Perhaps this information could be of some use. Though Robert did give some great detailed information on the subject.<br><br><a href="http://www.cisco.com/en/US/products/hw/switches/ps5023/products_qanda_item09186a00801b0971.shtml" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
http://www.cisco.com/en/US/products/hw/switches/ps5023/products_qanda_item09186a00801b0971.shtml</a><br><br><font face="Arial"><b>Q.</b></font> How does Power Management work in the Cisco Catalyst 3750 PoE switches?<span>
<a name="114ad6d31167b87c_wp9000505"></a>
<div style="margin: 0pt 0pt 7pt 18pt; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; text-indent: -18pt; text-transform: none;"><font face="Arial"><b>A.</b></font>
The Cisco Catalyst 3750-24PS switch supports a maximum of 15.4W per
port of -48V DC power on all 24 ports over standard Category 3 and 5
unshielded twisted-pair (UTP) cable up to 100 meters, <span style="font-weight: bold;">however all 48
10/100 ports in Cisco Catalyst 3750-48PS switch will be able to deliver
7.7W simultaneously</span> and any given port can be configurable to support
up to the maximum of 15.4 watts as long as the switch's - 48V power
capacity is not exceeded. The Cisco Catalyst 3750 PoE switches monitor
and track the requests for power, and only grants power when it is
available. If the connected PD draws more power, which results in
exceeding the system power budget that is available on the switch, then
power will be denied to that port and the PD will not power up. If
power is denied, the switch re-checks the power budget periodically
(every 15 seconds), and continues to attempt to grant the request for
power. If power is granted, the switch updates the power budget.
Additional power management features are described later in this
section.</div></span><br>Anthony<br><br><div><span class="gmail_quote">On 8/24/07, <b class="gmail_sendername">Pennington, Craig</b> <<a href="mailto:cpennington@ncaa.org">cpennington@ncaa.org</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div>
<div><span><font face="Arial" size="2">I noticed we have
reached our maximum power output for the 3750 (540 watts). I then noticed
it is set to the default settings of auto with 15.4 watts max on a port with the
switch reporting each 7970 as using 10.3 watts. I tried to do the power
inline auto max XXXXX (where XXXXX is the number of milli-watts between 4000 and
15400) to lower the max setting in hopes of increasing the number of ports that
would give power. 540/15.4 gives you a max of 35 powered ports. And
that is what I have, 35 phones, on each switch and I need to add more.
When I tried to lower the milli-watts below 15400 the port would say deny power
and the phone would not boot. has anyone had any luck trying to lower the
power on a 3750 to service more 7970's?</font></span></div>
<div><span><font face="Arial" size="2"></font></span> </div>
<div><span>
<div align="left">
<div align="left"><font face="Arial" size="2">Craig Pennington<br>Network
Engineer<br><strong>N</strong>ational <strong>C</strong>ollegiate
<strong>A</strong>thletic <strong>A</strong>ssociation<br>Fax:
317-917-6888<br></font><a title="mailto:cpennington@ncaa.org" href="mailto:cpennington@ncaa.org" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)"><font title="mailto:cpennington@ncaa.org" face="Arial" size="2">
cpennington@ncaa.org</font></a><br><a title="http://www.ncaa.org/" href="http://www.ncaa.org/" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)"><font title="http://www.ncaa.org/" face="Arial" size="2">
www.ncaa.org</font></a></div></div></span></div>This email and any attachments may contain confidential and privileged information. If you are not the intended recipient, please notify the sender immediately by return email, delete this message and destroy any copies. Any dissemination or use of this information by a person other than the intended recipient is unauthorized and may be illegal.
</div>
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