GEC
REX 80-E

REX 80-E is an extensible PABX which uses a reed-relay switching matrix with electronic common control.

Up to 140 junctions (each of which can be allocated to public-exchange or tie lines as desired) and 1000 extensions may be provided, although REX 80-E may be installed with as few as 25 junctions and 150 extensions and later extended, as the need arises, by the addition of equipment racks and switchboards via plug and socket connections.  A useful range of features is included as standard, and many optional facilities are available to enable the system to be tailored to suit the requirements of individual customers.

The REX 80-E package incorporates an attractive desk-top switchboard with separate cabinets for the switching equipment.  The cabinets contain their own mains-derived power supply units and are provided with locking lift off covers.

The simplicity of the system and the long life of the reed relays and solid-state components combine to make the PABX inherently reliable.

Easy maintenance is ensured by the provision of a fault printer and by the use of plug-in units and plug and socket rack interconnections.

STANDARD FEATURES
Outward calls either direct outward dialling (DOD) or where permitted via the switchboard operator.
Operator's switchboard with: Cordless operation.
Pushbutton dialling.
Call-progress indication.
Call split.
Camp on.
Trunk offer.
Demand working.
Calling line identification.
Calls waiting indicator.
State of exchange display.
Automatic inter-extension dialling.
Pushbutton or dial phones no exchange alteration.
Incoming calls via the operator.
Distinctive ringing for external calls.
Enquiry and transfer.
Automatic first party release.
Operator recall.
Night service with full PABX facilities.
Mains-fail switching.
13 extension classes of service.
Ring back when free.

OPTIONAL FEATURES
Staff location access.
Dictation access.
Group hunting.
Immediate ring.
Three way conference on exchange line calls.
Executive right-of-way (EROW).
Direct outward dialling (DOD) restriction for any number of extensions according to class-of-service allocation.
Named keycalling.
Tie lines.
Watchman's service.
Public address coupling.
Extension metering.
Step conference.
Direct dialling in.
Short code dialling.
Non busy emergency number.
Absent extension transfer.
Fire alarm access.

Switching equipment
Reed-relay matrices with electronic, solid-state control.

Capacity

*Additional racks may be provided at any stage of system growth to cater for special requirements.

1977