Glossary
GL-2
Cisco 806 Router Hardware Installation Guide
78-10432-01
D
DRAM
Dynamic random-access memory (RAM). RAM that stores information in
capacitors which must be periodically refreshed.
DSL
Digital Subscriber Line. Public network technology that delivers high bandwidth
over conventional copper wiring at limited distances. There are four types of
DSL: ADSL, HDSL, SDSL, and VDSL. All are provisioned via modem pairs,
with one modem at the central office, and the other located at the subscriber site.
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.
ESD 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 from, and rewritten as necessary.