A Made IT project
V.35 is a partially balanced, partially single-ended interface specification. The data leads and clock leads are balanced, the handshake leads are single-ended. Most commonly used for 56kbps and 64kbps data rates.
|DATA LEADS||CONTROL LEADS|
|Vdc||B > A||A > B||-3 to -25||+3 to +25|
Transmitter output voltage from a balanced tranmitter indicating a MARK is +0.35Vdc for the B line, -0.2Vdc for the A line. Indication of a SPACE condition is +0.35Vdc for the A line, -0.2Vdc for the B line. Output voltage difference is 0.55Vdc. To make sense to the receiver it must be at least 0.01Vdc difference between the A line and B line. Maximum cable length depends on required speed and cable capacitance. The extremes specified are 2000ft/600m to 4000ft/1200m @ 100kbps, 300ft/90m at 10Mbps. Sync applications only, no async V.35 equipment around.
More speed/distance equations: 610m @ 64 kbps.
|M/34 Male||M/34 Female|
|C||Request To Send||RTS||Out||In|
|D||Clear To Send||CTS||In||Out|
|E||Data Set Ready||DSR||In||Out|
|F||Data Carrier Detect||DCD||In||Out|
|H||Data Terminal Ready||DTR||Out||In|
|P||Send Data A||TxD-||Out||In|
|R||Receive Data A||RxD-||In||Out|
|S||Send Data B||TxD+||Out||In|
|T||Receive Data B||RxD+||In||Out|
|U||Terminal Timing A||Out||In|
|V||Receive Timing A||In||Out|
|W||Terminal Timing B||Out||In|
|X||Receive Timing B||In||Out|
|Y||Send Timing A||In||Out|
|AA||Send Timing B||In||Out|
There seem to be two versions of the V.35 pinning. One is called V.35 Winchester, the other is called V.35 Straight. One is mirrored to the other. We don't know how it is mirrored. This information came from a 3Com source. Their Access Builder 4000 V.35 Card interface is V.35 Straight they say. The Dutch PTT supplies V.35 interface according to V.35 Winchester. Connecting these two requires some sort of crossed cable. Crossed pinning presently unknown. If someone has more information please let us know!
There are two versions of V.35 screw locks. The US-version measures 16/10 mm (the large one), the French version measures 10/10 mm (the small one). The US-version is also known as Domestic and the French version is also called International.