The video conference provides us with images, sounds, bidirectional remote data
of the best method.
A positioning, to be exact
Each unit in the video conference system construction before the decision
to carefully consider it USES. According to different values to choose proper
transmission quality. Generally speaking, video conference service quality can
be divided into three levels: high quality: circuit based on DDN, E1 line,
conforms to the international telecommunications union (ITU) of h. 320 network
protocol standards, channel rate should be, equipment is 2M Codec hardware
(Codec), 30fpsFCIF video format, with rich interface circuit and intelligence
pronunciation functions.
Applicable state organs, government departments and the construction of
large-scale backbone telecom operators and video television system. Secondary
circuit is usually based on quality, dedicated IP networks, accord with (ITU)
h.323 network protocol standards, channel in 768k above, should rate is full of
hardware equipment 30fpsFCIF Codec, 20 ~ light transmission, video format is the
leading global technology hardware YK optical transceiver. Applicable scope of
office conference or remote teaching. Low quality: provide pure software
10fpsFCIF format video Codec, based on IP circuit. With (ITU) h.323 desktop
video conference requirement, channel in the following. 384k rate Satisfy
requirement of general and simple.
The video conferencing system of guangzhou court, the Supreme Court for
center covers the 3 intermediate court and 18 district or county court and the
people's court, 54 is mainly used for the meeting held in court and transmission
of high quality TV judges images. Choose which network transmission mode
according to the different values to decide, video conference network
construction in guangzhou court of first consideration is clear and cut in the
stability of the image. Therefore, we chose h. 320 agreement and high quality E1
line transmission scheme.
Second, the circuit is the guarantee
In 2001, the video conference system for construction, the local service
to the court for laying cable circuits, renting 2M transmission circuit adopts
PDH transmission, between telecommunication bureau and the use of SDH way, will
eventually all Internet connection to the main circuit court 155M optical
transceiver, network structure for the star. Whole circuit in optical
transmission, video conference system laid a confidential, reliable, safe
operation of the video conference alone, to ensure transmission bandwidth 2M
stability, interface circuit choose E1 manner to avoid because g. 703-35
conversion n loss risk, and fault equipment by the main Codec - MCU - optical
transceiver - light modems - very simple Codec venue between circuits. Follow
the international telecommunications union network protocol (ITU) of h. 320
agreement standard, make the image information and other network information
transmission, and avoid the strictly separate h.323 protocol data exist mutual
interference, guarantee the stable image signal of transmission.
Third, the equipment is the key
"The desire to do a good job, to" build a stable and reliable network
video conference, not only has good data transmission channel, also must have
excellent performance of video conference facilities. We through the actual test
and relapsing, choose the 24 tirol's video equipment Co., LTD. (VTEL) of the
fourth generation of video Codec galactic series 755 conference terminals. The
equipment adopts based on open PC interface and modular design, support h. 320
and h.323 double agreement pattern, simple operation, easy to upgrade, has
powerful multimedia and data transmission function, Can not influence the
quality of image transmission cases for data transmission shuangliu function, In
VTEL unique management software in LAN, under the support of administrators in
the center can monitor console operation cut in, But in the remote diagnostic
system fault detection and can start equipment, the parameters of configuration
remotely operated equipment, realize the administrator of equipment operation
and management of intelligence. In practice, we use the management function, to
ensure smooth cut in meeting a prominent role.
Four, the stability is required
Video conference of image multi-point network controller (MCU) is the key
equipment in the network, the main functions: the establishment meeting, and
node chooses real-time control, resource allocation, data forwarding, agreement
analytical, etc. Whether the performance is stable and reliable MCU equipment
will directly affect the quality of video conference.
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