802.11n: A Survival Guide

Errata for 802.11n: A Survival Guide

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The errata list is a list of errors and their corrections that were found after the product was released. If the error was corrected in a later version or reprint the date of the correction will be displayed in the column titled "Date Corrected".

The following errata were submitted by our customers and approved as valid errors by the author or editor.

Color Key: Serious Technical Mistake Minor Technical Mistake Language or formatting error Typo Question Note Update



Version Location Description Submitted By Date Submitted Date Corrected
Printed
Page Page xiii
How to contact us sub section for errata (mid page)

ERRATA: 802.11n A survival Guide Matthew S. Gast ISBN 978-1-449-31204-6 Incorrect HTTP reference Change from http://orei.ly/802_11n to http:oreilly.com or Fully Qualified URL (as at Monday 14th May 2012 http://oreilly.com/catalog/errata.csp?isbn=0636920021988

Note from the Author or Editor:
Change the URL from ("orei" (DOT) "ly") to ("oreil" DOT "ly"). The L before the dot is missing in "http://oreil.ly/802_11n"

Anonymous  May 14, 2012  Mar 30, 2012
Printed
Page 18
Figure 3-2

In Figure 3-2, the upper part of the diagram shows an 802.11n channel ranging from carrier -26 to +26. It should be -28 to +28 (as shown, in fact, in Figure 3-1).

Matthew Gast
Matthew Gast
O'Reilly AuthorO'Reilly Blogger 
May 21, 2012  Mar 22, 2013
Printed, PDF
Page 20
On page 20; for Figure 3-3.

On page 20; for Figure 3-3. Available channel map (5 GHz). The right side column of 5 GHz channel numbers are all wrong, that should be channels 149, 153, 157, 161, and 165. In addition, the center channel column, I do not think the USA can use channel 144, looking at the 5 GHz channel maps and articles I can find online none of them seem to say that any country can use channel 144. I think this should stop at channel 140 and 5710 MHz.

Note from the Author or Editor:
Replace the five numbers in the 5735 to 5835 band. In the figure, they read 128-132-136-140-144. They should be replaced with the numerical sequence of 149-153-157-161-165.

Anonymous  Apr 25, 2012  Mar 22, 2013
Printed
Page 26
HT Length description.

In Chapter 3, page 26 in the HT Length description it says that the range for the length of the PSDU in bytes can range up to 65,536. I think this is incorrect - since a 16-bit value ranges from 0-65535.

Terry Simons  Sep 17, 2012  Mar 22, 2013
Printed
Page 27
Fig. 3-7, to the right of FEC1 and FEC2

Box containing "stream pauser" should read "stream parser".

Howard Higgins  Jun 25, 2012  Mar 22, 2013
Printed
Page 43
Chapter 5 MAC Basics (Frame Changes) Figure 5-2 HT Capabilities Info

HT Capabilities Information Element displays the following error which I bring to your attention for correction. The Capabilities Information Element block diagram (second from the top in a series of four) is described as having a length of two bytes. The field is decomposed into a further block diagram detailing the individual bits sited above the HT Capabilities Information Element block. A quick arithmetic count shows the total to be 15 bits or one bit short of 16 bits (two octets).

Note from the Author or Editor:
In Figure 5-2, change the "1" above the "Rx STBC" field to a "2".

Anonymous  May 14, 2012  Mar 22, 2013
Printed
Page 46
United States

Figure 5-4. A-MPDU aggregation. The second portionof the figure is labeled "MPDM Aggregation" but should be labled "MPDU Aggregation"

Anonymous  Jan 30, 2013  Mar 22, 2013
Printed
Page 113
Closing date

The afterword is dated January 2011. It was written in January 2012.

Matthew Gast
Matthew Gast
O'Reilly AuthorO'Reilly Blogger 
Jun 11, 2012  Mar 22, 2013