900-series Modular Distribution System Overview
The 900 series is a range of high-reliability modules which are used to build versatile signal distribution systems. The use of ultra-low-noise Power Supplies, enclosed module construction and co-axial cable for interconnections means that the units have excellent noise, emissions and immunity characteristics.

Typical applications are in installations where ‘round the clock’ reliability is a must. Examples include manufacturing plants for items such as mobile communications equipment and cellular base stations, both military and commercial. More generally the 900 series has applications in development laboratories, support workshops and calibration areas.

The 900 series units can also be found in many satellite ground stations, running up/down links from the Poles to the Tropics. The 900 series can be widely configured with distribution of a variety of reference frequencies, 1-pps timing and various timecodes. Up to 30 individually buffered outputs at +13 dBm (1V rms in 50 Ω) is available from one 3U high cabinet. Continuous un-interrupted operation is assured via auto-changeover input modules, allowing redundant frequency sources to be used. Dual, hot-swappable power supply modules provide power redundancy.

All modules have built in test and can detect faults down to individual output level.
Alarms are consolidated in the rack PSU module and transmitted by relay output. Automatic signal source changeover is provided by some modules. This facility can be controlled manually by a front panel rotary switch, or remotely via a commercially available I/O to Ethernet adapter.

Wide range of modules available:

• 900 RACK ASSEMBLY 19" subrack fully wired for modules
• 909 STANDARD DISTRIBUTION sinewave or timecode up to +13dBm
• 910 INPUT/CONDITIONING/SIGNAL-SPLIT 6 outputs
• 911 POWER MODULE ac input, dc outputs power a full cage
• 919 HIGH LEVEL SINEWAVE DISTRIBUTION up to +22.5dBm
• 920 FREQUENCY DOUBLER 5 to 10MHz
• 922 RS422 DISTRIBUTION 6 outputs BNO RS422
• 930A UNIVERSAL FIBRE TRANSCEIVER 2x inputs of IRIG, Timecode, NMEA, Logic or Rapco Opto, 2x outputs of logic and Opto on Fibre connectors
• 980 AUTO CHANGEOVER Manual & Remote control