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Appendix E: Glossary
IPSec
E-16
Psion Teklogix 9160 G2 Wireless Gateway User Manual
A Static IP Address is an IP address that is hard-wired for a specific host. A static
address is usually required for any host that is running a server, for example, a Web
server.
IPSec
IP Security (IPSec) is a set of protocols to support the secure exchange of packets at
the IP layer. It uses shared public keys. There are two encryption modes: Transport
and Tunnel.
• Transport mode encrypts only the data portion (payload) of each packet,
but leaves the headers untouched.
• The more secure Tunnel mode encrypts both the header and the payload.
ISP
An Internet Service Provider (ISP) is a company that provides access to the Internet
to individuals and companies. It may provide related services such as virtual
hosting, network consulting, Web design, etc.
J
Jitter
Jitter is the difference between the latency (or delay) in packet transmission from
one node to another across a network. If packets are not transmitted at a consistent
rate (including Latency), QoS for some types of data can be affected. For example,
inconsistent transmission rates can cause distortion in VoIP and streaming media.
QoS is designed to reduce jitter along with other factors that can impact network
performance.
L
Latency
Latency, also known as delay, is the amount of time it takes to transmit a Packet
from sender to receiver. Latency can occur when data is transmitted from the access
point to a client and vice versa. It can also occur when data is transmitted from