop and Insert
•
Proprietary EDMAC framed mode:
•
5% overhead – EDMAC (data rates < 2.048 Mbps all modes)
•
1.6% overhead - EDMAC-2 (rates >2.048 Mbps)
• EDMAC-3 – for SNMP Proxy – same as EDMAC
• VersaFEC
®
Codec (short-block, low latency and ultra-low-latency low density parity check
(LDPC))
•
VersaFEC-2
®
Codec (optional plug-in module, long-block, short-block)
•
VersaFEC
®
Adaptive Coding and Modulation – IP interface only – maximum symbol rate = 4.1
Msps
•
VersaFEC-2
®
Adaptive Coding and Modulation – IP interface only – maximum symbol rate =
12.5 Msps
•
Automatic Uplink Power Control (AUPC) mode
•
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)