DBE 4120
MPEG-2 Encoder System for Contribution
Configuration
guide
Issued by Network Products Marketing Department
GDBD4120 - 09/1999
THOMSON broadcast systems - All rights reserved
p.2 of 12
Product overview
DBE 4120 features advanced MPEG-2
compression to provide the best
quality video encoding and
architecture flexibility for matching
the variety of I/O interfacing with
video sources and contribution
networks
Key features
:
Ä
4:2:2 and 4:2:0 high performance
compression
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Maximum interfacing flexibility
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Helper Channel capability
Ä
Extensive audio handling
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Low and ultra-low delay modes
capability
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VBI lines transport
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Scrambling capability
The DBE 4120 is a single service encoder, which performs the compression of video and audio
sources. The provision of extensive hardware and software options allows customising and
upgrading the system in order to match with customer requirements.
The video source is a SDI signal for the standard model but a composite video (PAL, SECAM or
NTSC) source can also be provided as an option. Video compression is achieved either in
MPEG-2 4:2:0 MP@ML or 4:2:2P@ML standard.
A TS input option allows daisy chaining of several encoders in order to multiplex related services
within the same output transport stream. Two audio channels, which can be de-embedded from
the SDI stream or received through separate analogue or AES/EBU audio sources, are
processed. Audio compression is performed according to the ISO/IEC 11172-3 layer 2 standard.
On option, up to eight additional stereo audio can be multiplexed with the SDI primary signals, as
well as data.
The DBE 4120 has been designed as a 2 RU height, 19" sub-rack, easy to install and operate. A
range of network interfacing options is proposed for PDH or SDH network interconnection with
ATM mapping. Thanks to its user-driven menu, it can be easily controlled and monitored locally
from the front panel keypad, or remotely through an Ethernet link with the DBS 2930
management software or with an SNMP agent in an NMS environment.
DBE 4120 Functional Block Diagram
MPEG2
Video
Encoding
VBI
Processing
Audio
Encoding
RS 232 Data
Interface
Data
Mu
ltiplexing
Scrambling
PAL,
SECAM,
or NTSC
SDI
2 stereo or 4 mono
analogue audio
Ethernet
Data
Options
TS ASI
Control
Alarms
LCD/Keypad
Composite
video
AES
Input
2 AES/EBU
audio
4:2:0 &
4:2:2
ASI
Interface
ATM Network
Interface
PDH
or
SDH
Audio
Encoding
4 AES/EBU audio
Audio
Encoding
4 AES/EBU audio
Modulator
IF
