CAUTION
Install or remove modules from the shelf only when the power is off.
If you install a module in the shelf with the power on, the internal
circuitry may suffer damage and the product warranty will be void.
Remove and install circuit boards only in a static-safe environment
(use antistatic wrist straps, smocks, footwear, etc.).
Keep circuit boards in their antistatic bags when they are not in use.
Do not ship or store circuit boards near strong electrostatic, electromag-
netic, magnetic, or radioactive fields.
For more complete information on electrostatic discharge safety
precautions, refer to Bellcore
TM
Technical Reference # TR-NWT-000870.
Copyright 1998 by Dantel, Inc. • Dantel is a registered trademark of Dantel, Inc. • ISO 9001 Registered
Printed in the U.S.A.
I
NSTALLATION
& O
PERATION
M
ANUAL
44020-0998 <90-00001>
44020 DTMF
D
ECODER
M
ODULE
About this Practice:
This document has been reissued to
• Renumber figures.
Issue date: September 1998
Reissued Practices:
Updated and
new content can be identified by a
banner in the right margin.
UPDATED
Table of Contents
Ordering Information ........................................................................... 2
General Description.............................................................................. 2
Circuit Description ............................................................................... 3
Application Information ....................................................................... 8
Installation.......................................................................................... 10
Operation ............................................................................................ 16
Technical Specifications ..................................................................... 17
Warranty ............................................................................................. 18
