A new digital long haul communications system, known as the LD-4, is presently being developed by Bell-Northern Research. This system is designed to operate on a buried 12 tube coaxial cable (0.375" tubes) with a route capacity in excess of 20,000 2-way circuits.
© 1974 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1974
Association for Materials Protection and Performance (AMPP)
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