Microtest TSB-67 - 568A Annex E - Manual (Page 44)

Press Limits (F4) to display and change Attenuation limits at various frequencies.
Press Save (F1) to store the new values.
Press the ESCAPE key to return to the Attenuation screen.
Note: See Customizing Attenuation Limits in Chapter 3 for more information on Attenuation
limits.
Length/Delay
To display the LENGTH/DELAY screen, press the Measure Cable Performance key, then select
Length/Delay .
The pairs are shown on the left and the length for each pair is shown in the second column. The
third column shows the propagation delay values in nanoseconds (nS) and the fourth column
indicates the condition of the wire pair (open or short). The Skew value is the worst-case value of
the difference in propagation delay between the wire pairs.
Press the ESCAPE key to return to the MEASURE CABLE PERFORMANCE screen.
Impedance
To display the IMPEDANCE screen, press the Measure Cable Performance key, then select
Impedance .
The pairs are shown on the left and the impedance values in ohms (
Ω
) are shown on the right.
Press the ESCAPE key to return to the Measure Cable Performance screen.
Loop Resistance
To display the LOOP RESISTANCE screen, press the Measure Cable Performance key, then
select Loop Resistance .
The pairs are shown on the left and the loop resistance values in ohms (
Ω
) are shown on the right.
Press the ESCAPE key to return to the MEASURE CABLE PERFORMANCE screen.
Capacitance
To display the CAPACITANCE screen, press the Measure Cable Performance key, then select
Capacitance .
The pairs are shown on the left and the capacitance values in picofarads (pF) are shown on the
right.
Press the
ESCAPE key to return to the Measure Cable Performance screen.
Noise
Noise is undesirable electrical activity that interferes with a network’s ability to transmit data
reliably. Noise sources in networks may include AC transmission lines, fluorescent light fixtures,
industrial equipment, elevators, etc. Noise problems also occur when other wire pairs in the same
sheath are used for non-LAN applications.