Appendix A: ISDN Line Termination
This section applies to S/T interface users in Australia and North America. It provides instructions that help you set up termination scenarios. Termination requirements vary according to the number of devices connected to the NT1, and the distance between the devices and the NT1.
Single ISDN Device
If the NT1 is connected to a single ISDN device (e.g. DIVA T/A), follow the appropriate procedure below.
75 meters or more
If the connection spans 75 meters (250 feet) or more, set the DIVA T/A 100 Ω switch to the On position. Set the NT1 to provide 100 Ω of resistance. Consult the manual provided with your NT1 for more detailed instructions.
Note: Some NT1s do not support connections over 75 meters (250 feet). Check your documentation to determine the distance supported.
75 meters or less
If the connection spans less than 75 meters (250 feet), set the DIVA T/A 100 Ω switch to the Off position, and set the NT1 to 50 Ω of resistance. Consult the manual provided with the NT1 for more detailed instructions.
