When using a BRI ISDN card in NT mode (Network Termination), a crossed cable must be used. This cable also needs (depending on the cards port) 100Ohm resistor termination.
3/4 and 5/6 are the crossed lines. For the termination, you need to place a 100 Ohm resistor * between 3 and 6 and one * between 4 and 5 on both sides. (It seems to work with termination on one side only too when the cable is short) |
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