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4TEL analogue automatic automation British Telecom International British Telecom Journal cable cableships capability cent centre channel circuits communications systems competition components connected cost countries customers dialling display Division DPNSS earth station efficiency electronic engineering equipment exchange facilities fault Ferranti fibre optic improved industry installed integrated Keybridge Limited London maintenance major manufactured Martlesham Merlin microwave million Mitel module needs offer operation optical fibre organisation PABX packet switching planning Plessey Prestel problems processor programme protection radio range record requirements Road satellite signalling staff standard subscribers suppliers supply System X Telecom Gold telecommunications telephone areas teleprinter teletex television Telex Teradyne terminal traffic transmission unit users viewdata Voicebank word processors