18
UTP AND THIN ETHERNET REPEATERS
Fig. 4-6. Identifying Wire Pairs.
4.6.3 M
EASURE
P
HONE
W
IRE
Measure the lengths of phone wire that will connect the Repeaters using
an ohmmeter. Short-circuit one end of the phone wire and measure the
resistance between the two wires at the other end.
Multiply the resistance by 20 to find the length of the wire in feet. For
example, 54.6 ohms would indicate a cable length of about 1100 feet: 54.6
x 20 =1092. This formula works for 24 gauge phone wire. Refer to the
chart below for maximum acceptable resistance values of other wire
gauges. Attach a label to each pair showing its length. This will be useful
later if there is a cable fault.
To Repeater
To Repeater
To Repeater
To Repeater
1
2
3
A third point
cannot be
tied into
the link.
Summary of Contents for LZ1500A-R3
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