EXFO CableSHARK P3 VF/DSL Cable Qualifier - Manual (Page 83)

CableSHARK P3 User Guide
71
MAX. CAP.
IMBALANCE
(%): Allows the user to specify the maximum capacitive length imbalance between T-G
and R-G. The default setting is 10%. Setting of Imbalance can be from 0.1% to 100%
where 100% is the worst case scenario. If the imbalance is greater than the user
defined setting the CableSHARK will not complete the test and will report
“Measurement not possible. Tip and Ring wires are substantially different
lengths.”
F1 LENGTH: Optional Feature: The CableSHARK is capable of bridging into the middle of a
circuit (intrusive) to measure from remote to CPE and ignore the cable from remote
to CO (called F1 circuit). This setting affects more measurements such as
Frequency Response, TDR, and DMT test. The F1 length is assumed to be longer
than the distance between the Remote Cabinet and the Customer.
Setting to 0 deactivates the function.
CABLE TYPE: This setting is used to select the appropriate cable type or more appropriately the
appropriate diameter. It is best however to ensure the correct VOP for the cable as
all cables are manufactured differently. The available options for Imperial
Measurement Units are 19, 22, 24, and 26 AWG. For METRIC Measurement Units,
the options are 0.4 mm PE, 0.5 mm PE, 0.6 mm PE , and 0.8 mm PE. Note: AWG =
American Wire Gauge.
The AUTO selection is based on an optimized algorithm whereby the user does not
need to know the cable gauge. It takes into account Resistance per unit length,
Capacitance per unit length and Attenuation per unit length, in addition to POTS
splitters.
VOP: Velocity of Propagation – VOP determines how quickly a pulse of energy travels
along a length of wire. It is entered as a ratio of the speed of light. (i.e., 0.6 of the
speed of light). A correct VOP will ensure accuracy in the test results. An incorrect
VOP can mean a result that indicates the loop is too long or too short. Changes
made to VOP will automatically be reflected in the VOP (m/
μs) setting and vice
versa. (Range is from 0.400 to 0.999)
VOP (m/ μs): Rather than specify the ratio of the speed of light for pulses traveling along a length
of wire, users can specify the speed in meters per microsecond. Changes made to
VOP (m/
μs) will automatically be reflected in the VOP setting and vice versa.
(Range is from 120 to 299 m/ μs)