Nortel T1/SMDI Configuration Manual page 177

February 2008
CallPilot SMDI link RS-232 characteristics
All specifications for the RS-232 interface are included in the
EIA/TIA-232-F specification. Some of the salient characteristics are shown
here for convenience. For more information, refer to Reference Number 1
listed on page 188.
CallPilot SMDI link RS-232 mark/space electrical characteristics
RS-232 has specific requirements for both the transmitted and received
voltage levels used to represent mark and space logical bits.
Mark/space electrical characteristics
T1/SMDI and CallPilot Server Configuration
Voltage
Logic 0
Transition Region
Logic 1
+25v
Space
+3v
-3v
-25v
CallPilot T1/SMDI interfaces
Space
Time
Mark
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