[Asterisk-Users] Power over Ethernet (PoE) switch recommendations

Fri Apr 21 15:36:47 MST 2006

We've got the Linksys SRW224P here in the office, powering 5 Polycom
IP-501 phones with no problems or issues.  Bought it from
tigerdirect.ca (http://www.tigerdirect.ca/applications/searchtools/item-Details.asp?EdpNo=1815261&sku=L48-2460)
for about $450 after instant rebate (rebate no longer available it
seems).  It does 15 watts per port when using 12 ports, or 7.5 watts
per port when using all 24.  We've also got the PoE switch and
asterisk server running off of a 780 watt APC BX-1200N UPS ($200),
which gives us 30 minutes of run time after a power failure.

According to the Polycom knowledgebase
(http://eknowledge.polycom.com/SRVS/CGI-BIN/WEBCGI.EXE/,/?St=48,E=0000000000003886523,K=5531,Sxi=0,Case=obj(1240)),
it states the following regarding power requirements for the IP500
series phones:

"From the Cisco switch, the default inline power allocation per port
is 10.0 watts (0.24 amps @42V). The IP500CS will initially report to
the switch its power requirements and then use 4W.
The SoundPoint IP does support Phantom Power and does require the use
of the supplied Polycom cable."

So hopefully I should be fine on the Linksys switch with only 7.5
watts per port, if the Polycom's only use 4 watts (although I'm a bit
confused about the above statement, in regards to the "initial power
requirements" - not sure what will happen if these phones report a
higher power requirement than what my linksys switch will give them,
even though it seems they only require 4 watts).

Mike

On 4/21/06, Cory Andrews <Cory at voipsupply.com> wrote:
> The Edgewater Networks 2402 is affordable, supports IEEE 802.3af and will
> also power Cisco legacy phones.  Also does VLAN tagging and other L3 stuff.
> Here's a thumbnail
>
>     * Automated setup when used in conjunction with EdgeMarc and EdgeView
>     * 24 x 10/100 Mbps Autosensing Ethernet ports
>     * 2 x 10/100/1000 Mbps Autosensing, Ethernet uplinks or high speed
> server ports with RJ-45 or SFP Fiber connectors
>     * In-line Ethernet power (802.3af) with automatic power device detection
>     * In-line power for many legacy (non-802.3af) IP handsets
>     * Per port optional power sourcing
>     * Full wire-speed forwarding
>     * L2/L3/L4 traffic management
>     * 802.1Q VLAN support
>     * 802.1p based Quality of Service (QoS) with priority queuing
>     * Link aggregation (802.3ad)
>     * Complies with IEEE802.3, IEEE802.3u, IEEE802.3x and IEEE802.3af
>     * Broadcast storm control
>     * Management: integration with EdgeView NMS and support for SNMP, RMON,
> http, Telnet and DHCP
>
>
> Cory Andrews
> Executive Vice President
> ++++++++++++++++++
> VoIPSupply.com
> PBXSelect.com
> ++++++++++++++++++
> 454 Sonwil Drive
> Buffalo, NY 14225
> voice - 800.398.VoIP X3402
> fax - 716.630.1548
> e - Cory at VoIPSupply.com
> m - 716.907.4059
> aim - B2Cory
>
> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Kristian
> Kielhofner
> Sent: Friday, April 21, 2006 4:42 PM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [Asterisk-Users] Power over Ethernet (PoE) switch
> recommendations
>
> james.texter at cox.net wrote:
> > Hi listers, I am looking for people who have used Power over Ethernet
> > switches, primarily in conjunction with Polycom IP 501's.  I've been
> > looking at the Linksys SRW224P, since I've had good luck with the
> > SRW224 in our office.  However, Nortel, Cisco, Adtran, etc. all have
> > an offering, all of which vary in price.  I would appreciate any
> > input people have to offer.
> >
> > Thanks,
> >
> > James
> >
>
> First some comments on other posts -
>
>         Stay away from the D-Link switches.  The admin interface is
> horrible,
> and most only support PoE on half the ports.  Plus, most of their stuff
> comes configured with a static IP on varying RFC1918 networks -
> 192.168.3.1, 192.168.10.1, etc, etc.  Not a good idea.  Plus, in the
> $400+ price range they really should have a serial port.
>
>         I will never buy managed Netgear switches again.  I had two
> FSM7326Ps
> and the flash got corrupted several times, on both of them.  The web
> interface also had some serious reliability issues, sometimes causing
> the switch to reboot, which is of course totally unacceptable.
>
>         I have been happy with Cisco (anything), HP 2650s and the Linksys
> SRW224P (or whatever it is) for managed PoE.  If you have the money (but
> not ridiculous, Cisco money) go with the HP.  Better warranty, better
> interface, better support than Linksys or D-Link.  Plus, I think they
> give you full 75W per port, as opposed to the SRW224p which can only do
> half wattage on all of the ports or full wattage on half the ports
> (something like that).  It's late in the day (and the week), so you'll
> have to cut me some slack!
>
>         For the money, the Linksys can't be beat!
>
> --
> Kristian Kielhofner
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