MMM-4711 & MMX-4711: 4 ASI to ASI Combiner / DeCombiner.

FEATURES:


      Up to 4 ASI streams on one ASI link.
      Units may be cascaded to increase the number of ASI inputs.
      Recovers transmitted ASI signal without any added PCR jitter and with minimal user              setup.
      Maintains original ASI rate, packet size & coding (energy dispersal scrambling,                        interleaving or Reed Solomon bytes).
      Suitable for Single Frequency Networks (SFN).

Brochure  

User Manual  

GENERAL:


The MMM-4711 and MMX-4711 are part of a family of data transcoders for converting between the commonly used MPEG2 Transport Stream formats for video distribution in the broadcast industry.

With the MMM-4711 up to four ASI signals can be combined together and converted into a single ASI signal with a settable output payload rate.

The sum of the ASI input payload rates can be anything up to approximately 0.9* x the set ASI output payload rate. Inputs may be 188 or 204 byte packet lengths, burst or continuous, and may have energy dispersal scrambling, interleaving and/or Reed Solomon bytes included. An individual input may be up to 0.9* x the full set ASI output payload rate if the other inputs are unused.

The output ASI stream is a valid stream, which complies with all facets of ETR290.

Provided the total sum of the ASI inputs does not exceed approximately 0.9* x the set output rate, units can be cascaded to increase the number of ASI inputs into a single ASI output.

The MMX-4711 separates the combined ASI signal back into the original four ASI signals (at their original rates and without any modification of the stream, or stream timing). If more than one MMM 4711 has been cascaded then the MMX 4711's cascade in the reverse order.

Inputs are automatically equalised for lengths of up to 250m of Belden 8281 or equivalent cable.

Front panel indication and relay alarm on the MMM 4711 transmitter shows if there is an input data rate violation. Corresponding alarm on the MMX 4711 receiver shows a loss of ASI input.

The MMM-4711 and MMX-4711 are designed to fit IRT's standard Eurocard frames and may be used alongside any other of IRT's analogue or digital Eurocards.



NOTE *: 0.95 x with 188 byte inputs, 0.88 x with 204 byte inputs.


TECHNICAL SPECIFICATIONS:


MMM-4711:
Inputs:
Type 1
4 x ASI-C 75 Ω, 800 mVp-p, BNC connector.
Maximum Data Rate per channel
Sum total ≤ 0.95 x selected output rate with 188 byte signals, or
≤ 0.88 x selected output rate with 204 byte signals.
Equalisation
Automatic, better than 200 metres at 270 Mb/s for Belden 8281 or equivalent cable.

Type 2
RS232 Uni directional data input (maximum 38k4 baud).

Output:
Type
2 x ASI-C 75 Ω, 800 mVp-p, BNC connector, Continuous or Burst (settable).
Payload Rate     Switch Settable
10 Mb/s;
31.672 Mb/s;
34.368 Mb/s (equivalent to E3 rate);
41.227 Mb/s;
44.736 Mb/s (equivalent to Unframed DS3 rate);
44.210Mb/s (equivalent to Framed DS3 rate);
80 Mb/s;
90 Mb/s;
110 Mb/s;
148 Mb/s (suited for STM-1); and
213 Mb/s.

Alarm Outputs:
Major
Open circuit on sum of ASI input payload rates in excess of set ASI output payload rate, or loss of power.
Minor
Open circuit on no valid input ASI streams present, or loss of power.

MMX-4711:
Inputs:
Type
ASI-C 75 Ω, 800 mVp-p, BNC connector.
(Equivalent to MMM-4711 output rate).
Equalisation
Automatic, better than 250 metres at 270 Mb/s for Belden 8281 or equivalent cable.

Outputs:
Type 1
4 x ASI-C 75 Ω, 800 mVp-p, BNC connector.
Data Rate
Same as MMM-4711 input rate.

Type 2
RS232 Uni directional data output.

Alarm Outputs:
Major
Open circuit on no valid ASI input present, or loss of power.
Minor
Open circuit on no valid output ASI streams present, or loss of power.

Power Requirements:
Voltage
28 Vac CT (14-0-14) or 16 Vdc.
Power consumption
MMM-4711 < 5VA, MMX-4711 < 4VA.

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.