Honeywell HC900 Installation And User Manual page 38

Components and Architecture - Networking Basics Reference
Name/Acronym
Collision Simultaneous transmission
of two nodes on the same
channel.
Collision An indication to the Data
Detection Link Layer that node
contention (simultaneous
transmission) is present at
the Physical Layer.
Crosstalk Electrical noise coupled
between media elements
Cross-over Cable Ethernet cable that enables
connection of DCE to DCE
equipment, or DTE to DTE
equipment.
CSMA/CD
Carrier Sense Multiple
Access w/ Collision
Detection
CSU/DSU Channel Service Unit/Data
Service Unit
Cut-Through Method used by switches
for filtering messages, based
on the first few bytes.
Data Link A logical connection
between two nodes on a
network.
Data Link Layer Layer 2 of the OSI Model
that is media-independent,
and functions above Layer 1
(Physical Layer).
Datagram A series of bits in an
ordered, intelligible
sequence.
DCE
Data Communications
Equipment
DHCP
Dynamic Host
Configuration Protocol
DNS Domain Name System
Domain On the Internet, a named
network.
In MS Windows, an
elemental administrative
(security-oriented) unit.
28
Name/Definition
HC900 Hybrid Controller Installation and User Guide
Comments
Collisions can be reduced (and network capacity
increased) by use of Switches, which partition and
isolate collision domains.
Collision Detection causes both nodes to abort
transmission, set a random delay, and attempt re-
transmission. If contention recurs, each device
doubles delay time before re-transmission;
successive redoubling is called "exponential back-
off".
In a "cross-over" cable, wiring crosses over from
the Transmit connection pair at one end to Receive
connection pair at the other end.
All nodes on the same network are free to initiate
message transmission. If two nodes transmit
simultaneously, the collision is detected, and both
nodes abort transmission and attempt to re-transmit
after a pause.
Converts data from format used by telephone
company to format usable on LAN.
Enhances transmission speed, but reduces
transmission security and/or reliability.
Defines protocols for data packets and how they
are transmitted between networking devices.
Includes two sublayers: Media Access Control
(MAC), and Logical-Link Control (LLC).
Datagrams are commonly referred to as "Packets",
because they are data entities, although Packets
apply only the top layer (Application Layer of the
OSI Model.
Devices that transport data between DTE devices.
Runs in a DHCP server, which assigns an IP
address to each node that connects to the network.
(Can not be used in a an HC900 LAN.)
An Internet system (resident in a Web Browser)
that resolves domain names to IP addresses. (For
example, Http://www.yahoo.com resolves to
Http://204.71.202.160.)
User Names/Passwords, and related data on a
network.
Revision 5
9/03