Aastra OpenCom 510 User Guide - Page 45
External ISDN Ports (S0 External), Installing Interface, Cards
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Interfaces and Connectible Terminals S0 Ports 1. Remove the interface card by following the instructions in Installing Interface Cards starting on page 31. 2. The DIP switches are protected by a plastic foil. Use a pointed tool such as a screwdriver to slide the DIP switches down (see arrow in the illustration MX+S01-8: Terminating resistors deactivated). ON 12 OpenCom 510 TR IAE TR IAE MX+S01-8: Terminating resistors deactivated Both ends of the S0 bus are terminated by terminating resistors; the terminating resistors must be deactivated (DIP switches set to "1 2"). 5.2.2 External ISDN Ports (S0 External) You can connect the OpenCom 510 to the NTBA or to a second OpenCom 510 for PBX cascading. To connect the OpenCom 510 to the NTBA, wire pins 3, 4, 5, 6 of the NTBA and of the OpenCom 510 1:1. To directly connect two OpenCom 510 systems via the external S0 ports, connect the RJ45 sockets of the systems by means of a crossed twisted-pair cable. The distance between the two PBXs must not exceed 1000 metres (see also PBX Networking starting on page 151). 43