User Manual

Length / Timing

summary screen

Length: The length of the shortest cable pair (in feet). 330' is the

longest cable allowed by the 802.3 standard. The Real World Certi-

ﬁ er can test cables up to 1250' in length.

Propagation delay: The time it takes for a data signal to travel the

length of the cable (in nanoseconds). An abnormally long propaga-

tion delay indicates the cable is "too slow" for the application. Either

the cable itself is too slow or there is an error in the wiring. The stan-

dard allows a maximum 555 nsecs propagation delay (Cat 6 cables).

Skew: The difference in the propagation delay between the slowest

pair and the fastest pair in the cable (in nanoseconds). A small skew

insures that data, on each pair, will arrive at the receiver at about

the same time. A large skew reading causes errors. 50 nsecs is the

maximum allowable skew.

To continue reviewing, press the down arrow key ( ).

LENGTH = 201'

DELAY 304NS PASS

SKEW 3NS PASS

MENU REVIEW

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