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SKU
CDM-760
Comtech EF Data CDM-760 Ultra Advanced High-Speed Trunking Modem is available to buy in increments of 1

Data Rate: 0.1 to 314 Mbps, DVB-S2-EB1 Efficiency Boost technology, 2 Gigabit 10/100/1000Base-T interfaces (standard)

CDM-760 Ultra Advanced High-Speed Trunking Modem

The Comtech 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, our proprietary DVB-S2 Efficiency Boost technology, Super Jumbo Frame (SJF) Ethernet support and many other value-added features.

The Comtech Radyne 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.

Comtech CDM-760 RF Interface

The 760 Series Satellite Modem offers an expansive range of symbol rates (100 ksps to 150 Msps) and data rates (100 kbps to 314 Mbps). Run in a duplex setting, this is a staggering 628 Mbps or 300 Msps. Coupling these speeds with the native Super Jumbo Frame Ethernet interfaces supporting Ethernet frames from 64 Bytes to >10,000 Bytes and the CDM-760 will process Ethernet frames at a blazing (> 1.2 Million packets / second).

Expanding on the efficient DVB-S2 EN 302 307 standard, the CDM-760 again furthers spectral efficiency with its DVB-S2-EB1 (Efficiency Boost) waveforms. DVB-S2 is widely accepted as the most spectrally efficient standards-based waveforms. With our Efficiency Boost technology (DVB-S2-EB1), you can achieve a 10% – 35% increase in efficiency over the DVB-S2 standard without an increase in power or occupied bandwidth. The CDM-760 accomplishes this task by virtually doubling the number of available MODCODs, introducing three new ROF figures (5%, 10% and 15%) and minimizing implementation loss to near theoretical operation. The CDM-760 is software upgradeable to support future standards including DVB-S2 Efficiency Boost, DVB-Sx and DVB-S3.

Implementing Adaptive Coding and Modulation (ACM) operation allows link margin to be converted to user capacity during non-faded conditions by taking advantage of the actual signal to noise ratio rather than calculated worst case signal to noise.

By using the best encapsulation methods, the CDM-760 further increases throughput by using minimal overhead. In G.703 synchronous mode, users can implement monitor and control over the satellite with no additional overhead. When using Ethernet bridge mode, less than 1% overhead is used for encapsulation.
The optional K4 GZIP lossless compression engine performs real-time compression of Ethernet traffic and is capable of running at the full rate of the modem. Offering 52% to 59% compression rates at random packet sizes using the Calgary Corpos bitstream, K4 GZIP can greatly increase the throughput of the satellite link, or reduce required bandwidth.

Additionally, the CDM-760 leverages our powerful DoubleTalk® Carrier-in-Carrier® “Adaptive Cancellation” technology. With the ability to overlay TX and RX carriers, Carrier-in-Carrier enables the operator to establish the perfect balance between bandwidth and power, enabling the best possible use of the satellite resource and reducing operating expenses (OPEX).

These technologies alone offer enormous savings to the ISP and telco operator. When used in combination, however, the savings are astronomical. The innovative high-performance architecture of the CDM-760 allows efficient networking and transport over satellite links while supporting a wide range of applications and network topologies.

Comtech CDM-760 Network Configuration Diagram

Features

Symbol Rate: 0.1 to 150 Msps

Data Rate: 0.1 to 314 Mbps

DVB-S2 ETSI EN 302 307 compliant

DVB-S2-EB1 Efficiency Boost technology

DoubleTalk Carrier-in-Carrier bandwidth compression

ACM and CCM

GSE – low overhead <1% encapsulation

K4 GZIP lossless compression

Super Jumbo Frame 10,240 Byte Support

Modulation: QPSK, 8PSK, 16APSK, 32APSK

Dual IF: 70/140 MHz, L-Band and L-Band monitor


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

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)

Management: HTTP, SNMP, Telnet, RS-232/485

In-band (over satellite) M&C control

1:1 and 1:N redundancy switching available 

DVB-S2, Normal Block, Pilot ON, QEF (PER 10e-7)

MOD

FEC

Min SR (Msps)

Max SR (Msps)

Min DR (Mbps)

Max DR (Mbps)

Spec Eff

(Bits / Hz)

QEF Eb/No

QEF Es/No

QPSK

1/2

0.1

150

0.10

144.80

0.97

1.4

1.2

QPSK

3/5

0.1

150

0.12

174.00

1.16

1.9

2.5

QPSK

2/3

0.1

150

0.13

193.70

1.29

2.2

3.3

QPSK

3/4

0.1

150

0.15

217.80

1.45

2.7

4.3

QPSK

4/5

0.1

150

0.15

232.40

1.55

3.0

4.9

QPSK

5/6

0.1

150

0.16

242.30

1.62

3.3

5.4

QPSK

8/9

0.1

150

0.17

258.60

1.72

4.0

6.4

QPSK

9/10

0.1

150

0.17

261.90

1.75

4.2

6.6

8PSK

3/5

0.1

120

0.17

208.80

1.74

3.4

5.8

8PSK

2/3

0.1

120

0.19

232.30

1.94

4.0

6.9

8PSK

3/4

0.1

120

0.22

261.40

2.18

4.7

8.1

8PSK

5/6

0.1

120

0.24

290.60

2.42

5.7

9.6

8PSK

8/9

0.1

120

0.26

310.30

2.59

6.9

11.0

8PSK

9/10

0.1

120

0.26

314.20

2.62

11.2

11.2

16APSK

2/3

0.1

90

0.26

231.80

2.58

5.3

9.4

16APSK

3/4

0.1

90

0.29

260.60

2.90

6.0

10.6

16APSK

4/5

0.1

90

0.31

278.10

3.09

6.5

11.4

16APSK

5/6

0.1

90

0.32

290.00

3.22

6.9

12.0

16APSK

8/9

0.1

90

0.34

309.60

3.44

7.8

13.2

16APSK

9/10

0.1

90

0.35

313.50

3.48

8.1

13.5

32APSK

3/4

0.1

72

0.36

260.90

3.62

7.5

13.1

32APSK

4/5

0.1

72

0.39

278.40

3.87

8.2

14.1

32APSK

5/6

0.1

72

0.40

290.20

4.03

8.6

14.7

32APSK

8/9

0.1

72

0.43

309.80

4.30

9.9

16.2

32APSK

9/10

0.1

72

0.44

313.70

4.36

10.1

16.5

Symbol Rate Range

DVB-S2: 100 Ksps to 150 Msps in 1 sps steps (modulation dependent)

DVB-S2-EB1: 100 Ksps to 150 Msps in 1 sps steps (modulation dependent)

Modulation Type

DVB-S2: ETSI EN 302 307 compliant

DVB-S2-EB1: 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: 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-S2, DVB-S2-EB1 TX / RX: 8PSK, 16APSK, 32APSK

FAST

Symbol rate options

FAST & Hardware

Carrier-in-Carrier options

FAST & Hardware

K4 GZIP lossless compression

FAST

ACM point to point client / controller

FAST

Optical Gigbit Ethernet enable

Hardware

PIIC optional interface cards 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

 

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: 0.6 dB 32APSK: 1.0 dB

Symbol Rate Ratio

Max 3:1 TX/RX or RX/TX

Satellite Configuration

Transmit station sees own carrier. Non-processing 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

 

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 Temperature

Operating

0 to 50°C (32 to 122°F)

Storage

-40 to 70°C (-40 to 158°F)

Humidity

95% maximum, non-condensing

Power Supply Input

100 to 240 AC 50/60 Hz

Power Consumption

120 VAC at 60 Hz

230 VAC at 50 Hz

88 W, 93 VA typical

88 W, 133 VA 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 Technical Specifications Page 1

CDM-760 Technical Specifications Page 2

CDM-760 Technical Specifications Page 3

CDM-760 Technical Specifications Page 4

Typical Users

Mobile Operators
Telecom Operators
ISPs
Government & Military


Common Applications

IP Trunking
G.703 Trunking
High-Speed Content Delivery
Disaster Recovery & Emergency Communications