1. Specification for X.25 packet level protocol for data terminal equipment for information processing systems. (31st October 1989) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (155 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
2. Open systems interconnection: specification for internal organization of the Network Layer. (31st December 1989) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (40 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗