home 
wiki
wiki
Spelling: GlossaryFAQ
This is a repository for the technical terms and acronyms which crop
up in all this wireless networking hoo-ha.
Please feel free to add entries, using the EditText link at the
bottom. Try to them as simple and clear as possible. If the term you
seek is not defined here, please add it to the listing, and maybe
someone will come along and fill it in later. Use blank lines for
spacing between entries.
If you can correct an incorrect entry, or clarify an inadequate one,
please do so. You can also click on many of the titles to get a very
detailed description of the term.
The concept of a glossary in a wiki is a bit strange, it's like
including a glossary within an encylopaedia. You can use WordList [1]
or TitleSearch [2] instead to get a list of terms instead if you wish.
-------------------------
* Numbers [3]
* 802.11b [4]
* A [5]
* Airport [6]
* AP or Access Point [7]
* Ad-hoc [8]
* B [9]
* BSS [10]
* Bridge [11]
* C [12]
* Cardbus [13]
* D [14]
* dB [15]
* DeCSS [16]
* DHCP [17]
* DoS [18]
* Downconverter [19]
* DSSS [20]
* E [21]
* EIRP [22]
* Ethernet [23]
* F [24]
* G [25]
* H [26]
* I [27]
* J [28]
* K [29]
* L [30]
* M [31]
* N [32]
* O [33]
* P [34]
* Q [35]
* R [36]
* S [37]
* T [38]
* U [39]
* UHF [40]
* UPN [41]
* Unix [42]
* V [43]
* VHF [44]
* VPN [45]
* W [46]
* WAN [47]
* WLAN [48]
* WiFI [49]
* Windows [50]
* X [51]
* Y [52]
* Z [53]
* Other Glossaries [54]
-------------------------
NUMBERS
802.11B [55]
The wireless networking standard predominantly used by Melbourne
Wireless.
-------------------------
A
AIRPORT [56]
Apple's implementation of the 802.11b [57] or WiFi [58] Standard
AP OR ACCESS POINT [59]
An AccessPoint [60] is a dumb device, it's usually made up of the
same card used in client setups with a bit more software to make it
send out "beacon" packets, this then makes devices act by sending all
packets via it...
AD-HOC [61]
Where any node talks directly to the node it wishs to communicate
with, if it can't see it, it can't talk.
-------------------------
B
BSS [62]
Basic Service Set. This mode is required to be provided by any node
that is going to be a base station in an infrastructure based network.
(ie node talks to base station, base station talks to destination
node)
BRIDGE
A client connection more or less, it talks to an AP or another bridge
(but not in ad-hoc) and links 2 wired networks together, bridges
usually also are able to act as access points, but not usually
simultaneously
-------------------------
C
CARDBUS
The 32-bit improved version of PCMCIA
-------------------------
D
DB
Decibel - a logarithmic representation of power ratios. See
PowerAndGainToDecibels [63] for more information.
DECSS
A decryptor for the Content Scrambling System (CSS)
DHCP [64]
Dynamic Host Configuration Protocol (typically used for handing out
IP details to clients which request them)
DOS
Denial of Service, a lack of network access caused by flooding a node
or path, can be accidental or deliberate (as in DoS [65] attack)
DOWNCONVERTER [66]
DSSS [67]
Direct sequence spread spectrum. The form of spread spectrum used in
802.11b [68]. See also FHSS [69].
----------
E
EIRP
Effective Isotropic Radiated power - The power of a radio transmitter
multiplied by the total gain of its antenna and feedline. Wireless
networks in Australia are allowed 4 watts EIRP between 2.4 and 2.483.5
GHz
ETHERNET
A data-link layer (layer 2 in the OSI model) protocol
----------
F
FHSS [70]: Frequency Hopping Spread Spectrum. Specified as one of the
options in the 802.11 standard, and used by early gear from Proxim,
Breeze, RoamAbout [71], Symbol and others. See also DSSS [72].
----------
G
----------
H
HF: High Frequency - Otherwise known as Shortwave. Frequencies
between 3 and 30 MHz, commonly used for shortwave broadcasting, CB and
amateur radio.
----------
I
IBSS [73] mode: Peer-to-peer mode (more?)
IEEE: Institute of Electrical and Electronic Engineers. When followed
by a number, refers to a standard adopted by that august body. Hence
WiFI [74] is IEEE standard 802.11b, Firewire is IEEE 1394. Blame them.
IPSEC: Short for IP Security. Designed to securely exchange packets
at the IP layer (OSI layer 3). Involves encryption of the header with
AH or the data with ESP.
ISA: Industry Standard Architecture. An older standard for adding
internal cards to the motherboard of your computer. See also PCI
----------
J
----------
K
----------
L
LAN: Local Area Network
LF: Low Frequency - 30 - 300 kHz.
Linux [75]: An open-source version of Unix (linux is actually not a
version of unix at all. It's a rewrite. "open sourced unix-like
system" is more correct)
LNB [76]
LoS [77]: Line of Sight
----------
M
MAC [78]: Media Access Control. Includes collision detection (and
usually prevention) techniques. Also, MAC Address usually refers to
the ethernet address present at the MAC layer. Also, MAC, short name
for an Apple Macintosh computer.
MF: Medium Frequency or medium wave - Frequencies between 300 kHz and
300 MHz. Used by AM broadcast stations.
Microwave: Area of radio spectrum from 1.6-30Ghz (the actual extent
changes depending who you listen to.
http://hyperphysics.phy-astr.gsu.edu/hbase/ems2.html is one place
where spectrum classes are "reasonable")
(the part of the radio spectrum at which 802.11b [79] devices work,
around the 2.4 gigahertz frequency. Also a way of preparing tasty pot
noodles.)
----------
N
N-connector: Coaxial cable connector used in many UHF (Ultra High
Frequency) radio applications. Presents a constant 50 ohm charactistic
impedance at frequencies well beyond 1 GHz.
NIC: Network Interface Card.
----------
O
OSPF [80]: Open Shortest Path First - A scheme for route
auto-discovery & management (loop discovery, deals with redundant
paths, etc etc.)
OpenBSD [81]: Another UNIX-Like Operating System. - Focused on
pro-active security and code auditing.
----------
P
PCI: Peripheral Component Interconnect. A standard for adding
internal cards to a computer. See also ISA.
PCMCIA: People Can't Memorise Computer Industry Acronyms. Standard
for peripheral cards for laptops and other small devices. A common
form factor for wireless networking adapters.
(actually it stands for Personal Computer Memory Common Interface
Adapter)
PHY [82]: Abbreviation for the Physical layer within the IEEE 802.3
Ethernet specification.
In wired ethernet, it is comprised of a Physical Signaling (PLS)
subsystem, Attachment Unit Interface (AUI) and the Medium Attachment
Unit (MAU).
Examples are 10base-2 (aka thinwire, cheapernet), 10base-T, etc.
Pigtail [83]: connects from the antenna connector on a wireless card
or device to an external antenna. Often converts a manufacturer's
proprietary connector to a more common type. Or may be directly
soldered to a cable. (Also, found near the "output" port of pigs)
PoE [84]: Power over Ethernet
----------
Q
QoS [85]: Quality of Service
----------
R
RAN: Regional (or Residential ?) Area Network
RF: Radio Frequency
Router: Could be a dedicated device such as cisco make, or *nix
boxes, and depending on the level of sophistication weather it's
dynamic or static routing... most dynamic routing devices are 3rd
party to the wireless devices, except in the case of a *nix box.
----------
S
SHF: Super High Frequency - Frequencies between 3 and 30 GHz. 802.11a
[86] (5 GHz) wireless networking falls within this region.
Spread Spectrum: A technique for radio transmission of data which
uses significantly more bandwidth than is strictly necessary. Spread
spectrum was developed originally for secure military communications,
but is now used commercially in mobile phones (CDMA) and wireless
networks. Spread spectrum communications is more tolerant of
co-channel interference and multipath effects than traditional
narrownabd communications. Tutorial [87]
----------
T
TCP/IP: Transfer Control Protocol/Internet Protocol - the suite of
protocols used by the Internet.
----------
U
UHF
Ultra High Frequency - Frequencies between 300 MHz and 3 GHz. Used
for UHF TV, commercial 2 way radios, UHF CB and 802.11b wireless
networking (2.4-2.83 GHz).
UPN
Universal Public Network
UNIX [88]
A multi user, multitasking operating system developed by Bell Labs
around 1970.
----------
V
VHF
Frequencies between 30 and 300 MHz. Used for commercial 2 way radio,
VHF TV and FM broadcasting.
VPN
Virtual Private Network - technique for creating low cost secure
links using encrypted tunnels over public networks such as the
Internet.
----------
W
WAN
Wide Area Network
WLAN
Wireless LAN
WIFI
Wireless Industry Forum on Interoperability (?) A standard to ensure
different manufacturer's wireless devices can connect to each other
WINDOWS
A non-operating system ( ). Actually, a proprietry operating system
produced by Microsoft Corp. Very popular in business and the mass
consumer market, but scorned by many serious computer tinkerers.
Windows is very closed with little documentation of its API
(Application Programming Interface) functions, in contrast to Linux
and the free BSD UNIX systems, which come with documentation and full
source code.
----------
X
----------
Y
----------
Z
-------------------------
OTHER GLOSSARIES
* http://www.personaltelco.net/index.cgi/CategoryGlossary [89]
* http://www.weca.net/OpenSection/glossary.asp? [90]
Links:
------
[1] http://melbournewireless.org.au/?WordList
[2] http://melbournewireless.org.au/?TitleSearch
[3] http://melbournewireless.org.au/#numbers
[4] http://melbournewireless.org.au/#_802_11b_
[5] http://melbournewireless.org.au/#a
[6] http://melbournewireless.org.au/#_appleairport_airport_
[7] http://melbournewireless.org.au/#ap_or__accesspoint_access_point_
[8] http://melbournewireless.org.au/#_adhocmode_ad_hoc_
[9] http://melbournewireless.org.au/#b
[10] http://melbournewireless.org.au/#_bss_
[11] http://melbournewireless.org.au/#bridge
[12] http://melbournewireless.org.au/#c
[13] http://melbournewireless.org.au/#cardbus
[14] http://melbournewireless.org.au/#d
[15] http://melbournewireless.org.au/#db
[16] http://melbournewireless.org.au/#decss
[17] http://melbournewireless.org.au/#_dhcp_
[18] http://melbournewireless.org.au/#dos
[19] http://melbournewireless.org.au/#_downconverter_
[20] http://melbournewireless.org.au/#_dsss_
[21] http://melbournewireless.org.au/#e
[22] http://melbournewireless.org.au/#eirp
[23] http://melbournewireless.org.au/#ethernet
[24] http://melbournewireless.org.au/#f
[25] http://melbournewireless.org.au/#g
[26] http://melbournewireless.org.au/#h
[27] http://melbournewireless.org.au/#i
[28] http://melbournewireless.org.au/#j
[29] http://melbournewireless.org.au/#k
[30] http://melbournewireless.org.au/#l
[31] http://melbournewireless.org.au/#m
[32] http://melbournewireless.org.au/#n
[33] http://melbournewireless.org.au/#o
[34] http://melbournewireless.org.au/#p
[35] http://melbournewireless.org.au/#q
[36] http://melbournewireless.org.au/#r
[37] http://melbournewireless.org.au/#s
[38] http://melbournewireless.org.au/#t
[39] http://melbournewireless.org.au/#u
[40] http://melbournewireless.org.au/#uhf
[41] http://melbournewireless.org.au/#upn
[42] http://melbournewireless.org.au/#_unix_
[43] http://melbournewireless.org.au/#v
[44] http://melbournewireless.org.au/#vhf
[45] http://melbournewireless.org.au/#vpn
[46] http://melbournewireless.org.au/#w
[47] http://melbournewireless.org.au/#wan
[48] http://melbournewireless.org.au/#wlan
[49] http://melbournewireless.org.au/#wifi
[50] http://melbournewireless.org.au/#windows
[51] http://melbournewireless.org.au/#x
[52] http://melbournewireless.org.au/#y
[53] http://melbournewireless.org.au/#z
[54] http://melbournewireless.org.au/#other_glossaries
[55] http://melbournewireless.org.au/?802.11B
[56] http://melbournewireless.org.au/?APPLEAIRPORT
[57] http://melbournewireless.org.au/?802.11b
[58] http://melbournewireless.org.au/?WiFi
[59] http://melbournewireless.org.au/?ACCESSPOINT
[60] http://melbournewireless.org.au/?AccessPoint
[61] http://melbournewireless.org.au/?ADHOCMODE
[62] http://melbournewireless.org.au/?BSS
[63] http://melbournewireless.org.au/?PowerAndGainToDecibels
[64] http://melbournewireless.org.au/?DHCP
[65] http://melbournewireless.org.au/?DoS
[66] http://melbournewireless.org.au/?DOWNCONVERTER
[67] http://melbournewireless.org.au/?DSSS
[68] http://melbournewireless.org.au/?802.11b
[69] http://melbournewireless.org.au/?FHSS
[70] http://melbournewireless.org.au/?FHSS
[71] http://melbournewireless.org.au/?RoamAbout
[72] http://melbournewireless.org.au/?DSSS
[73] http://melbournewireless.org.au/?IBSS
[74] http://melbournewireless.org.au/?WiFI
[75] http://melbournewireless.org.au/?Linux
[76] http://melbournewireless.org.au/?LNB
[77] http://melbournewireless.org.au/?LoS
[78] http://melbournewireless.org.au/?MAC
[79] http://melbournewireless.org.au/?802.11b
[80] http://melbournewireless.org.au/?OSPF
[81] http://melbournewireless.org.au/?OpenBSD
[82] http://melbournewireless.org.au/?PHY
[83] http://melbournewireless.org.au/?Pigtail
[84] http://melbournewireless.org.au/?PoE
[85] http://melbournewireless.org.au/?QoS
[86] http://melbournewireless.org.au/?802.11a
[87] http://sss-mag.com/ss.html
[88] http://melbournewireless.org.au/?UNIX
[89] http://www.personaltelco.net/index.cgi/CategoryGlossary
[90] http://www.weca.net/OpenSection/glossary.asp?
[EditText] [Spelling] [Current] [Raw] [Code] [Diff] [Subscribe] [VersionHistory] [Revert] [Delete] [RecentChanges]