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Termination 11
Termination
This section applies to S/T interface users in Australia and North
America, and provides instructions to help 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.
For users who require termination, the Eiconcard C21 S/T has been
shipped with a separate terminating resistor. For information on how
to install the terminating resistor, see “Installing a Terminating
Resistor” on page 12.
How do I determine the termination value?
Single ISDN Device
If the NT1 is connected to a single ISDN device (e.g.
Eiconcard C21), follow the instructions below.
75 meters or more
If the connection spans 75 meters (250 feet) or more, connect the
100 ohm terminating resistor included with the ISDN cable. Set the
NT1 to provide 100 ohms of resistance. Consult the manual
provided with the external NT1 for more detailed instructions.
Note Some NT1s do not support connections over 75 meters (250
feet). Check your user documentation to determine the distance
supported.
75 meters or less
If the connection spans less than 75 meters (250 feet), set the NT1
to 50 ohms of resistance, and do not connect the terminating
resistor. Consult the manual provided with the external NT1 for more
detailed instructions.