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i2022 ISDN Teleset
9
In the following application, the NT1 is equal in distance to both i2022 phones. The Terminating Resistors are set to “On”
at one of the phones and at the NT1.
Figure 8: Equal Distance Telesets
i2022 EQUIPPED WITH A U INTERFACE MODULE
The i2022 is available with an optional U Interface Module. Actually, the U Interface Module is an NT1 device, therefore,
the Teleset does not require an external NT1 device. Fig. 9 shows the i2022 equipped with a U Interface Module. The U
Interface is connected to the power adapter. The U Interface and power connection cable is connected to the “Line-In”
jack located on the U Interface Module in the rear of the Teleset.
Figure 9: Line and Power Jacks
TERMINATING RESISTORS
The i2022Teleset U Interface module has built-in Terminating Resistors. The Terminating Resistor switches are located
on the top of the Interface Module.
When the switches are in the On position, the
Terminating Resistors are installed. The value of
the resistors is 100 Ohms.
Options 1 2 3 4 5
Open OFF OFF OFF OFF -
100Ω ON ON OFF OFF -
50Ω ON ON ON ON -
Fixed - - - - ON
Adaptive - - - - OFF
The default setting is 50Ω (ohm) termination & adaptive timing mode
Table 3
The U Interface Module is an NT1. The Terminating Resistor switches must be set if adding a second device to the S
Interface. The following are guidelines for setting the Termination Resistor and Timing switches:
NOTE: The Interface Module must be removed from the Teleset
to gain access to the switches.