SATELLITE PRODUCTS



satellite modem

SDM-300L

INTRODUCTION COST EFFECTIVE

The SDM-300L expands the closed network capabilities of ComTech EFData’s SDM-300L employs Fully Accessible System
SDM-300 series modems into L-Band frequencies. The SDM- Topology (FAST). This technology provides a cost-effective
300L is available in two versions: approach to upgrading satellite modem configurations on site
• L1 Version: 70 / 140 MHz Transmit and L-Band Receive instead of returning the equipment to the factory. FAST is an
• L2 Version: L-Band Transmit and L-Band Receive exclusive and industry-first feature that eliminates the need to
purchase options before they are needed. This makes feature
The SDM-300L utilizes advanced technology and proprietary selection easy and eliminates guesswork.
digital signal processing techniques. This design eliminates
analog circuitry to perform modem signal processing, resulting in Purchase of an SDM-300L base modem includes the following
higher reliability and reduced packaging size. features:
• BPSK and QPSK
M AIN FE ATURES
• Either Viterbi or Sequential decoding (Customer-Selection)
• 19.2 kbit/s to 4.375 Mbit/s • Single data rate
• Fully Accessible System Topology (FAST) • TX IF range of 50 to 180 MHz or L-Band 950 to 1750 MHz
• Closed Network Capability • RX IF range of 950 to 1750 MHz
• Automatic Uplink Power Control (AUPC) Enhancing the SDM-300L’s performance is easy and
• Asynchronous (Async) Channel Unit Overhead uncomplicated. When additional features are required, they are
• Reed-Solomon added quickly on site. using the FAST access code purchased
• Fast Acquisition from ComTech EFData. These features are enabled by entering
• Built-In Self Test (with L-Band TX and RX only) this code at the front panel.
• OQPSK FE ATURE ENH ANCEM ENTS
AP PLIC ATIO NS
Base unit enhancements include:
Fully configured, the SDM-300L meets or exceeds all closed • Changing from single rate to variable rate
network requirements and is available with a full range of industry • Extending the data rate from 512 kbit/s to 4.375 Mbit/s
standard digital interfaces. • Both Viterbi and Sequential decoding
COM P ATI BILITY • OQPSK
Option card enhancements include:
Maintaining ComTech EFData’s excellent history of modem
compatibility, the SDM-300L is functionally compatible with many • AUPC/ASYNC (automatic up link power control/asynchronous
ComTech EFData modems. When configured properly, the SDM- EIA-232 / 485 channel)
300L will inter-operate with the following ComTech EFData • Reed-Solomon concatenated codec
modems: TEST AND M ONITO R FE ATURES
• SDM-100
The SDM-300L has extensive test capability to aid installation,
• SDM-100A
troubleshooting, and maintenance.
• SDM-300
• SDM-300A Features Include:
• SDM-650B • Interface Loopback – at the modulator and demodulator data
• SDM-6000 interface (bi-directional)
• SDM-8000 • Baseband Loopback – at the data interface (bi-directional)
• BER, Eb/No, Buffer Fill %
• IF Loopback (not available with 70/140 MHz Tx IF)

 2000 ComTech EFData Corp. (Part Number DS/SDM300L) 21-Jul-00

 SDM-300L SPECIFICATIONS

SPECIFICATIONS (FULLY ENHANCED) REMOT E CONT ROL SPECIF ICAT IONS

Digital Interface (Standard) EIA-232, EIA-422, and V.35 (25-pin D) Serial Interface EIA-232 or EIA-485 (2 or 4 wire)
Digital Data Rate 19.2 kbit/s to 4.375 Mbit/s, in 1 bit/s steps Signals Controlled/Monitored TX Frequency RX Frequency
Symbol Rate 10.9 ksym/s to 2.5 Msym/s TX Power TX ON/OFF
BPSK 1/2 rate Data Rate Select Data Loopback
Modulation/Demodulation QPSK 1/2, 3/4, and 7/8 rates Scrambler ON/OFF IF Loopback (L-Band)
OQPSK 1/2, 3/4, and 7/8 rates RX Carrier Detect Raw Error Rate
2 to 99 ms, in 2 ms steps Power Supply Voltages RX Signal Level
Plesiochronous Buffer
32 to 262,122 bit/s, in 16 bit steps Plesiochronous Buffer Fault Status
Viterbi, K=7, 1/2, 3/4, and 7/8 rates Field Upgradeability Error Threshold Alarm
Forward Error Correction Sequential 1/2, 3/4, and 7/8 rates
Reed-Solomon Will maintain current configuration for at least one year
Data Scrambling IESS-308 (V.35) or None Configuration Retention
without power
External Reference Input 1, 5, 10, 20 MHz
Agency Approvals CE Mark
AVAILABLE OPTIONS
MODUL AT ION SPECIF ICAT IONS
70/140 MHz (L1 option) L-Band (L2 option) How
Option
50 to 90 and 100 to 950 to 1750 MHz in Enabled
Output Frequency FAST Variable Data Rate
180 MHz in 1 Hz steps 100 Hz steps
(+5 to -20 dBm), 0 to -30 dBm, in FAST Add Viterbi or Sequential Decoder
Output Power FAST OQPSK
in 0.1 dB steps 0.1 dB steps
Output Stability ± 0.5 dB ± 0.5 dB FAST Asymmetrical Loop Timing
Output Spurious in 4 KHz < -50 dBc, FAST + Card G.703 Interface
Band 20 to 500 MHz > 64 Kbit/s < -50 dBc, FAST + Card Concatenated Reed-Solomon Codec
(measured with modulated < -45 dBc, 55 to 2000 MHz Asynchronous Overhead (Async/AUPC), with 50-pin D
FAST + Card
carrier) 20 to 500 MHz < 64 Kbit/s Connector
<-66 dBc/Hz @100 Hz <-63 dBc/Hz @100 Hz FAST + Card BUC communications (future)
<-76 dBc/Hz @1 kHz <-73 dBc/Hz @1 kHz ODU Power Supply ≤ 3 amps at TBD VDC (L-Band TX IF
Hardware
Output Phase Noise <-86 dBc/Hz @10 kHz <-83 dBc/Hz @10 kHz option only)
<-96 dBc/Hz @100 kHz <-93 dBc/Hz @100 kHz Hardware ± 0.02 ppm Internal Stability (70/140 MHz TX IF option)
<-96 dBc/Hz @ 1 MHz Hardware ± 0.02 ppm LNB Reference (70/140 MHz TX IF option)
Output Impedance, Return Hardware 50Ω IF (70/140 MHz TX IF option)
75Ω, > 20 dB 50Ω, > 15 dB Hardware -48 VDC Power Supply (Not available with ODU Power Supply)
Loss
Output Connector BNC, Female Type N, Female Hardware Rx (demodulator) Only
IESS-308/309, IESS-308/309, Hardware Rx (demodulator) Only with 0.02 ppm internal stability
Output Spectrum Hardware 70/140 MHz TX IF
EFD Closed EFD Closed
Data Clock Source Internal or External Internal or External Hardware L-Band TX-IF
Internal Stability ± 10 ppm ± 0.02 ppm 25-Pin Female D Connector with EIA-530 (EIA-422), EIA-232
Hardware
Outdoor Reference On or Off and V.35
(center conductor of IF N/A 10 MHz + 0.02 ppm at 37-Pin Female D Connector with EIA-530 (EIA-422) and MIL-
Hardware
Output connector) 0 dBM, +3/-1 dB 188-114
Outdoor Unit Voltage On or Off Hardware 34-Pin Female V.35 “Winchester” Connector with V.35
(center conductor of IF N/A (See Optional LNB Power 50-Pin Female D Connector for use Without Overhead card.
Hardware
Output connector) Supply) Inlcudes EIA-422, EIA-232, and V.35
DEMO DUL AT ION SPECIF ICAT IONS BER PERFORMANCE
Input Frequency 950 to 1750 MHz in 100 Hz steps T YPICAL EB/N0 , PERFORMANCE, SEQ UENT IAL DECO DER
Minimum Input Power
+10 log (symbol rate) -135 dBm BPSK (1/2 Only), QPSK and OQPSK
(Desired Carrier)
Data Rate BER 1/2 3/4 7/8
AGC Range 50 dB above minimum input level
Composite to 100 kbit/s 10-5 4.2 dB 5.2 dB 6.3 dB
+40 dBc, composite is AWGN over ± 10 MHz
Desired Carrier 10-7 5.1 dB 6.1 dB 7.5 dB
Maximum Composite Level -5 dBm 1.544 Mbit/s 10-5 5.3 dB 5.8 dB 6.6 dB
Input Impedance,
75Ω, > 10 dB 10-7 6.0 dB 6.7 dB 7.6 dB
Return Loss
Input Connector Type N, Female (50Ω mechanical) T YPICAL EB/N0 PERF ORMANCE, VIT ERBI DECO DER
Carrier Acquisition Range 0 to 75 kHz in 100 Hz steps BPSK (1/2 Only), QPSK And OQPSK
Acquisition Time <1 second at 64kbits/s 1/2 rate BER 1/2 3/4 7/8
Sweep Reacquisition 0 to 999 seconds, in 1 second steps 10-5 4.8 dB 5.9 dB 7.0dB
Buffer Clock Internal, External, Transmit, Recovered Rx
10-6 5.4 dB 6.6dB 7.8dB
On or Off
LNB Voltage +13 and +18 VDC per DiSEqC 4.2 and 24 VDC 10-7 6.0 dB 7.2dB 8.4dB
at 500 ma, max. 10-8 6.5 dB 8.0dB 9.2dB
LNB Frequency Reference Same as Modulator Outdoor Frequency Reference. T YPICAL EB/N0 PERF ORMANCE, CO NCAT ENAT ED REED-
ENVIRONMENT AL AND PHYSICAL SPECIF ICAT IO NS SOLOMON CODES
Prime Power 90 to 264 VAC, 47 to 63 Hz BPSK (1/2 Only), QPSK and OQPSK
1.75H x 19W x 19.18D inch (1 RU) BER 1/2 3/4 7/8
Size
(4.4H x 48.26W x 48.72D cm)
10-6 3.6 dB 4.6 dB 6.0 dB
Weight 12 lb. Maximum (5 kg)
Operating Temperature 0 to 50°C (32 to 122°F) 10-7 3.7 dB 4.8 dB 6.2 dB
Humidity Up to 95%, non-condensing 10-8 3.9 dB 5.0 dB 6.4 dB

ComTech EFData
2114 West 7th Street, Tempe, Arizona 85281 USA
480.333.2200 fax: 480.333.2161
web site: http://www.comtechefdata.com
ComTech EFData products are manufactured under a quality system
certified to ISO 9001.

ComTech EFData reserves the right to make changes to specifications of

products described in this data sheet at any time without notice and without
obligation to notify any person of such changes.

 2000 EFData Corp. (Part Number DS/SDM300L) 21-Jul-00