CISCO IP Phone

anas-hazeen · ‎07-03-2010

Hi every one,

I have call manger 5 and alot of CISCO IP Phones. All phones work fine by Power over Ethernet PoE

Now, we have a office that is far from the main buliding about 185 m, I making LAN cable from Switch to Phone (about 190 m cable)

when tried to connect the CISCO IP Phone 7911, it gave "configuring IP" and after that gave "Disconnect ethernet"

Can any one tell me what is the problem ? and What is his suggestion to solve this ?

William Bell · ‎07-03-2010

Based on the specifications for Ethernet/Fast Ethernet over twisted pair, the commonly accepted maximum distance between an Ethernet transmitter and receiver is 100 meters. In my experience I have found that if you go much beyond that, you will have issues. With Fast Ethernet I have seen distances beyond 100 meters but 190 meters would be well outside of what I have seen work.

In your case, you are almost twice that maximum distance. You need to shorten that distance in some way. If you are dropping a single phone then placing a local switch wouldn't make much sense. There is a good thread on this exact topic here:

https://supportforums.cisco.com/message/501805#501805

If you have multiple phones in the location, then you may want to run a single fiber pair and put in a local switch.

HTH.

Regards,
Bill

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HTH -Bill (b) http://ucguerrilla.com (t) @ucguerrilla

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