Collection of technical manuals and sales documentation relating to the BT Monarch Call Connect System digital PABX

Collection of technical manuals and sales documentation relating to the BT Monarch Call Connect System digital PABX (private automatic branch exchange) including British Telecom sales leaflet, 4-page A4 colour folder, ‘The Monarch 120 Call Connect System’ (1980); Technical manual for use by prospective purchasers, British Telecom, ‘The Monarch 120 Call Connect System, Technical Description Part 1’, A4, comb-bound (1981); Technical manual for use by prospective purchasers, British Telecom, ‘The Monarch 120 Call Connect System, Technical Description Part 2’, A4 comb-bound (1981); Technical manual, British Telecom, ‘Monarch 120 A, B and Compact Call Connect Systems, Man Machine Interface (MMI) Commands with Abbreviated Maintenance Information’, 148 mm x 109 mm, comb-bound (1987); Technical Manual, ‘Monarch System User Guide’, Issue 1 October 1993, for the Monarch Call Connect system, about 100 sheets A4, unbound; Technical manual, ‘Monarch Field Manual for BT field engineers’, Issue 1 April 1996, for the BT Monarch Call Connect system, about 200 sheets A4, unbound; Sales information for the Plessey CDSS1, 4-page A4 colour folder (1980) with five A4 single-sheet leaflets loosely inserted describing variants of the Plessey own-brand version of the Monarch Call Connect system: Plessey CDSS 120; Plessey CDSS 240; Plessey CDSS 60/120 (single cabinet system); Plessey CDSS 60/120 (double cabinet system); and Plessey Paxtel electronic PAX., British, 1980-1996