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20614 Cisco Installing and Maintaining Routers Part 4: 12000 GSR Series and XS5032 Modules

dynamic random−access memory. RAM that stores in capacitors that must be periodically refreshed.

DSU

Data Service Unit. Device used in digital transmission that adapts the physical interface on a DTE device to a

transmission facility such as T1 or E1. The DSU is also responsible for such functions as signal timing. Often

referred to together with CSU, as CSU/DSU.

DTE

data terminal equipment.

Dynamic Random−Access Memory (DRAM)

dynamic random−access memory. RAM that stores information in capacitors that must be periodically

refreshed. Delays can occur because DRAMs are inaccessible to the processor when refreshing their contents.

However, DRAMs are less complex and have greater capacity than SRAMs.

EDO

Extended data output

Electrically Erasable Programmable Read−Only Memory (EEPROM)

electrically erasable programmable read−only memory. EPROM that can be erased using electrical signals

applied to specific pins. See also EPROM.

EMI

Electromagnetic interference

EPROM

erasable programmable read−only memory

ESD

Electrostatic discharge. The rapid discharge of static electricity from one conductor to another of a different

potential.

Extended Industry−Standard Architecture (EISA)

Extended Industry−Standard Architecture. 32−bit bus interface used in PCs, PC−based servers, and some

UNIX workstations and servers.

FDDI

Fiber Distributed Data Interface. LAN standard, defined by ANSI X3T9.5, specifying a 100−Mbps

token−passing network using fiber−optic cable, with transmission distances of up to 2 km. FDDI uses a

dual−ring architecture to provide redundancy.