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142572 2009 年 09 月 08 日 09:27 Reading (loading. ..) Comments (0) Category: IT data
packet switching technology is the development of computer technology to a certain extent,
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多个表现器举行计划事情的利益和倒霉 - Qzone日志, came into being as a switching technology.
in the packet switching mode, as can a temporary grouping of data exchange, the switch treatment,
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* line of high efficiency: packet switching in the form of virtual circuit channel multiplexing,
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* High reliability of information transmission: the network for transmission of each packet, in the node switches between the use of error checking and retransmission functions,
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* packet multiplex communication: Since each packet contains a control information, so the packet-based terminal can simultaneously communicate with multiple user terminals can be sent to the same information to different users.
* billing and transmission distance has nothing to do: long-time network accounting, billing information, has nothing to do with the transmission distance,
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general packet switching by the packet switch network, network management center, remote concentrators,
Broader market of 1204 - Qzone log, packet assembly and disassembly equipment, packet terminal / non-packet terminals and transmission lines and other basic equipment components. PBX features:
user network access methods are:
dial-up network: the user using X.28 procedures or X.32 protocols, using a modem via the public telephone network (PSTN) connected to the packet-switched Internet.
line network: Users can rent city telephone line analog line or digital data lines, using X.28 or X.25 procedures. Easy access to the CHINAPAC. CHINAPAC to provide users with two basic business functions:
SVC - means the Provisional between two users logical connections.
PVC - is established between two users a permanent logical connection. Users of a boot, a PVC automatically created.