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Connecting Telephones Together
The Model 1040 has the capability to test two line telephone products. This document describes how the three telephone jacks found on the rear of the Model 1040 are wired and how to run tests on a two line telephone or telephone product.
Jack Wiring Description:
As can be seen in the image above, the Model 1040 has three telephone jacks. The
leftmost is jack 1A, the middle one is jack 1B, and the rightmost is
jack 2. However, the Model 1040 only has two telephone
lines. Why are there three jacks when there are only two simulated telephone
lines? The jacks are wired as follows:
As you can see in the chart, jack 1B shares both line 1 and line 2! This means that you can plug a two line telephone into jack 1B and test both of its lines. You can also connect a single line telephone to jack 1B but it will connect only to line 1 of the Model 1040.
One way to test the basic operation of a two line telephone is to use three
telephones. Plug the two line telephone into jack 1B. Plug a single
line telephone into jack 1A and another into jack 2. Now you can place
calls as seen in the following table. (Note that the simplest way to place a call to the other line is to
dial a single "5"; see Hint #4 - Model 1040
Command Reference for more information about placing calls from one line to the
Of course you don't need to have three telephones to test a two line telephone. If you only have one single line telephone you can use it in jack 1A to call line 2 of the two line telephone and then unplug the single line telephone and plug it into jack 2 of the Model 1040 to call line 1 of the two line telephone.
You can also test the two line telephone by itself by entering commands such as:
Please refer to Hint #4 - Model 1040 Command
Reference for further information regarding these and other commands.
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