Summary of Contents for British Telecommunications (BT) MINIMASTER 1
- Page 1 0018 GUIDE NOTES (CUSTOMERS APPARATUS) NOT TO BE SHOWN OUTSIDE BRITISH TELECOM MINIMASTER (1+6) SMALL ELECTRONIC SWITCHING SYSTEM FOR HOME OR OFFICE T R AI N I N G & EDUCATIO N British DIVISIO N TEL.ECO�·\ 1 NOV. 1982 IDHQ/IT5.1.2 ISSUE...
- Page 3 MINIMASTER ( 1+6) These guide notes have been designed to assist Field Staff with the installation and maintenance of Minimaster 1. To gain maximum benefit from them they should be read completely, by both Installation and Maintenance staff. Page Contents...
- Page 5 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.
- Page 6 COVER FIXING SCREW MAINS CABLE TERMINAL BLOCK COVER FUSE HOLDER (500 ma anti-surge fuse) (Fuse 36A/0.5) Ql b Ql e PRINCIPAL CIRCUIT BOARD Exchange Line Extension 3 0 0 d Extension 2 0 0 c Extension 6 (]) 0 b 0 0a 0 0 d Extension 1...
- Page 7 INSTALLATION & Installing the CCU. Do not connect the mains supply to the CCU until all wiring cabling is completed. First remove the cover by prising out the central BT logo button using a (see fig. Screwdriver Instrument No. loosen the cover fixing screw and lift the cover clear, The CCU should be screwed to a suitable wall surface using the three fixing holes in Fig 3 the base.
- Page 8 Earth Recall If the system is connected to a PBX with earth loop recall, a signalling earth must be connected to the CCU. The earth should be connected to either of the terminals marked 'E' on the exchange line terminal block. The earth is fed to each extension telephone from any of the terminals on the "Recall Earth"...
- Page 9 "SETTING UP" THE SYSTEM When the installation wiring has been completed and before the CCU cover is replaced the system should be "set-up". A block of eighteen "safety pin" type switches is mounted at the lower left hand corner of the CCU, see fig 2 and figs. 4 and 5. FIG.4 ARRANGEMENT OF FACILITY SWITCHES...
- Page 10 "Programmable Ringing". Switches P1 to P4 provide a choice of five ringing programmes. With all the switches P1 to P4 "open" an incoming call is presented to extension 1 for six periods of ringing. If the call is unanswered it is then presented to extension 2 for four periods of ringing, then to extension 3 for four ringing periods.
- Page 11 OPTIONS 1" Full Full ISD & Full Extn Open Access Barring Access Barred Barred STD Barred Barre Barring Barring Switch A - Open Switch A -Open Switch Switch A - Closed Switch A - Closed Switch B - Open Switch B - Closed Switch B - Open Switch B - Closed LOCAL...
- Page 12 FACILITIES The system generates the following tones which are used in conjunction with the available facilities. Tones Dial Tone A continuous tone of 350 Hz and 440 Hz. NU Tone A continuous tone of 440 Hz. Engaged Tone 440 Hz tone 140 m sees ON 140 m sees OFF. Direct Tone A 350 Hz continuous tone mixed with 440 Hz tone interrupted 1 sec ON, 70 m sees OFF.
- Page 13 Intercom calls are secret from the exchange line and no extension can gain access to the intercom circuit when it is in use, unless invited to join a conference. The intercom circuit releases as soon as either user replaces the handset (first party clear).
- Page 14 Divert Intercom Calls. Any extension can arrange for intercom calls to be diverted automatically to another extension. To divert calls the diverting extension lifts the handset and dials followed by the number of the extension to which intercom calls are to be transferred. The divert- ing extension can continue to use the telephone as normal but can only be called by the extension to which his calls are transferred.
- Page 15 CCU, maintenance of the extension telephones being the same as for standard instruments. When a Minimaster 1 is reported "out-of-order" the customer should be asked to switch the power supply off for approximately seconds and to check the operation of the system when the supply is reconnected.
- Page 16 "surge protector" the line will test "low loop" if a "megger" test is applied. The Minimaster 1 may be affected by short-term power breaks or surges and should not share a mains socket with any other appliance, especially one containing electric motors or other inductive loads.
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