Some discrepencies between study materials

flammablecamel

I've used multiple sources to prepare for the net+ and I get different information from different sources, very frustrating. Was trying to get some of this cleared up.

My sybex net+ 4th edtion book says that 1000baseLX is 550mm 2000sm but the technotes here say 550 mm 5000sm(talking segment length).

Plantwiz

First,
This is why it is important to use more then 1 source. So it maybe frustrating, but going all the way back to schooldays you likely had teachers and Professors encourage you to use more then one source. No different in the 'real world'

Second,
I don't have the Sybex book, how is this discrepancy worded? Using two sources there may not be reporting on the same thing.

Third,
have you check the errata for Sybex? Any errors or reported corrections will be there.


Last,
I'll try to see if I can find both in their original context, however I'm suspecting one is reporting about one thing and the second another. Also, for cable discrepancies....one can always go straight to the governing body.... www.ieee802.org/3 and
http://standards.ieee.org/getieee802/