CDM-760 High Speed Trunking Modem

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CDM-760 High Speed Trunking Modem

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  • Symbol Rate: 0.1 to 150 Msps
  • Data Rate: 0.1 to 314 Mbps
  • DVB-S2 ETSI EN 302 307 & DVB-S2X EN 302 307-2 compliant
  • DVB-S2-EB1&EB2 Efficiency Boost technology
  • DoubleTalk Carrier-in-Carrier bandwidth compression
  • ACM and CCM

SKU: CMT107 Tags: , , , ,
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  • Description
  • Technical Specifications
  • Support Documents

Overview

The CDM-760 Advanced High-Speed Trunking Modem builds on our award-winning family of high-speed, ultra efficient trunking modems. The CDM-760 further enhances our offerings to include ultra wide band symbol rates, near theoretical performance with minimal implementation loss, a variety of high efficiency MODCOD selections, Super Jumbo Frame (SJF) Ethernet support and many other value-added features.

The CDM-760 Advanced High-Speed Trunking Modem was designed to be the most efficient, highest throughput, point-to-point trunking modem available. The CDM-760 accommodates the most demanding Internet Service Provider (ISP) and telco backhaul links by offering users the most advanced combination of space segment saving capabilities while minimizing the need for unnecessary overhead.

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 space.

Comtech High Speed Trunking Modem CDM760 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.

CDM-760 Advanced High-Speed Trunking Modem Details

  • Symbol Rate: 0.1 to 150 Msps
  • Data Rate: 0.1 to 314 Mbps
  • DVB-S2 ETSI EN 302 307 & DVB-S2X EN 302 307-2 compliant
  • DVB-S2-EB1&EB2 Efficiency Boost technology
  • DoubleTalk Carrier-in-Carrier bandwidth compression
  • ACM and CCM
  • Embedded MetaCarrier DVB-CID ETSI TS 103 129
  • GSE – low overhead <1% encapsulation
  • K4 GZIP lossless compression
  • Automatic Uplink Power Control (AUPC)
  • Dynamic Pre-Distortion (DPD)
  • Super Jumbo Frame 64 – 10,240 Byte Support (In Non Packet Processor Mode)
  • Packet Processor with > 190,000 PPS simplex and > 350,000 PPS duplex
  • 9,000 Byte Jumbo Frame (In Packet Processor Mode)
  • Layer 3 Routed Mode operation with up to 256 static routes (>105,000 PPS simplex, >150,000 PPS duplex)
  • Modulation: QPSK, 8PSK, 16APSK, 32APSK
  • Dual IF: 70/140 MHz, L-Band and L-Band monitor (standard)
  • Data Interfaces
    • 2 Gigabit 10/100/1000Base-T interfaces (standard)
    • 1 Optical Gigabit interface (optional)
    • Processes > 600,000 pps simplex, 1.2M pps duplex
    • PIIC optional interface cards
    • ASI (DVB Asynchronous Serial Interface)
    • G.703 E3/T3/STS-1 (34.368, 44.736, 51.84 Mbps)
    • STM-1 Copper SDH (155.52 Mbps)
    • OC-3 SONET single mode or multi-mode 1300 nm (155.52 Mbps)
  • Multistream capable (Multi-Interface mux)
  • Supports Medium Earth Orbit (MEO) mode operation
  • Management: HTTP, SNMP, Telnet, RS-232/485
  • In-band (over satellite) M&C control
  • 1:1 and 1:N redundancy switching available
CDM-760 Advanced High-Speed Trunking Modem
Technical Specifications
Specifications
Symbol Rate Range DVB-S2: 100 Ksps to 150 Msps in 1 sps steps (modulation dependent)
DVB-S2-EB1&EB2: 100 Ksps to 150 Msps in 1 sps steps (modulation dependent)
Modulation Type DVB-S2: ETSI EN 302 307 compliant
DVB-S2-EB1&EB2: DVB-S2 with Efficiency Boost technology
FECFrame Normal (64,800 bits) or
Short (16,200 bits)
Pilots On or off
Alpha (Rolloff) DVB Compliant: 20%, 25% or 35%
Comtech Efficiency Boost DVB-S2-EB1&EB2:
5%, 10%, 15%, 20%, 25%, 35%
Management Front panel keypad / display RS-232 /485, or
10/100Base-T with SNMP, Telnet, HTTP
Reflash Ethernet management port
Frequency Stability Internal, stability ± 0.06 ppm
External Reference
Input / Output (BNC Female)		 Internal, 1, 2, 5 or 10 MHz for IF and data, internally phase locked.
Output: off or internal 10 MHz
Form C Modulator, demodulator and unit fault
Spectral Sense Normal and inverted
Configuration Retention Non-volatile memory; Returns upon power up
Options
Type / Option
FAST DVB-S2X, DVB-S2-EB1&EB2 TX / RX: 8PSK, 16APSK, 32APSK, 64APSK
FAST Symbol rate options
FAST & Hardware Carrier-in-Carrier options
FAST & Hardware Packet Processor (Can not be installed with any PIIC data interface cards)
FAST & Hardware K4 GZIP lossless compression
FAST ACM point to point client / controller
FAST Automatic Uplink Power Control (AUPC)
FAST DPD (Dynamic Pre-Distortion) 20 Msps – 72 Msps
FAST Optical Gigbit Ethernet enable
Hardware PIIC optional interface cards:
ASI (DVB Asynchronous Serial Interface)
G.703 E3/T3/STS-1 (34.368, 44.736, 51.84 Mbps)
STM-1 Copper SDH (155.52 Mbps)
OC-3 SONET single mode or multi-mode 1300 nm
(155.52 Mbps)
Hardware Rack slides
Modulator (Dual IF)
70/140 MHz 50 to 180 MHz in 100 Hz steps
Impedance / Connector 75 ω, BNC female. Return loss ≥ 18 dB
Output Power 0 to -25 dBm, 0.1 dB steps (70/140 MHz)
Power Accuracy ± 0.5 dB of nominal at 25°C; Within
± 0.5 dB from 25°C value at same frequency
L-Band 950 to 2150 MHz in 100 Hz steps
Impedance / Connector 50 ω, Type N female. Return loss ≥ 15 dB
Output Power 0 to -40 dBm, 0.1 dB steps
Power Accuracy ± 0.5 dB of nominal at 25°C
± 0.5 dB from 25°C value at same frequency
L-Band Monitor Same as L-Band or 900 + 70/140 MHz IF at -27 dBm ± 3 dB
Harmonics and Spurs < 60 dBc/4kHz, modulated carrier; Excludes spectral mask area
External TX Carrier Off TTL low signal
Quadrature Phase Error
and Amplitude Imbalance		 Sideband 35 dB below unmodulated carrier
Demodulator (Dual IF)
70/140 MHz / 50 to 180 MHz in 100 Hz steps
Impedance / Connector 75 ω, BNC female. Return loss 15 dB min.
Input Power Desired carrier:
Min. = -58 + 10Log (SRMSPS) dBm
Max. = -23 + 10Log (SRMSPS) dBm
or +10 dBm whichever is less.
Max. Composite Power +20 dBm or = 14 + 10Log (180 / SRMSPS) dBc
(whichever is less)
L-Band / 950 to 2150 in 100 Hz steps
Impedance / Connector 50 ω, Type N female. Return loss 10 dB min.
Input Power Desired carrier:
Min. = -70 + 10Log (SRMSPS)dBm
Max. = -20 + 10Log (SRMSPS) dBm
or +20 dBm whichever is less.
Maximum Composite +20 dBm or = 43 – 10Log (SRMSPS) dBc
(whichever is less)
Doubletalk Carrier-In-Carrier
Symbol Rate Range 1 Msps to 63 Msps in 1sps steps
Delay Range 0 to 400 ms
(factory default 230 – 290 ms)
CnC Ratio +7 dB to -7 dB interferer to desired
Es/No degradation (dB)
measured at 0.0 dB
CnC Ratio		 QPSK: 0.3 dB
8PSK: 0.3 dB
16APSK: 0.4 dB
32APSK: 0.5 dB
64APSK: 0.6 dB
Symbol Rate Ratio Max 3:1 TX/RX or RX/TX
Satellite Configuration Transmit station sees own carrier. Nonprocessing satellite.
Base Unit Connectors
Alarm Connector
(DB-15 Male)		 Form C: TX, RX and unit faults
External TX carrier off
IQ test point
Unit Management DB-9 male with RS-232 and RS-485 2-wire / 4-wire
RJ-45 Ethernet (maximum Ethernet packet size
1536 bytes including Ethernet header & CRC)
TX & RX IF Connectors BNC female (70/140 MHz)
Type-N female (L-Band)
L-Band Monitor SMA female
Ethernet Data Interfaces
on main modem (NonPacket Processor)		 2 x RJ-45 10/100/1000Base-T Ethernet
1 x Optical Gibabit Ethernet (optional)
Note: All Data GigE interfaces support super
jumbo frames with a maximum Ethernet frame size of 10,240 bytes including Ethernet header & CRC
Packet Processor Interface 4 x RJ-45 10/100/1000Base-T Ethernet interface (User Traffic), 1 x RJ11 (CLI serial), 1 x 10/100/1000Base-T Ethernet interface (Management)
Note: Cannot use any PIIC interfaces cards if Packet Processor is installed. Packet processor card will support super jumbo frames with a maximum Ethernet frame size of 9,000 bytes including Ethernet header & CRC
Test Functions
Data Test Pattern 2^10-1, 2^15-1, 2^23-1 compatible with BERT on TX data on applicable interfaces
CW Modulation disabled and CW signal is transmitted
SSB Carrier Provides suppressed carrier and suppressed sideband
Loopback Full-duplex only
Environmental and Physical
Operating Temperature 0 to 50°C (32 to 122°F)
Storage Temperature -40 to 70°C (-40 to 158°F)
Humidity 95% maximum, non-condensing
Power Supply Input 100-240 VAC 50/60 Hz
43-60 VDC (48 VDC option)
Power Consumption
  120 VAC at 60 Hz
  230 VAC at 50 Hz
  48 VDC		   
88 W, 93 VA typical
88 W, 133 VA typical
85 W typical
Dimensions (1RU)
(height x width x depth)		 1.75” x 19” x 18.65”
(48 x 47.4 x 4.4 cm)
Weight 15 lbs (6.8 kg)
AC Receptacles Includes restraint for standard IEC-320 inlet
Agency Compliance CE Mark and FCC part 15
Accessories
Type / Option
1:1 Modem Redundancy CRS-170A (L-Band), CRS-180 (70/140 MHz)
1:N Modem Redundancy CRS-500 70/140 MHz or L-Band
(Only for use with 10/100/1000Base-T or G.703 T3/E3/STS-1 interfaces)


CDM-760 Advanced High-Speed Trunking Modem Datasheet PDF

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