Specifications

12 Termination
Multiple ISDN Devices
If the NT1 is connected to more than one ISDN device, follow the
procedures below.
75 meters or more
If the connection spans 75 meters (250 feet) or more, both end
devices on the ISDN bus must be set to 100 ohm termination. If the
Eiconcard is one of the end devices, connect the 100 ohm
terminating resistor included with the ISDN cable. Consult the
manuals provided with the other ISDN devices and NT1 for more
details.
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. Set the other ISDN devices to no termination. Consult the
manuals provided with the NT1 and other ISDN devices for more
detailed instructions.
Installing a Terminating Resistor
The terminating resistor is installed by inserting the RJ-45 end of
the ISDN cable into the terminating resistor, and then inserting the
terminating resistor into the ISDN S/T cable (see, “Connecting the
ISDN S/T Cable” on page 10.