HUT Comms.
Lab, Timo O. Korhonen
28
Symmetry
nCathegories:
nSymmetrical channel as in fixed line telephony
nAsymmetrical channel
nMost technical Internet realizations (As
xDSL-techniques or data over DVB)
are based on idea that downlink traffic is order of magnitude larger that uplink traffic
nPoint-to-multipoint channel
nTV and Fax are point-to-multipoint
distributive services
nNote, however that some new services in
Internet (where your PC works as a
server, as Napster) might require symmetrical traffic channel
nAlso Internet is used for point-to-multipoint
services as in Webcasting (as
in Web-broadcasting or in the PointCast news service.)
nTherefore
developing Internet services set stringent requirements for network
planning!