DDT 4620 & DDR Brochure DDT_4620 DDR_bro Bro
User Manual: 4620-DDT_4620-DDR_bro
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DDT-4620 & DDR-4620
FEATURES
• One type covers 2.97 Gb/s 3G-SDI,
1.485 Gb/s HD-SDI or 270 Mb/s SD-SDI
& ASI signals.
• Path lengths up to 30 dB
1
optical path
loss using 9/125μm single mode fibre
.
• LED indicators and external alarm
contacts
.
• Fibre, video and alarm connections at
rear
.
• Optional plug-in SNMP monitoring
module.
GENERAL
The IRT DDT-4620 and DDR-4620 are
transmit and receive modules 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
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 features automatic input
cable equalisation. The unit can be
configured with lasers of various wavelengths.
LED indicators are provided for digital
signal presence, DC power and LASER
output power out of range.
A link selectable “keep link alive” signal is
available to maintain optical link operation
when no electrical input is present.
The receiver 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 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, signal type, optical loss and
power.
Relay contact outputs are also provided for
external use of alarm signals on both
modules.
An optional SNMP (Simple Network
Management Protocol) plug-in module is
available, for each unit, for remote
monitoring when used in conjunction with
an IRT frame fitted with SNMP capability.
Both the DDT-4620 and DDR-4620 are
Eurocard modules designed to fit IRT’s
current range of 1RU 1000 series and 3RU
4000 series Eurocard frames.
3G/HD/SD
-
SDI/ASI
Fibre Optic Link
BLOCK DIAGRAM
DDT
-
4620 & DDR
-
4620
SIGNAL PATH
3G-SDI
HD-SDI
SD-SDI
ASI 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.
DDT-4620
I/P
Fibre O/P
Alarm O/P
DDR-4620
O/P 1
O/P 2
Fibre I/P
Alarm O/P
3G-SDI
HD-SDI
SD-SDI
ASI
SNMP SNMP
1
27dB path loss at 3G. Typically >30dB at HD and SD.
Fitted with APD detector.
No Longer Available -
For Reference Purposes Only
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DDT-4620 & DDR-4620
TECHNICAL SPECIFICATIONS
DDT-4620:
Input serial data signal 2.97 Gb/s (3G-SDI) to SMPTE 424M;
1.485 Gb/s (HD-SDI) to SMPTE 292M;
270 Mb/s (SD-SDI) to SMPTE 259M and DVB-ASI.
Input impedance 75 Ω.
Input return loss > 15 dB 5 MHz to 1.5 GHz;
> 10 dB 1.5 GHz to 2.97 GHz.
Automatic Cable compensation > 100 m at 2.97 Gb/s with Belden 1694A (typ. 130m);
> 100 m at 1.485 Gb/s with Belden 1694A (typ. 170m);
> 250 m at 270 Mb/s with Belden 8281 (typ. >300m).
Input Connector 1, BNC on rear panel.
DDR-4620:
Number of outputs 2 data reclocked,
AC coupled.
Output level 800 mV ± 10%.
Output impedance 75 Ω.
Output return loss > 15 dB 5 MHz to 1.5 GHz;
> 10 dB 1.5 GHz to 2.97 GHz.
Output Rise and Fall Time < 135 ps at 2.97 Gb/s and 1.485 Gb/s;
> 0.4 ns and < 1.5 ns at 270 Mb/s.
Intrinsic Jitter < 0.3 UI at 2.97 Gb/s reclocked;
< 0.2 UI at 1.485 Gb/s reclocked;
< 0.2 UI at 270 Mb/s reclocked (typically < 0.1 UI).
Output Connector 2, BNC on rear assembly.
Optical:
DDT-4620 optical output 0 dBm +4.5/-0 dB CWDM DFB laser.
DDR-4620 optical input APD detector, -9 to -27 dBm input level at 3G-SDI, typically < -30 dBm at HD/SD-SDI.
PIN detector, -3 to -18 dBm input level.
Available wavelengths CWDM DFB laser - 1270nm, 1290nm, 1310nm 1330nm, 1350nm, 1410nm, 1430nm, 1450nm,
1470nm, 1490nm, 1510nm, 1530nm, 1550nm, 1570nm, 1590nm & 1610nm.
Optical path loss
2
9 to 27 dB at 3G-SDI, typically >30 dB at HD/SD-SDI, APD detector;
3 to 18 dB PIN detector.
(Optical path loss = Laser O/P power – Detector I/P power)
Optical fibre Designed for use with 9/125 μm single mode fibre.
Optical connectors SC/PC (standard).
Power Requirements:
Voltage 28 Vac CT (14-0-14) or ±16 Vdc.
Power consumption DDT-4620 <4.0 VA, DDR-4620 <4.5 VA.
Other:
Temperature range 0 - 50° C ambient.
Mechanical For mounting in IRT 19" rack chassis with input, output and power connections on the rear panel.
Finish Front panel Grey, black lettering & red IRT logo.
Rear assembly Detachable silk-screened PCB with direct mount connectors to Eurocard and external signals.
Dimensions 6 HP x 3 U x 220 mm IRT Eurocard.
Optional accessories SMU-4000 SNMP plug in module for use with 4000 series frame fitted with SNMP “Agent”.
NOTE: 2 Typical values based using DFB laser. Optical attenuator supplied for DDR-4620 when optical path
loss is less than 3dB for PIN detector and 9dB for APD detector.
No Longer Available - For Reference Purposes Only
