Re: Need 66-block help. 1 POTS line, 8 jacks

[Lewis Gardner <lgardner@xxxxxxxxxxxxxxxxxxxxxxxxxx>]

Jack wrote:

>>>1. aa bb
>>>2. cc dd
>>>3. ee ff
>>>4. gg hh
>>>5. ii jj
>>>6. kk ll
>>>7. mm nn
>>>8. oo pp


> First of all, what is the difference between white/blue and
> blue/white, etc?

The below is from nps-vip.net/tester/colors.htm it explains the color
coding better than I can.

"If you look at the top 2 wires closely you will notice that one wire is
mostly white with a regular band of blue. This is the Tip. The second
wire is mostly blue with an regular band of white. This is the ring. Ok
so the bands are kind of hard to see. But when seen in longer lengths
and twisted, you can make out the colors easier. The wires are twisted
to prevent the signal on one pair of wires from "leaking" into the others."


> Secondly, you said "The order for the first cable
> will be...white/blue to bb". In my representation above, "bb"
> represents 2 places to punch down. Are you saying punch the same wire
> in 2 places?

Sorry I was not more clear. Since you will be using bridging clips you
will only be punching wires on the outside positions. The inside
positions are where the clips go. See en.wikipedia.org/wiki/66_block

On the left side you will flip your punchdown tool to the non-cut side
and loop the incoming line to all the leftmost positions matching the
blue pair. Complete the circuit with clips.


> Thirdly, if the incoming lines loop from aa to mm and
> from cc to oo, it seems a waste of time to punch down the jack lines
> in between. There's nothing to bridge them to.

Like I said in the last post "The idea behind wiring blocks is to
provide a permanent termination for installed wiring." Just because you
are not using the other two pairs now that does not mean that they will
never be used. The practice is to terminate all installed wiring to the
block.


> Lastly, if what you say is correct,
> then my 50-pair 66 block can only support 8 jacks?

Yes with 3 pair 8*3=24. I usually use 4 pair so 6 jacks per 66 or since
I usually use 110 that gives me 20 jacks per block. 5 pair is quite
common so that gives 5 per 66.