DDT-4638 & DDR-4638
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Page 7 of 17
Revision 01
TECHNICAL SPECIFICATIONS
DDT-4638:
Inpu serial da a signal 1.485 b/s (HD-SDI) to SMPTE 292M;
270 Mb/s (SD-SDI) to SMPTE 259M and DVB-ASI.
Inpu impedance 75 Ω.
Inpu re urn loss > 15 dB 5 MHz to 1.5 Hz
Au oma ic Cable compensa ion > 30 m at 1.485 b/s with Belden 1694A (typ. 170m);
> 50 m at 270 Mb/s with Belden 8281 (typ. > 300m).
Inpu Connec or 8 (1 per channel), BNC on rear panel.
DDR-4638:
Number of ou pu s 8 (1 per channel) data reclocked,
AC coupled.
Ou pu level 800 mV ± 10%.
Ou pu impedance 75 Ω.
Ou pu re urn loss > 15 dB 5 MHz to 1.5 Hz
Ou pu Rise and Fall Time < 135 ps at 2.97 b/s and 1.485 b/s;
> 0.4 ns and < 1.5 ns at 270 Mb/s.
In rinsic Ji er < 0.2 UI at 1.485 b/s reclocked;
< 0.2 UI at 270 Mb/s reclocked (typically < 0.1 UI).
Ou pu Connec or 8 (1 per channel), BNC on rear assembly.
Op ical:
DDT-4638 op ical ou pu 0 dBm +4.5/-0 dB CWDM DFB laser.
DDR-4638 op ical inpu APD detector, -5 to -24 dBm input level
PIN detector, <-14 dBm input level.
Op ical aveleng hs CWDM DFB laser - 1610nm, 1590nm, 1570nm 1550nm,
1530nm, 1510nm, 1490nm & 1470nm.
Op ical pa h loss
1
APD detector 5 to 24 dB, typically > 27 dB
PIN detector <14 dB, typically >18 dB
(Optical path loss = Laser O/P power – Detector I/P power)
Op ical fibre Designed for use with 9/125 µm single mode fibre.
Op ical connec ors 1, SC/PC on rear assembly.
Power Requiremen s:
Vol age 28 Vac CT (14-0-14) or ±16 Vdc.
Power consump ion <6.0 VA
O her:
Tempera ure range 0 - 50° C ambient.
Mechanical For mounting in IRT 19" rack chassis with input, output and power
connections on the rear panel.
Finish Fron panel rey background, 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.
Op ional accessories SMU-4000 SNMP plug in module for use with 4000 series frame fitted with
SNMP “Agent”.
NOTE: 1 Typical values based using DFB laser. Optical attenuator required for
DDR-4638 when optical path loss is less than 9dB for APD detector.
Due to our policy of continuing development, these specifications are subject to change without notice.
