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Pinouts and cables for telecomms
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V.35 connector

  
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CCITT V.35
V.35 describes the modulation methods for 48Kb/s synchronous full duplex data communication circuits. It also redefines the V.24 circuits 103,104,114 and 115 to make them balanced circuits.The voltage differences between signal and return wire is +/-0.55 Volts , the remaining circuits are unbalanced. This interface is used for 56Kb/s and 64Kb/s circuits but is being replaced by X.21.
 
V.35 Electrical Characteristics
Logic state Voltage levels
Control Data Input Output
OFF 1 < -70mV -0.55 V
ON 0 > +70mV +0.55 V
V.35 voltages are not compatable with V.10 or V.11 voltages.
 

ISO-2593 assigns the circuits for V.35 on a 34 pin square connector.  
 
V.35 Pin Designations ISO 2593
CCITT No Pin No DTE -- DCE Description
102 B ---------- Signal ground
103 P , S Transmit data
104 R , T Receive data
105 C RTS Request to send
106 D RTS Ready for sending
107 E DSR Data set ready
108.1 H DTR Connect data set to line
109 F Data Channel Receive Line Signal Detector              (105 is ON at other end)
113 U , W Transmitter signal element timing from DCE
114 Y , AA Transmitter signal element timing from DCE
115 V , X Receiver signal element timing from DCE
141 L Test control
142 NN Test indicator
v35
   
    V.35 describes the modulation methods for 48Kb/s synchronous full duplex data communication circuits. It also redefines the V.24 circuits 103,104,114 and 115 to make them balanced circuits.The voltage differences between signal and return wire is +/-0.55 Volts , the remaining circuits are unbalanced. This interface is used for 56Kb/s and 64Kb/s circuits but is being replaced by X.21.
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  If you find this useful and have information to add email Martin Ryan. All contributions , queries and constructive criticisms are welcome.  
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