PLANSET N625 Wall Mounted | ||||||||||||||
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Planset page Prototype pictures of the wall model - includes pictures of the wall mounting bracket How to wire to the UK Plug and Socket system Introduced circa 1965. TELECOMMUNICATIONS INSTRUCTION EXTENSION PLANS INTRODUCTION DESCRIPTION The Main telephone has piano type control keys. There are Table and Wall models, each available in black, grey or ivory. The 10volt d.c. supply for signalling and transmission is normally obtained from the a.c. mains supply by means of a Power-unit No. 53B. If no mains supply is available, eight Cells, Dry, R40 in a Box Battery, No. 10 may be fitted.
The Wall model must be made up using a Telephone No. 711 or 741 and a Plan-Set N625 Wall. When the complete model has been fixed to the wall access to the Plan-Set terminals is gained by pressing the slide bar (which is between the wall and the Plan-Set near the top left corner) with the blade of a screwdriver and moving the Plan-Set body to the right until the studs disengage and allow it to swing open. It is closed by swinging it shut, sliding it to the left and pressing the left hand side to lock the slide bar. The Extension telephones are 700-type fitted with one or more press buttons. OPERATION
The fourth key is non-locking and releases any locked key to establish the 'Main to extension' condition. A white lamp is associated with the EXTENSION TO EXCHANGE key and a red lamp with the SPEAK TO EXTENSION EXCHANGE HELD key. On the table model the lamps glow through lenses behind the keys; on the wall model the lamps glow through the keys which are translucent. The white lamp glows while the EXTENSION TO EXCHANGE key is depressed and the extension handset is off the rest; the red lamp glows while the SPEAK TO EXTENSION EXCHANGE HELD key is depressed and the handset at the main is off the rest, indicating that an exchange line call is being held. Signalling from the Main to the extensions is by means of the two non-locking keys below the four switching keys. Signalling from the extensions is by means of a non-locking button on each extension telephone. FACILITIES Extension Plan 105 is a Main telephone and two extensions. Exchange calls from the Main cannot be heard at the extensions. Exchange calls from an extension can be heard at the other two telephones. Extension Plan 105A is a Main telephone and two extensions. Exchange calls from the Main cannot be heard at the extensions. Exchange calls from an extension can be heard at the other extension but not at the Main. Extension Plan 107 is a Main telephone and one extension. Exchange calls from the Main cannot be heard at the extension but exchange calls from the extension can be heard at the Main. Extension Plan 107A is a Main telephone and one extension. Exchange calls cannot be heard at the other telephone. Intercommunication is possible between Main and extensions and calling is by key at the Main and press button at the extensions. Intercommunication is possible between extensions on Plans 105 or 105A. Internal extensions can call each other directly by buzzer. The assistance of the Main is needed to establish calls between external extensions. Incoming calls ring bells except that, when the exchange line is switched to an external extension a buzzer sounds at the Main. On Plans 107 and 107A only, it is possible to arrange for the bell at the Main to ring in parallel with the extension bell if the customer prefers this to the buzzer. The buzzer may similarly be rendered inoperative if the customer requires that an audible signal should not be given at the Main when the exchange line is switched to the extension. On a Plan 105 or 105A with internal extensions an additional press-button and switch may be fitted in one extension to render the bell inoperative if the customer requires that only one extension shall be rung on night service. LIMITATIONS The plan-set is suitable for use on CB and automatic systems only. External extensions cannot be provided on shared-service exchange line because it would not be possible for the equipment at the main to distinguish between the 'call main' and 'call exchange' signals. For the same reason an external extension cannot be fitted when the main is connected on the non-multiple station of a House Exchange System No. 3. If the plan-set is connected to a PBX, external extensions from the main cannot be provided. because it is not possible to ensure that ringing and battery will be connected to the same wire. This is essential if correct signalling is to be provided between main and extension. Further, it would not be possible for the main to distinguish between 'call main' and 'recall switchboard' signals. CONSTRUCTION In Telephone No. 706 an additional gravity-switch spring-set and capacitor (Adapter, Plan-Set No. 1) should be mounted on the gravity-switch bracket of the Main telephone, with the spring-set opposite the existing gravity-switch spring- set, and the capacitor behind the bracket and regulator. In Telephones No. 746 a Switch No. 19D-1, and a Capacitor No. 7712-2 with a Clip No. 90 should be fitted. On all the telephones the blank grommet (Part No. 1/DBU/199) should be fitted in place of the recovered line cord in the telephone. Using Plan-Set N625 Wall Assuming that the terminal block is fitted at floor level, the maximum height at which the apparatus can be fitted is limited by the length of the cord. The keys on the plan-set should be at a convenient height but the customer should be consulted before the apparatus is finally fixed. Minimum clearances of 1 ft to the right and 6 in to the left are required. In Telephone No. 711 an additional gravity-switch spring-set (Part No. 1/DSP/1501) and a Capacitor, No. 7712-2 in a Clip No. 90 should be mounted on the gravity-switch bracket of the main telephone. In Telephone No. 741 a Switch No. 19D-1 and a Kit 166A are used in place of Part 1/DSP/1501. POWER SUPPLY When required, the Converter Ringing, No. 9A (Diagram N626) should be mounted with the relay uppermost, adjacent to the terminal block. EXTENSION BUZZER If a Trimphone is fitted a Buzzer No. 20B should be fitted adjacent to the terminal block. BELL LOUDNESS COMBINATIONS OF EXTENSION PLANS INTERFERENCE Radio interference may occasionally be experienced on installations with external extensions. This is usually due to the diode in the Converter Ringing, No. 9A. Later issues have the diode bypassed with a 0.1pf capacitor. Where this is not included by the manufacturer it should be provided locally. RECORDS If ringing is applied directly to the pair connecting an early version of the plan-set to an external extension, the transistors in the plan-set will be damaged. When an external extension pair is routed via the exchange the following note should be made in the remarks space on the fault card for the extension:- 'Transistorised equipment. Do not apply ringing to this circuit." CORDS INSTRUMENT An extract from A Wall Mounting Version of the Switching Unit for Use with
700-Type Telephones A switching unit is required with 700-type telephones on extension plans with inter-communication. For table telephones the unit takes the form of a plinth fitted beneath the telephone. A version of the unit for use with wall-mounting telephones is described in this article. INTRODUCTION DESCRIPTION CONCLUSIONS ACKNOWLEDGEMENT
Planset 625 superseded the Bellset No's. 39 & 44, which were used on Plans 5 & 7. Diagram for 1 extension working - N4509. Diagram for 2 extension working - N4507. Diagram for Planset 625 - N625. Drawing No. 92062. Diagram for Converter Ringing No. 9 - N626. GEC Marketing Pictures
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Last revised: July 23, 2024FM |
The Table model is available complete as
Planphone A, pre-wired to Diagram N 628 - see Vocabulary of Engineering Stores. The field
of use of the Planphone A is given in TI C3 C0025. The table model can also be made up
using a Telephone No. 706, 710 or 746 and a Plan-Set N625 Table. A Telephone No. 740 need
never be used on a Plan-Set as the Telephone No. 746 can accept the necessary auxiliary
gravity-switches for the most complex arrangement. 
The wall-mounting version of the Plan-Set N 625 provides the same facilities
as the table version and, as far as possible, uses the same components. In three features,
however, it differs from the table version. The base consists of a framework and
back plate
connected by a double-acting hinge. This is held shut by a spring-loaded catch operated by
a slide bar. To gain access to the plan-set when it is mounted on the wall the slide bar
may be pressed with the blade of a screwdriver and the body slid to the right until two
studs disengage from slots in the edge of the back plate. The plan-set will then swing
open. To close the plan-set the studs are engaged in the baseplate, the body slid to the
left and pressure applied to the hinged end to lock the slide bar. The cord passes through
the back plate and is held by a clamp. It is unusual to provide wall-mounted apparatus with
a cord and terminal block, but this has been done to avoid the necessity of running
several cables up the wall. All keys are of translucent opal Cellulose
Acetate Butyraie (c.a.b.). When the SPK EXTN EXCH HELD and EXTN TO EXCH keys are depressed they
are illuminated by a red lamp and a white lamp, respectively. 
