What is the difference between single ended scsi and differential scsi

All forum topics Previous Topic Next Topic. Honored Contributor. For a logical "zero", zero voltage is sent on both wires. For a logical "one", the first wire of each signal pair contains a positive voltage, similar to the signal on an SE bus, but not necessarily at the same voltage.

The second wire contains the electrical opposite of the first wire. The circuitry at the receiving device takes the difference between the two signals sent, and thus sees a relatively high voltage for a one, and a zero voltage for a zero. Regards, Naveej practice makes a man perfect!!! Trusted Contributor. Regards, Suraj What we cannot speak about we must pass over in silence.

And watch out as 'differential' is not always the same as 'differential'. The old 'differential' is called "HVD" high voltage differential these days and is completely incompatible with "SE" single ended or "LVD" low voltage differential.

It includes connector pictures. Regds TT Attitude not aptitude determines altitude. Outstanding Contributor. Each type has a "speed", a "bus width", and a "signal type". For consistency they ought to have renamed it "Slow" or "Single Speed" or "1x" or something when "Fast" came out. If you didn't specify "Narrow" or "Wide" it was assumed to be "Narrow". To determine if it is an 8-bit or bit system, simply look to see if the SCSI connector has 50 pins or 68 pins.

The pin connector is an 8-bit system and the pin connector is, of course, a bit system. Note that older Macintosh computers use a pin connector and are always single-ended. Make sure the power to the computer is turned off. Pull the cable connector off the host's SCSI port and measure the resistance between pins 2 and 24 on high-density or Centronics-type pin connector or between pins 2 and 33 on a pin connector.

If the resistance is a few tenths of an ohm or less, it is a single-ended SCSI port. Here are a couple of easy things to do to determine this information: 1. Known as the pin high-density SCSI connector. The SCSI recognized version has "latch" type fasteners. This pin-and-socket DB25 connector was used on Apple computers, devices directed at the Apple market and some older Sun workstations.