Glossary
GL-14
Cisco 6260 Hardware Installation Guide
OL-2365-02
encapsulation
The wrapping of data in a particular protocol header. For example, Ethernet data is wrapped in a
specific Ethernet header before network transit. Also, when bridging a dissimilar network, the entire
frame from one network is placed in the header used by the data link layer protocol of the other
network.
EPROM
Erasable programmable read-only memory. Nonvolatile memory chips that are programmed after they
are manufactured, and, if necessary, can be erased by some means and reprogrammed.
erasable
programmable
read-only memory
See
EPROM
.
error detection
A process used during file transfer to discover discrepancies between transmitted and received data.
Some file transfer programs only detect errors; others detect errors and attempt to fix them (called
error correction).
ESD
electrostatic discharge. Discharge of stored static electricity that can damage electronic equipment and
impair electrical circuitry, resulting in complete or intermittent failures.
ESF
Extended Superframe. A framing type that is used on T1 circuits that consists of 24 frames of 192 bits
each, with the 193rd bit providing timing and other functions.
Ethernet
One of the most common LAN wiring schemes, Ethernet has a transmission rate of 10 Mbps; a newer
standard called Fast Ethernet has a rate of 100 Mbps.
ETSI
European Telecommunications Standards Institute. ETSI is a non-profit organization producing
voluntary telecommunications standards used throughout Europe, some of which have been adopted
by the european community as the technical base for Directives or Regulations.
European
Telecommunication
s Standards
Institute
See
ETSI
.
event
Network message indicating operational irregularities in physical elements of a network or a response
to the occurrence of a significant task, typically the completion of a request for information. See also
alarm
and
trap
.
explicit forward
congestion
indication
See
EFCI
.
Extended
Superframe
See
ESF
.
F
fault management
One of five categories of network management defined by ISO for management of OSI networks. Fault
management attempts to ensure that network faults are detected and controlled. See also
accounting
management
,
configuration management
,
performance management
, and
security management
.