Fluke CableIQ, Руководство пользователя

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CableIQ Qualification Tester
Users Manual
56
Locating Crosstalk and Impedance
Faults on Twisted Pair Cabling
The Find Crosstalk Fault and Find Impedance Fault
functions let you quickly check cable pairs for crosstalk
and impedance faults on twisted pair cabling.
Crosstalk is unwanted signal transmission between cable
pairs. Crosstalk can cause transmission errors in twisted
pair networks.
Impedance is electrical resistance to ac signals, such as
data and CATV transmissions. Impedance changes cause
signal reflections that can disrupt network operation and
cause poor CATV reception.
To find crosstalk or impedance faults:
Note
If you use patch cords at the near or far end
during crosstalk or impedance tests, Fluke
Networks recommends patch cords at least 2 m
long.
1 Connect the tester to twisted pair cabling. A
wiremap adapter or ID locator is not required.
2 Turn the rotary switch to DIAG .
3 Use
D
to highlight Find Crosstalk Fault or Find
Impedance Fault ; then press
H
or J .
4 To change the transmission standard, press H or
J , use
AD
to select a standard; then press
H .
5 To select a cable pair or pairs to test, press
D
to
highlight the pair(s), press H or
J
, use
AD
to select a pair or pairs; then press
H
.
6 Press
P
to start the test.
Table 3 describes the crosstalk and impedance fault
messages.