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Datum PSM-500LT L-Band Satellite Terminal Modem

Datum PSM-500LT L-Band Satellite Terminal Modem

The PSM-500L is the ultimate L-Band modem. Datum Systems designed this latest low cost modem specifically for small low cost VSAT type earth stations. It matches the performance and features of the PSM-500, but connects directly to the L-Band input of a BUC and output of an LNB to eliminate the normal expensive transmit and receive converter equipment. This modem uses all of Datum Systems proprietary design technology implementations to achieve the best performance and reliability in the industry. The PSM-500 is the best modem value available.

Product Code: PSM-500LT

Key Highlights

• FlexLDPC Multi Block Sizes & Code Rates
• External BUC Power Flexibility
• High Stability 10 MHz Reference
• 1.2 kbps to 29.5 Mbps
• TPC, Viterbi, TCM, Reed Solomon
• Most FEC Types and Modcods
• Ethernet IP Interface
• Bridge and Router Modes, QoS
• SCPS - TCP/IP Acceleration
• Lowest Latency, <15 ms at 64 kbps ¾ QPSK
• Typical acquisition time, 71 ms at 64 kbps
• Async Channel, AUPC
• Remote Modem Control Channel
• Tx Output of 40 dB, +5 to –35 dBm
• Optional SNMP Remote Interface
• Web Browser GUI


• Cellular Backhaul
• Enterprise
• IP Networks
• On-the-Move
• Bandwidth on Demand

• Point-to-point
• Point-to-Multipoint
• Mesh
• Multicasting
• UniDirectional


Advanced FlexLDPC – With unparalleled conguration exibility and
superior coding gain, FlexLDPC takes FEC technology innovation
to the next level, bringing strong economic advantages to satellite
service providers and their customers. Granular code rates and block sizes
get you the most out of your available satellite bandwidth and spectral
power, while keeping processing latency at the desired level.

SCPS TCP/IP Acceleration – Datum Systems provides an embedded
protocol acceleration option based on the Space Communication
Transport Specication (SCPS-TP). Our integrated optimization
software provides increases in IP packet throughput over TCP/IP
links via our Ethernet IP interface option.

BUC/LNB Power & Reference – The PSM-500LT provides BUC and LNB
power from an integrated power supply.

A High Stability10 MHz reference is also provided through the modem
Transmit (N-Type) and Receive (F-Type) connections at the rear. Reference,
BUC and LNB power may be disabled via the front panel. Front panel voltage
and current measurements are available for BUC and LNB monitoring.

Easy Feature Unlocks – The PSM-500LT can be easily upgraded via front
panel key codes. Upgrades are simple to implement and are available
in precongured software versions, oering a variety of options
for modulation, FEC and data rates up to 29.5Mbps.

Redundancy Built-in 1:1 redundancy comes standard on the
PSM-500LT and supports BUC/LNB power and reference switching.
It can be enabled through the front panel and requires only a few
external cables and power splitters.

System Specications:

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

Transmit Output Power: +5 to –35 dBm in 0.1 dB steps (max +3 dBm @ 50)
IF Tx Impedance: 50 (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/ o 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 r
(minimum = 10 log(symbol rate) – 135 dBm)
IF Tx Impedance: 75 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 Buer Store:
Receive Buer Range: 4 bits to 524,280 bits, in 1 bit steps or delay time
Receive Clock Options: Internal, External, Mod Clock, Receive Clock


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
External BUC Supply: Input 115/230 VAC, 50 / 60 Hz
BUC Power Options:: (1) 24 VDC @ 160 Watts, 5A max
                                        (2) 48 VDC @ 160 Watts, 3.2A max
LNB Output Power: Selectable: O, 13 or 18 VDC
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)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)
SCPS TCP/IP Acceleration (Software Only)
-Supports Up to 5 Mbps Aggregate throughput
and 200 Continuous Sessions