GEC PAX 25

25 line
private automatic exchange

STANDARD FEATURES
Maximum capacity
25 extension lines.

Connect circuits
Provision for 4 simultaneous conversations.

Numbering scheme
21 to 45.

Executive's priority
Selected executives can have a priority-button telephone* enabling them to break into an existing conversation.

OPTIONAL FEATURES
Tie lines*
Up to 4.

Conference*
Up to 1 0 extensions can be connected together via a special circuit.

Fire alarm*
Various procedures are available to suit individual requirements and local fire regulations.

Staff location*
Staff absent from their offices may be called by dialling a special locating number and a personal code, to operate lamps or bells.

Secretary service*
A secretarial switching telephone enables secretaries to filter calls to an executive.

Public exchange lines*
Up to 4 by adding special attendant's cabinet.

GENERAL
Mode of operation
Fully automatic operation using uniselectors and relays.  All conversations secret from each other.

Tones and ringing
Electronic tone generators provide dial tone, ring tone and current, and busy tone.

Signalling
Required dial-pulse characteristics: 7 to 14 i.p.s., 2:1 break to make ratio.

Alarms
Audible indication of blown fuse.

Power unit*
AC power unit: input, 100 to 120V or 200 to 250V 50 to 60 Hz single phase; output, 26V d.c., 3A.
or
Battery: 26v 32 AH ; with float charger, input as for a.c. power unit; output, 26V d.c. 3A.

Line loop resistance
Not to exceed 250 ohms.

Construction
Complete switching unit is table or wall mounted and contained in a lift-off dust cover painted dark green.  Wired-in equipment on a steel frame hinged to give full access for maintenance.

Dimensions and Weight

*To be specified when ordering

1968

GEC-AEI

Last revised: 18 November, 2000