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61 posts

Master Geek
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Topic # 115432 25-Mar-2013 21:40
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Just wondering what advice people have on the best way to reliably join two lengths of Cat5e cable. 

I have some solid core armoured Cat5 running about 8 meters out to a pair of 20,000L underground water tanks. The cable comes up through a sleeve in the foundation and was left disconnected behind a blank wall plate.  There is a second solid core Cat5e cable behind the blank faceplate running about another 8m back to the 'storage' room where it's terminated with a single RJ45 faceplate rather than on the patch panel so as not to be confused with the normal network runs.

The reason for having all of this is to remotely monitor the water level in the tanks using an HC-SR04 ultrasonic transducer mounted on the tank ceiling to measure the distance down to the water surface.  I was planning on putting just the transducer in the tank, and an Arduino back in the storage room.  Alternatively I could put both the Arduino and transducer in tank and power it using PoE.

Any recommendations on the best way to join these two cables, or the merits of having the Arduino in the tank with the sensor rather than back in the less hostile environment of the storage room would be appreciated.

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370 posts

Ultimate Geek
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  Reply # 786957 25-Mar-2013 22:08
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Best method would be a punch down joiner such as:
Sorry can't comment on best position for the Arduino.

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Uber Geek
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  Reply # 786992 26-Mar-2013 06:34
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you could use the gel filled IDC connectors (just like the chorus guys use), they are only a few cents each from places like Ja Russell or Ideal

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Uber Geek
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  Reply # 787005 26-Mar-2013 07:59
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Hi, yes if its not for data then scotch locs (gel filled IDC's) are the best.


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Uber Geek
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  Reply # 787032 26-Mar-2013 09:24
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So are scotch locks not good enough for standard copper ethernet?

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Uber Geek
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  Reply # 787035 26-Mar-2013 09:29
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Hi no you cannot maintain HF transmission line impedance with scotch locs, I have seen in the US a two conductor scotch loc that is designed to maintain the impedance of each pair and is Class D rated (ie 100MHz) but never seen them here.

I was under the impression that the OP was using these for some lower frequency telemetry purpose, hence scotch locs are fine, you can maintain reasonable performance to 20-30MHz is you keep untwist to a minimum as VDSL2 performance shows.


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Uber Geek
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  Reply # 787053 26-Mar-2013 10:22
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You could just terminate both to RJ45 wall sockets, then plug in a short patch lead between them. This give the advantage of later putting in a network switch should you in future put something in here that is IP.

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Ultimate Geek
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  Reply # 787079 26-Mar-2013 10:55
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Duct tape!

On a more serious note, those gel filled IDC's are great

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