ICP DAS USA VERION 1.0 MSM-508FCS - Manual (Page 37)

Industrial Ethernet Layer 2 Managed Switch User Manual
TDRS4050601 b
Hub A device for local area networks (LANs) that is used to interconnect multiple
devices over an internal bus.
Jitter Aka. phase jitter, caused by power line harmonics and perceived in the form of
minor phase changes.
Multi-Drop Line Aka. Multipoint Line, a data link supporting multiple DTE connections, usually with
one DTE controlling the link by polling the other DTEs for input and addressing
output to the other DTEs. Utilizing frequency division or statistical MUX, a multipoint
line can support multiple independent point-to-point channels.
Multimode fiber An optical fiber that supports more than one propagating mode of light propagation.
Multiplexer Aka. or Multiplexor or Mux,. A device using several communications channels at the
same time, transmits and receives messages and controls communications lines,
may be a microprocessor.
Node A network-connected device, such as a server or PC.
Order Wire Voice channel used to communicate between two locations.
Packet A grouping of data, usually consisting of data and an address header prior to being
sent over a network.
Point-of Presence
(POP) The physical access location within a specific location of the long distance or
common carrier.
Polling The method used for terminal to controller communications. The controller
systematically asks for each terminal if it needs to transmit to the controller.
Protocol A set of rules for data communication. All devices communicating together must
adhere to the same rules.
Router Similar to a bridge but provides more complex and flexible networking support. It
usually also supports WANs.
Single mode fiber An optical fiber that supports only one mode of light propagation above the cutoff
wavelength.
Star Network in which all terminals are connected through a single point or node, such
as a star coupler.
Synchronous
Transmission Having a constant time interval between successive bits of data or information.
Time Division
Multiplexing A type of multiplexer that allocates a defined amount of backbone bandwidth for
each connected device.
Time Slot Unit of backbone bandwidth allocated for each port.
Token Ring A LAN topology where a control packet or token is passed from station to station in
sequential order. The stations wishing to access must wait for the token before
transmitting data, in the token ring the next logical station is also the next physical
station.
Virtual Path A software-controlled point-to-point connection between two devices or segments.