APPENDIX 6
Glossary of Terms (continued)
ISDN Integrated Services Digital Network
A digital communication network where services are provided via electrical
or optical cables. This may also be a digital PSTN. The network is usually
provided as a 2 channel or 30 channel ISDN service.
LAN Local Area Network
A digital communication network within buildings where services are pro-
vided via wired electrical or optical cables, or by radio (WiFi). Normally used
for communications between computers, servers & routers.
NTP Network Termination Point
A telephone line is terminated at the users premises by a Network Termina-
tion Point which is provided by the Telecomms Service Provider. This is a
socket or connection where the users equipment can be connected. The
NTP is the responsibility of the Telecomms Service Provider.
NVM Non Volatile Memory.
An integrated circuit memory device that does not need any power to re-
member data.
PABX Private Automatic Branch Exchange
A small telephone exchange for use within one building or group of build-
ings. Commonly used in businesses where each phone in that business is
an extention on that PABX. Usually connects to one or more analogue PSTN
or ISDN telephone lines.
PSTN Public Switched Telephone Network.
A national telephone system. This may be analogue and/or digital. See
Analog PSTN.
SMS Short Message Service.
Service provided by companies supplying a GSM communications system
where a short text message may be sent to (and from) GSM mobile phones
and read on the GSM mobile phone display.
SMS Message Centre
SMS messages are not sent ‘directly’ from one GSM phone (or DualCom)
to another GSM phone. All messages are first sent to a Message Centre
operated by the GSM Network Provider and then forwarded to the selected
mobile phone(s). This normally takes a few seconds but delays of 30 min-
utes or more may be experienced during busy periods.
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