As video conferencing system applied to its popularity, users of function
requirement will be more comprehensive, more deeply. In providing basic
functions, and on the basis of video conferencing system should also meet the
growing user needs, such as the increasing number of interactive video object,
improve quality and safety of secrecy. This video conferencing system is
required to achieve environmental conditions (of) further perfecting the
requirements. In a more perfect technical conditions, video conferences can
provide more excellent audio-visual interactive services, video conferencing
system applied to promote the further promotion.
Current video conferencing system application environment bottleneck
mainly have the following:
1, the quality of service (QOS) network, video conference system, the lack
of protection of the real-time interactive networks was proposed, including the
basic requirements of the QOS bandwidth and packet loss rate, delay (delay
jitter) and etc. Without these quantitative index of security, we QOS of
real-time video communication will appear obstacle: connect lose, images,
sounds, and cannot discern between interrupt signal obviously lag, the picture
judder phenomenon. Video conferencing system development today, its bottom
supporting network is mainly the IP network, this is the development trend of
the communication network. However, the traditional IP network and did not
provide QOS guarantee. It was originally designed for the simple data
communication, is open and sharing, it is best. "" In the network environment,
this provides plenty of real-time multimedia communication services, there must
be some additional measures.
There has been some more mature solution. RSVP (resources reserve
agreement) working in the IP protocol. The basic idea is to end-to-end resources
through the appointment to achieve quality assurance end-to-end services. Your
RTP/PTCP (real-time transmission protocols/real-time transmission control
protocol (TCP/IP network) is one of the measures of the real-time transmission,
your RTP is running on UDP protocol of data packets, packaging, With your RTP
RTCP control protocol data protocol used for data transmission, it provides
quality feedback information, so as to take corresponding strategies and
application system. Diff - forget (service) defines a IP QOS: on IP layers of
data classification and identification, based on different types of data gives
different treatment strategies, on different levels of QOS guarantees. To
fundamentally solve the network, network communication QOS also launched a lot
of research in the next generation, prepare the IP network (IPv6) fully
guarantee the quality of network services. This video conferencing system will
have a more perfect network environment.
2, the bandwidth, access telecommunication network video conferencing
system of bandwidth resources in access in bottleneck. Main transmission network
bandwidth are generally Gb/s, Tb/s, quite rich, while the user access terminal
relatively appears more nervous. At present, the main means access network users
have dial-up Internet, digital subscriber line (xDSL access), optical fiber or
HFC (hybrid coaxial cable and wireless access) access. Optical fiber or HFC
network access data transfer rate is higher (10 MB/s), but the price is higher,
the application is not very wide, Popular is (ADSL, such as xDSL 128-768kb/s
behavior, the next act 2 ~ 8Mb/s), Dial-up gradually faded out of the market,
the ability after 56Kb/s (within). Video conferencing system to see the
bandwidth needs. The data and voice signal neglected to 6Kb/s (reference itu-t
g. 723 standard), all the way to 64Kb/s image signal (reference to mpeg-4
standard video conferencing system), the terminal 80Kb need about/s, N * uplink
bandwidths 80Kb/s downline bandwidth, N to participate in exchange of users.
According to this view, ADSL video conferencing system can support the
application of interactive user participation, but the quantity is limited in
the individual. Video conferencing system to let people daily work and life of
tools, there should be no such restrictions. Say so, optical access is
inevitable trend of access technology.
3, network video conference system, access barriers to transmission of
voice, video and data and control information, need to use a large number of
network resources, to establish connections, get real IP address, use multiple
ports, and the actual network firewall, proxy server, the router facilities for
the operation of the network resources with limited. As a result, the sound and
video communication may simply set up. Namely, the network management of
equipment configuration strategy directly influences the video conference system
application scope. The ideal situation is, video conferencing system can be like
the WWW service for all the people, the license for network resources is the
default, it needs to be open to the video conferencing system of social
applications reached broad consensus.
Related Product:
กก
|
|
