The GPO/PO/BT had many publications that make excellent reference sources. The A range (A series also included forms etc) is listed below - but this is not the complete list - why not advise us of the missing ones?

Instruction leaflets were usually a white A5 card with the instructions printed on them. If a lot of information was needed (e.g. switchboard instructions) then a small booklet was produced.

A list of the A range is partially available in database form

3 Internal
Issue 2, July 1972


The preparation and issue of instruction cards for subscribers' direct exchange lines and certain simpler Extension Plan installations has ceased. The greater part of the relative information is contained in the directory preface.

Instruction cards or booklets should only be provided when the following are installed:-

  • Private Branch Exchanges
  • Police switchboard
  • Fireman's call-out installations
  • House exchange installations
  • Main stations of Extension Plans 105, 105A, 107 and 107A
  • Privacy equipment
  • Loudspeaking Telephones
  • Answering Sets.

Reference should be made to G0081 for the instruction cards to be provided at public call offices and subscribers' coin box installations.

The codes to be dialled by subscribers to reach other exchanges may be shown in one of the following ways:-

(a) On a dialling code card A5599. This card is designed to fit inside the drawer of a 200- or 300- type telephone.

(b) In a separate dialling code booklet (STD areas only).

(c) In the preface to the main or local telephone directory.

The instruction cards and booklets listed in Table 1 should be requisitioned by the Area Stationery Duty. Dialling code cards and books will be requisitioned by the TM (Traffic Division).


A1311 Answering Set No. 1
A1377 Answering Set No. 2A

A3861 Callmaker, Key (Autodial 101A)
A1169 Callmaker, Tape (Autodial 201A)
A1160 Callmaker, Card (Autodial 301A)
A3205 Extension Plans 105, 105A, 107 and 107A
A3280 Extension Plans 105, 105A, 107 and 107A (wall-mounted)

A5454 Firemen's Call-out System DX - call-out
A5455 Firemen's Call-out System DX (testing)
A5456 Firemen's Call-out System DX - ring-out
A5457 Firemen's Call-out System DX (testing)
A5450 Firemen's Call-out System G - call-out
A5451 Firemen's Call-out System G (testing)
A5452 Firemen's Call-out System G - ring-out
A5453 Firemen's Call-out System G (testing)
A5603 Firemen's Call-out System K - call-out
A5604 Firemen's Call-out System K (testing)
A5605 Firemen's Call-out System K - ring-out
A5606 Firemen's Call-out System K (testing)

A1366 HES Nos. 1 and 2
A3112 HES No. 3 (Keymaster 1 + 5)
A1385 HES No. 4 (Keymaster 2 + 10)
A3738 HES No. 4 (extension telephone)

A3193 Key and Lamp Unit No. 2A and 10A
A973 Keycaller, mechanical
A4421 Keyphone, SC
A4422 Keyphone, SC P107/105 (main)
A4412 Keyphone, Planset KDC 107/105
A4414 Keyphone, Keyplan KDC 107/105
A4413 Keyphone, Keyplan KDC 2
A4415 Keyphone, Loudspeaking DC
A4411 Keyphone, DC
A4406 Keyphone, MF

A3111 Loudspeaking Telephones Nos. 1 and 1A
A3170 Loudspeaking Telephones Nos. 2, 2A and 2B
A3172 Loudspeaking Telephones No. 3
A3748 Loudspeaking Telephones No. 4

A3040 Meter No. 19 (subscriber's private meter)

A1368 PABX No. 1 (switchboard)
A3373 PABX No. 1 (extension telephone)
A1369 PABX No. 2 (switchboard)
A3372 PABX No. 2 (extension telephone)
A1369 PABX No. 3 (switchboard)
A3061 PABX No. 3 (extension telephone)
A1137 PABX No. 4 (switchboard)
A3302 PABX No. 4 (extension telephone)
A3050 PABX No. 5
A3403 PABX No. 6
A1167 PABX No. 7 (switchboard)
A3851 PABX No. 7 (extension telephone)
A1302 PMBX's Nos. 1A and 1B installations
A354 Privacy Sets
A3354 Switchboards AT 3796
A3318 CB 873
A3258 CB 935
A1317 PA 150 (police telephone system)
A1310 PMBX No. 2/2A
A1315 PMBX No. 2/3A
A1303 PMBX No. 2/4A
A1375 PMBX No. 4
A3717 Trimphone

Conversion of an exchange area to automatic working If pre-transfer visits are made by the traffic staff, the instruction cards are distributed by visiting officers. If pre-transfer visits are not made by the traffic staff,' instruction cards should be distributed by the engineering officer making the dial-speed test. Dialling code cards and booklets will be dispatched by the TM (Traffic Divn).

Conversion of subscribers' installations from one exchange system to another On small area-correction transfers if a change of system is involved, the installation officer should normally provide the instruction cards for installations specified in par 2. If a large group of subscribers is concerned, the supply may be arranged by the TM (Traffic Divn).

New Installations on existing exchanges If the apparatus is listed in par 2, the -Instruction card or booklet should be provided by the installation staff, who should also supply a dialling code card or booklet as appropriate.

Subscribers should be advised to keep the card or booklet close to the point of use. At certain PBXs a hook may be provided for the purpose (see E3001).

Installation controls and detached fitting centres should hold small stocks of the instruction and dialling code cards and booklets detailed in Table1. Except for cards referring to obsolescent apparatus known to exist in the Area and apparatus which is not covered by current cards or booklets, stocks of obsolescent cards and booklets should be made waste.

These subscribers will usually be able to memorise the dialling coded used, but if they appear to be in any difficulty a Braille dialling code list is required the TM (Traffic Divn) should be advised.

(From EI Telephones, Stations, A3201)

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Last revised: October 30, 2022