Aastra OpenCom X320 User Guide - Page 44
PBX Configuration, Ports, Line termination, Configurator, Connecting to the network NTBA
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Installation Port assignment, termination, cable length NTBA S01 external S02 external Connecting to the network (NTBA) You can connect up to 8 terminals (ISDN telephones, ISDN fax machines, ISDN base stations and ISDN terminals, ISDN cards for PCs etc.) to each internal S0 bus. The power for three of these terminals can be supplied by the bus. Where more devices are used, they will need their own power supply. The length of the fourwire cable of an internal S0 bus must not exceed 130 m. Each internal S0 bus has a capacity of about 3 W. The internal S0 buses enable point-to-multi-point calls using the DSS1 protocol (Euro ISDN). To connect an ISDN telephone, connect a pressure terminal connection to an IAE socket. For the following example, activate the PBX Configuration: Ports: S0 (#): Line termination option in the Configurator. In the IAE socket, 100 ohms terminating resistors between 1a and 1b as well as between 2a and 2b are required. 2a 2b 1a 1b Port S0 intern 1a 1b 2a 2b ISDN terminal Socket with 100 ohm termination impedance cable: max. 500 m Connecting an IAE socket 42