Meinberg SDU - Manual (Page 6)

6
TTL Distribution Card SDU/TTL
The Board SDU/TTL was designed for the distribution of TTL signals. The input
connection is a BNC connector, the input signal is driven to twelve output buffers, which
are capable of driving 50 Ohm loads. The signal outputs are available via BNC
connectors.
The SDU/TTL contains a ERROR detection for losing signal output, this ERROR
state is signed by the Alarm LED on the front panel, and by the ERROR output
connector on the back panel. For correct error detection on a PPS signal, a minimum
pulse width of 100ms is required, shorter pulse width signals are possible on request.
The insulated input by opto-coupler device is optional possible.
During "OK" State the connection of the Relay is between: comm - on
During "ERROR" State the connection of the Relay is between: comm - off
Specification:
Inputs: TTL Signal (IRIG_DC, PPS, 10MHz, ...)
Isulation by opto-coupler (option)
Input Voltage Range: TTL
Outputs: 12 x TTL
Output Voltage Range: TTL
Output Impedance:
2.5Vat 50 Ohm load
common GND for all outputs
Connectors: 1 x BNC- Connector Inputsignal
12 x BNC- Cconnector Outputsignal