User manual
72 www.cooperbussmann.com/wirelessresources
Cooper Bussmann 615M-1 Cellular Data Modem and IP Router Series Manual
Rev Version 1.0
Term Definition
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 indi-
vidually 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 indi-
vidual 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 des-
tination station. This enables TCP/IP messages to be transmitted to multiple networks (sub-
nets) within an organization or worldwide.
TFTP
Trivial File Transfer Protocol (TFTP) is a file transfer protocol notable for its simplicity. It is
generally used for automated transfer of configuration or boot files between machines in a
local environment.
UDP
The User Datagram Protocol (UDP) is one of the core members of the Internet protocol suite,
the set of network protocols used for the Internet. With UDP, computer applications can send
messages, in this case referred to as datagrams, to other hosts on an Internet Protocol (IP)
network without prior communications to set up special transmission channels or data paths.
UMTS
The Universal Mobile Telecommunications System (UMTS) is a third generation mobile cellu-
lar system for networks based on the GSM standard.
UTC
Coordinated Universal Time (UTC) is the primary time standard by which the world regulates
clocks and time. It is one of several closely related successors to Greenwich Mean Time
(GMT). For most purposes, UTC is synonymous with GMT.
VPN
Virtual Private Network (VPN) is a type of technology designed to increase the security of
information transferred over the Internet. VPN can work with either wired or wireless net-
works, as well as with dial-up connections over POTS. VPN creates a private encrypted tun-
nel from the end user’s computer, through the local wireless network, through the Internet, all
the way to the corporate servers and database.
WAN
Wide Area Network. A communication system of connecting PCs and other computing
devices across a large local, regional, national or international geographic area. Also used to
distinguish between phone-based data networks and Wi-Fi. Phone networks are considered
WANs and Wi-Fi networks are considered Wireless Local Area Networks (WLANs).
Wi-Fi
Wireless Fidelity. An interoperability certification for wireless local area network (LAN) prod-
ucts based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard.