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MDC-3661: 2 Mb/s (E1) G.703 / ASI Network Interface Adapter.

FEATURES:

      2 Mb/s (E1) G.703 input to ASI output.
      ASI input to 2 Mb/s (E1) G.703 output.
      Selectable ASI program number.
      AIS signal generated when no input is present.

Brochure  

User Manual  

GENERAL:

The MDC-3661 takes a 2048 kb/s G.703 (E1) signal and packs it as private data into a DVB compliant, 188 or 204 byte (selectable), ASI transport stream. On board switch settings set the ASI program number to a choice of 8 settings. This allows it to pass through ASI style of circuits such IRT's ASI Mux/DeMux and fibre modules as well as ASI statistical multiplexers.

The MDC-3661 will also simultaneously decode an appropriate ASI input into 2048 kb/s G.703 (E1).

In the absence of an ASI input, the G.703 output is AIS (Alarm Indication Signal). In the absence of a valid G.703 input, AIS is packed into a 188 or 204 byte (selectable) ASI transport stream.

For the G.703 input, front panel LEDs indicate if a G.703 input is present and if it is AIS. For the ASI input, front panel LEDs indicate if the ASI is present, if the ASI is at the correct input rate, if there is a sync error, or if the program number of input signal is missing or does not match the on board switch setting.

External relay contact alarms also are available on the rear connector assembly.

The MDC-3661 is suitable for mounting in all IRT's standard 1RU and 3RU frames.


TECHNICAL SPECIFICATIONS:

Input 1:
Type
1 x G.703.
Electrical characteristics
HDB3 encoded.
Data rate
 2048 kb/s (E1).

Output 1:
Type
 1 x ASI-C, 75 Ω, 188 or 204 Byte (selectable), (distributed).
Data rate
 2.831 Mb/s for 188 byte, or 3.072 Mb/s for 204 byte (nominal).
Impedance
 75 Ω.
Level
 800 mVp-p.
Program Number
 Selectable from 3661 (0E4D) to 3668 (0E54).

Input 2:
Type
1 x ASI-C, 75 Ω, 188 or 204 Byte (distributed or contiguous).
Data rate
2.831 Mb/s for 188 byte, or 3.072 Mb/s for 204 byte (nominal).
Return loss
>15 dB 5 MHz to 270 MHz.
Equalisation
Automatic, better than 300 metres at 270 Mb/s for Belden 8281 or equivalent cable.
Program Number
Selectable from 3661 (0E4D) to 3668 (0E54).

Output 2:
Type
1 x G.703.
Electrical characteristics
HDB3 encoded.
Data rate
 2048 kb/s (E1).

Alarms:
2 x general alarm                         -
Relay 1 releases on ASI Sync loss, incorrect ASI rate, incorrect program number, or power loss.
                                                     -
Relay 2 releases on G.703 input loss, or power loss.
2 set relay contacts - N/O1, N/C1, N/O2, N/C2, Com.
5 pin phoenix style connector.

Power Requirements:
Voltage
28 Vac CT (14-0-14) or ±16 Vdc.
Power consumption
< 4 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 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.




       



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