Appendix

A3: ISDN S0 Interface Pin Assignment

ISDN S0 interface pin assignment (RJ45 plug/jack) (CCITT I.430/ISO 8877)

PinSignal

1Not used

2Not used

3STA (Sending A)

4SRA (Receiving A)

5SRB (Receiving B)

6STB (Sending B)

7Not used

8Not used

A4: Terminal Resistor for ISDN S0 Interface

The last jack on your ISDN S0 bus must be terminated with two 100 ohm terminal resistors.

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Siemens I-SURF manual A3 Isdn S0 Interface Pin Assignment, A4 Terminal Resistor for Isdn S0 Interface, PinSignal

I-SURF specifications

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