Installation manual

APPENDIX 6
Glossary of Terms (continued)
ISDN 2 2 Channel ISDN
An ISDN communication service where two simultaneous channels may be
used. Each channel is normally a 64 KiloBit/sec serial data path. Each path
may typically carry one speech telephone call, or an internet connection or
a fax call.
ISDN 30 30 Channel ISDN
An ISDN communication service where thirty simultaneous channels may
be used. Each channel is normally a 64 KiloBit/sec serial data path. Each
path may typically carry one speech telephone call, or an internet connec-
tion or a fax call.
NTP Network Termination Point
A telephone line is terminated at the users premises by a Network Termination
Point which is provided by the Telecomms Service Provider. This is a socket or
connection where the users equipment can be connected.
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.
PAKNET Packet Network.
See VDN
PSTN Public Switched Telephone Network.
A national telephone system. This may be analogue and/or digital. See
Analog PSTN.
RSSI Reverse Signal Strength Indication
This is a value indicating the radio signal strength recieved at the base
station from a Dualcom.or VDN radio PAD.
Terminal Adapter
A Device that connects to the S-bus connection of an ISDN Network Termi-
nation Point and adapts the digital S-bus data, i.e.protocol, data speed,
structure, to that required. E.g. the conversion may be to analogue PSTN or
to a serial port for cable connection to a PC serial ‘COM’ port.
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