Long cables installed in a building, adapters, or cables with
bare wire at one end are examples in which only one connector
is available to be attached to CableEye. Such cables can be checked
provided you attach a "loopback"connector to the far
end; the loopback device adds known connections between adajacent
wires to create intentional "shorts" which CableEye
can pick up at the measured end. The with a loopback jump detected,
we know that both the outward-bound and inward-bound wires in
the cable are good. Start
1 +
| - After
you click "Test Cable", the program will ask you what
kind of connector is used. Select the appropriate one for the
left. On the right, where there will be no connections, the program
inserts a dummy Centronics 36-pin connector which can be ignored.
2 + | - If you use a loopback connector at the far end, put jumpers in the loopback connector that bridge all the conductors you are testing and expect to be present. This will establish a closed-circuit loop between the CableEye end and the far end of the cable. If you find the connection present, you know that both conductors that make up the bridge are functioning.
In any case, be sure any installed cables are completely disconnected from any signal sources before testing with CableEye.
Of course, you can always route a return cable from the far
end back to CableEye. If possible, this is the best solution since
no loopback is necessary. We have tested cables as long as 2000
feet with no problems, and the upper limit is likely to be even
longer.
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