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182

Glossary

Appendices

PTP-IP (Picture Transfer Protocol over Internet Protocol): A commonly used name

for the CIPA DC-005-2005 image transfer protocol for transmitting images

over LANs. It represents an extension to the Picture Transfer Protocol (PTP)

used to transfer images between cameras and computers connected via

USB cable. The WT-4 uses PTP-IP to communicate with host computers.

Shared key: An authentication system in which WEP keys are used to

establish whether a client has access to the network. Communication is

restricted to devices with the same WEP key.

SS-ID (Service Set ID): An SS-ID prevents interference between devices in

different networks by allowing communication only between devices that

share an SS-ID. See BSS-ID, ESS-ID.

Sub-net mask: A mask that divides a network into sub-nets.

TCP/IP (Transmission Control Protocol/Internet Protocol): A dual protocol consisting

of a transport-layer protocol (TCP) that divides data into packets which it

later reassembles, and a network protocol (IP) that handles transmission

of the packets between points in the network. It can be implemented on

different platforms, allowing data to be transmitted between machines

with different operating systems.

TKIP (Temporal Key Integrity Protocol): An encryption standard using dynamic

WPA-PSK keys that change periodically or after a specified amount of data have

been transmitted, making it more secure that WEP, which uses fixed keys.

UDP (User Datagram Protocol): A fast but unreliable transport layer

transmission protocol using the OSI model.

USB (Universal Serial Bus): A standard for connecting peripheral devices. USB

supports data transfer rates of up to 480 Mbps (USB 2.0). Devices

connected via USB can be connected and disconnected with the power

on (“hot plug”) and do not require separate IRQ (interrupt request)

numbers, preventing conflicts with other devices.

WAN (Wide Area Network): A network connecting computers or LANs in widely

separated locations. The Internet is an example of a WAN.

WEP (Wired Equivalent Privacy): A type of encryption in which the data

transmitted between devices is encoded using a shared encryption key

(WEP key).

Wireless LAN access point: A wireless transceiver that acts as the connection

between wireless devices and a wireless network.

WPA-PSK (WiFi Protected Access with Pre-Shared Key): A type of authentication for

wireless networks using previously-established (pre-shared) TKIP or AES

keys. Wireless devices using this form of authentication can only

communicate with devices with the same pre-shared key.

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Nikon WT-4 Bedienungsanleitung Seite 184