Ccitt V.35 Interface; Line Descriptions - IBM 3704 Reference Manual

CCITI V. 35 Interface
Line Descriptions
For the IBM 3704 and 3705 driver circuits, the voltage levels are:
- - - - - - - + 5 . 9 7
v
Mark
> - - - - - - - - + 5 . 3 0
v
-5.29
v
Space
-5.95
v
The IBM 3704 and 3705 provide CCITT Recommended V.35 interfaces for
attaching one half-duplex line to an external data set that can handle up to 56,000
bps. The 3704and 3705 control program must condition this line interface for
external clock control.
The following shows the interface lines used by the 3704 and 3705.
Pin Line Description
A +Transmit Clock
C Request to Send
D Clear to Send
E Data Set Ready
F Receive Signal Detector
P . . . ; . . Transmitted Data
R -Receive Data
S +Transmitted Data
T +Receive Data
V +Receive Clock
X -Receive Clock
Y -Transmit Clock
The cable provided by the IBM 3704 and 3705 line sets terminates at the modem
end with a Winchester Electric connector (part number XAC34PD3300), or
equivalent.
+Transmit Clock. The modem generates differential voltage levels on this circuit
to be used by the IBM 3704 and 3705.
Request to Send. The Request to Send line is a request for the modem to transmit
the data presented on the Transmitted Data line. When the 3704 and 3705 bring
up Request to Send, the modem must respond with Clear to Send and transmit the
data presented on the Transmitted Data line.
Communication Interfaces 19