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Networked Phones
on: August 03, 2009, 16:52:51 PM
Anyone know much about Networking Phones?

I do all the electrical work for an office in the chester council offices and was asked to run a Cat5E from an office to the nearest server/rack thing.

Anyway I did it, following the routes of all the other cat5s.

Got a call from an IT bloke today asking how long the run was. It was pretty long and I looked in the box of Cat5 and recon I used about half so about 150m.

He recons these network phones wont work on a run longer than 90m and is moaning at me...

The point is all connected up and gets good speeds on the network/internet etc and there are Network Phones on the other points that I followed their route back to the rack.

Anyone got any idea what I should say to him?

Cheers
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  • Offline Bacon

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Re:Networked Phones
Reply #1 on: August 03, 2009, 17:29:42 PM
Quote
10BASE-T (10 Mbit/s, baseband, twisted-pair) - this is colloquially known as twisted-pair ethernet and is the recommended local area network technology for new installations. It supports a segment length of 100 metres of which 90 metres should normally be allowed for fixed wiring and 10 metres for fly-leads.


Think he is quoting text book. And hes not wrong, but im no expert i just used google :P

My response to him would be do it yourself mate :P
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Re:Networked Phones
Reply #2 on: August 03, 2009, 18:56:52 PM
2x 100m lengths with a coupler/joiner/extender in the middle.

Just tell him you followed the existing cabling, so if yours is wrong, then so are the rest.
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Networked Phones
Reply #3 on: August 03, 2009, 20:27:18 PM
also.... where does he expect you to plug it in ?
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  • Offline Mark

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Re:Networked Phones
Reply #4 on: August 03, 2009, 22:02:11 PM
what sort of phones?

Cisco phones will NOT work properly with long cables - they will constantly reset at random intervals. Nortel ones are as bad, if not worse.

Because of the PoE, you MUST pay extra special attention to the book figures. Unless the phones are powered by power bricks, you need to keep the runs as short as possible.

802.3af is a funny old standard, and very fussy on cabling.
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Re:Networked Phones
Reply #5 on: August 03, 2009, 23:32:51 PM
Siemens phones I think.

So if the run is 150m, what are my options? is there such a thing as a booster or somthing?
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Re:Networked Phones
Reply #6 on: August 03, 2009, 23:51:49 PM
Quote from: DEViANCE
Siemens phones I think.

So if the run is 150m, what are my options? is there such a thing as a booster or somthing?


There are repeaters, but a powered switch/hub would do the same job, basically something that takes in the signal and sends it out again along the other cable.
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  • Offline Mark

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Re:Networked Phones
Reply #7 on: August 04, 2009, 00:58:19 AM
poe injectors near the phone, or power supplies.

or multiport injectors - or poe switches near the phones
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  • Offline Cypher

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Re:Networked Phones
Reply #8 on: August 04, 2009, 12:05:02 PM
I thought CAT-5 UTP was only good for 100m anyway before signal degredation kicked in?
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  • Offline Rivkid

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Re:Networked Phones
Reply #9 on: August 05, 2009, 13:57:59 PM
Think Marks got this right - 150m is too long IMO for a reliable connection for a Cisco phone. If your network connections are stable (tested over a period of sustained data transfer not just a few pings) then you might be ok with POE injectors or just using the power cubes. Ideally though youd reduce that distance - Id be tempted to either do as Mark says and put PoE switches by the phones, or just bridge the connection halfway with a cheap standard switch and then use PoE injectors/power cubes.

Cypher - Ive always used 100m as the maximum for a solid cable connection too.

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Re:Networked Phones
Reply #10 on: August 08, 2009, 13:38:21 PM
I havent heard off him since so I guess he is sorting out himself.

When he first called me I did ask him about installing a switch nearer to the office as the run was very long and there was a possibility of having to run more points in the future but he just laughed it off at the time , "what would an electrician know about networks" I think where his words LOL  :w00t:  8-)
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  • Offline Rivkid

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Re:Networked Phones
Reply #11 on: August 08, 2009, 23:46:38 PM
Quote from: DEViANCE
I havent heard off him since so I guess he is sorting out himself.

When he first called me I did ask him about installing a switch nearer to the office as the run was very long and there was a possibility of having to run more points in the future but he just laughed it off at the time , "what would an electrician know about networks" I think where his words LOL  :w00t:  8-)



hahaha serves him f*cking right then silly tw@t!!
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