1.2
Determining The Board Configuration That You Will Need
Use the following specifications to determine the maximum number of station boards and DTMF receiver cards
that you may need.
•
Each eight-station board supports up to eight telephones. (It will actually support 16 telephones—two
telephones at each port sharing a common intercom number.)
•
Up to two industry-standard telephones can be bridged at one station port as long as you do not exceed a
combined ringer equivalence number, or REN, of 2.0. (Remember, with two telephones at the same port,
they share a common intercom number.)
•
Each 16-station board supports up to 16 telephones. (It will actually support 32 telephones—two telephones at
each port sharing a common intercom number)
•
Up to two industry-standard telephones can be bridged at one station port as long as you do not exceed a
combined ringer equivalence number, or REN, of 2.0. (Remember, with two telephones at the same port,
they share a common intercom number.)
•
Each receiver card allows four industry-standard telephones to dial simultaneously. (The number of cards that
you need to install in the system will depend upon how active the industry-standard telephones will be at the
site.)
•
You can install one receiver card in the top position on the services board. The services board always
provides on-board DTMF receiver circuitry capable of supporting simultaneous dialing of one
industry-standard telephone. With the addition of a receiver card, the services board supports simultaneous
dialing of five industry-standard telephones. 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
(this program feature name is: Services DTMF Highway). With these additional two cards, the services
board supports simultaneous dialing of 13 industry-standard telephones.
•
You can install three receiver cards on the upper and lower expansion cabinet interface boards. With three
receiver cards installed, each interface board supports simultaneous dialing of 12 industry-standard
telephones.
CAUTION
If you add two additional receiver cards to the lower two positions on the services board, you can add
only one receiver card to the lower expansion cabinet’s interface board..
•
You can install four receiver cards on an auxiliary board. With four receiver cards installed, an auxiliary
board supports simultaneous dialing of 16 industry-standard telephones (Remember, while you can install
up to five auxiliary boards in the system, each auxiliary board that you use occupies a slot where you could
install a station or line board.)
Based upon the above specifications, a fully-equipped DXP Plus system with a minimum of one line board and
no auxiliary boards will provide the following industry-standard telephone support:
•
main cabinet (reserving one slot for a line board) supports 128 telephones (eight 16-station boards times 16
station ports per board—256 telephones with two telephones per station port sharing the same extension
number),
•
upper expansion cabinet supports 176 telephones (eleven 16-station boards times 16 station ports per
board—352 telephones with two telephones per station port sharing the same extension number),
•
lower expansion cabinet supports 160 telephones (ten 16-station boards times 16 station ports per board—320
telephones with two telephones per station port sharing the same extension number).
These individual totals add together to provide a system support total of 464 telephones (The total is 928
telephones with two telephones per station port sharing the same intercom number.)
IMI89–186
Installing The DTMF Receiver Card
2 – Installing The DTMF Receiver Card
