DDT-4638 & DDR-4638:   8-Ch HD/SD-SDI/ASI Fibre Optic Link

FEATURES:

      8 independent fibre links.
      Transports  HD-SDI, SD-SDI or ASI signal rates.
      Path lengths up to 30 dB1 optical path loss using 9/125µm single mode fibre.
      LED indicators and external alarm contacts.
      Transmitter (Tx) and receiver (Rx) can be used separately with 8 independent
         single channel fibre Rx and Tx cards.
      Remote monitoring via SNMP.
      Optional on-board CWDM2 optical combiner for use on a single common fibre.

Brochure  

User Manual  

GENERAL:

The IRT DDT-4638 and DDR-4638 are 8 channel transmit and receive modules designed principally for use as eight independent serial data fibre optic transmission links for  HD-SDI or SD-SDI applications conforming to SMPTE standards  292M and 259M-C using 9/125 µm single mode fibre

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 and comes standard with 1470 nm to 1610 nm (spaced at 20nm) lasers. Other wavelength combinations are available on request.

The receiver uses a choice of either a PIN photodiode or APD detectors with signal conditioning and reclocking circuits. The data rates are automatically set to match the  HD-SDI or SD-SDI/ASI rates dependent on the actual input data rates to the transmitter.

The transmitter and receiver modules are compatible with IRT's single channel fibre cards for use as eight independent fibre paths starting from or coming to a single location.

LED indicators are provided on both modules for digital signal presence and power.

Optionally a CWDM2 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.


NOTE: 1 27dB path loss at 3G. Typically >30dB at HD and SD. Fitted with APD detector.
           2 With CWDM option fitted for combined use on a single fibre, optical path loss is reduced by
              approximately 2.5dB.


 


 

TECHNICAL SPECIFICATIONS:

DDT-4638:
Input serial data signal
1.485 Gb/s (HD-SDI) to SMPTE 292M;
270 Mb/s (SD-SDI) to SMPTE 259M-C and DVB-ASI.
Input Impedance
75 Ω.
Input Return Loss
> 15 dB 5 MHz to 1.5 GHz;
Automatic Cable
      Compensation
> 100 m at 1.485 Gb/s (HD-SDI) with Belden 1694A
(typ. 160m);
> 250 m at 270 Mb/s (SD-SDI/ASI) with Belden 8281
(typ. > 300m).
Input Connector
 8 x BNC on rear panel, 1 per channel.
DDR-4638:
Number of Outputs
1 per channel, data reclocked, AC coupled.
Output Level
800 mV ± 10%.
Output Impedance
75 Ω.
Output Return Loss
> 15 dB 5 MHz to 1.5 GHz.
Output Rise and Fall Time
< 135 ps at  1.485 Gb/s;
> 0.4 ns and < 1.5 ns at 270 Mb/s.
Intrinsic Jitter
< 0.2 UI at 1.485 Gb/s reclocked
Output Connector
8 x BNC on rear assembly, 1 per channel.
Optical:
DDT-4638 Optical Output
0 dBm +4.5/-0 dB CWDM DFB laser.
DDR-4638 Optical Input
APD detector,  typically < -30 dBm at HD/SD-SDI.
PIN detector,  typically < -20 dBm at HD/SD-SDI.
Available Wavelengths
CWDM DFB laser - 1510nm, 1530nm, 1550nm & 1570nm (standard).
Other wavelengths combinations available on request.
Optical Path Loss3,4
Typically >30 dB at HD/SD-SDI, APD detector;
Typically >20 dB at HD/SD-SDI, 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 Connector
8 x LC/PC (standard) on rear - direct connection to main card, 1 per channel;
1 x SC/PC (standard) with CWDM option fitted.
Power Requirements:
Voltage
28 Vac CT (14-0-14) or ±16 Vdc.
Power consumption
DDT-4638 < 6.0 VA, DDR-4638 < 6.5 VA.
Other:
Temperature range
0 - 50°C ambient.
Mechanical
Suitable for mounting in IRT 19" rack chassis with input, output and power connections on the rear panel.
Finish:             Front panel
Grey background, black lettering & red IRT logo.
                        Rear Panel
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
On-board 1470 -1610 nm CWDM combiner - SC/PC optical connector (standard).
                        CWDM Order Codes
DDT-4638/CWDM & DDR-4638/CWDM.
                        NOTE 3:
Typical values based using DFB laser. Optical attenuators supplied for DDR-4638 when optical path loss is less than 3dB for PIN detector and 9dB for APD detector.
                                  4:
With CWDM option fitted for combined use on a single fibre, optical path loss is reduced by approximately 2.5dB.


 
         
 
                                                                                        
DDT/DDR-4638:
Rear Assembly
 
Due to our policy of continuing development, these specifications are subject to change without notice.