3465&3485-mfc.ib.rev4.doc
page 3 of 22
17/10/2007
General description
The MFC-3485 and MFC-3465 are part of a family of data transcoders for converting between the commonly used
MPEG2 Transport Stream formats in the broadcast industry for video distribution.
Any ASI (Asynchronous Serial Interface) input with a payload data rate within the range of 1.5 to 39 Mb/s will be
converted to a B3ZS encoded 44.736
Mb/s unformatted data stream by the MFC-3485/45. The output shape may be
either “High” or “Low”.
The MFC-3465/45 provides the complementary conversion from a data payload within a 45 Mb/s B3ZS G.703
stream to ASI format.
For HDB3 34.368 Mb/s rates the MFC-3485/34 and MFC-3465/34 may be used. These accommodate data payloads
in the range of 1.5 to 30 Mb/s.
The transmitted streams are padded up to the required transmission rate with bytes of a unique pattern, which are
removed at the receiver so that the original ASI payload rate is restored.
In the absence of a valid MPEG ASI input the MFC-3485 will transmit “all ones”.
IRT’s 34XX series of adapters provide a modular approach to connecting between the different transport types.
The 34XX series find particular application in CATV Headends where equipment from different manufacturers uses
different formats. They may also be used for monitoring connections to test equipment.
In addition, the DDC-3470 provides facilities for changing certain coding features of the MPEG transport stream to
ensure compatibility between signals.
Note: The DDC-3471 allows Reed Solomon correction and the insertion or removal of interleaving and MPEG2
transport stream spectrum shaping randomisation. This makes it an ideal adjunct to test equipment or for matching
signal from various sources using different encoding options.
Product
Data rates
Input
DDC-3460
/34
G.703-E3
ASI
/45
G.703-DS-3
ASI
DDC-3471
SPI
SPI
ASI
DDC-3480
/34
ASI
G.703-E3
/45
ASI
G.703-DS-3
DDC-3330
1.5 to 50 Mb/s
ASI
SPI
DDC-3340
1.5 to 50 Mb/s
SPI
ASI
MFC-3465
/34
G.703-E3
ASI
/45
G.703-DS-3
ASI
MFC-3485
/34
ASI 1.5 to 30 Mb/s
G.703-E3
/45
ASI 1.5 to 39 Mb/s
G.703-DS-3
Outputs
Product Selection Chart
