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Reference Manual for the NETGEAR ProSafe Wireless Access Point 802.11g WG302

4

Glossary

July 2005 v3.0

for cables or wires. Bluetooth is a frequency-hopping technology in the 2.4 GHz frequency spectrum, with a 
range of 30 feet and up to 11Mbps raw data throughput. 

Bridge 

A product that connects a local area network (LAN) to another local area network that uses the same 
protocol (for example, wireless, Ethernet or token ring). Wireless bridges are commonly used to link 
buildings in campuses. 

Client or Client devices 

Any computer connected to a network that requests services (files, print capability) from another member of 
the network. Clients are end users. Wi-Fi client devices include PC Cards that slide into laptop computers, 
mini-PCI modules embedded in laptop computers and mobile computing devices, as well as USB and PCI/
ISA bus Wi-Fi radios. Client devices usually communicate with hub devices like access points and 
gateways. 

Collision avoidance 

A network node characteristic for proactively detecting that it can transmit a signal without risking a 
collision, thereby ensuring a more reliable connection. 

Crossover cable 

A special cable used for networking two computers without the use of a hub. Crossover cables may also be 
required for connecting a cable or DSL modem to a wireless gateway or access point. Instead of the signals 
transferring in parallel paths from one set of plugs to another, the signals "crossover." If an eight-wire cable 
was being used, for instance, the signal would start on pin one at one end of the cable and end up on pin 
eight at the other end. They "cross-over" from one side to the other. 

CSMA-CA (Carrier Sense Multiple Action) 

CSMA/CA is the principle medium access method employed by IEEE 802.11 WLANs. It is a "listen before 
talk": method of minimizing (but not eliminating) collisions caused by simultaneous transmission by 
multiple radios. IEEE 802.11 states collision avoidance method rather than collision detection must be used, 
because the standard employs half duplex radios—radios capable of transmission or reception—but not both 
simultaneously. 

Unlike conventional wired Ethernet nodes, a WLAN station cannot detect a collision while transmitting. If a 
collision occurs, the transmitting station will not receive an ACKnowledge packet from the intended receive 
station. For this reason, ACK packets have a higher priority than all other network traffic. After completion 
of a data transmission, the receive station will begin transmission of the ACK packet before any other node 
can begin transmitting a new data packet. All other stations must wait a longer pseudo randomized period of 
time before transmitting. If an ACK packet is not received, the transmitting station will wait for a subsequent 
opportunity to retry transmission 

Содержание WG3002

Страница 1: ...LANs and pertains to systems operating in the 5 GHz frequency range with a bandwidth of 54 Mbps Another standard 802 11g is for WLANS operating in the 2 4 GHz frequency but with a bandwidth of 54 Mbp...

Страница 2: ...defines software patches to WEP to provide a minimally adequate level of data privacy AES or AES OCB Advanced Encryption Standard and Offset Codebook is a robust data privacy scheme and is a longer te...

Страница 3: ...capabilities such as NAT routing DHCP firewalls security etc Ad Hoc mode A client setting that provides independent peer to peer connectivity in a wireless LAN An alternative set up is one where PCs...

Страница 4: ...wireless gateway or access point Instead of the signals transferring in parallel paths from one set of plugs to another the signals crossover If an eight wire cable was being used for instance the sig...

Страница 5: ...eries of numbers like 107 22 55 26 Every website has its own specific IP address on the Internet Encryption Key An alphanumeric letters and or numbers series that enables data to be encrypted and then...

Страница 6: ...may also provide VPN support roaming firewalls various levels of security etc Hot Spot also referred to as Public Access Location A place where you can access Wi Fi service This can be for free or fo...

Страница 7: ...nt AP As compared to Ad Hoc mode whereby PCs communicate directly with each other clients set in Infrastructure Mode all pass data through a central AP The AP not only mediates wireless network traffi...

Страница 8: ...of the spheres below represent a mesh router Corporate servers and printers may be shared by attaching to each mesh router For wireless access to the mesh an access point must be attached to any one...

Страница 9: ...rver or central hub or router All the networked PCs are equally able to act as a network server or client and each client computer can talk to all the other wireless computers without having to go thr...

Страница 10: ...nd alone mode in a parking lot or in a neighbor s building Rogue APs by definition are not under the management of network administrators and do not conform to network security policies and may presen...

Страница 11: ...the server in order to have a secret key exchange for that session Subnetwork or Subnet Found in larger networks these smaller networks are used to simplify addressing between numerous computers Subn...

Страница 12: ...ndwidth of up to 400 Mbps VoIP Voice over IP Voice transmission using Internet Protocol to create digital packets distributed over the Internet VoIP can be less expensive than voice transmission using...

Страница 13: ...or small business user needs to protect wireless data WEP is available in 40 bit also called 64 bit or in 108 bit also called 128 bit encryption modes As 108 bit encryption provides a longer algorith...

Страница 14: ...S CCMP These features are either not yet ready for market or will require hardware upgrades to implement Wi Fi Protected Access for the Enterprise Wi Fi Protected Access effectively addresses the WLAN...

Страница 15: ...ess for all Wi Fi clients and access points WiMAX An IEEE 802 16 Task Group that provides a specification for fixed broadband wireless access systems employing a point to multipoint PMP architecture T...

Страница 16: ...Reference Manual for the NETGEAR ProSafe Wireless Access Point 802 11g WG302 16 Glossary July 2005 v3 0...

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