THE INTERFACE BOARD FOR PROVIDING WIDE BAND SERVICE TO CABLE NETWORK IN MULTI-FUNCTIONAL GROUP SUBSCRIBER DEVICE

摘要

Purpose: an interface board of broadband services is provided for a cable television network for the subscriber unit from a multi-functional collective, as can be engaged with set-top box, old analog phone, fax, modem etc., be arranged to many subscribers provide service, no matter network environment. Construction: the parts a RF are made of separator (9), a hop (10), a receiving portion (11), a local oscillator (12) and a base band splitter/combiner (13) for call/CATV separators (8), a transmitting-receiving. Call/CATV separators (8) split broadcast, and audio service is transmitted from a head end. The radio-broadcasting service split is sent to cable broadcasting subscriber, and the audio service split to transmitting-receiving separator (9). The separator (9) of transmitting-receiving provides between head end and an association subscriber and transmits/receives separate communication path. Hop (10) is by a power amplifier, a upconverter and gain control unit composition. Receiving portion (11) is made of a low-noise amplifier, a bandpass filter, a down-converter and a gain control unit. Local oscillator (12) is connected to the upconverter of hop (10) and the down-converter of receiving portion (11), is a frequency generator of the up-conversion for being used for transmission part (10) and the down coversion of receiving portion (11). Signal with each different frequency band is entered baseband signals and transmits the signal of conversion to corresponding modem by base band splitter/combiner (13). Base band splitter/combiner (13) makes from various modem splitting transmissions into multiple baseband signals of different frequency bands and transmits them to hop (10).