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voltage drop in long null modem cabe
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voltage drop in long null modem cabe - 01-October-2008, 14:14

my receiver is downstairs and my pc is in an upstars bedroom. technomate needs to be connected to pc at all times for card sharing.


1. what is the maximum cable length between box and pc?

2. can the 1000 and the 1500 series tm recievers be treated the same when it comes to card sharing as long ad you just want to connect to a server and NOT share a local?

3. If everything is set up right, forgetting the obvious inconveniences is comparison to it, is there and reason why the tm1000d would be any less smooth in operation than a dreambox?
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01-October-2008, 20:58

Well.. I can only answer question 1 for you as i don't know anything of those recievers but according to the specs

Maximum cable lengths
Cable length is one of the most discussed items in RS232 world. The standard has a clear answer, the maximum cable length is 50 feet, or the cable length equal to a capacitance of 2500 pF. The latter rule is often forgotten. This means that using a cable with low capacitance allows you to span longer distances without going beyond the limitations of the standard. If for example UTP CAT-5 cable is used with a typical capacitance of 17 pF/ft, the maximum allowed cable length is 147 feet.

The cable length mentioned in the standard allows maximum communication speed to occur. If speed is reduced by a factor 2 or 4, the maximum length increases dramatically. Texas Instruments has done some practical experiments years ago at different baud rates to test the maximum allowed cable lengths. Keep in mind, that the RS232 standard was originally developed for 20 kbps. By halving the maximum communication speed, the allowed cable length increases a factor ten!

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cabe, drop, long, modem, null, voltage

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