DTR-4630
I.R.T. Communications Pty Ltd | www.irtcommunications.com
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Revision 02
GENERAL DESCRIPTION
The IRT DTR-4630 is a transmit/receive (transceiver) module designed principally for use as a serial data fibre optic
transmission link for 3G-SDI, HD-SDI or SD-SDI applications conforming to SMPTE standards 424M, 292M and 259M-C
using 9/125 μm single mode fibre. This enables the use of space saving fibre optic cable for reliable transmission of
digital video signals over lengths greater than can be achieved with coaxial cable.
In addition, the link may be used for ASI transport streams for use with MPEG compressed video streams or other
270 Mb/s type data.
The transmitter section features automatic input cable equalisation. LED indicators are provided for digital signal
presence and rate, DC power and LASER failure.
A “keep link alive” signal is available to maintain optical link operation when no electrical input is present.
Two inputs are provided with automatic changeover to input 2 on loss of input 1 for input signal redundancy.
The receiver section uses a choice of either a PIN photodiode or APD detector with signal conditioning and reclocking
circuits. The data rate is automatically set to match the 3G-SDI, HD-SDI or SD-SDI/ASI rates dependent on the actual input
data rate to the transmitter.
Two serial digital outputs are provided. LED indicators are provided for digital signal presence & type, optical loss and
power.
Relay contact outputs are also provided for external use of alarm signals.
The DTR-4630 can be used as an independent transmitter and receiver at the same time allowing bi-directional
operation over two single mode fibres. Being independent from each other, the transmit and receive signals can be of
mixed signal types.
Optionally a 1310/1550nm WDM
2, 3
optical combiner can be fitted to allow for combined use on a single fibre.
SNMP (Simple Network Management Protocol) is available for remote monitoring when used in conjunction with an IRT
frame fitted with SNMP capability.
Standard features:
•
Transports 3G-SDI, HD-SDI, SD-SDI or ASI signal rates.
•
Single or bi-directional operation possible with independent transmit and receive functions on the one card.
•
Path lengths up to 30 dB
1
optical path loss using 9/125μm single mode fibre.
•
Automatic changeover switching of input for signal redundancy on Tx.
•
LED indicators and external alarm contacts.
•
Fibre, video and alarm connections at rear.
•
Remote monitoring via SNMP.
•
Optional on-board WDM
2, 3
optical combiner for use on a single common fibre.
NOTE:
1
27dB path loss at 3G. Typically >30dB at HD and SD. Fitted with APD detector.
2
With WDM option fitted for combined use on a single fibre, optical path loss is reduced by approximately 2dB.
3
With WDM option fitted, when operating as a pair, one DTR-4630 must be fitted with a 1310nm laser and
the other a 1550nm laser.
BLOCK DIAGRAM DTR -4630 SIGNAL PATH
Fibre Link
9-27
*
dB path loss at 3G
(>30dB at HD and SD)
NOTE: * Fitted with APD detector. 3-18dB when fitted with PIN detector.
DTR-4630
(Tx/Rx)
I/P 1
I/P 2
Fibre O/P
Fibre I/P
O/P 1
O/P 2
Alarm O/P
DTR-4630
(Tx/Rx)
O/P 1
O/P 2
Fibre I/P
Fibre O/P
I/P 1
I/P 2
Alarm O/P
SNMP
SNMP
3G-SDI
HD-SDI
SD-SDI
ASI
3
G-SDI
HD-SDI
SD-SDI
ASI
3G-SDI
HD-SDI
SD-SDI
ASI
3G-SDI
HD-SDI
SD-SDI
ASI