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The DDT-4220 accepts up to four 270 Mb/s input
signals which may be ASI, SDI or a mixture of each
type. The signals need not be phase or frequency
synchronous.
The signals are time division multiplexed into a
single 1.302 Gb/s stream and transmitted via single
mode fibre to the DDR-4225 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 DDT-4220/DDR-4225 optical system is
primarily designed for use with a 9/125µm single
mode fibre and will allow an optical path loss from
4dB up to 32dB.
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An optional Simple Network Management Protocol
(SNMP) plug-in module is available for remote
monitoring of input and output status and alarm
states.
The DDT-4220 transmitter comes available with a
choice of standard 1310nm laser (order code
DDT-4220/1300) or a DFB 1550nm laser (order code
DDT-4220/1550). Other wavelengths are available
on request. The DDR-4225 receiver is the same
regardless of transmitter wavelength.
The modules are designed to fit IRT’s standard
Eurocard frames as well as IRT’s 4000 series frame
for use with IRT’s SNMP system and may be used
alongside any other of IRT’s analogue or digital
Eurocards.
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