802.11 Wireless Networks: The Definitive Guide

Errata for 802.11 Wireless Networks: The Definitive 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 9
Top

IEEE first ical then onics

Note from the Author or Editor:
Change IEEE acronym expansion to "Institute of Electrical and Electronics Engineers"

Anonymous    Apr 05, 2013
Printed
Page 17
Last paragraph

In the 6th line of the last paragraph there is a sentence:"Associations are also exclusive on the part of the mobile station: a mobile station can be associated with only one access point." Although it is quite logical I would still suggest that at the end of this sentence you add: "... at one time."

Note from the Author or Editor:
This is a good suggestion. Any fix should incorporate a discussion of 802.11r.

Primoz  Jun 20, 2011  Apr 05, 2013
Printed
Page 19
Paragraphs following heading 'Multi-BSS environments ..'

Paragraph 1 "An AP could have connect users to .." Paragraph 2 "Within the AP, each SSIDs .." Paragraph 3 "(... the internal network is probably protected by authentication prevent unauthorized use.)"

Note from the Author or Editor:
Change the paragraphs as follows: 1. "An AP can connect users..." 2. "Within the AP, each SSID..." 3. "...the internal network should be protected by authentication to prevent unauthorized use"

Anonymous    Apr 05, 2013
Printed
Page 42
1C

However, there is a longer congestion window when transmissions... should be: However, there is a longer contention window when transmissions...

Anonymous    Feb 18, 2011
Printed
Page 44-45
Bottom of p.44 to p.45

Several sentences are repeated: "Wireless LAN stations...effective throughput."

Anonymous    Feb 18, 2011
Printed
Page 62
Paragraph 2

Sentence is incoherent: "Speed negotiation is particu-larly that are available to stations."

Note from the Author or Editor:
Remove the sentence.

Anonymous    Apr 05, 2013
Printed
Page 75
3rd paragraph

"Frames from the distribution system have the ToDS bit set, ..." might be changed to Frames to the distribution system have the ToDS bit set, ..."

Note from the Author or Editor:
Change the word "from" to "to" as suggested by the comment.

Anonymous    Apr 05, 2013
Printed
Page 76
Figure 4-11, "Type=data" field in bottom row

"1 0" should be: "0 1"

Anonymous    Feb 18, 2011
Printed
Page 78
Figure 4-14

Duration in RTS: 3xSIFS + ACK + frame time should be: Duration in RTS: 3xSIFS + CTS + ACK + frame time

Anonymous    Feb 18, 2011
Printed
Page 94
Figure 4-33

Note that the existing unconfirmed errata for page 95 should be removed if this one is accepted. Changing the bits in the figure means that the exisiting text can be kept as printed. The bits in the section labeled "2Mps, mandatory" are: 0 1 0 0 0 0 0 should be: 0 0 1 0 0 0 0

Note from the Author or Editor:
This figure needs to have its bit significance corrected. The figure is supposed to depict least significant bits first (which is the transmission order), but many of the figures in this book have been shown in network bit order.

Gary Kato  Jul 10, 2009 
Printed
Page 95
1st paragraph

"2-Mbps" should be changed to "1-Mbps" because the first example of Supported rate is "0000010" in hex, corresponding rate of this binary value is "2 Mbps" as in Table 4-8.

Note from the Author or Editor:
This is the best suggested fix to the figure.

Anonymous   
Printed
Page 104
Figure 4-50

The Version field in the RSN information element incorrectly shows 1 (byte) above the field instead of 2(bytes).

Note from the Author or Editor:
Change the version number to be two bytes long instead of 1.

Anonymous    Apr 05, 2013
Printed
Page 150
"Per-frame keying" subsection, last sentence

"The process by which a unique key is derived for each key is called key mixing." should be: "The process by which a unique key is derived for each frame is called key mixing."

Anonymous    Feb 18, 2011
Printed
Page 154
2nd and 3rd sentences

"The 16 low-order bytes are used to generate a WEP IV. The middle byte of the WEP IV is constructed so that it avoids generating weak RC4 keys." should be: "The 16 low-order bits are used to generate the low and high bytes of a WEP IV. The middle byte of the WEP IV is a dummy byte of fixed value, chosen to avoid generating weak RC4 keys."

Anonymous    Feb 18, 2011
PDF
Page 162
The item number 1.

The author is talking about CCMP, so in the first item I think it should be: 1. The 802.11 frame is queued for transmission. It consists of a frame header and the payload. Like TKIP, CCMP protects only the payload ofthe 802.11 MAC, and leaves the 802.11 frame header, as well as any lower-layer headers, intact. Instead of: 1. The 802.11 frame is queued for transmission. It consists of a frame header and the payload. Like WEP, TKIP protects only the payload ofthe 802.11 MAC, and leaves the 802.11 frame header, as well as any lower-layer headers, intact.

Note from the Author or Editor:
Suggested fix to item 1: "The 802.11 frame is queued for transmission. It consists of a frame header and the payload. Unlike WEP and TKIP, CCMP protects both the payload and header of and the 802.11 MAC."

rzaslap  Nov 02, 2011  Apr 05, 2013
Printed
Page 178-179
Last paragraph of 178, first 2 paragraphs of 179

The discussion of shared-key authentication incorrectly identifies several components of the frames as information elements. However, the Authentication Algorithm Number (8.4.1.1), the Authentication Transaction Sequence Number (8.4.1.2), Status Code (8.4.1.9) are all fixed fields, not information elements. The Challenge Text (8.4.2.9) is an information element. Each of the numerical identifiers in this erratum identifies the location and description of the components of the frame in the 802.11-2012 revision.

Matthew Gast
Matthew Gast
O'Reilly AuthorO'Reilly Blogger 
Mar 10, 2013 
Printed
Page 192
Figure 8-14

In Figure 8-14, the second frame transmitted by the AP in the fifth Beacon interval is labeled "MC" for multicast. That frame should be a unicast frame.

Matthew Gast
Matthew Gast
O'Reilly AuthorO'Reilly Blogger 
Mar 10, 2013  Apr 05, 2013
Printed
Page 196
Figure 8-18 and line 1

Figure 8-18: Switch location of "Frame to 2,3, and 4" and "Frame to 1" line 1: change to : remain active until the conclusion of the next ATIM window...

Note from the Author or Editor:
Both of the reader's suggestions are correct. Make the suggested changes to the figure and text.

Anonymous    Apr 05, 2013
Printed
Page 210
Figure 8-24

Action Value should be 1

Note from the Author or Editor:
The commenter is correct.

Anonymous    Apr 05, 2013
Printed
Page 213
Figure 8-26

The channel switch announcement (CSA) frame is shown to include a dialog token when in fact this is not the case. A dialog token is used for the other Spectrum Management action frames, but according to section 7.4.1.5 of the IEEE STD 802.11 - 2007, CSA frames do not use dialog tokens.

Note from the Author or Editor:
The commenter is correct. Remove the Dialog Token field.

Robert van Coppenhagen  Sep 23, 2009  Apr 05, 2013
Printed
Page 235
fórmula para calcular el 'path loss'

En el libro se da como fórmula para calcular el 'free-space loss': FLSB= 32.5 + 20·log F + log d Sin embargo, en la documentación que he manejado, parece que la fórmula correcta sería: FLSB= 32.5 + 20·log F + 20·log d La fórmula también aparece en la página 446

Note from the Author or Editor:
The commenter's equation is correct (see https://en.wikipedia.org/wiki/Free-space_path_loss). The resulting figures probably need to be corrected.

Anonymous    Apr 05, 2013
Printed
Page 251
Figure 11-10

picture of receiver has 1st block label PLCP. other authors put GFSK demodulator there.

Note from the Author or Editor:
The commenter is correct.

Anonymous    Apr 05, 2013
Printed
Page 251
bottom

PCLP = PLCP

Anonymous    Apr 05, 2013
Printed
Page 254
3rd paragraph toward the bottom

Typo: Original: "Every chunk of 11 chips is the compared to an identical ship stream." Corrected: "Every chunk of 11 chips is then compared to an identical ship stream."

Anonymous    Feb 18, 2011
Printed
Page 260
1st paragraph under 'Differential Phase Shift Keying (DPSK)'

Typo: Original: "Figure 12-8 shows two identical sine waves shifted by a small amount along the time axis." Corrected: "Figure 12-9 shows two identical sine waves shifted by a small amount along the time axis."

Anonymous    Feb 18, 2011
Printed
Page 264
Header field description

"Five fields comprise the header: ..." There only four fields in the header.

Matthew Gast
Matthew Gast
O'Reilly AuthorO'Reilly Blogger 
Mar 08, 2013  Apr 05, 2013
Printed
Page 272
Bullet #1 in the 'Transmission at 5.5Mbps with CCK' section

Typo: Original: "The MAC frame embedded in the PCLP frame is divided into a string of 4-bit blocks." Corrected: "The MAC frame embedded in the PLCP frame is divided into a string of 4-bit blocks."

Anonymous    Feb 18, 2011
Printed
Page 276
Last sentence

Typo: Original: "...and how the PCLP wraps up frames for transmission." Corrected: "...and how the PLCP wraps up frames for transmission."

Anonymous    Feb 18, 2011
Printed
Page 281
2nd paragraph, 4th sentence

"...as a strong opdpresence and a relatively smaller..." should read "...as a strong presence and a relatively smaller..."

Note from the Author or Editor:
Change the misspelled word to "presence" as suggested.

Anonymous    Apr 05, 2013
Printed
Page 301
figure 14-1 b) RTS-CTS protection mechanism

full protection mechanism in ERP OFDM PHY RTS-CTS communication is used beatwean sender station and receiver station is it not? on figure 14-1 b) IEEE 802.11g station sends RTS to 802.11b which responds with CTS msg. then g station send OFDM data frame to someone.... WHY DOES 802.11b RESPOND on RTS whith CTS , IT CANT BE RECEIVER BECAUSE IT DOES NOT understand OFDM ?

Note from the Author or Editor:
When sending an RTS, a station must use a data rate that is understood by all stations (a "basic rate" for the BSS). Even though the transmitter of the RTS is an 802.11g station, it will use 802.11b rates to send the RTS. This is shown by the labeling of the RTS as "DSSS/CCK" referring to the transmission methods of the 802.11 direct sequence and 802.11b high-rate direct sequence. However, in Figure 14-1(b), the 802.11b station will receive, not transmit the CTS.

Anonymous   
Printed
Page 305
figure 14-3

Preamble + Signal field = Rate Res Length Parity Tail or Signal field = Rate Res Length Parity Tail? the 1st line which joins physical and logical PDU should be moved to the end of preamble

Note from the Author or Editor:
The commenter's suggestion is correct.

Anonymous    Apr 05, 2013
Printed
Page 305
figure 14-4

modulation for PLCP header PBPSK and DQRSK ?? It should be DBPSK DQPSK?

Note from the Author or Editor:
The comment's suggestion is correct.

Anonymous    Apr 05, 2013
Printed
Page 309
figure 14-7

on the picture is txt : short: 48 bits @ 1 Mbps DBPSK i think it should be : short: 48 bits @ 2 Mbps DQPSK

Note from the Author or Editor:
The comment is correct.

Anonymous    Apr 05, 2013
Printed
Page 309
figure 14-7

Long traning durration 8 MS (makro ?) shuld be : Long traning durration 8 mikroS

Note from the Author or Editor:
The comment is correct. Capital M should be replaced by the Greek letter mu.

Anonymous    Apr 05, 2013
Printed
Page 310
Bullet #2 under the 'Reception Procedure' section

Typo: Original: ...and find the end of the preamble to see the PCLP SIGNAL and SERVICE fields." Corrected: ...and find the end of the preamble to see the PLCP SIGNAL and SERVICE fields."

Anonymous    Feb 18, 2011
Printed
Page 319
Data rate formula

The data rate formula start with the constant 0.0675 where is should be 0.675. The 0 is an error resulting in 10x lower data rate.

Note from the Author or Editor:
The WWiSE proposal was one of two competing proposals for 802.11n. For details on the final standardized 802.11n, see 802.11n: A Survival Guide. This chapter will be removed from any future editions of the book.

Anonymous   
Printed
Page 335
first line

"It is unlikely that most client devices will be unable to send beamformed transmissions." this sentence should read: "It is unlikely that most client devices will be able to send beamformed transmissions."

Anonymous    Feb 18, 2011
Printed
Page 337
Next to the last paragraph toward the bottom

Typo: Original: "Q-BPSK uses two data points in its constellation, but they are present on the in the quadrature component." Corrected: "Q-BPSK uses two data points in its constellation, but they are present in the quadrature component."

Anonymous    Feb 18, 2011
Printed
Page 347
Intel indent, in the last line

"the the Centrino 80211g interface" should be: "the Centrino 80211g interface"

Anonymous    Feb 18, 2011
Printed
Page 348
3rd line from the bottom

"wireles" instead of "wireless"

Anonymous    Feb 18, 2011
Printed
Page 428
Bottom of box

Change two URLs from www.live.com to www.live555.com

Anonymous    Feb 18, 2011
Printed
Page 465
Figure 21-8

Should User Y's "bcast 7" be "bcast 1"?

Note from the Author or Editor:
Yes. The commenter is correct.

Anonymous    Apr 05, 2013
Printed
Page 540
5th paragraph, 3rd sentence

"Gaining access...often requires...a liability waver." should be: "Gaining access...often requires...a liability waiver."

Anonymous    Feb 18, 2011