BICC Network Systems Plc, headquartered in Hemel Hempstead, Hertfordshire has a new optical fibre modem that can warn computer users of attempts to hack information from the fibre: the modem is used as part of an optical fibre personal computer network or terminaltohost mainframe connection, and it signals when attempts are made to disconnect or replace parts of a network, or when light loss is detected in the fibre; it also provides duplex transmission over a single optical fibre, asynchronous data rates of up to 19.2Kbps and 1,000-yard cable lengths; the modem is currently used in a Ministry of Defence local area network, and it conforms with EIA and CCITT standards; it is designed to plug into an RS232 port and sells for UKP300.
