IRT Electronics DDR-3220, Instruction Book

Page: 8 / 20

3220-ddt & 3220-ddr.ib.doc
Page 8 of 12
24/03/2004
Operation
Up to four ASI, SDI or a combination both are connected to the input 75
Ω
BNC connectors on the rear assembly
of the DDT-3220 four channel mux transmitter. Each of the inputs must be 270 Mb/s. These input signals do not
need to be synchronous with each other. Unused inputs should be terminated with 75
Ω
terminations so as to
suppress any spurious noise that may be generated on an unterminated input.
Multiplexed signal is then optically transmitted at 1.302 Gb/s .
The DDR-3220 Demultiplexer detects the optical signal and then de-multiplexes it. Outputs, in the same order to
the inputs, appear on the 75
Ω
BNC connectors on the rear connector panel.
As well as ASI or SDI inputs, a dedicated RS-422 port is provided on each of the units for transmission with the
other input signals.
Alarms & Indicators:
DDT-3220:
Urgent Alarm relay contact closure for loss of power, Tx lock error or laser fail;
Non-urgent Alarm contact closure if no channels are present;
Channel 1 presence indicator (green LED);
Channel 2 presence indicator (green LED);
Channel 3 presence indicator (green LED);
Channel 4 presence indicator (green LED);
Tx lock error or laser fail (red LED);
DC power (green LED);
DDR-3220:
Urgent Alarm relay contact closure for loss of power, Rx lock error or loss of optical
input;
Non-urgent Alarm relay contact closure if no channels are present;
Channel 1 presence indicator (green LED);
Channel 2 presence indicator (green LED);
Channel 3 presence indicator (green LED);
Channel 4 presence indicator (green LED);
Rx lock error or loss of optical input (red LED);
DC power (green LED);