A METHOD TO PROVIDE INFORMATION CONCERNING A FREQUENCY BAND, A HEAD-END, A NETWORK TERMINATOR AND A TERMINAL REALIZING SUCH A METHOD AND A COMMUNICATION ACCESS NETWORK INCLUDING SUCH A HEAD-END, SUCH A NETWORK TERMINATOR AND SUCH A TERMINAL

摘要

A method to provide information in a communication access networkwhich includes a plurality of terminals (T12, T12, T13, ..., T31, ...) and ahead-end (HE): The head-end (HE) includes transceivers (TRX1, TRX2, TRX3, ...) and isdownstream coupled to each one of the terminals via a downstream commonlink (Lc) and a tree-like distributive network. Each transceiver provides to acombiner (COMB) included in the head-end (HE) a downstream signal (Sd1,Sd2, Sd3, ...) in a frequency band (CH1, CH2, CH3, ...) associated to thetransceivers (TRX1, TRX2, TRX3, ...). The downstream signals (Sd1, Sd2, Sd3, ...)are together combined into a downstream modulated signal (S-MOD) which isbroadcasted from the head-end (HE) to the terminals. A first one (T12) of theterminals is upstream coupled to a first transceiver (TRX1) via an upstream link.The information is provided to the first terminal and concerns a filter frequencyband (CH1) which is a first one of the frequency bands which has to be used bythe first terminal to filter out of the downstream modulated signal a regenerateddownstream signal associated to a first one (Sd1) of the downstream signalsprovided by the first transceiver (TRX1). The method inserts a pilot tone signal(P1i, P1j, P1k) in the downstream modulated signal within a predefined pilot tonefrequency band (CHp1i). The pilot tone signal (P1i, P1j, P1k) includes theinformation concerning the first frequency band and the method filters out of thedownstream modulated signal by the terminal with a derived frequency band(CHd1i, CHd1j, CHd1k) which is derived of the predefined pilot tone frequencyband (CHp1i, CHp1j, CHp1k) the pilot tone signal (P1i, P1j, P1k).