1.
GENERAL DESCRIPTION
The Minimaster
1
is a mains powered microprocessor controlled switching system of
1 + 6
capacity. The system comprises a wall mounted Central Control Unit (CCU) with one line, which
may be connected as either a direct exchange line or as an extension off a PBX, and up to six
two wire telephones. When connected as a PBX extension only earth loop recall may be used.
The CCU
(see
fig.
2)
measures approximately
300
mm high,
200
mm wide and
75
mm
deep and weighs
2.5
kg. The CCU contains:
a.
the principal circuit board which carries all the ciruitry and
terminal blocks for a system with one line and three extensions;
b.
the expansion board which carries circuitry and terminal blocks for three
additional extensions;
c.
the power unit which is connected to a
3
metre long mains cable with mains
plug fused at
3
amps.
The telephones which are star connected to the CCU may be any standard telephone
using loop/disconnect pulsing. Difficulty may be experienced in obtaining a satisfactory operation
of the tone caller of "Sceptre" telephones and Statesman telephones may cause "wrong
number" problems on "divert", consequently these telephones should not be used with
Minimaster systems. A recall button giving earth loop recall may be required for PBX working.
B::ittery powered Keyphones e.g. X-Press Callmaker, require Power Unit charging arrangements.
LOGO BUTTON
DISPLACED
COVER FIXING
SCREW
FIG 1
MINIMASTER
1
CENTRAL CONTROL UNIT
1.
