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Data Service Unit. Device used in digital transmission that adapts the physical interface on a DTE
DSU
device to a transmission facility such as T1 or E1. The DSU is also responsible for such functions as
signal timing. Often used with CSU, as in CSU/DSU.
Data terminal equipment. Device at the user end of a user-network interface that serves as a data
DTE
source, destination, or both. DTE connects to a data network through a DCE device (for example, a
modem) and typically uses clocking signals generated by the DCE. DTE includes devices such as
computers, protocol translators, and multiplexers.
E
Electronic Industries Alliance.
EIA
Electromagnetic interference.
EMI
Erasable programmable read-only memory.
EPROM
Electrostatic discharge.
ESD
European Data-over-Cable Service Interface Specifications.
EuroDOCSIS
F
Any of a number of 100-Mbps Ethernet specifications. Fast Ethernet offers a speed increase 10 times
Fast Ethernet
that of the 10Base-T Ethernet specification, while preserving qualities such as frame format, MAC
mechanisms, and MTU. Existing 10Base-T 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.
Forward error correction.
FEC
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
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.
G
Global positioning system.
GPS
H
Protocol that supports VoIP.
H.323 VoIP network
OL-17309-01
Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide
Glossary
GL-3
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Troubleshooting
