Method of and circuit arrangement for synchronizing a digital data transmission arrangement with a network-external clock

Abstract From the Canadian patent

If in an integrated services digital network ISDN a digital synchronous network, for example an integrated text and data network, has to be combined with an analog network, for example the telephone network then synchro-, nization is required between the two networks or between the digital data transmission arrangements provided in the different networks. In order to establish synchronisation of a digital data transmission arrangement which, is provided within the digital network and is in synchronism with the central clock thereof, with a networkexternal clock a comparator is provided at the interface the digital and the analog networks. During a clock period of the central clock of the …