DDT-4691 & DDR-4691:   ASI / SDI 8 Channel MUX Fibre Link.

FEATURES:

      270 Mb/s type signals, such as ASI and SDI, capability.
      Automatic cable equalisation for up to 300m on each input.
      Optical path loss ≥ 27dB.
      External urgent and non-urgent alarms for system monitoring.
      SNMP monitoring module built in.

Brochure  

User Manual  

APPLICATIONS:

      Multichannel digital on a single fibre.
      Upgrade capacity of existing fibre.
      Maintain timing between related signals by ensuring same path transmission delay.

GENERAL:

The DDT-4691 accepts up to eight 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 multiplexed into a single 2.97 Gb/s stream and transmitted optically via a single mode fibre. The DDR-4691 receiver performs the reverse operation and restores correct 270 Mb/s timing.

The DDT-4691/DDR-4691 system is primarily designed for use with a 9/125µm single mode fibre and will allow an optical path loss up to 27dB.

The DDT-4691 transmitter comes standard with a 1310nm DFB laser. Other CWDM wavelengths are available. The DDR-4691 receiver comes standard with an APD detector.

SNMP (Simple Network Management Protocol) is available for monitoring and control when used in an IRT frame fitted with SNMP capability. Channels can be individually enabled or disabled via SNMP.

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.


TECHNICAL SPECIFICATIONS:

DDT-4691:
Inputs:
Type
8 x independent ASI or SDI.
Equalisation
Automatic for up to 300 m of Belden 8281 or equivalent cable.
Connectors
 BNC 75 Ω.

Outputs:
Type
1 x 2.97 Gb/s optical.

Alarms:
Major
O/C relay for loss of power, or LASER fail.
Minor
O/C relay if no channels are present.

DDR-4691:
Inputs:
Type
1 x 2.97 Gb/s optical.

Outputs:
Type
8 x independent ASI or SDI.
Connectors
BNC 75 Ω.
Type
1 x RS-232 uni-directional.

Alarms:
Major
O/C relay for loss of power, or optical input fail.
Minor
O/C relay if no channels are present.

Optical:
DDT-4690 optical output
0 dBm +4.5/-0 dB CWDM DFB laser,.
DDR-4690 optical input
APD detector (standard), -9 to -27 dBm input level.
Available wavelengths
CWDM DFB laser - 1270nm, 1290nm, 1310nm (standard), 1330nm, 1350nm, 1410nm, 1430nm, 1450nm, 1470nm,
1490nm, 1510nm, 1530nm, 1550nm, 1570nm, 1590nm & 1610nm.
Optical path loss1
9 to 27 dB APD detector (standard),
3 to 18 dB PIN detector.
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-4691 <6.5 VA, DDR-4691 <6 VA.

Other:
Temperature range
0 - 50°C ambient.
Mechanical
Suitable for mounting in IRT 19" rack chassis with all connections at the rear.
Finish:             Front panel
Grey 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.

                       NOTE: 1
Optical attenuator supplied for DDR-4691 when optical path loss is less than 9dB.



                   



Due to our policy of continuing development, these specifications are subject to change without notice.