What wires in Ethernet cabling are used for what?

[david.cate]

What wires in an Ethernet Cable are used for what with a CP-8841 phone? I have one phone that will not connect to the Call Manager. I ran a trace on the line and found that wire 6 on the Ethernet cable we're using is broken at some point. I can successfully connect a laptop to the network using this same cable, but not the phone.

Can someone give me this information please?

Thank you in advance.

[Leo Laohoo]

What is the exact model of the switch the phone is connected to?

[Jonathan Schulenberg]

All eight wires are required to function. In 1000Base-T all eight pins support both data transmit/receive as well as power. In 10/100Base-T pins 1,2,3 and 6 carry data while 4,5,7 and 8 carry power (assuming 802.3af Alternative B).

[Abhay Singh Reyal]

What do you mean by the statement which states, phone will not connect to the call manager ?

Are you not able to register the phone or not able to connect the phone to the switch port ?

Is the phone getting an IP address from DHCP if enabled after connecting it to the switch ?

This phone model supports an internal 2-port Cisco Ethernet switch allows for a direct connection to a 10/100/1000BASE-T Ethernet network (IEEE 802.3i/802.3u/802.3ab) through a RJ-45 interface with single LAN connectivity for both the phone and a co-located PC.

Regards

Abhay