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122 IQ Probe User Manual 61200214L1-1
Glossary
bit
A binary digit. A signal, wave, or state is represented as either a binary 0 or 1.
bits per second (bps)
The number of bits passing a specific point per second. Examples of common
rates are:
• A Kilobit is one thousand bits per second (kbps)
• A Megabit is one million bits per second (Mbps)
bridge
A device that supports LAN-to-LAN communications. Bridges may be equipped
to provide frame relay support to the LAN devices they serve. A frame relay
capable bridge encapsulates LAN frames in frame relay frames and feeds them to
a frame relay switch for transmission across the network. A frame relay capable
bridge also receives frame relay frames from the network, strips the frame relay
frame off each LAN frame, and passes the LAN frame on to the end device.
Bridges are generally used to connect LAN segments to other LAN segments or
to a WAN. They route traffic on the level 2 LAN protocol (e.g. the Media Access
Control address), which occupies the lower sub-layer of the LAN OSI data link
layer. See also router.
byte
Generally, an 8-bit quantity of information, used mainly in referring to parallel
data transfer, semiconductor capacity, and data storage. Also, it is generally
referred to in data communications as an octet or character.
carrier
The provider of the data service to the customer site. Carriers can be local
telephone companies, regional telephone companies or any inter-exchange
carrier such as AT&T, Sprint, or MCI.
CD
carrier detect. A signal generated by a modem or DSU/CSU. CD indicates the
presence of a carrier signal on a communications link.
channel bank
Equipment in a telephone central office or customer premises that performs
multiplexing of lower speed digital channels into a higher speed composite
channel. The channel bank also detects and transmits signalling information for
each channel; thereby transmitting framing information so that time slots
allocated to each channel can be identified by the receiver.