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Line Descriptions
Electrical Characteristics
Line Description
Transmit Clock
Signal Return Transmit
Clock
Receive Clock
Signal Return
Receive Clock
Mark Receive Data
Signal Return
Receive Data
Mark Send Data
Ground Send Data
I/O Gate
Connector
Pin
D02
B13
BOS
B02
D06
D07
DlO
Bll
Active
Voltage
Level
+MIL188
-MIL188
+MIL188
-MIL188
+MIL188
-MIL188
+MIL188
-MIL188
Transmit Clock and Signal Return Transmit Clock. The modem generates MIL-
STD-188C voltage signals on this circuit to be used by the IBM 3704 and 3705.
Receive Clock and Signal Return Receive Clock. The modem generates MIL-STD-
188C voltage signals on this circuit to be used by the IBM 3704 and 3705.
Mark Receive Data and Signal Return Receive Data. The modem generates
MIL-STD-188C voltage signals on this circuit when a data bit is received from the
communication channel.
Mark Send Data and Ground Send Data. The IBM 3704 and 3705 generate
MIL-STD-188C voltage signals on this circuit to indicate that a bit is to be
transmitted over the communication channel.
All MIL-STD-188C signals are balanced with respect to ground and should be
measured differentially.
For the IBM 3704 and 3705 terminator circuits, the voltage levels are:
Logical 1 or Mark
Logical 0 or Space
Minimum
+0.5V
-0.5V
Maximum
+7.0V
-7.0V
18
IBM 3704 and 3705 Communications Controllers Original Equipment Manufacturers' Information
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