PSM-4900H Hybrid Satellite Modem
The PSM-4900H is Datum Systems' new low cost modem intended 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 output of an LNB to
eliminate the normal receive downconverter equipment. The transmit uses a standard 70 MHz
IF output eliminating the potential transmit problems of L-Band transmit
systems. The PSM-4900H Satellite Modem is manufactured for System Integrators and is available
with private labeling for volume customers.
This newly designed 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.
The PSM-4900H is a variable data rate programmable satellite modem with
70 MHz Transmit and L-Band Receive 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-4900H 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.
View the data sheet in HTML format here 4900H Data Sheet,
or
Download/View the data sheet in Adobe Acrobat (PDF) format
here 4900H PDF Download
Key Benefits
 | Lower cost than even the PSM-2100 or 512. |
| 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 50 to 90 MHz in 1Hz increments. Optional
100 to 180 MHz IF Available. |
| 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. |
| Control via IrDA link on the front panel. |
| 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. |
