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I have bought a network cable tester and in the manual it said that all lights from 1-8-G should light up in sequence. However I get only 8 without G, although the cable is in working condition.

Here is a picture of the manual:

enter image description here

Here is a video

The product's model is NS-468. If you have the same product, can you tell me what is wrong and what G is intended for?

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G = ground => for STP (Shielded Twisted Pair) Most common use is unshielded. – Fiasco Labs Mar 16 at 19:57
up vote 11 down vote accepted

There is nothing wrong with your tester.
There are 8 strands in an unshielded network cable which is what you tested in your video.
A shielded cable also has a grounded metal sheath surrounding the 8 strands. The G on your tester refers to this.
I have a similar tester but in mine the shield is referred to as "Shield".

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G refers to metal sheath? If so, why it does not blink? – Boris_yo Sep 30 '11 at 18:34
    
The cable in your video doesn't appear to have one, it's unshielded. – Tog Sep 30 '11 at 18:36
    
There is nothing wrong with that, it is a perfectly valid cable type. – Tog Sep 30 '11 at 18:42
    
Oh i got it now. I was slow back then. – Boris_yo Oct 2 '11 at 21:09

In my CHL-468 tester, the G position is not populated by an LED. I actually soldered in an LED and got it to work.

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