Trademark:

5ESS is a registered trademark of AT&T DMS-100 is a trademark of Northern Telecom, Inc. ISU is a trademark of ADTRAN, Inc.

901 Explorer Boulevard

P.O. Box 140000

Huntsville, AL 35814-4000

Phone: (205) 963-8000

© 1997 ADTRAN, Inc.

All rights reserved.

Printed in USA.

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ADTRAN ISU 512 user manual Trademark