Adder Technology ALSTX/ALSRX, ALTX/ALRX manual Maximising the video quality for long cable lengths

Maximising the video quality for long cable lengths

All twisted pair cables are constructed so that each of the twisted pairs has a slightly different twist rate. This is to reduce the electrical cross-talk between signals travelling on adjacent pairs. This difference in twist frequency effectively means that the wire distance that an electrical signal has to traverse is different for the different pairs. This does not normally cause a noticeable problem but for higher screen resolutions at longer cable lengths a colour separation effect may start to be observed.

In practice most networking cables have one pair of conductors that are significantly more tightly twisted than the other three. Unfortunately this varies between cable types and manufacturers. If you do observe a colour separation effect at high screen resolutions and longer cable lengths then this may be improved by swapping the twisted pairs that are used within the cable. To gain the best results the red, green and blue AdderLink colour signals should be sent over the three pairs that have the closest twist frequency. This normally means that the pair with the tightest twist frequency should be avoided.

If you do not already have a cable and you wish to purchase a suitable cable then this may be purchased from Adder Technology via your supplier. High quality cables are also available that remove this colour separation effect completely.

A4. RS232 port pin assignments

View of AdderLink 9-way D-type female socket

AdderLink Installation and Use Page 48