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
- 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.
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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