GEC No. 5500 Type
PRIVATE AUTOMATIC EXCHANGES
THE No. 5500 type G.E.C.-P.A.X. is used for exchanges from 400 lines upwards, and bears a closer resemblance to a public automatic exchange than to a P.A.X. of the usual type.
To these larger-size installations a separate switchroom is allotted, the switching equipment being mounted on substantial steel racks, with the individual apparatus, where necessary, protected by metal covers.
The illustration shows a view of the No. 5500 type private automatic exchange equipment supplied by The Reliance Telephone Company to Messrs. Imperial Chemical Industries, London.
The lay-out of the equipment of these larger exchanges depends so much on local conditions, that a general description is outside the scope of this publication. On receipt of an enquiry, however, the Company will gladly prepare a detailed scheme to meet any requirements.
Taken from the GEC Private Automatic Telephone Exchanges No. 18/2 (undated)
Last revised: August 20, 2012