CDM-625A Advanced Satellite Modem

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CDM-625A Advanced Satellite Modem

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  • DoubleTalk Carrier-in-Carrier bandwidth compression
  • Carrier-in-Carrier Automatic Power Control
  • Dual Band Capability: 70/140 MHz and extended L-Band (950 – 2250 MHz) in same unit
  • Data Rate: 18 kbps to 25 Mbps
  • Symbol Rate: 18 ksps to 12.5 Msps
  • Modulation: BPSK, QPSK/OQPSK, 8PSK/8-QAM/8-ARY, 16-QAM/16-ARY, 32-ARY

SKU: CMT116 Tags: , , , ,
  • Description
  • Technical Specifications
  • Support Documents

CDM-625A Advanced Satellite Modem Overview

The CDM-625A Advanced Satellite Modem builds on our legacy of providing the most efficient and reliable satellite modems. With support for VersaFEC® Forward Error Correction (FEC), the revolutionary DoubleTalk Carrier-inCarrier bandwidth compression, additional rolloffs and advanced packet processing, the CDM-625A Advanced Satellite Modem provides significant savings under all conditions. This combination of advanced technologies enables multi-dimensional optimization, allowing satellite communications users to:

  • Minimize operating expenses (OPEX)
  • Maximize throughput without using additional transponder resources
  • Maximize availability (margin) without using additional transponder resources
  • Minimize capital expenses (CAPEX) by allowing a smaller BUC/HPA and/or antenna
  • Or, a combination to meet specific business needs

Doubletalk Carrier-in-Carrier

DoubleTalk Carrier-in-Carrier, based on patented “Adaptive Cancellation” technology, allows transmit and receive carriers of a duplex link to share the same transponder bandwidth. DoubleTalk Carrier-in-Carrier is complementary to all advances in modem technology, including advanced FEC and modulation techniques. As these technologies approach theoretical limits of power and bandwidth efficiencies, DoubleTalk Carrier-in-Carrier utilizing advanced signal processing techniques provides a new dimension in bandwidth efficiency.

CDM-625A Advanced Satellite Modem Figure

Figure 1 shows the typical full-duplex satellite link, where the two carriers are adjacent to each other.

Figure 2 shows the typical DoubleTalk Carrier-in-Carrier operation, where the two carriers are overlapping, thus sharing the same spectrum.

When observed on a spectrum analyzer, only the Composite is visible. Carrier 1 and Carrier 2 are shown in Figure 2 for reference only.

As DoubleTalk Carrier-in-Carrier allows equivalent spectral efficiency using a lower order modulation and/or code rate, it can reduce the power required to close the link thereby reducing CAPEX by allowing a smaller BUC/Amplifier and/or antenna. Alternatively, DoubleTalk Carrier-in-Carrier can be used to achieve very high spectral efficiencies E.g., DoubleTalk Carrier-in-Carrier when used with 16-ARY modulation approaches the bandwidth efficiency of 256-ARY (8 bps/Hz).

When combined with VersaFEC-2 or VersaFEC and optimized transmit filter rolloff, it can provide unprecedented savings in transponder bandwidth and power utilization. This allows for its successful deployment in bandwidth-limited and power-limited scenarios, as well as reduction in earth station BUC/HPA power requirements.

Details

  • DoubleTalk Carrier-in-Carrier bandwidth compression
  • Carrier-in-Carrier Automatic Power Control
  • VersaFEC-2 High Performance LDPC with Adaptive Coding and Modulation (ACM), Short Block and Long Block
  • VersaFEC FEC with Adaptive Coding and Modulation (ACM)
  • 5%, 10%, 15%, 20%, 25% and 35% Filter Rolloff
  • Packet Processor with header compression, payload compression, advanced Quality of Service (QoS) and Managed Switch Mode with VLAN support
  • Integrated 4-port managed Ethernet switch with VLAN and QoS
  • Jumbo frame support
  • Dual Band Capability: 70/140 MHz and extended L-Band (950 – 2250 MHz) in same unit
  • Data Rate: 18 kbps to 25 Mbps
  • Symbol Rate: 18 ksps to 12.5 Msps
  • Modulation: BPSK, QPSK/OQPSK, 8PSK/8-QAM/8-ARY, 16-QAM/16-ARY, 32-ARY
  • FEC: Viterbi, Sequential, Concatenated Reed Solomon, TCM, Turbo Product Code (TPC) (IESS-315 Compliant), LDPC Code , VersaFEC (low-latency LDPC) and VersaFEC-2 (high performance LDPC)
  • Widest Range of data interfaces: EIA-422/530, V.35, G.703 T1, G.703 E1, G.703 T2, G.703 E2, Quad G.703 E1, ASI, LVDS, HSSI, 4-port 10/100Base-T Ethernet
  • IEEE 1588v2 Precision Time Protocol
  • Sub Mux to multiplex IP/Ethernet traffic with serial or G.703 traffic
  • Drop & insert for T1/E1
  • Enhanced D&I++ for single T1/E1 & quad E1
  • Management: 10/100Base-T Ethernet with SNMP, Distant End SNMP Proxy, HTTP, Telnet and EIA-232/EIA-485
  • RADIUS Client
  • Carrier ID using MetaCarrier® Technology
  • Embedded Distant-end Monitor and Control (EDMAC)
  • Automatic Uplink Power Control (AUPC)
  • Engineering Service Channel (ESC/ESC++)
  • Standard high-stability internal reference (± 6 x 10-8)
  • 5-tap Adaptive Equalizer
  • L-Band TX: 10 MHz reference for BUC, FSK communications and optional BUC power supply
  • L-Band RX: 10 MHz reference and LNB power supply
  • L-Band: Advanced FSK for LPOD M&C
  • 1:1 and 1:10 redundancy switches available
  • Backwards compatible with CDM-625
  • Environmentally Resistant version (CDMER-625A) available

Specifications
Data Rate 18 kbps to 25 Mbps, in 1 bps steps
(modulation, FEC & data interface dependant)
Symbol Rate 18 ksps to 12.5 Msps
Operating Frequency 50 – 180 MHz (standard) and 950 – 2250 MHz (option)
100 Hz resolution, independent TX and RX operation
Major Operating Modes (See User Manual For Details) Open network, per IESS-308 / 309 / 310 / 314 transparent, closed network per IESS-315
LDPC / TPC Codec (option)
VersaFEC Codec (option) with ACM or Constant Coding & Modulation (CCM)
EDMAC Framed with/without AUPC
RS Outer Codec
High rate ESC / Enhanced ESC (ESC++)
Drop & insert (D&I) /Enhanced D&I++ (option)
Quad E1 drop & insert (QDI) (option)
DoubleTalk Carrier-in-Carrier (option)
FEC & Modulation
None Uncoded BPSK/QPSK/OQPSK
Viterbi: k=7, per IESS-308/309 Rate 1/2 BPSK/QPSK/OQPSK
Rate 3/4 QPSK/OQPSK
Rate 7/8 QPSK/OQPSK
Viterbi with Reed Solomon Rate 3/4 16-QAM
Rate 7/8 16-QAM
Sequential See CDM-625A user manual for details
Reed Solomon Open network and closed network modes
TCM (Per IESS- 310) 8PSK/TCM Rate 2/3
Integrated LDPC and TPC (2nd Gen) Codec (Optional Plug-in Module) LDPC Code Rates
Rate 1/2 BPSK/QPSK/OQPSK
Rate 2/3 QPSK/OQPSK/8PSK/8-QAM
Rate 3/4 QPSK/OQPSK/8PSK/8-QAM/16-QAM
TPC Code Rates
Rate 5/16 BPSK
Rate 21/44 BPSK/QPSK/OQPSK
Rate 3/4 QPSK/OQPSK/8PSK/8-QAM/16-QAM
Rate 7/8 QPSK/OQPSK/8PSK/8-QAM/16-QAM
Rate 0.95 QPSK/OQPSK/8PSK/8-QAM
VersaFEC Codec (Option) BPSK Rate 0.488
QPSK Rate 0.533, 0.631, 0.706, 0.803
8-QAM Rate 0.576 (ECCM), 0.642, 0.711, 0.780
16-QAM Rate 0.644 (ECCM), 0.731, 0.780, 0.829, 0.853
BPSK 0.493 (ULL)
QPSK 0.493, 0.654, 0.734 (ULL)
VersaFEC-2 Codec (Option) Long Block:
BPSK Rate 0,489
QPSK Rate 0.489, 0.537, 0.586, 0.611, 0.635, 0.660, 0.684,
0.733
8-ARY Rate 0.521, 0.537, 0.562, 0.586, 0.611, 0.635, 0.660,
0.684, 0.708, 0.733
16-ARY Rate 0.586, 0.611, 0.635, 0.660, 0.684, 0.708,
0.733, 0.757, 0.782
32-ARY Rate 0.660, 0.684, 0.708, 0.733, 0.757, 0.782,
0.801, 0.831, 0.855, 0.879
Short Block:
BPSK Rate 0,489
QPSK Rate 0.489, 0.537, 0.586, 0.611, 0.635, 0.660, 0.684,
0.733
8-ARY Rate 0.521, 0.537, 0.562, 0.586, 0.611, 0.635, 0.660,
0.684, 0.708, 0.733
16-ARY Rate 0.586, 0.611, 0.635, 0.660, 0.684, 0.708,
0.733, 0.757, 0.782
32-ARY Rate 0.660, 0.684, 0.708, 0.733, 0.757, 0.782,
0.801, 0.831
Scrambling IDR Mode, no RS, - per ITU V.35 (Intelsat variant)
IBS mode, no RS - per IESS-309, externally frame synchronized
Transparent Closed Network mode, no RS or Turbo coding - per ITU V.35 (Intelsat variant)
EDMAC mode, no RS coding - externally frame synchronized - proprietary
Turbo Product Code/LDPC/VersaFEC modes - externally frame synchronized - proprietary
All RS modes - externally frame synchronized per IESS- 308/309/310
Management 10/100Base-T Ethernet with SNMP, HTTP and Telnet support, EIA-232, EIA-485 (2- or 4-wire)
Form C Relays Hardware fault, RX and TX traffic alarms, open network backward alarms
External Reference (Input OR Output) BNC connector
Input: 1, 2, 5, or 10 MHz, -6 dBm to +10 dBm, 50 Ω/75 Ω (nominal)
Output: 10 MHz, 2.7 V peak-to-peak ± 0.4 V, low impedance output
(View our PDF Datasheet for more information)

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