Aastra OpenCom 510 User Guide - Page 44
Bus Configuration: OpenCom 510 at the End of an S
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Interfaces and Connectible Terminals S0 Ports Bus Configuration: OpenCom 510 at the End of an S0 Bus If a OpenCom 510 is connected at the end of an S0 bus, the terminating resistors of the relevant S0 interface cards must be activated. In a typical configuration, the OpenCom 510 will be connected to the network termination for basic access (NTBA) with an externally switched S0 port; therefore, all terminating resistors of the interface card are activated in the default setting. ON 12 OpenCom 510 TR IAE IAE MX+S01-8: Terminating resistors activated One end of the S0 bus is terminated by the OpenCom 510; the terminating resistors must be activated (DIP switches set to "on"). IAE = ISDN socket (German: "ISDN Anschluß Einheit") or ISDN terminal. TR = Terminating Resistor, the S0 termination. The TR must be at the termination of the line. This can also be done by an appropriately wired IAE. 1a TR 1b 2a TR 2b Termination on an ISDN socket The illustration Termination on an ISDN socket shows an IAE with integrated terminating resistors. Bus Configuration: OpenCom 510 in the Middle of an S0 Bus If a OpenCom 510 is connected in the middle of an S0 bus, the terminating resistors of the relevant S0 interface cards must be deactivated. 42