61. Specification for electrical safety requirements for apparatus for connection to telecommunication networks. (31st October 1989) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (31 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
62. Specification for hard-drawn copper and copper-cadmium wire for telegraph and telephone purposes. (25th June 1970) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (18 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
63. Specification for modems for connection to public switched telephone networks and speech band private circuits run by certain public telecommunications operators. (31st October 1992) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (16 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
64. Total Access Communication System (T.A.C.S). Specification for performance and tests of the signalling system of mobile stations Part 2, (31st May 1990) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (130 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
65. Total Access Communication System (T.A.C.S). Specification for performance requirements for mobile stations Part 1, (31st May 1990) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (74 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗