By Dr. rer. nat. Peter Bocker (auth.)
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Additional info for ISDN The Integrated Services Digital Network: Concepts, Methods, Systems
A further communication service intended primarily for private use is telewriting. Short messages are written with an electronic pen on a note pad and sent to the receiver directly or stored in his electronic mailbox. The messages may be reproduced on the domestic television screen by vector graphics using an accessory unit or on other terminals with video screens in the horne or office of the addressee. This service could be introduced to supplement telephone communication (using integrated voice and telewriting terminals).
The effect of transmission rate on the holding time is much greater for calls which do not depend on subscriber response times but in which it is only the quantity of information and the transmission rate which determiile the mean holding time. This applies, for example, to calls for text, data and facsimile transmission. 2). Less pronounced are the effects of service integration on the total trafiic in the network. Due to their mainly short holding times, text and data calls generate little trafiic compared with voice trafiic for the same frequency of calls.
9). e. all subscribers connected to their respective subordinate exchanges. 5 Operation and Maintenance in the ISDN The operation and maintenance functions for the ISDN network components are largely subject to the same requirements as those affecting the digital telephone 38 3 ISDN Structure network, particularly where the exchanges and the trunk network are concerned. The main functions are detailed in Sect. 7. Additional requirements basically concern the subscriber line network, as the analog subscriber access is now replaced by a digital one.