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04-01-2012 05:26 PM
04-01-2012 05:26 PM
Cisco 7940 on HP5406 PoE
I have just installed 3 x HP 5406 with POE. It seems the cisco 7940 phones won't work with the pre-standard PoE.
Has anyone had this issue?
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04-02-2012 11:36 AM
04-02-2012 11:36 AM
Re: Cisco 7940 on HP5406 PoE
It has been tested and should work, make sure that on the switch "pre-standard detect" is on (it is usually on by default)
power pre-std-detect
Good luck
-RK
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04-03-2012 04:25 PM
04-03-2012 04:25 PM
Re: Cisco 7940 on HP5406 PoE
Pre standard is on.
I have read that on the earlier Cisco 7940 phones the polarity is reversed for PoE as opposed to what Pre standard supports. ie on the early 7940 (and 7960) pair 4 and 5 neg pair 7 and 8 positive whereas pre standard supports pair 4 and 5 pos pair 7 and 8 neg.