Issue 2 - 07/00 A4-5
Appendix 4—Glossary & Abbreviations
DPNSS Digital Private Network Signalling System. A UK signalling
standard for use between PABXs in a private network.
EAZ The subscriber number for a line using 1TR6 consists of a
fixed part which is common to the line and a digit which
identifies the terminal—this is the EAZ. The abbreviation
comes from the German word for ‘end equipment
selection number’. Sometimes called a 1TR6 ‘sub-address’.
Echo In telecommunications, this is when a transmitted signal is
reflected back to the sender.
EMC Electro-magnetic Compatibility.
En Bloc A type of dialling where the digits are assembled and then
sent in a single call control packet.
Encoding The process of coding information into a form suitable for
transmission.
End to End Signalling method in which signals pass right through from
end to end without processing within intermediate nodes.
EOC Embedded Operations Channel. Used to send commands
from the switch to the NT, to perform activities such as a
loopback within the NT.
ES Errored Second. A second in which one or more BERT
errors are measured in a single direction of transmission.
ETSI The European Telecommunication Standards Institute,
which is the standards making authority for Europe. The
ETSI protocol is the standard European protocol.
FAS Frame Alignment Signal. This is used in the alignment of
digital transmission frames on a Primary Rate link.
Filter A device for removing unwanted information.
Fixed Link A type of ISDN point-to-point link which does not use
protocol transactions to establish a clear channel.
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