Nilesh Sawant wrote:
Hi,
I am observing the problem with 48 ports 3560G in LAN infrastructure. We have
alcatel IP phone which are connected to 3560G switches. Sometimes these IP
phone are not getting power up , after restarting the switch IP phone gets
power up. As per cisco theory it's deliver average 7.7w on all 48 ports or 15.4
w on 24 ports.
i tried shut, no shut after IP phones gets power down, also tries to allocate
10-14w power on that particular interface, but no use.
What could be the issue ?
Not sure about Alcatel, but we have seen a similar issue with some
Polycom phones. The Polycom phones have the capability of adding
"sidecar" units with additional display and buttons for DSS/BLF and the
like.
Even with no sidecars installed, the phones default to having the
sidecar power enabled and as such request the full 15.4 watts from the
switch. The Cisco switch will detect the requested power as 15.4 and
deny power to additional phones once the aggregate power limit is
reached based on this calculation.
A configuration setting on the phone allows one to disable sidecar power
and once this is done the phone requests a more reasonable six watts.
In this mode all ports can be used.
Keep in mind that TTBOMK power calculations in the switch are done by
layer 2 messages indicating desired power from the connected device and
not by an ammeter in the switch measuring actual power consumption.
Check your Alcatel phones and see if they are capable of powering
accessories that you aren't using. If so and you can disable this
capability the phones may then negotiate with the switch to deliver less
power and allow the use of more/all ports.
--
Jay Hennigan - CCIE #7880 - Network Engineering - j...@impulse.net
Impulse Internet Service - http://www.impulse.net/
Your local telephone and internet company - 805 884-6323 - WB6RDV
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