G l o s s a r y
69
KTS
Key telephone system. A system which uses
it’s own system telephones, often with extra
functions. This unit is a hybrid telephone
system, capable of supporting both ordinary
SLT and Terminal phones.
MSN
See Multiple subscriber number.
Multiple subscriber number (MSN)
An ISDN basic rate access can have many
numbers assigned to it. This is called multi-
subscriber numbering. Another version is
DDI, which is treated exactly the same in the
system. The numbers are used to address the
connected terminals.
NT / NTBA
Network Termination Basic Access. This is a
device which adapts a two- wire system to a
four- wire connection to the ISDN S0
interface.
Personal identification number (PIN)
You need the personal identification number
(PIN) to program the system. This should be
changed to a safe, easy to remember number.
PSTN
Public Switched Trunk Network. This is the
name given to the analogue telephone
network, compare with ISDN, the digital
network.
Recall
See flash.
RTC
Real time clock. This is the clock inside the
system which is backed up by battery and will
not lose the time if power is lost and the
BBU runs out of charge.
Serial Port
See V.24
SLT
Single line telephone. This is an ordinary
telephone which can be connected to the
network on it’s own.
SMDR
Station message detail recording. This the
ability to log all calls made by the system for
accounting purposes. The system uses a
system called CDR, or call detail recording.
Terminal
A terminal refers to different devices
depending on the context. In the case of this
telephone system the Terminals are the
system phones connected to it, the Executive
Terminal and Standard Terminal.
V.24
Technical name of the internationally
standardised serial data interface as also
found on PCs. Also referred to as a serial
port or an RS232 interface.
