Datum Systems employees have been in the satellite communications business for  more than 25 years. We have attached several tech and application notes here for reference to visitors. These Tech Notes are no longer kept in numerical order, so that newer (perhaps more relevant) notes appear closer to the top.

Tech Note - M500 Performance Curves
This Waterfall page shows selected operating 'Waterfall' curves of performance in BER vs. Eb/No format.

Tech Note - Bits, Symbols, Modulation and Coding
This Tech Note describes the relationship between the common terms used to describe the performance of digital modems.

Tech Note - Synchronizing Link Data Rates
This Tech Note describes some common methods of achieving data rate synchronization over a link and pitfalls to avoid.

Tech Note - Modem Carrier Tracking Rates
This Tech Note describes some common methods of achieving data rate synchronization over a link and pitfalls to avoid.

Tech Note - Simulating a Satellite Link with Delay on the Bench
How to simulate a satellite link, complete with delay, on the bench using two modems.

Tech Note - Connecting M5 Modems to Routers (PDF File only) Revised 1/2008 with HSSI info.
How to connect to Cisco Routers (and others) including modem settings, clocks and cables.

Tech Note - How to Update the SnIP kernel and Root Filesystem (PDF version available)