3220-ddt & 3220-ddr.ib.doc
Page 4 of 12
24/03/2004
IRT Eurocard
Types DDT-3220 & DDR-3220
ASI / SDI 4 Channel Multiplexer / De-Multiplexer
Fibre Optic Link
General Description
The DDT-3220 accepts up to four 270 Mb/s input signals which may be ASI, SDI, SDDI, or any 270Mb/s signals -
or a mixture of each type. The signals may be asynchronous to each other.
The signals are time division multiplexed into a single 1.302 Gb/s stream for transmission via single mode fibre to
the receiver, which performs the reverse operation and restores correct 270 Mb/s timing.
In addition to the four 270 Mb/s channels, a single RS422 channel is included for transmission of auxiliary data at
rates of up to 9600 baud.
The modules are in IRT standard Eurocard format and may be used in any standard IRT frame alongside other IRT
analogue and digital modules.
Standard features:
•
ASI and SDI capability.
•
Automatic cable equalisation for up to 200 m on each input.
•
Maximum optical path loss of 20 dB.
•
External urgent and non-urgent alarms for system monitoring.
Applications:
•
Multichannel digital with data on a single fibre.
•
Upgrade capacity of existing fibre.
•
Maintain timing between related signals by ensuring same path transmission
delay.
DDT-3220
DDR-3220
0 dBm – 20 dBm
1310 nm
RS 422
< 9600 baud
RS 422
< 9600 baud
Any 270 Mb/s
± 100
ppm
