
Duet2 D2600 / Duet3 D2650 Installation Manual – EU-D2600-D2650-INST/A10/v1 - 31
APPENDIX 6
Glossary of Terms (cont’d)
DTMF Fast Format Alarms Reporting Protocol
A protocol that is a sequence of analogue tones (push-button telephone
tones) used to send via telephone lines a transmission to receiving
equipment at an ARC, and to receive checking and acknowledgement
replies from that receiving equipment. 8 or 16 channel DTMF Fast
Format protocol is commonly used in burglar or intruder alarm
equipment.
Dualcom96 Alarms Reporting Protocol
This protocol is used by Duet to send transmissions to receiving
equipment at an ARC, and to receive checking and acknowledgement
replies from that receiving equipment. This is a modem type protocol.
EEPROM Electrically Erasable Programmable Read Only Memory
A type of NVM. See NVM.
GSM Global System for Mobile Communications
Digital telephone service particularly (but not exclusively) for users that
may be mobile for carrying digital data, speech or fax, where the path
from the user is by a radio link to one (or more) fixed sites.
GPRS General Packet Radio System
A digital telephone service for users that may be mobile for carrying
digital data (typically internet) where the path from the user is by a radio
link to one or more fixed sites.
Hybrid Line
A line that carries digital data and analogue signals simultaneously. Most
commonly this is an ADSL digital service and an analogue telephone
service on one line from a Service Provider to a subscriber.
NTP Network Termination Point
A telephone line is terminated at the users premises by a Network
Termination Point which is provided by the Telecoms Service Provider.
This is a socket or connection where the user’s equipment can be
connected.
NVM Non Volatile Memory
An integrated circuit memory device that does not need any power to
remember data.
PABX Private Automatic Branch Exchange
A small telephone exchange for use within one building or group of
buildings. Commonly used in businesses where each phone in that
business is an extension 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
Analogue PSTN.
SMS The GSM 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 Duet ) 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 minutes or more may be experienced during busy periods.
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