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The CDM-760 offers an expansive range of symbol rates (1 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).
| TYPICAL USERSMobile OperatorsTelecom OperatorsISPsGovernment & Military | COMMON APPLICATIONSIP TrunkingG.703 TrunkingHigh-Speed Content DeliveryDisaster Recovery & Emergency Communications |
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-S2 Extension 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.
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.
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.
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 efficiency, DoubleTalk Carrier-in-Carrier utilizing advanced signal processing techniques provides a new dimension in bandwidth and power efficiency.
DoubleTalk Carrier-in-Carrier allows satellite users to achieve spectral efficiencies (i.e. bps/Hz) that cannot be achieved with traditional links. E.g., DoubleTalk Carrier-in-Carrier when used with 16-QAM approaches the bandwidth efficiency of 256-QAM (8bps/Hz).
As DoubleTalk Carrier-in-Carrier allows equivalent spectral efficiency using a lower order Modulation and/or FEC Code, it can simultaneously reduce CAPEX by allowing a smaller BUC/HPA and/or antenna.
When combined with VersaFEC or LDPC/TPC, 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.
| Specifications | |
|---|---|
| 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 |
| FEC Frame | 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 | |
| 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 |
| 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. = -118 + 10Log(SR in Msps) dBm. Max. = -83 + 10Log(SR in Msps) 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. = -130 + 10Log(SR in Msps) dBm. Max. = -80 + 10Log(SR in Msps) 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 |
| Ethernet Data Interfaces | 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 |
| 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 Storage | 0 to 50°C (32 to 122°F) -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 | |
| 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) |
