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Glossary
GL-2
Cisco 811 and Cisco 813 Routers Hardware Installation Guide
78-10188-03
D
DRAM
Dynamic RAM that stores information in capacitors that must be refreshed
periodically.
DSU
Data service unit. Device used in digital transmission that adapts the physical
interface on a data terminal equipment (DTE) device to a transmission facility
such as T1 or E1. The DSU is also responsible for such functions as signal
timing.
E
EMI
Electromagnetic interference. The interference by electromagnetic signals that
can cause reduced data integrity and increased error rates on transmission
channels.
ESD
Electrostatic discharge. A transfer of electrostatic charge between bodies of
different electrostatic potentials, such as an operator and a piece of electrical
equipment. ESD occurs when electronic components are improperly handled
and can damage equipment and impair electrical circuitry. ESD is more likely to
occur with the combination of synthetic fibers and dry atmosphere.
F
Flash memory
The nonvolatile storage that can be electrically erased and reprogrammed so that
data can be stored, booted, and rewritten as necessary.
I
ISDN
Integrated Services Digital Network. A communication protocol that permits
telephone networks to carry data, voice, and other source traffic.