511. Specification for modems for connection to the British Telecommunications public switched telephone network. (30th July 1982) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (8 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
512. Essential requirements for terminal equipment intended for connection to digital interfaces of the PSTN using channel associated signalling. (15th February 1995) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (34 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
513. Information technology. Portable operating system interface (POSIX). Shell and utilities Part 2, (1st October 1995) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (8 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
514. Essential requirements for terminal equipment intended for connection to unstructured digital leased circuits of the public telecommunications network using a CCITT Recommendation G.703 interface at a rate of 8448 kbit/s with a 75 ohms unbalanced presentation. (15th November 1994) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (32 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
515. Information technology. Portable operating system interface (POSIX). System application program interface (API) [C LANGUAGE] Part 1, (29th March 1991) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (390 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
516. Information technology. Programming languages, their environments and system software interfaces. Guidelines for language bindings. (15th August 1994) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (42 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
517. Essential requirements for terminal equipment intended for connection to unstructured digital leased circuits of the public telecommunications network using a CCITT Recommendation G.703 interface at a rate of 34368 kbit/s with a 75 Ω unbalanced presentation. (15th November 1994) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (32 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
518. Essential requirements for terminal equipment intended for connection to analogue interfaces of the PSTN using direct dialling in. (15th May 1995) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (36 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
519. Data communication for HVAC Application Management Net. System neutral data transmission by open communication for building automation (FND) Part 2, (15th April 1996) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (82 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
520. Information technology. Document processing and related communication. User interface to telephone-based services. Voice messaging applications. (15th July 1995) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (50 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗