Termination - Eicon Networks Eiconcard C90 Installation Manual

Termination

This section provides instructions to help set up termination scenarios
for installations in Australia and North America. Termination
requirements vary according to the number of ISDN devices connected
to the NT1 and the distance between the ISDN devices and the NT1.
Terminating resistor
If you purchased the Eiconcard in North America, a 100 ohm
terminating resistor is included. 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 an ISDN jack.
Terminating a single ISDN device
If the NT1 is connected to a single Eiconcard, then:
• If the connection spans 75 meters (250 feet) or more, set the
NT1 to provide 100 ohms of resistance and connect the terminating
resistor. Consult the manual provided with the NT1 for more
detailed instructions.
Note: Some NT1s do not support connections over 75 meters.
• 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 NT1 for more
detailed instructions.
Terminating multiple ISDN devices
If the NT1 is connected to more than one Eiconcard or other ISDN
device, then follow the instructions below.
• If the connection spans 75 meters (250 feet) or more, then the
ISDN device at each end of the connection must be set to 100 ohm
termination. If the Eiconcard is at one end of the connection,
connect the 100 ohm terminating resistor to the end of the ISDN
cable. Consult the manuals provided with the other ISDN devices
and NT1 for detailed instructions.
Note: Some NT1s do not support connections over 75 meters.
• 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.
Making an ISDN connection 9