Cisco 10008 Hardware Installation Manual page 155

See ESR.
Edge Services
Router
See EMI.
Electromagnetic
interference
See ESD.
Electrostatic
discharge
Electromagnetic interference. Interference by electromagnetic signals that can cause reduced data
EMI
integrity and increased error rates on transmission channels.
Electromagnetic pulse. Caused by lightning and other high-energy phenomena. Capable of coupling
EMP
enough energy into unshielded conductors to destroy electronic devices.
Electrostatic discharge. Discharge of stored static electricity that can damage electronic equipment and
ESD
impair electrical circuitry, resulting in complete or intermittent failures.
Edge Services Router. A router that aggregates and routes traffic from thousands of low- and
ESR
medium-bandwidth subscriber connections Into a few high-bandwidth connections to the Internet core.
Baseband LAN specification. Ethernet networks use CSMA/CD and run over a variety of cable types
Ethernet
at 10 Mbps, 100 Mbps, and 1000 Mbps. Ethernet is similar to the IEEE 802.3 series of standards. See
also
F
Any of a number of 100-Mbps Ethernet specifications. Fast Ethernet offers a speed increase 10 times
Fast Ethernet
that of the 10BaseT Ethernet specification, while preserving qualities such as frame format, MAC
mechanisms, and MTU. Existing 10BaseT applications and network management tools can be used on
Fast Ethernet networks. The Fast Ethernet specification is based on an extension to the IEEE 802.3
specification. Compare with
Physical medium capable of conducting modulated light transmission. Compared with other
Fiber-optic cable
transmission media, fiber-optic cable is more expensive, but it is not susceptible to electromagnetic
interference and is capable of higher data rates. Sometimes called optical fiber.
See FRU.
Field-replaceable
unit
Nonvolatile storage that can be electrically erased and reprogrammed so that software images can be
Flash memory
stored, booted, and rewritten as necessary. Flash memory was developed by Intel and is licensed to
other semiconductor companies.
Frame Relay Industry-standard, switched data link layer protocol that handles multiple virtual circuits using HDLC
encapsulation between connected devices. Frame Relay is more efficient than X.25, the protocol for
which it is generally considered a replacement.
Field replaceable unit. A component that can be removed from a network device and replaced in the
FRU
field. Line cards, power modules, and fan modules are typically FRUs.
OL-0659-13
Fast Ethernet, Gigabit Ethernet,
Ethernet
IEEE 802.3.
and Gigabit Ethernet. See also
Cisco 10008 Router Hardware Installation Guide
Glossary
100BaseT and IEEE 802.3.
GL-5