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The table uses metric measurements. The equivalent imperial
Note:
measures are: 75 m (250 ft), 150 m (500 ft), 900 m (3000 ft).
Devices Connected to the NT1
ISDN Devices
#
Number
1
1
2
3
4
2
5
6
2 Set the Required Termination
You must set the NT1 and your ISDN devices to the termination
value indicated by Table 1.
Set the termination on your ISDN devices to the value specified
under "Termination—Other Devices." The manuals which came
with your ISDN devices can tell you how to do this.
To set the termination on the NT1, you manipulate five small switches
on the rear of the unit, shown in Figure 1, to match the settings given
under the heading "NT1 Switch Settings" in Table 1.
Select the termination setting
using these switches
Distance
up to 75 m
or 100
75 to 900 m
up to 75 m
or None
75 to 150 m
Table 1. Determining Termination Settings
Connect the power
supply to this port
Figure 1. Rear Panel
Eicon Network Termination (NT1) Installation Guide
Termination
NT1
ISDN
Devices
Ω
50
None
Ω
Ω
100
Ω
Ω
100
100
Ω
50
None
Ω
100
Ω
None
100
Connect your ISDN
wall socket to this port
NT1 Switch Settings
1
2
3
4
on
on
on
on
off on
off on
off on
off on
on
on
on
on
off off off off on
off off off off off
5
on
on
off
on
5
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