Installing A Dual Tone Multiple Frequency (DTMF)
Receiver Card In The DXP Plus Digital Communications
System
1.0 Introducing The DTMF Receiver Card
The DXP Plus digital communications system supports the use of on-premise industry-standard telephones.
To support the DTMF dialing of industry standard telephones, the DXP Plus services board provides on-board
DTMF receiver circuitry. This circuitry supports dialing of one industry-standard telephone at a time. This
provision is adequate, if your site requires only a few industry-standard telephones; however. if you intend to
support a population of industry-standard telephones that will generate a large volume of outgoing call traffic, you
must install one or more DTMF receiver cards to provide additional DTMF receivers for the telephones. Each
DXOPT–TON card allows four industry-standard telephones to dial simultaneously. The number of cards that you
need to install in the system depends upon how active the industry-standard telephones will be at the site. See
Section 1.1 for details.
If you do need to add receiver cards, you have three choices as to where to install them.
1. The best and recommended choice is to add one receiver card to top position on the main cabinet’s services
board.
NOTE: You can add two additional receiver cards to the lower two positions on the services board; however, you
must take specific programming action to enable their use (the name of this program option is: Services
DTMF Highway). If you add these two cards and take this program option, you can only add one card to
the lower expansion cabinet’s interface board (discussed in step 2 below).
2. The second best choice is to add up to three receiver cards to each expansion cabinet’s interface board if one
or both is available. Remember, add only one card to the lower expansion cabinet’s interface board if you
have added or will add two additional receiver cards to the lower two positions on the services board and take
programming action to enable their use
3. The third choice is to add an auxiliary board to the system and install up to four DTMF receiver cards on it.
This is the least desirable choice because it requires you to occupy a board slot that you could otherwise use
for line or station boards.
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This manual has been developed by Comdial Corporation (the “Company”) and is intended for the use of its customers and service personnel. The information in this manual is subject to change
without notice. While every effort has been made to eliminate errors, the Company disclaims liability for any difficulties arising from the interpretation of the information contained herein.
The information contained herein does not purport to cover all details or variations in equipment or to provide for every possible contingency to be met in connection with installation, operation, or
maintenance. Should further information be desired, or should particular problems arise which are not covered sufficiently for the purchaser’s purposes, contact Comdial, Inside Sales Department,
Charlottesville, Virginia 22906.
Printed in U.S.A.
IMI89-186.01
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