Specifications subject to change without prior notice
Typical values shown unless min or max is specified
100-DS0242X1 03/09/09 2 of 7
www.cobham.com/gms
Messenger Rackmount Decoder
HD/SD MPEG-2 4:2:0 Decoder MRD-420
MPEG Transport Stream Tuning
The decoder can be set to tune both video and audio by three ways: Auto, PID locking, Priority.
In Auto mode the unit will self acquire the first MPEG program in the transport stream and the first audio PID listed
in the PMT for that Program. For multiple program streams (MPTS), the program number can be selected. Within
the selected MPEG program, each of the two audio processors can have an audio PID from that program selected.
In PID locking mode the MRD 420 can be set to select video (and PCR) from a specific PID, and select audio for
the 1st and 2nd audio processor from specific setting. This setting can be set manually using numeric PID values.
In this mode the MRD 420 will only decode video or audio that has been manually set.
In Priority mode two different MPEG program and Audio PID index scenarios (priorities) can be set.
Unit Status
The MRD 420 has two LED status lights. One LED is for Input, which is green when
the selected input is OK (present and valid for transport stream interfaces, and meets
settable criteria). The second LED lights when Error conditions occur.
Serial Transport Stream I/O (SMPTE 310/DVB-ASI)
The Serial Transport Stream I/O card has one input jack and one output jack. The user must select whether the
card is to be used in the 310M mode or the ASI mode. For ASI the bitrate for the transport stream must be
between 1.5 Mb/s and 60 Mb/s. For SMPTE 310M the bitrate for the transport stream must be 19.392658 Mbps.
The input mode setting also affects the output mode.
Video Output (2-HDSDI, 1-Component [Y,Pb,Pr /RGB])
The video output card provides two isolated but mirrored HD-SDI, SMPTE 292M compatible serial digital video
outputs and one analog Y,Pb,Pr or RGBHV Component output. One high density DB-15 female plug serves for both
the Y,Pb,Pr or RGBHV outputs. Selections in the Front Panel menu or the Remote Client determine the available
output.
Audio from two processors on a Decoder Board can be embedded into the HD-SDI serial digital signal in the
Horizontal Ancillary Space (HANC). Two types of processed audio can be embedded, raw compressed digital and
two-channel decoded PCM linear encoded AES/EBU. Closed Caption data NTSC (608B) and DTVCC (708B) can be
embedded into the Vertical Ancillary Space (VANC) of the Luma portion starting at line 12.
Audio Output
The audio output card provides both digital and analog audio outputs, each from two audio processors at the same
time. There are two digital audio output jacks; one for each audio processor. The audio processor for each jack can
be individually set to any audio PID in the audio decoder setup section. Each digital audio output can be set to
RAW or PCM. In RAW the compressed audio for the selected PID is passed through to the digital output. Typically
this setting (raw) is used to pass through the Dolby AC-3 compressed digital signal. When the digital audio output
is set to PCM, two-channel PCM linear coded AES/EBU audio is output to the digital audio jack for each audio
processor (1 or 2) decoded from the selected audio PID. There is a DB-15 high density male connector which
provides balanced analog outputs for each audio processor. The audio processor is self sensing of the type of
compressed audio in the transport stream.
(12 pages)
(80 pages)
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Comments to this Manuals