Weidmuller WI-MOD-945-E: 900Mhz Wireless Ethernet & Device Server v2.16 - Manual (Page 104)

Weidmuller Technologies Wireless Ethernet Modem & Device Server 945U-E User Manual
Page 104 www.weidmuller.com Rev 2.136
proxy server is able to prevent direct communication between two or more networks. The
proxy server forwards allowable data requests to remote servers and/or responds to data
requests directly from stored remote server data.
RJ-45 Standard connectors used in Ethernet networks. RJ-45 connectors are similar to standard
RJ-11 telephone connectors, but RJ-45 connectors can have up to eight wires, whereas
telephone connectors have four.
Server A computer that provides its resources to other computers and devices on a network.
These include print servers, Internet servers and data servers. A server can also be
combined with a hub or router.
Site survey
The process whereby a wireless network installer inspects a location prior to installing a
wireless network. Site surveys are used to identify the radio- and client-use properties of a
facility so that access points can be optimally placed.
SSL Secure Sockets Layer. A commonly used encryption scheme used by many online retail
and banking sites to protect the financial integrity of transactions. When an SSL session
begins, the server sends its public key to the browser. The browser then sends a randomly
generated secret key back to the server in order to have a secret key exchange for that
session
Sub network
or Subnet
Found in larger networks, these smaller networks are used to simplify addressing between
numerous computers. Subnets connect together through a router.
Switch A type of hub that efficiently controls the way multiple devices use the same network so
that each can operate at optimal performance. A switch acts as a networks traffic cop:
rather than transmitting all the packets it receives to all ports as a hub does, a switch
transmits packets to only the receiving port.
TCP Transmission Control Protocol. A protocol used along with the Internet Protocol (IP) to
send data in the form of individual units (called packets) between computers over the
Internet. While IP takes care of handling the actual delivery of the data, TCP takes care of
keeping track of the packets that a message is divided into for efficient routing through the
Internet. For example, when a web page is downloaded from a web server, the TCP
program layer in that server divides the file into packets, numbers the packets, and then
forwards them individually to the IP program layer. Although each packet has the same
destination IP address, it may get routed differently through the network. At the other end,
TCP reassembles the individual packets and waits until they have all arrived to forward
them as single message.
TCP/IP The underlying technology behind the Internet and communications between computers in
a network. The first part, TCP, is the transport part, which matches the size of the
messages on either end and guarantees that the correct message has been received. The
IP part is the user's computer address on a network. Every computer in a TCP/IP network
has its own IP address that is either dynamically assigned at startup or permanently
assigned. All TCP/IP messages contain the address of the destination network as well as
the address of the destination station. This enables TCP/IP messages to be transmitted to
multiple networks (subnets) within an organization or worldwide.
VoIP Voice Over Internet Protocol. Voice transmission using Internet Protocol to create digital
packets distributed over the Internet. VoIP can be less expensive than voice transmission
using standard analog packets over POTS (Plain Old Telephone Service).
VPN Virtual Private Network. A type of technology designed to increase the security of
information transferred over the Internet. VPN can work with either wired or wireless
networks, as well as with dial-up connections over POTS. VPN creates a private
encrypted tunnel from the end user's computer, through the local wireless network,
through the Internet, all the way to the corporate servers and database.