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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Alarms, Phones, Aerials, CCTV & Datacomms >> patch panel https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1327089142 Message started by scotspark on Jan 20^th, 2012, 7:52pm

Title: patch panel
Post by scotspark on Jan 20^th, 2012, 7:52pm

I was working in an office that a client has just taken over

this is the wiring in the existing patch panels.

[album]scotspark&1327089165[/album]

Title: Re: patch panel
Post by Lectrician on Jan 20^th, 2012, 8:02pm

Looking at the pics, they have only punched down two selected pairs.

Is there other patch panels in the rack which are fully punched?

This patch could be just the 'voice' patch which is 'presenting' the telephone extensions to the rack from the PBX CCU ready to patch to 'the floor'.

Digital PBX's only use a single pair for system telephones and SLT telephones. Hybrid PBX's require two pairs for system telephones, and a single pair for SLT telephones.

Title: Re: patch panel
Post by CWatters on Jan 21^st, 2012, 9:58am

Your camera is upside down :-)

Title: Re: patch panel
Post by scotspark on Jan 21^st, 2012, 2:54pm

no 1 double batch panel

48 ways 36 used all just with 2 pairs punched

they are all terminated correctly at the rj45 plates throughout offices

any telephones running through the structured cabling normally still use standard connections and plate with adaptor at the point

Title: Re: patch panel
Post by Lectrician on Jan 21^st, 2012, 3:51pm

Usually you will have patch panels fully punched for the points in the offices (known as 'the floor'), and a seperate patch panel which comes FROM the telephone PBX CCU, so port 1 will be ext1, port 2 will be ext2 etc. You then patch from the PBX patch to the floor patch.

You can get 'telephone' patches designed especially for it and they are cheaper, but many people just use normal patches.

When cat5e first came out they did often only patch down the two pairs required for TCP/IP - a pair for sending and a pair for recieving. Often they would use a single cat5e cable for a dual port! The problem with this is that while it works fine for normal cat5e 10/100/1000, it does not work with many comms devices, and doesn't support power over ethernet (used by IP telephone, wifi access points etc) which uses the two other pairs for 48v DC power.

Title: Re: patch panel
Post by scotspark on Jan 21^st, 2012, 5:43pm

its all double points but a cable for each

Title: Re: patch panel
Post by Lectrician on Jan 21^st, 2012, 6:32pm

scotspark wrote on Jan 21^st, 2012, 5:43pm:

its all double points but a cable for each

Yea, if they had used one cable for a double point, the other two pairs would be punched down on the the next patch panel way.

Title: Re: patch panel
Post by scotspark on Jan 21^st, 2012, 11:16pm

Dont get why they didnt just punch down the 4 pairs

I also hate it when they only connect 2 or 3 wires at a phone point ! Why not punch down the 3 pairs into the appropriate terminals?

Different if you are using those cores for a second line or something but generally they ate just coiled in box