h3h5_in_the_lan.fm
A31003-H3590-S100-7-7620, 06/2012
HiPath 3000/5000 V9, Service documentation
13-13
Nur für den internen Gebrauch HiPath 3000/5000 in the LAN Network
HG 1500 Board
● Quality of Service (QoS) monitoring,
● transferring of information about session participants,
● regular distribution of control packets containing quality information to all session partici-
pants.
TCP
TCP (Transmission Control Protocol) provides a connection-oriented mode for data transmis-
sion. TCP guarantees a sequenced, error-free, flow-controlled transmission of data packets.
However, this can delay data transfer and reduce throughput. H.323 uses the end-to-end ser-
vices of TCP for the H.245 control channel, data channels and the call control channel.
UDP
The UDP (User Datagram Protocol) provides a connectionless transmission mode that prom-
ises nothing more than a “best effort” delivery. Only a minimum of control information is trans-
ferred with UDP. H.323 uses UDP for audio, video and the RAS channel (see RFC 768).
Control Control ControlData Audio Video
A/V
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