Specifications

3000sb4.fm

P31003-H3560-X100-1-7618, 09/05

HiPath 3000/5000 V6.0, System Description

4-17

For internal use only

HiPath 3000/5000 in the LAN Network

HG 1500 V3.0

RTCP (Real-time Control Protocol) is used for controlling RTP. It enables:

● 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).

trol Data A dio Video

Ctl Ctl

A/V

Control Data Audio Video

Control Control

TCP UDP

RTP

G.7xx

H.26x

RTCP RAS

T.120H.245H.225.0

(Q.931)

A/V