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DSP-4000 Series
Users Manual
C-2
Attenuation
A reduction in the strength of a signal. Attenuation is usually expressed in decibels.
Auto-Negotiation
The ability of a network device to determine the capabilities of a far end device, then select
settings for optimal communication.
Balun
An impedance-matching transformer used to transfer signals between coaxial and twisted
pair cable. Baluns are often used to connect IBM 3270 terminals to twisted pair cable, or to
connect coaxial Ethernet to UTP.
Bandwidth
A measure of the information capacity of a transmission medium. In analog
communications, bandwidth is expressed in hertz (Hz) as the difference between the
highest and lowest frequencies that the medium will pass without significant attenuation.
In digital communications, bandwidth is measured in bits per second.
Baseband Signaling
A method of signal transmission where the entire bandwidth of the medium is used to send
a single signal. The digital signal is applied, without modulation, directly to the
transmission media. Ethernet is a baseband network. Compare with broadband signaling.
Basic Link
A network connection consisting of (1) a test equipment patch cable to a patch panel, (2)
one connection at the patch panel, (3) a horizontal cable segment up to 90m (295 ft), (4) a
telecommunications outlet or transition connector, and (5) a test equipment patch cable
from the outlet or transition connector. Cable test limits for a link are tighter than those for
a channel because the channel limits allow for additional connections at the horizontal
cross-connect and near the telecommunications outlet. The basic link is defined in TSB-67.
Baud Rate
A measure of data transmission speed. Baud rate is the number of times per second that a
signal changes states. If only one bit is encoded in each signal change, baud rate is the
same as bits per second. If more than one bit is encoded in each change, the baud rate is
lower than the bits per second rate.
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