Aastra OpenCom X320 User Guide - Page 45
IAE = ISDN wall socket German ISDN „Anschluss Einheit
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Installation Port assignment, termination, cable length Several IAE sockets can be series connected using a bus installation. For the following example, activate the PBX Configuration: Ports: S0(#): Line termination option in the Configurator. In the last IAE socket, 100 ohms terminating resistors between 1a and 1b as well as between 2a and 2b are required. 2a 2b 1a 1b 1a 1b 2a 2b 1a 1b 2a 2b 1a 1b 2a 2b 1a 1b 2a 2b 1a 1b 2a 2b 1a 1b 2a 2b cable: max. 130 m Connecting several IAE sockets Line termination: Enabled 100 ohm termination impedance in the last socket IAE IAE IAE IAE = ISDN wall socket (German ISDN „Anschluss Einheit") If the S0 bus is coming from the OpenCom X320 leading to one or more IAE sockets, the terminating resistors ("TR") in the OpenCom X320 and in the most distant IAE socket needs to be switched on. 43