DVB
/ MPEG2 (ASI) PRODUCTS
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DVB / MPEG2 (ASI)
PRODUCTS
Interface Adapters
DDC-3330
SPI Network Interface
Adapter
DDC-3335
ASI to
ASI/SPI Network Interface Adapter with RS Encoding
DDC-3471
SPI to
ASI/SPI Network Interface Adapter
MDT-3670
ASI to G.703/ASI Network
Interface Adapter
MDR-3670
G.703
to ASI Network Interface Adapter
MMM-4230/MMX-4230
4 ASI to G.703 (DS3)
Multiplexer/Demultiplexer
MMM-4681/MMX-4681
4 ASI to G.703 (STM-1)
Combiner/DeCombiner
MMM-4711/MMX-4711
4 ASI to ASI
Combiner/DeCombiner
DDC-3330 &
DDC-3340 ASI / SPI Network Interface Adapters DDC-3330
DDC-3330 Limited
Stock
DDC-3340 obsolete Stock - no longer Available
Features
-
Rate independent from 1.5 Mb/s to 50
Mb/s.
- Modular format
compatible with IRT fibre optic, distribution amplifier and switcher
modules.
Applications:
-
ASI
conversion for transport via coaxial
cable or fibre optic links to distant
sites.
-
Interfacing various MPEG2 TS formats.
-
Block
length indication and error detection.
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Connections to modulators or test
equipment.
-
Signal
monitoring for remote alarm indications
General
The DDC-3330
and DDC-3340 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 SPI input data rate within the range of
1.5 to 50 Mb/s will be converted to the
corresponding rate within a 270 Mb/s ASI
stream by the DDC-3340. The DDC-3330
provides the complementary conversion from
ASI to SPI format.
The SPI (Synchronous Parallel Interface
MPEG2) format is convenient for data
manipulation, but is not suited to
transporting signals over more than a few
metres.
The ASI
(Asynchronous Serial Interface 270 Mb/s)
format can easily carry data over several
hundred metres on coaxial cable or many
kilometres on fibre optic cable.
The DDC-3330 & 3340 do not perform any
signal correction or alter the format of the
MPEG2 transport stream. They only change the
transport stream electrical format and
monitor the signal for MPEG2 transport
stream sync errors.
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DDC-3335 Limited Stock
ASI / SPI Network Interface
Adapter with RS Encoding
Features
-
Standard 75 Ω ASI-C input
-
188 to 204 byte packet
conversion
-
Rate independent from 1.5
Mb/s to 50 Mb/s
-
Automatic Reed Solomon
encoding
-
Interleaving and Energy
Dispersal (Scrambling)
-
Two ASI outputs plus
serial to parallel conversion for output as SPI
-
Automatic input equaliser
to >250 m
-
IRT Eurocard format
Applications:
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-
ASI
conversion for transport via Telecom links
-
Connection to IRT's QPSK modulator for transport via analogue
microwave links
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Connection to products requiring SPI inputs
General
The DDC-3335 is
part of a family of data transcoders for
converting between the commonly used MPEG2
Transport Stream formats in the broadcast
industry for video distribution.
The DDC-3335 accepts any ASI input data rate
within the range of 1.5 Mb/s to 50 Mb/s.
The DDC-3335 accepts either a 188 or 204 byte
packet format ASI signal. For a 188 byte packet
ASI input, Reed Solomon check bytes are
automatically added to convert the signal to a
204 byte packet signal. For a 204 byte packet
ASI input, existing RS check bytes are
over-written.
Interleaving and Energy Dispersal (Scrambling)
of the signal is also performed. These two
functions may be disabled by the insertion of on
board links.
188 to 204 byte conversion & RS encoding are
also link enabled/disabled. Disabling 188 to 204
byte conversion disables RS insertion and
interleaving automatically.Two ASI and 1 SPI
outputs conforming to the DVB standard are
provided.
The addition of RS encoding and optional
Interleaving and Scrambling make the DDC-3335
suitable for preparing an ASI signal for
transport over Telecom type lines or, in
conjunction with IRT's MDT-3510 QPSK modulator,
microwave links.
The signal is also monitored for MPEG2 transport
stream sync errors and provides front panel LED
indications for input packet byte length, loss
of input and loss of sync. Alarm relay contacts
are also provided on the rear connector for
remote monitoring of alarm status.
The DDC-3335 is fabricated in IRT's standard
Eurocard format and may be housed in a variety
of IRT Eurocard frames alongside other standard
modules.
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DDC-3471
SPI to SPI, ASI Network Interface
Adapter
Limited Stock
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Reed Solomon
insertion & correction.
-
Interleaving
or de-interleaving.
-
Scrambling or
de-scrambling.
-
Block length
indication and error detection.
-
Supplement to
test equipment.
General
The DDC-3471 is
part of a family of data transcoders for
converting between the commonly used MPEG2
Transport Stream formats in the broadcast
industry for video distribution.
The DDC-3471 allows SPI to SPI and SPI to ASI
conversion for any rate in the range of 2 Mb/s
to 60 Mb/s and also allows Reed Solomon
correction and the insertion or removal of
interleaving and MPEG2 transport stream
scrambling. This makes it an ideal adjunct to
test equipment or for matching signal from
various sources using different encoding
options.
The adapters find particular application in CATV/SMATV
Headends where equipment from different
manufacturers uses different interfaces or where
connection to test equipment is required from
various sources.
The DDC-3471
accepts SPI input format only, but provide
simultaneous outputs in SPI format and in ASI-C.
The formats available are:
SPI Synchronous
Parallel Interface MPEG2
ASI Asynchronous
Serial Interface 270 Mb/s Coaxial cable
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MDT-3670 ASI to ASI & G.703 Network Interface Adapter
Features
-
Wide range of ASI to ASI & G.703
conversions
-
E3, DS3 or “Special” DS3 operation
-
Reed Solomon encoding
-
Interleaving
-
Scrambling
-
Packet length indication
-
Selectable 188 to 204 byte conversion
-
Packet stuffing with or without PCR
restamping
General
The MDT-3670 is part of a
family of data transcoders for converting between the commonly used MPEG2
Transport Stream formats in the broadcast industry for video distribution.
The MDT-3670 can operate at ASI rates from 2 Mb/s to 50 Mb/s. The input ASI
stream can be rate adapted (and optionally PCR restamped) to an E3, DS3 or
framed DS3 rate. Front panel switches allow Read Solomon encoding,
Interleaving and Scrambling (energy dispersal). The input signal can be
converted from 188 byte packet size to 204 prior to encoding.
After encoding, two outputs are provided. An ASI output and a G.703 output,
which may be at E3 or DS3 (framed or unframed) rate for interfacing to Telco
type of systems.
There are several industry
modes of encoding that can be encoded by the MDT-3670. They are loosely
classified as follows:
Standard: Full rate [no rate adaption]
Upstream: Rate adapted input (PCR
restamping)
Downstream: Packet stuffed [no PCR
restamping]
Compatible: Legacy framing
This range covers most of the ASI/G.703 transmission methods from both IRT
and most other equipment manufacturers.
The MDT-3670 is fabricated in IRT's standard Eurocard format and may be
housed in a variety of IRT's frames.
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MDR-3670 G.703 to ASI Network
Interface Adapter
FEATURES
-
Wide Range of G.703 to ASI
conversions
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E3 or DS3 operation with
automatic DS3 De-framing
-
Reed Solomon correction
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De-interleaving
-
De-scrambling
-
Packet length indication
-
Distributed or Contiguous Packet
Mode
General
The MDR-3670 is part of a family of data transcoders for converting
between the commonly used MPEG2 Transport Stream formats in the
broadcast industry for video distribution.
The MDR-3670 operates with either an E3 (34.368 Mb/s) or DS3 (44.736
Mb/s) G.703 rates.
There are several industry modes of encoding that can be decoded by
the MDR-3670. They are loosely classified as follows :
Standard: IRT MDT-3570, DDC-3480
Upstream: Similar to above
Downstream: Packet stuffed
Compatible: Legacy framing
This range covers most other manufacturer's equipment.
Front panel switches
allow Reed Solomon correction and/or the removal of interleaving and
scrambling (energy dispersal). On board switches allow 204 to 188
conversion, after decoding, and the output ASI packet structure to
be set to either "Distributed" or "Contiguous" mode.
The MDR-3670 is fabricated in IRT's standard Eurocard format and may
be housed in a variety of IRT's frames.
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MMM-4230 4 ASI to G.703 MUX &
DeMUX
FEATURES
-
Up to 4 ASI and 1 Data stream on
one 45 Mb/s G.703 link
-
Input rate stuffing to 45 Mb/s
G.703 rate
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Selectable input maximum data
rates
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Automatic Input equalisation up
to 300m
-
Suitable for Single Frequency
Network (SFN) use
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Optional SNMP plug-in monitoring
and control module
-
Eurocard format
General
The
MMM-4230 and MMX-4230 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-4230 up to four ASI and one RS422 data signals can be
multiplexed together and converted into an framed or unframed DS3
signal for transmission down a single 45 Mb/s G.703 line.
The MMX-4230 converts and demultiplexes the 45 Mb/s G.703 signal
back into the original four ASI signals (at their original rates)
and the RS422 data signal.
An on board switch on the MMM-4230 sets the maximum data rates for
each ASI input allowing the efficient use of the available bandwidth
and for protection against overuse of the bandwidth by the other
channels. Total maximum data rate up to 43.5 Mb/s is allowed.
Temporary packet stuffing is used to automatically bring the rate up
to 45 Mb/s.
Inputs are automatically equalised for lengths of up to 300m of
Belden 8281 or equivalent cable.
RS422 9600 Baud uni-directional data may also be sent on the
same link.
Front panel indication and relay alarm on the MMM- 4230
transmitter shows if there is an input data rate violation.
Corresponding alarm on the MMX-4230 receiver shows a loss of
G.703 input.
An optional Simple Network Management Protocol (SNMP) plug-in
module is available for remote monitoring of input and output
status, control and alarm states.
The MMM-4230 and MMX-4230 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.
Note: Also available in a 34Mb/s G.703 version.
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MMM-4681 & MMX-4681 4 ASI to G.703
(STM-1) Combiner / DeCombiner
FEATURES
- Up to 4 ASI and 1 Data stream on one
155 Mb/s (STM-1) G.703 electrical or optical1 link.
- Automatic input equalisation up to
250m.
- Suitable for Single Frequency Network
(SFN) use.
- Maintains original ASI rate, packet
size & coding (energy dispersal scrambling, interleaving or Reed
Solomon bytes).
General
The
MMM-4681 and MMX-4681 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-4681 up to four ASI and one RS232 data signal can be
combined together and converted into a 155Mb/s G.703 (STM‑1)
electrical CMI signal, or NRZ standard (NRZ for optically
interfacing to an STM-1 optical fibre network using IRT's
DDT-4210/DDR-4211 fibre link set to match corresponding rate for
transmission),
The
sum of the ASI input payload rates can be anything up to 148 Mb/s.
Inputs may be 188 or 204 byte packet length, burst or continuous,
and may have energy dispersal scrambling, interleaving and/or Reed
Solomon bytes included.
The MMX-4681 separates the 155 Mb/s G.703 signal back into the
original four ASI signals (at their original rates) and the RS232
data signal. The ASI outputs are suitable for Single Frequency
Network use, in that there is no data rate conversion or PCR
restamping of the ASI streams.
Inputs are automatically equalised for
lengths of up to 250m of Belden 8281 or equivalent cable.
RS232 uni-directional data may also be sent on the same link. It can
pass rates up to 19.2 kb/s with any combination of start/stop &
parity bits. The data rate does not affect the payload available for
the ASI streams.
Front panel indication and relay alarm
on the MMM‑4681 transmitter shows if there is an input data rate
violation. Corresponding alarm on the MMX‑4681 receiver shows a loss
of STM-1 input.
Optional SNMP (Simple Network
Management Protocol) version is available for monitoring and control
when used in an IRT frame fitted with SNMP capability.
The MMM-4681 and MMX-4681 are designed
to fit IRT’s standard Eurocard frames and may be used alongside any
other of IRT’s analogue or digital Eurocards.
1 When used in
conjunction with IRT's DDT-4210/DDR-4211 fibre link set to match
corresponding rate.
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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 setup.
- Maintains original ASI rate, packet
size & coding (energy dispersal scrambling, interleaving or Reed
Solomon bytes).
- Suitable for Single Frequency Networks
(SFN).
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 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.
* 0.95 x with 188 bytes,
0.88 x with 204 bytes
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