Re: [AFMUG] SAF POE/Fiber question
Some of the SAF units are polarity agnostic, but I'm not sure which ones.
Daniel?
bp
part15sbs{at}gmail{dot}com
On 5/26/2015 10:59 AM, Ken Hohhof wrote:
One thing, I think this P/N might be for -48V polarity only. Does SAF
use -48 or +48?
Re: [AFMUG] SAF POE/Fiber question
FWIW, when we installed a Purewave basestation a couple years ago, they recommended a Connectronics P/N 82-8694 protector for the 48V DC, which we used at the top next to the basestation. While expensive, it's pretty nice, even has a light to tell you power is on. And since it's a little outdoor enclosure with glands, you could use it to transition from 2-wire power cable to Cat5 with an RJ45 on the end. We just used 12 AWG electrical wire up the tower since it was inside conduit. Then tray cable to the special DC connector the Purewave gear required. http://www.connectronics.com/dealer/SolutionGuides/PoEProducts.pdf One thing, I think this P/N might be for -48V polarity only. Does SAF use -48 or +48? -Original Message- From: Craig Baird Sent: Tuesday, May 26, 2015 12:44 PM To: af@afmug.com Subject: [AFMUG] SAF POE/Fiber question I've got a few SAF Integra links that we'll be doing shortly. We're planning to run fiber to the radios. I'm wondering what's the best method for powering the radios? From what I gather, SAF has some sort of new kit where you can send power up to the radio on 2-wire DC cable. At the top, near the radio, there is a pigtail that takes power off the 2-wire cable, and puts it on another cable with an RJ-45 for plugging into the ethernet port on the radio. I have a couple of issues with this method. First of all, it appears they use a Bulgin outdoor coupler to make the transition from 2-wire cable to CAT5 cable. I've found those Bulgin couplers to be less than reliable over the long term with regard to water ingress. So that makes me nervous. My second issue is lightning protection over the DC cable. I'm sure there are products that are designed to protect DC circuits. What would you guys recommend for protecting a DC circuit running up the tower? Overall, I'm wondering what would be wrong with just running shielded CAT5e up to the radio for power purposes only? If we did that, we could just use the WB surge protectors. Is there some advantage to running 2-wire vs. CAT5 that I'm not seeing? Craig
Re: [AFMUG] SAF POE/Fiber question
CFIP Lumina definitely
Integra dunno
Josh Luthman
Office: 937-552-2340
Direct: 937-552-2343
1100 Wayne St
Suite 1337
Troy, OH 45373
On Tue, May 26, 2015 at 2:10 PM, Bill Prince part15...@gmail.com wrote:
Some of the SAF units are polarity agnostic, but I'm not sure which ones.
Daniel?
bp
part15sbs{at}gmail{dot}com
On 5/26/2015 10:59 AM, Ken Hohhof wrote:
One thing, I think this P/N might be for -48V polarity only. Does SAF
use -48 or +48?
Re: [AFMUG] SAF POE/Fiber question
Integras should take poe directly On 5/26/15, 1:44 PM, Craig Baird cr...@xpressweb.com wrote: I've got a few SAF Integra links that we'll be doing shortly. We're planning to run fiber to the radios. I'm wondering what's the best method for powering the radios? From what I gather, SAF has some sort of new kit where you can send power up to the radio on 2-wire DC cable. At the top, near the radio, there is a pigtail that takes power off the 2-wire cable, and puts it on another cable with an RJ-45 for plugging into the ethernet port on the radio. I have a couple of issues with this method. First of all, it appears they use a Bulgin outdoor coupler to make the transition from 2-wire cable to CAT5 cable. I've found those Bulgin couplers to be less than reliable over the long term with regard to water ingress. So that makes me nervous. My second issue is lightning protection over the DC cable. I'm sure there are products that are designed to protect DC circuits. What would you guys recommend for protecting a DC circuit running up the tower? Overall, I'm wondering what would be wrong with just running shielded CAT5e up to the radio for power purposes only? If we did that, we could just use the WB surge protectors. Is there some advantage to running 2-wire vs. CAT5 that I'm not seeing? Craig
Re: [AFMUG] SAF POE/Fiber question
As you mentioned, the connector housing are less than waterproof. Having
said that, we cut off the provided screw terminal and use watertight crimp
connectors that solder the butt splice when heat is applied to shrink and
seal them. Since we made that modification we had no issues and new
deployments were made that way ever since.
I preferred using non POE surge arrestors since it seems they can be
designed to clamp faster since there is no (or not much) voltage
fluctuation on the line. We had a combination SAD/MOV to try and take
advantage of the quick rise time of the SAD and the higher voltage capacity
of the MOV. I am sure Chuck will inform us why this wouldn't work but we
did it anyway. I would rather have had a Chuck solution but to m knowledge
there wasn't and isn't one.
At any rate, I liked separating the protection from the data and we used a
14 AWG pair to deliver it with the lightening protection only on the
bottom. The protectors had latched remote monitoring output we could
monitor but I am pretty sure that it wasn't 100% reliable. I remember one
case specifically where the surge arrestor did its job and blew but the
indicator didn't trip. Luckily we had more on the truck.
On Tue, May 26, 2015 at 1:42 PM, Daniel White afmu...@gmail.com wrote:
The attached drawing is an internal one, but since the radio is native PoE
it is not polarity agnostic.
Regarding the gland, we have used these in various forms since 2009 and
never had issues with water ingress unless they are not mounted vertically.
But I would recommend running shielded CAT5e and using it for out of band
management. Then if the fiber cable gets cut, you can switch to in-band
management.
***
Daniel White - Managing Director
SAF North America LLC
Cell: +1 (303) 746-3590
daniel.wh...@saftehnika.com
Skype: danieldwhite
Social: LinkedIn
***
-Original Message-
From: Af [mailto:af-boun...@afmug.com] On Behalf Of Bill Prince
Sent: Tuesday, May 26, 2015 12:10 PM
To: af@afmug.com
Subject: Re: [AFMUG] SAF POE/Fiber question
Some of the SAF units are polarity agnostic, but I'm not sure which ones.
Daniel?
bp
part15sbs{at}gmail{dot}com
On 5/26/2015 10:59 AM, Ken Hohhof wrote:
One thing, I think this P/N might be for -48V polarity only. Does SAF
use -48 or +48?
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