[rescue] Looking for a few used cisco 7940 phones
rdarlington at gmail.com
Tue Nov 27 16:17:09 CST 2007
Just an FYI, at least for the 7960, you can download and install newer
firmware that supports SIP (which is what mine uses).
On Nov 27, 2007 2:39 PM, Raynetman <kray at netdigitalonline.com> wrote:
> To all:
> This Cisco PoE thing is not simple and they have their reasons for it. The
> 7940 & 7960 (with or without the G) are using Cisco labeled "Pre-Standard"
> PoE. This means that the wires in pairs 3 & 4 of the Ethernet cables are
> reversed and carry the power for the phones. They created this Pre before
> the industry had actually settled on the 802.11af standard. You can create
> cable to reverse this and they will work just fine as long as the PoE switch
> has enought power on each port.
> Also, the newer 7941s and 7961s support both methods. These newer Cisco
> Phones have a little higher resolution screen, but no new features. The list
> prices are $80 higher per phone and up until a couple of months ago, there
> was no confirmation of a schedule for these phones to support SIP. That
> means SCCP only unless you are connected to a GenBand(Tekelec) M6 switch.
> Also, with the newer Cisco 7941, 7961 and 7970, you need to be careful
> buying 3rd party power cubes. The socket on the phones are deeper by maybe
> 1/4 inch and the Cube 2 will not work. Make sure that you are buying the
> Cube 3 equivalent which has a longer shaft.
> kray at netdigitalonline.com
> Patrick Giagnocavo 717-201-3366 wrote:
> > On Nov 25, 2007, at 6:34 PM, Phil Brutsche wrote:
> >> dspan vs endspan thing.
> >> If it's modern and supports PoE, it uses 802.3af. Only Cisco would
> >> have
> >> the gall to create something non-standard.
> > To be fair to Cisco, they may have had the VOIP phones shipping
> > before a standard was in place...
> > Cordially
> > Patrick Giagnocavo
> > patrick at zill.net
> > _______________________________________________
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