Eicon Networks C2x Family - Manual (Page 12)

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
If termination is required and your Eiconcard C21 does not have the
built in termination switch, you should have been supplied with a 100
ohm 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 wall jack.