Page.68.
Repeat test:
Continue to test cable status,
length and attenuation.
Status:
After link up,
screen display "online",
if not link up or open circuit,
screen display "open
circuit",
if cable pair is short circuit,
screen display "short circuit".
Length:
The max test length is 180 meters,
when cable is open circuit or short circuit,
can test the cable
length,
if screen display "online",
the testing result would be not accurate.
Cable quality test:
Green is good quality cable,
Yellow is Poor quality cable,
Red is water poured
cable,
the attenuation value will be displayed when cable over 10 meters.
Advanced Test:
Test cable pair status,
length,
attenuation,
reflectivity,
impedance,
skew and other
parameters.
Attenuation reflectivity:
After link up,
if reflectivity value is 0,
it is the best quality communication
Impedance:
After link up, if the impedance value is 100Ω, it is the best quality communication,
the
range is generally in 85-135Ω.
Skew:
After 1000M link up,
when skew value is 0ns, it is the best quality communication,
if over 50ns,
will cause a Bit Error Rate in the transmission.
Cable sequence diagram:
A straight-
through and cross-over cable diagram,
the cable sequence display for reference.
Schmidt and Muller Telecommunications Pty Ltd trading as ELECTROCRAFT AUSTRALIA - ABN 79 067 000 426
