Appendix B: Glossary
concentrator
A device that provides attachment points for stations that are not connected to the FN10. The concentrator is connected directly to the network; the stations connect to the concentrator.
congestion
A condition where a portion of the network is overloaded with more data than can be transmitted in the desired time period.
CSMA/CD
A channel access (contention) method that requires each station to wait for an idle channel before transmitting. In addition, stations are able to detect overlapping transmissions (collisions) and retransmit in the event of a data collision.
data link layer
Layer 2 in the OSI model. Defines frame construction, addressing, error detection, and other services to higher layers.
datagram
Abbreviated and connectionless
data rate (or speed)
The maximum number of bits of information that can be transmitted per second.
destination address filtering
A process that discards (filters) traffic based on MAC destination addresses.
downstream
Refers to the relative position of a station in a network to another station in the same network. A station is downstream from another station if it receives data after the other station receives data.
dynamic address
An address “learned” by the FN10, as opposed to addresses that are manually entered into the Bridge Address Table. The FN10 “learns” addresses by reading them from the data packets it processes.
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