Parannettu kaksisuuntainen tietoliikenneyhteys kaapelitelevisiojärjest elmässä

摘要

In a digital cable television system or an HFC system at least two control channels (104) of the out-of-band type are arranged to control the same upstream data transmission channel (107), whereby their capacity can be combined in order realise downstream data transmission in parallel with downstream high capacity data transmission. Applied in the DAVIC system the overhead bits (110a, 110b) of the SL-ESF frames (108a, 108b) of the co-ordinated control channels, and the R-bytes (R1a to R8c) of the SL-ESF payload indicating to which channel the control is directed, are made identical.