Inter-Tel AXXESS Manual page 145

5.28 The data device can be used by the associated Executive Display, Professional Display,
Standard Display, Associate Display, Model 8520, or Model 8560 Phone(s) to communicate
with remote data equipment over voice channels being used for CO [local exchange] or inter-
com calls. See
NOTE:
5.29 The MDPM ring signal waveform has the following characteristics:
•
20 Hz
•
200 volts peak-to-peak
•
48% duty cycle
•
No DC offset (superimposed on circuit ground)
Optional Modem Data Port Module (MDPM)
INTER-TEL
pages 3-201 and 5-269
Each "equipped" MDPM installed counts as one single-line device.
® ®
AXXESS MANUAL VERSION 11.0 – May 2008
for installation and operation instructions.
Specifications
Page 2-77
2