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PSM-4900L Hybrid Satellite Modem

The PSM-4900L is the ultimate L-Band modem. Datum Systems designed this latest low cost modem specifically to build low cost VSAT type small stations. It matches the performance and features of the PSM-4900, 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. The PSM-4900L Satellite Modem is manufactured for System Integrators and is available with private labeling for volume customers.

This modem uses all of Datum Systems proprietary design technology implemented with the latest available parts to achieve the best performance and reliability possible at one of the lowest costs on the market. It is fully compatible with systems using both the standard or hybrid PSM-4900 units. Fully programmable options and parameters insure compatibility with virtually all modems currently manufactured.

The PSM-4900L is a variable data rate programmable satellite modem with 950 to 1750 MHz Transmit and 950 to 1900 MHz Receive L-Band IF. This digital modem is programmable for either BPSK or QPSK operation and can be used in a wide variety of system configurations. The standard PSM-4900L includes integral Viterbi Forward Error Correction, programmable data interfaces and built-in 1:1 redundancy capability. It can be outfitted with a variety of options like an IBS Multiplexer with AUPC and a concatenated Reed-Solomon FEC codec and the new high performance Turbo Product Codes FEC . External interface converters are available for Ethernet and G.703 T1 or E1.

The PSM-4900L contains an internal 10 MHz reference for an LNB and BUC which may be individually enabled or disabled as required. It uses internal power for standard LNB (13 or 18 Vdc up to 500 mA), and a supplied external power source which plugs into the unit rear panel for various BUC requirements. The standard supplied BUC power supply is 24 Vdc at up to 4 A, options include 12 or 48 Vdc for specific BUCs. The internal ±1 x 10-7 high stability, low phase noise OCXO and Bias-T circuitry insures good BUC performance.

View the data sheet in HTML format here 4900L Data Sheet, or
Download/View the data sheet in Adobe Acrobat (PDF) format here  4900L Datasheet

Key Benefits

  • Performance within 0.3 dB of theoretical.
  • NEW low cost, high performance Turbo Products Codes FEC available. See performance in Tech Note 6
  • Data rate programmable from 1200 bps to 4.92 Mbps in 1 bps increments.
  • Transmit IF frequency programmable from 950 to 1750 MHz in 1Hz increments. Optionally entering the BUC LO frequency allows setting directly at Transmit RF frequencies.
  • Receive IF frequency programmable from 950 to 1900 MHz in 1Hz increments. Optionally entering the LNB LO frequency allows setting directly at Receive RF frequencies.
  • DSP for fast acquisition of 315 milli-seconds at 9.6 kbps QPSK, 196 milli-seconds at 16 kbps QPSK.
  • Added programmability for compatibility with virtually any equipment complement.
  • Eight user defined complete configurations can be stored and recalled.
  • New Programmable IBS Multiplexer and Reed-Solomon Codec available
  • Built-in independent transmit and receive BERT.
  • Built-in 1:1 redundancy capabilities and logic requiring only an external splitter/combiner (for RF) and a "Y" cable for data.
  • 1 U rack mount unit with complete front panel and remote control.
  • Designed to accept newer interfaces and options, like Turbo Product Codes FEC and Ethernet Data Interfaces.