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Joined: Feb 2009
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Is there a limit to the number of phones that can be connected to a single centrex line? I have Fire House that has 2 inbound centrex analog lines. There are 10+, two line phones in the house, all have L1 as the first and L2 as the second. There is sever enough crosstalk that 4 phones have to be disconnected for the circuit to be reliable.
Punch down is MPOE to 66-block looped then individual cross connects to 110-block to CAT5.
Any recommendations?
Don Roberts
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Moderator-Nortel, Computers, General
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Moderator-Nortel, Computers, General
Joined: Jun 2006
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Buy better quality 2-Line phones or better yet put in a system.
Scientists say that the universe is made up of Protons, Neutron & Electrons. They forgot "Morons".
Dave. (CTUB) Canadian Techs Use Bix!
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Joined: May 2007
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Moderator-1A2, Cabling
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Moderator-1A2, Cabling
Joined: May 2007
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Is it the same 4 phones or are you finding 6 phones is the maximum and it can be any 4?
Are all 10 phones the same brand? If so which one?
But really Dave is on the $. For 10+ phones you could use a real telephone system. Having an intercom would probably be nice too. Most firehouses I worked in also had a PA system. Being able to tie into that would also be a plus.
Sam
"Where are we going and why are we in this hand basket?"
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Joined: Jul 2005
Posts: 860
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Originally posted by drobertscor: Is there a limit to the number of phones that can be connected to a single centrex line? I have Fire House that has 2 inbound centrex analog lines. There are 10+, two line phones in the house, all have L1 as the first and L2 as the second. There is sever enough crosstalk that 4 phones have to be disconnected for the circuit to be reliable.
Punch down is MPOE to 66-block looped then individual cross connects to 110-block to CAT5.
Any recommendations? Yes... It's based off REN Ringer Equivalency Number. Somewhere where on the small print on the back/bottom of the phones there should be an alpha-numeric code for the REN. The numerics represent a ringer value and the total of all lines connected should not exceed 5 by a general rule. 10 phones… Without even knowing the REN is too many. As Sam and Dave have suggested, you’re really need to look in to a phone system for your ap there.
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Bryan
LEC Provisioning Engineer
Cars -n- Guitars Racin' (retired racer Oct.'07)
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Joined: Dec 2005
Posts: 9,181 Likes: 9
Spam Hunter
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Spam Hunter
Joined: Dec 2005
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Some older externally powered AT&T branded 2-line telephones (like the 962) have an REN of "0".
Still, a small business telephone system is the way to go.
I Love FEATURE 00
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Joined: May 2002
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Joined: May 2002
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An X16 XBlue system would be a nice fit for something like this.
As far as Xtalk. If you have quad wire rather than twisted wire that will cause Xtalk, especially on long runs.
Retired phone dude
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Joined: Sep 2005
Posts: 9,289 Likes: 15
Admin
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Admin
Joined: Sep 2005
Posts: 9,289 Likes: 15 |
Many of the non ksu phones are limited to not only the REN but also the total length of wire. Shorten all your cables to the minimum need length and make sure there are no unused runs connected. With that many phones you really should consider a small key system.
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