Interfaces and Connectible Terminals S
0
Ports
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 ).
OpenCom 510
TR TR
IAE IAE
MX+S01-8: Terminating resistors deactivated
Both ends of the S
0
bus are terminated by terminating resistors; the terminating resistors must be deactivated (DIP switches set to “1 2”).
5.2.2 External ISDN Ports (S
0
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 S
0
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 149).
PBX 1, S
0
ext
1 2 3 4 5 6 7 8
8 7 6 5 4 3 2 1
PBX 2, S
0
ext
(RJ-45 socket)
Wiring for direct connection
44
