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Introduction
i.1
The
Figure
extensions. The
form and does not require any expansion hardware.
The
serving exchange). Internal switching of the extensions and exchange
lines is done by miniature sealed relays, so the
CCU is totally dependent on the signalling from the extension Telephone
or System phones.
Central Control Unit
i.i.1
The
unit housing the mains power unit, a single PCB on which is mounted
the main processor, facility software in PROM, two Peripheral
processors, and all switching relays and IDC connectors for the
extensions and exchange lines. No separate Network Terminating and
Test Point is required by the system. Break jacks are provided on the
exchange line IDCs.
Systemphone
i.i.2
The
operation, direct selection and display status of exchange lines and
extensions and a
The System phones require a
the moment they are plugged into the extension socket, before they can
be used.
Telephones
Ll.3
Approved Telephone extensions must be fitted with an earth recall
facility which is used for line access and hold. Telephones using Time
Break recall only are not suitable.
Modes of working
1.1.4
The
a PBX where incoming calls are routed to a controlling operator
extension or as a Keysystem where incoming calls can be answered by
any extension which is programmed to ring. In Keysystem mode the
can be set to a third option known as Exclusive line working where the
second exchange line can be dedicated to one extension user or to a
Facsimile machine. The
approved telephones.
TPU 1371Issue3(4/91)
2+8
is a microprocessor-controlled Hybrid Keysystem/PABX. See
It has an ultimate capacity for two exchange lines and eight
1.1.
is supplied complete as a
2+8
CCU is a
system (the CCU is virtually transparent to the
2+8
Y=O
Central Control Unit is completely self-contained in a single box
2+8
2+8
System phone is exclusive to the
10
number store.
is a Hybrid small switching system. This means it can be used as
2+8
2+8
system in its basic
2+8
2+8
2+8
system, having full LSr
10
second power up period, measured from
can also employ a mix of System phones and
signalling from the
2+8
Introduction
1-1
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