Industrial Redundant Ring Switch
– RS Series User Manual
Appendix A
Glossaries
ANSI X3T9
Commonly referred to as FDDI. A local area network protocol that
operates at 100Mbps.
Asynchronous
Having a variable time interval between successive data or
information in the form of characters, operations, events.
Transmission in which the data or information is individually
synchronized or timed usually by start and stop bits (S/S).
Attenuation
A general term describing the loss of power between two points,
measured in decibels per kilometer (dB/km) at a specified wavelength
(nm).
Backbone
Network
A main or high speed transmission facility or medium usually designed
to connect lower speed channels or clusters of terminals. May
describe common carrier main transmission path.
Bandwidth
A range of frequencies available for signaling; the differences between
the highest and lowest frequencies of a band are expressed in (Hz).
Bridge
A device used to connect two separate LANs or used to divide a large
LAN into smaller LANs. Each LAN acts as its own LAN, but uses a
bridge device to communicate from one LAN to another.
Bus
Path or channel, usually electrical, with one or more conductors,
where all devices are able to receive all transmissions at the same
time.
Counter-Rotating
Ring
Aka. Self-Healing Ring; has two physical transmission lines or rings
with transmitting and receiving signals in each ring travelling in
opposite directions. If the line or a device along the ring fails, the ring
re-anneals by bypassing the device and or line and forms with the
other ring to form a new single ring.
Crosstalk
The unwanted transfer of energy from the disturbing circuit to another
called the disturbed circuit. Usually from an adjacent analog channel.
Dispersion
The spreading of light pulses that takes place in multimode fiber optic
transmission. Dispersion limits the potential transmission distance
because the spread out light pulses reach the destination at different
times making the signal unreadable.
Ethernet
Product name for one of the first popular LAN technologies, later
standardized as IEEE 802.3.
Fiber Optic Cable
Thin filaments of glass or other transparent material sheathed in an
insulator through which a light beam may be transmitted for long
distances by means of multiple internal reflections. A waveguide used
to transmit digital information.
Flow Control
A method for a receiver to control the information flow from a
transmitter. It eliminates data overflow at the receiver.
a
TDRS4050601
