Aastra OpenCom 131 User Guide - Page 57
Connectible Terminals, 3.12.1 Internal/External S0 Ports
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Installation Connectible Terminals 3.12 Connectible Terminals The OpenCom 100 ports already offer a large number of possibilities for connecting terminals. By installing additional interface cards (in an OpenCom 130 / 150) the number of ports can be increased as required. One of the many possible configurations is shown in the following diagram. Hub LAN Sensor 1 S0 1 ext R NTBA Intercom/Relay Intercom/Door opener COM R S0 2 int Actuator Upn Upn 1 + 2 1/2 3/4 a/b a/b 1/2 3/4 Example of port assignment of the OpenCom 130 with terminals 3.12.1 Internal/External S0 Ports All S0 ports can be operated externally, i.e. on an ISDN network termination unit. The S02 port of an OpenCom 130 and an OpenCom 131 can also be connected internally. S0 ports on interface cards (available for an OpenCom 130 and OpenCom 150) can also be switched external/internal. It is not possible to use both assignments simultaneously. Up to eight devices per bus (ISDN telephones, ISDN fax machines, ISDN base stations, ISDN cordless telephones, ISDN adapters for the PC among others) can be connected to the internal S0 ports by twin-pair cables. The power for three of these devices can be supplied by the bus; if more devices are used, they then require their own power supplies. The internal S0 buses enable point-to-multipoint calls as per the DSS1 protocol (Euro-ISDN). 55