9 Glossary
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9
Glossary
A
Asynchronizatio
n
Asynchronization does not use the exact data signals timed by the
clock. The signals have different frequencies and phases. The
asynchronizatioin usually encapsulates the bits into the control flag,
which specifies the beginning and end of the bits.
D
DCE
Data Circuit-terminating Equipment is a network device composing the
UNI. DCE provides the physical connection to the network, forwards
the data, and provides the clock signals for the DTE.
DRAM
Dynamic Random Access Memory. The information stored in the RAM
must be refreshed periodically. When the contents of the DRAM are
being refreshed, a user cannot access it. Delay can thus occur.
DTE
Data terminal equipment is a user device composing the UNI. The DTE
accesses the data network through the DCE equipment (for example,
model) and usually uses the clock signals produced by DCE.
E
EMC
Electro magnetic compatibility is the condition which prevails when
telecommunications equipment is performing its individually designed
function in a common electromagnetic environment without causing or
suffering unacceptable degradation due to unintentional
electromagnetic interference to or from other equipment in the same
environment.
F
Flash
Flash is a kind of special Erasable Programmable Read Only Memory
(EEPROM), which can be completely erased and rewritten one time
instead of only one byte.
