Comtech EF Data CDM-Qx Manual de usuario descargar pdf (Pagina 3)

Feature Enhancements

Enhancing the capability of CDM-Qx/QxL in the field is easy. Features that do not require additional hardware can be added on site,

using FAST access codes purchased from Comtech EF Data.

Data Interfaces

The CDM-Qx/QxL support a range of data interfaces – EIA-422, V.35, Sync EIA-232, G.703 T1, G.703 E1, Quad G.703 E1, G.703 E2

and HSSI.

CDM-Qx Shown With:

Slot 1 Modulator Card with G.703 Balanced Interface

Slot 2 Modulator Card with G.703 Balanced Interface

Slot 3 Modulator Card with EIA-530 Interface

Slot 4 Modulator Card with EIA-530 Interface

Notes:

 Also shown, placed above the CDM-Qx are the modulator and demodulator cards with G.703 Unbalanced (BNC) interface.

 Typically each modulator and demodulator card requires a data interface. However, if configured as a modem, only the demodulator

card requires a data interface.

 Unlike other data interfaces, the Quad E1 interface requires 2 slots in the CDM-Qx/QxL chassis

Specifications

Data Rate

(See Summary Table)

32 kbps to 20 Mbps, in 1 bps steps

(data interface dependant)

Symbol Rate Up to 10 Msps

Scrambling V.35, or synchronous

FEC

(See Summary Table)

Viterbi 1/2, 3/4 and 7/8

Concatenated Reed-Solomon 1/2, 2/3, 3/4, and

7/8

Turbo Product Coding

(TPC) -

Generation

Hardware option

BPSK Rate 5/16 and 21/44

QPSK Rate 21/44, 3/4, 7/8, and 17/18

8PSK Rate 3/4, 7/8, and 17/18

16-QAM Rate 3/4 and 7/8

M&C Interface EIA-232, EIA-485 (2- or 4-wire),

10/100 Base-T Ethernet with SNMP, HTTP and

Telnet support

Form C Relays TX, RX traffic alarms and unit faults

External Reference 1, 2, 5, 10 or 20 MHz, BNC connector

IF Impedance &

Connectors

CDM-Qx: 75  (Optional 50 ), BNC female

CDM-QxL: 50 , Type-N female

Monitor Functions E

, Frequency Offset, BER, buffer fill status,

RX signal level, carrier power ratio

Modulator

Frequency Range CDM-Qx: 50 to 90, 100 to 180 MHz

CDM-QxL: 950 to 1950 MHz

100 Hz frequency resolution (both)

Frequency Stability

CDM-Qx:  1.0 ppm (standard),  0.1 ppm

(optional), 0 to 50ºC (32 to 122ºF)

CDM-QxL:  0.1 ppm, 0 to 50ºC (32 to 122ºF)

Harmonics and

Spurious

<-55 dBc/4 kHz (typically <-60 dBc/4 kHz)

Transmit On/Off Ratio 55 dB minimum

Phase Noise < 0.75 degrees RMS double-sided,

100 Hz to 1 MHz

Output Power (per

Modulator)

CDM-Qx: -5 to -25 dBm, 0.1 dB step

CDM-QxL: -5 to -45 dBm, 0.1 dB step

Power Accuracy

 1 dB over frequency and temperature

External Carrier Off

BUC FSK

Communications

BUC Power Supply

By TTL low signal

CDM-QxL: Via TX center conductor with FSK

capable BUCs

CDM-QxL: None, 24 VDC, 48 VDC (option)

Demodulator

Frequency Range CDM-Qx: 50 to 90, 100 to 180 MHz

CDM-QxL: 950 to 1950 MHz

100 Hz frequency resolution (both)

Input Power CDM-Qx:

-15 to -45 dBm, <

2.048 Msps

-15 to -40 dBm, > 2.048 Msps <

4.096 Msps

-15 to -35 dBm, > 4.096 Msps

CDM-QxL:

-130 + 10log(symbol rate) dBm (minimum)

Automatic Gain Control CDM-QxL: 50 dB

Max Composite Level CDM-Qx: +35 dBc, up to -5 dBm,

+76 – 10log(symbol rate) dBc within 10 MHz

of desired carrier

CDM-QxL: +87 – 10log(symbol rate) dBc

(Broadband), +76 – 10log(symbol rate) dBc

within 10 MHz of desired carrier, -5 dBm

absolute maximum

Acquisition Range

CDM-Qx:  1 to  32 kHz, programmable, in 1

kHz steps (symbol rate > 64 ksps)

 1 to  (SR/2) kHz, programmable, in

1 kHz steps (symbol rate <= 64 ksps)

CDM-QxL:  1 to  200 kHz, programmable,

in 1 kHz steps (symbol rate > 625 ksps)

 1 to  32 kHz, programmable, in 1 kHz

steps (64 ksps < symbol rate < 625 ksps)

 1 to  (SR/2) kHz, programmable, in

1 kHz steps (symbol rate <= 64 ksps)

Receive Buffer 512, 1024, 2048, 4096, 8182, or 16384 bits

Receive Clock Options RX satellite, TX terrestrial, external reference

Clock Tracking



100 ppm minimum

LNB Voltage CDM-QxL: Off, 13 VDC or 18 VDC, 500 mA

(max.)

DoubleTalk Carrier-in-Carrier

Minimum Symbol Rate 256 ksps

Propagation Delay 0 to 330 ms

Max Symbol Rate Ratio

(See Whitepaper)

3:1 (TX:RX or RX:TX)

Max Power Ratio

(See Whitepaper)

TX carrier power (interferer) – RX carrier

power (desired), in dB, < 10 dB

(except for 16-QAM, TPC, R=7/8)

TX carrier power (interferer) – RX carrier

power (desired), in dB, < 7 dB

(16-QAM, TPC, R=7/8)

Satellite Restrictions

Satellite in “loop-back” mode (i.e. TX station

must be able to receive itself)

“Non-processing” satellite (i.e. does not

demodulate/remodulate the signal)

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