Comtech EF Data CDM-500 Uživatelský manuál stáhnout pdf (Strana 4)

Specifications

Data Rate

18 kbps to 25 Mbps, in 1 bps steps

(modulation, FEC & data interface dependant)

Symbol Rate

18 ksps to 12.5 Msps

Operating

Frequency

50 – 180 MHz (standard) and

950 – 2000 MHz (TX) & 950 – 2150 MHz (RX) (Option),

(Note: extended L-Band receive supported on modems

shipped since January 2013)

100 Hz resolution, independent TX and RX operation

Major Operating

Modes

(See User Manual

For Details)

Open network, per IESS-308 / 309 / 310 / 314

transparent, closed network per IESS-315

LDPC / TPC Codec (optional plug-in module)

VersaFEC Codec (optional plug-in module) with ACM or

Constant Coding & Modulation (CCM)

EDMAC Framed with/without AUPC

RS Outer Codec

High rate ESC / Enhanced ESC (ESC++)

Drop & insert (D&I) /Enhanced D&I++

Quad E1 drop & insert (QDI)

DoubleTalk Carrier-in-Carrier (optional plug-in module)

FEC Options

None

Uncoded BPSK/QPSK/OQPSK

Viterbi: k=7, per

IESS-308/309

Rate 1/2 BPSK/QPSK/OQPSK

Rate 3/4 QPSK/OQPSK

Rate 7/8 QPSK/OQPSK

Viterbi with Reed

Solomon

Rate 3/4 16-QAM

Rate 7/8 16-QAM

Sequential

See CDM-625 user manual for details

Reed Solomon

Open network and closed network modes

TCM (Per IESS-

310)

8PSK/TCM Rate 2/3

Integrated LDPC

and TPC (2

Gen)

Codec (Optional

Plug-in Module)

LDPC Code Rates

Rate 1/2 BPSK/QPSK/OQPSK

Rate 2/3 QPSK/OQPSK/8PSK/8-QAM

Rate 3/4 QPSK/OQPSK/8PSK/8-QAM/16-QAM

TPC Code Rates

Rate 5/16 BPSK

Rate 21/44 BPSK/QPSK/OQPSK

Rate 3/4 QPSK/OQPSK/8PSK/8-QAM/16-QAM

Rate 7/8 QPSK/OQPSK/8PSK/8-QAM/16-QAM

Rate 0.95 QPSK/OQPSK/8PSK/8-QAM

VersaFEC Codec

(Optional Plug-in

Module)

BPSK Rate 0.488

QPSK Rate 0.533, 0.631, 0.706, 0.803

8-QAM Rate 0.576 (ECCM), 0.642, 0.711, 0.780

16-QAM Rate 0.644 (ECCM), 0.731, 0.780, 0.829, 0.853

BPSK 0.493 (ULL)

QPSK 0.493, 0.654, 0.734 (ULL)

Scrambling

IDR Mode, no RS, - per ITU V.35 (Intelsat variant)

IBS mode, no RS - per IESS-309, externally frame

synchronized

Transparent Closed Network mode, no RS or Turbo coding -

per ITU V.35 (Intelsat variant)

EDMAC mode, no RS coding - externally frame

synchronized - proprietary

Turbo Product Code/LDPC/VersaFEC modes - externally

frame synchronized - proprietary

All RS modes - externally frame synchronized per IESS-

308/309/310

Management

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

support, EIA-232, EIA-485 (2- or 4-wire)

Form C Relays

Hardware fault, RX and TX traffic alarms, open network

backward alarms

External Reference

(Input OR Output)

BNC connector

Input: 1, 2, 5, or 10 MHz, -6 dBm to

+10 dBm, 50 Ω/75 Ω (nominal)

Output: 10 MHz, 2.7 V peak-to-peak

± 0.4 V, low impedance output

Data Interfaces

EIA-422/-530 DCE , Up to 14 Mbps

25-pin D-sub (female)

V.35 DCE , Up to 14 Mbps

LVDS Serial , Up to 25 Mbps

25-pin D-sub (female)

HSSI Serial , Up to 25 Mbps

G.703 T1, 1.544 Mbps

(Balanced 100 Ω)

9-pin D-sub (female)

BNC (female)

G.703 T2, 6.312 Mbps

(Unbalanced 75 Ω or balanced

110 Ω)

G.703 E1, 2.048 Mbps

(Unbalanced 75 Ω or balanced

120 Ω)

G.703 E2, 8.448 Mbps (Unbalanced 75 Ω)

ASI , Up to 25 Mbps

BNC (female)

Additional 2.048 Mbps E1 Ports for Quad-

E1 (Balanced 120 Ω)

9-pin D-sub (female)

Overhead Data

44-pin High-density D-sub (male)

Modem Alarms

15-pin D-sub (male)

4-port 10/100Base-T Managed Ethernet

Switch

(Optional Packet Processor Available)

4 x RJ-45

Modulator

Frequency Stability

± 0.06 ppm (± 6 x 10

-8

), 0° to 50°C (32° to

122°F) with internal reference

Transmit Filtering

Per IESS-308

Transmit Filter Rolloff

25%, 35%

Harmonics and Spurious

Better than -60 dBc/4 kHz

(typically <-65 dBc/4kHz)

Measured from 1 to 500 MHz

(50-180 MHz band)

Measured F

± 500 MHz

(950-2000 MHz band)

Transmit On/Off Ratio

-60 dBc minimum

Output Phase Noise

< 0.480° rms double sided, 100 Hz to 1 MHz

(Minimum 16 dB better overall than the Intelsat IESS-

308/309 requirements)

dB/Hz Frequency Offset

-63.0 100 Hz

-73.0 1 kHz

-83.0 10 kHz

-93.0 100 kHz

Fundamental AC line spurious is -42 dBc or lower

The sum of all other single sideband spurious, from 0

to 0.75 x symbol rate, is -48 dBc or lower

Output Power

50-180 MHz:

0 to -25 dBm, 0.1 dB steps

950-2000 MHz:

0 to -40 dBm, 0.1 dB steps

Power Accuracy

50-180 MHz:

± 0.5 dB over frequency, data rate, modulation type

and temperature range of 15 to 35° C

± 0.8 dB over frequency, data rate, modulation type

and temperature range of 0 to 50° C

950-2000 MHz:

± 0.7 dB over frequency, data rate, modulation type

and temperature range of 15 to 35° C

± 1.0 dB over frequency, data rate, modulation type

and temperature range of 0 to 50° C

Output Impedance &

Return Loss

50-180 MHz: 50 Ω/75 Ω, 16 dB minimum return loss

(18 dB typical), BNC connector

950-2000 MHz: 50 Ω, 19 dB minimum return loss (21

dB typical), Type-N connector

Clocking Options

Internal, ± 0.06 ppm (SCT)

External, locking over a ± 100 ppm range (TT)

Loop timing (RX satellite clock) – supports

asymmetric operation

External clock

External TX Carrier Off

By TTL ‘low’ signal or external contact closure

BUC Reference

(10 MHz)

Via TX IF center conductor, 10.0 MHz

± 0.06 ppm (with internal reference), selectable

on/off, 0.0 dBm ± 3 dB

BUC Power Supply

(HW Option)

24 VDC, 4.17 Amps max., 90 W @ 50° C

48 VDC, 3.125 Amps max., 150 W @ 50° C (180 W

@ 30° C)

Supplied through TX IF center conductor and

selectable on/off via M&C control

1 2 3 4 5

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