CSL GradeShift User Manual

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PABX (Private Automatic Branch Exchange)
A PABX is a telephone exchange in one business or building (where a dial 9 is
needed for an outside line). It connects to one or more outside telephone lines
and has two or more extentions within the business or building. See Fig 17.
DualCom may be connected to one of the outside telephone lines where they
are the analogue PSTN type.
The extentions within the building may be analogue or digital. Where an extention
is analogue, a normal phone or fax machine may be connected. DualCom
may be connected here. See Fig 18.
Where the PABX is mains powered and it is not battery backed-up then the
extention line to the DualCom may fail in the event of a mains failure. This may
make this type of telephone connection unsuitable for DualCom.
Where the extention is a digital line then a special ‘feature phone’ is usually
required, provided by the manufacturer of the PABX equipment. DualCom can
not be directly connected to any type of digital telephone line.
PABX with connection to Analogue PSTN Line
Fig 17

CSL GradeShift Specifications

General

Brand	CSL
Model	GradeShift
Category	Security System
Language	English