...hence, the current reality.
Thanks,
. . . J o n a t h a n
-Original Message-
From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On
Behalf Of Jeremy Parr
Sent: Thursday, March 18, 2010 8:19 PM
To: WISPA General List
Subject: Re: [WISPA] -48vdc Gigabit switch
On 18
On 18 March 2010 19:26, Tom DeReggi wrote:
> While on the subject Anyone know why the concept of positive ground
> was
> implimented? What was accomplished by not doing negative ground like
> everything else typically does?
>
My understand is that a negative ground outside copper plant will
J o n a t h a n
-Original Message-
From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On
Behalf Of Tom DeReggi
Sent: Thursday, March 18, 2010 6:26 PM
To: WISPA General List
Subject: Re: [WISPA] -48vdc Gigabit switch
While on the subject Anyone know why the concept of p
-4589
++
--
From: "Cameron Crum"
Sent: Thursday, March 18, 2010 11:48 AM
To: ; "WISPA General List"
Subject: Re: [WISPA] -48vdc Gigabit switch
> You could always reverse the leads for a +48 switch or pull 12v or 24v
> off one or two of the batteries.
&
From: "Jeremy Parr"
To: "WISPA General List"
Sent: Thursday, March 18, 2010 3:11 PM
Subject: Re: [WISPA] -48vdc Gigabit switch
> On 18 March 2010 14:48, Cameron Crum wrote:
>
>> You could always reverse the leads for a +48 switch or pull 12v or 24v
>> off one or
gt;
>>>> Nick Olsen
>>>> Network Engineer / Customer Support
>>>> (321) 205-1100 x106
>>>>
>>>>
>>>>
>>>> --
>>>> *From*: "Roger Howard"
>>>> *Sent*: Thur
Point taken. I've ever tried attaching anything but a small switch and
it's always worked out.
On 3/18/2010 1:11 PM, Jeremy Parr wrote:
> On 18 March 2010 14:48, Cameron Crum wrote:
>
>
>> You could always reverse the leads for a +48 switch or pull 12v or 24v
>> off one or two of the batteri
t;>> and 8 port respectively) Can be powered by POE, If that is a option for you.
>>> I think its around $400.
>>>
>>> Nick Olsen
>>> Network Engineer / Customer Support
>>> (321) 205-1100 x106
>>>
>>>
>>>
>>>
On 18 March 2010 14:48, Cameron Crum wrote:
> You could always reverse the leads for a +48 switch or pull 12v or 24v
> off one or two of the batteries.
>
No no no, *DO NOT* do this! -48vdc, but its very nature, is positive ground.
If you plug in a +48vdc device with the polarity reversed it will
;>>
>>>
>>> ----------
>>> *From*: "Roger Howard"
>>> *Sent*: Thursday, March 18, 2010 1:20 PM
>>> *To*: "WISPA General List"
>>> *Subject*: [WISPA] -48vdc Gigabit switch
>>>
>>
t; Network Engineer / Customer Support
>> (321) 205-1100 x106
>>
>>
>>
>> --
>> *From*: "Roger Howard"
>> *Sent*: Thursday, March 18, 2010 1:20 PM
>> *To*: "WISPA General List"
>> *Subject*: [WISPA] -48vdc Gigabit switch
&g
From: "Roger Howard"
Sent: Thursday, March 18, 2010 1:20 PM
To: "WISPA General List"
Subject: [WISPA] -48vdc Gigabit switch
Anyone heard of a gigabit switch that runs on -48vdc that doesn't cost
an arm and a leg? Only need a few ports, 8-16 would do. prefera
Anyone heard of a gigabit switch that runs on -48vdc that doesn't cost
an arm and a leg? Only need a few ports, 8-16 would do. preferably
rackmountable.
I can find plenty of inexpensive gigabit switches, but they normally
don't list their power supply voltage, or they list 110v
Another option is
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