PSM-500LT L-Band Satellite Terminal for VSAT/SCPC

Datum Systems

PSM-500LT L-Band Satellite Terminal for VSAT/SCPC

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  • Internal BUC Power Supply Options (24Vdc or 48Vdc)
  • High Stability 10 MHz Reference
  • Data rates of 1.2 kbps to 29.52 MHz
  • Super Performance LDPC
  • Performance within 0.3 dB of Theoretical
  • DSP for fast acquisition of 315 ms at 9.6 kbps QPSK, 71 ms at 64 kbps QPSK
  • Built-in 1:1 Redundancy

SKU: DTM103 Tags: , ,
  • Description
  • Technical Specifications
  • Support Documents


The PSM-500LT Satellite Terminal is the newest addition to the M500 Series of modems. This terminal is based on the popular PSM-500L modem, but supports an integrated 24Vdc or 48Vdc power supply for small and medium size BUC applications. The PSM-500LT maintains all the latest features and options of the M500 series while providing reliable power to both BUC and LNB, and a high stability 10 MHz reference, all in a self contained 1 RU chassis that is only 13 inches deep.

The PSM-500LT uses all of Datum Systems proprietary design implementations to achieve the best performance and reliability in the industry. Reliability is achieved by smartly using the latest FPGA devices to reduce part counts and very efficient high quality power supplies. These supplies have high MTBF figures and lower operating temperatures than the competition uses today. Datum Systems understands the need for highly reliable modems, especially in very remote locations where it is both difficult and expensive to reach. In situations where redundancy is required, the PSM-500LT comes standard with a built in 1:1 redundancy feature that only requires a few combiner/dividers. The modem takes care of switching the BUC/LNB power and the High Stability 10 MHz Reference. This L-Band modem terminal has it all.


  • Designed for Performance and Reliability
  • Internal BUC Power Supply Options (24Vdc or 48Vdc)
  • High Stability 10 MHz Reference
  • Data rates of 1.2 kbps to 29.52 MHz
  • Low Cost High Performance Turbo Products Codes
  • Super Performance LDPC
  • Firmware Upgradeable to 8PSK/TCM, 8QAM and 16QAM Modulation modes
  • Performance within 0.3 dB of Theoretical
  • Bridge or Router Ethernet IP Interface
  • DSP for fast acquisition of 315 ms at 9.6 kbps QPSK, 71 ms at 64 kbps QPSK
  • Asynchronous Overhead Channel, AUPC and Remote Modem Control
  • Built-in 1:1 Redundancy

System Specifications
Operating Modes: Rx and Tx Continuous (SCPC), Optional Tx Burst
Tx Tuning Range: 950 to 1750 MHz, in 1 Hz Steps
Rx Tuning Range: 950 to 1900 MHz, in 1 Hz Steps
Data Rate Selection: 1 bps increments
Data Rate Minimum: 1.2 kbps rate 1/2 BPSK
Data Rate Maximum: 29.52 Mbps rate 3/4 8PSK
Data Rate Accuracy: Accurate to 2 x 10 –12 of relative clock reference
Symbol Rate Range: 2.4 ksps to 14.76 Msps in 1 bps step sizes
Available Modulation: BPSK, QPSK, OQPSK, 8PSK, 8QAM, 16QAM
Available TPC Modes: M5 Full, Short & Legacy, Comtech and Advanced
Concatenated RS: Selectable N & K, IESS 308/309/310 and CT Comp
Reed Solomon Depth: 4, 8 or 16
FEC Options
Viterbi - 1/2, 3/4, 5/6, 7/8 (k = 7) Trellis - 2/3
TPC-4K 1/2, 3/4, 7/8, 0.95, 21/44
TPC-16K 1/2, 3/4, 7/8, 0.922, 0.453
FlexLDPC 1/2 , 2/3, 3/4, 14/17, 7/8, 10/11, 16/17
Guaranteed Eb/No is 0.2 dB > Typical
Transmit Output Power: +5 to –35 dBm in 0.1 dB steps (max +3 dBm @ 50Ω)
IF Tx Impedance: 50Ω (Type N)
Return Loss: 14 dB typical, 10 dB minimum
Output Phase Noise: Better than IESS-308/309 by 6 dB typical, 4 dB min
Level Stability: ±0.5 dB, 0 ~ 50°C, MHz at 25°C
Level Accuracy: Accurate ±0.5 dB, 950 ~ 1750
Output Spurious: < -55 dBc/4 kHz, Typical < - 65 dBc/4 kHz
Carrier on/off Isolation: > 60 dB
Scrambler Types: IBS, V.35, IESS, TPC, RS, LDPC, EFD
Data Clock Sources: Internal, Terminal Timing, External, Rx Recovered
Internal Stability: 1 x 10 –8 OCXO (Standard)
External Reference: 1, 2,5 or 10 MHz input on rear panel
Transmit BUC Power: Nominal 24 VDC, 100 Watts (Or 12/36/48 VDC)
Max 60 VDC/6A up to 250 Watt
Transmit BUC Reference: 10 MHz at nominal – 3 dBm internal or external
Reference Stability: 1 x 10-8 OCXO, 2 x 10-7/ year aging (L-Band)
Reference Phase Noise: -110 dBc @ 10 Hz, -130 dBC @ 100 Hz, -140 dBc @ 1 kHz, -150 dBc @ 10 kHz, -155 dBc @ 100 kHz
Rx Carrier Input Range: -20 to -70 dBm, scales to -101 dBm at lower rates
(minimum = 10 log(symbol rate) – 135 dBm)
IF Tx Impedance: 75Ω Type F -Connector
Return Loss: 10 dB minimum
Max Composite Input: - 5 dBm or +40 dBc, whichever is lower power
Input Phase Noise: Better than Intelsat by 6 dB typical, 4 dB min
Rx Acquisition Range: Programmable from ± 100 Hz to ± 1.25 MHz
Descrambler Types: IBS, V.35, IESS, TPC, RS, LDPC, EFD
Fast Receive Lock Performance
Example: FEC ½, EB/N0 = 6.0 dB, Acquisition Range of ± 30 kHz
• 315 ms at 9.6 kbps QPSK
• 175 ms at 9.6 kbps BPSK
• 71 ms at 64 kbps QPSK
Plesiochronous or Doppler Buffer Store
Receive Buffer Range: 4 bits to 524,280 bits, in 1 bit steps or delay time
Receive Clock Options: Internal, External, Mod Clock, Receive Clock
Terrestrial Interfaces
Standard Synchronous: Serial RS232, RS422, V.35, V.36, EIA-530(A)
Optional: HSSI
Ethernet IP 10/100 Base-T (Bridge & Router, QoS)
TCP/IP Acceleration (Software Only)
-Supports Up to 5 Mbps Aggregate throughput and 200 Continuous Sessions
Advaned Ethernet IP, GigE, High PPS Throughput, Vyatta Bridge/Router
Dual G.703/E1 (D&I), Dual Bal Inputs (RJ-45), UnBal (BNC) Opt
Full E1, PCM-30 (CAS), PCM-31 (CCS), N X 64, N = 1 to 31 Time Slots
Multiplexer and Overhead Features
IBS Multiplexer: Built-in IBS Overhead Channel with standard and enhanced variable rate RS232 and RS485.
Supports Automatic Uplink Power Control (AUPC),
Remote Modem Control Interface and 2 Form-C Backward Alarms
Monitor and Control
Front Panel: LCD and Keyboard for easy control and status
Terminal Mode: Full screen interactive display of all parameters
Remote Packet Mode: Packet driven RS232/RS485 control and status
Optional Web Browser: Available through the Ethernet Interface SnIP
SNMP Available through the Ethernet Interface SnIP
Loopback Modes: IF, bi-directional terr and sat data loopbacks
BER Test Pattern: 2047 or 2 23-1
BERT: Built-in bi-directional bit error rate test set
Carrier: Pure carrier and sideband
Form C Relays: Assignable faults to Form C rear alarm connector
Environmental and Physical
Prime Power Input: 90 to 264 VAC, 50/60 Hz, -48 VDC (HW Option), < 30 watts,
220 Watts Max fully loaded including internal BUC and LNB power
BUC Power Options: 24 VDC @ 160 Watts, 5A max w/PFC
48 VDC @ 160 Watts, 3.2A max w/PFC
LNB Output Power: Selectable: Off, 13 or 18 VDC
Power Factor Correction: Optional at all power levels
Operating Conditions: 0 to 50°C, to 95% humidity, non-condensing
Storage Temperature: - 20 to +70° C, 99% humidity, non condensing
Size: Rack mount - 1 RU (19”W x 12”D x 1.75”H)
Weight: Approximately 7 lbs fully configured
Certifications and Compliance: CE Certified for: EN55022 Class B (Emissions)
EN50082-1 Part 1 (Immunity)
Can/CSA C222 No. 950-95 (Safety)
UL-1950 (Safety)
RoHS Compliant: Meets RoHS lead-free standards

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