HP auroraTempo User Manual page 271

An exchange that switches digital signals by means of
Digital
digital switching.
Exchange
Data Link Connection Identifier. This is the number of the
DLCI
virtual circuit, contained in the Frame Relay Header. This
field can be extended using the EA (Extended Address).
Data Service Unit. This is switching equipment which
DSU
connects customer equipment, for example a PC or
workstation to the Customer Service Unit.
Data Terminal Equipment. This is end user equipment such as
DTE
a PC, mainframe or workstation.
A 2.048 Mbps circuit.
E1
A 34.368 Mbps circuit.
E3
Extended Address bits in the Frame Relay Header allow for
EA
additional DLCI addressing.
In telecommunications, this is when a transmitted signal is
Echo
reflected back to the sender.
Signalling method in which signals pass right through from
End to End
end to end without processing within intermediate nodes.
Extended Frame Format.
ESF
ETSI stands for 'European Telecom Standards Institute',
ETSI
which is the standards making authority for Europe. The ITU
Q921 and Q931 recommendations are commonly referred to
as the ETSI protocol.
This is the maximum number of bits by which the user may
Excess Burst
exceed the Committed Burst Size, within a given time
Size (Be)
period.
Issue 1a - 10/99
Appendix 4 - Glossary
A4 - 5