ISDN-Pin Assignment and technical Information

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8 7 6 5 4 3 2 1   Screwing terminal
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8 7 6 5 4 3 2 1   Screwing terminal for the left socket
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8 7 6 5 4 3 2 1   Screwing terminal for the right socket

ISDN Installation

For the ISDN installation it is important that the wires are not swapped or interchanged. The S0 bis has to be passed without interruption, line swapping or interchanging from one socket to the next one. This meaqns that line a2 is connected to contact 3 of the first socket and also connected to contact 3 of the nect socket etc. with all lines. The number of sockets is not limited. The total length of the S0 bus shoud not be longer that 130 meters. In the last socket the wire have to be terminated with 100 to 120 ohms resistors. At each socket any ISDN unit can be connected. These can be ISDN-Telephones, PC cards or terminal adapters for analog telephones. At the NTBA are 2 sockets of the same S0 bus. If you only want to connect 2 ISDN units, e.g. a terminal adapter and a PC card you can plug them directly into the NTBA and does not need to terminate the bus. However the cable lengths are resticted to 3 meters per unit in this case.

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DSL Informations

DSL stands for "Digital Subscriber Line". The transmission rate for this new technology is up to 768 kbit/s and thus approximately the 10-fold if the ISDN connection. By this the download times for software and MP3 (music) files come into a good range. There is no need for changes at the telephone lines. Only two additional units are necessary: a DSL splitter and a DSL modem. You also meed an ethernet card for the PC. The DSL splitter filters the signals from the usual telephone and ISDN signals. The DSL modem performs the adaptation to the internet. The connnection from the PC to the DSL modem is done via the ethernet card. The following schematic drawing shows the DSL installation:

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Hints for the installation and configuration of the software can be found at the following pages:
http://www.gschwarz.de/t-dsl.htm