Re: [AFMUG] [WISPA Members] To Cambium With Love - Replace the bad ePMP units.

[Tyson Burris @ Internet Communications Inc]

Forrest,

 

Thank you for your research.  My theory was increased power consumption during 
the cold weather.  The units can be moved to the sync injectors once the temps 
get around 30+ and they work normally at that point.

 

Tyson Burris, President 
Internet Communications Inc. 
739 Commerce Dr. 
Franklin, IN 46131 
  
317-738-0320 Daytime # 
317-412-1540 Cell/Direct # 
Online: www.surfici.net 

 



What can ICI do for you? 


Broadband Wireless - PtP/PtMP Solutions - WiMax - Mesh Wifi/Hotzones - IP 
Security - Fiber - Tower - Infrastructure. 
  
CONFIDENTIALITY NOTICE: This e-mail is intended for the 
addressee shown. It contains information that is 
confidential and protected from disclosure. Any review, 
dissemination or use of this transmission or its contents by 
unauthorized organizations or individuals is strictly 
prohibited. 

 

From: members-boun...@wispa.org [mailto:members-boun...@wispa.org] On Behalf Of 
Forrest Christian (List Account)
Sent: Thursday, January 21, 2016 4:44 AM
To: af 
Cc: memb...@wispa.org
Subject: Re: [WISPA Members] [AFMUG] To Cambium With Love - Replace the bad 
ePMP units.

 

I do want to clarify one item:

This is not necessarily related to the cambium DRAM issue.   I don't want to 
claim that problem, since this isn't the same thing.   This is more of an issue 
where you have ePMP's which seem to start having power-related issues.   If 
moving to a 30V brick makes your problem go away, then the issue I describe 
below probably is your issue.  If moving to a higher voltage doesn't fix the 
issue then this probably doesn't relate to your issue.  Regardless, it is my 
intent to recommend that my customers move to 48V as soon as I confirm that 
this seems to fix at least a decent number of the problems without causing 
others.

Unfortunately this might be a case of the cold weather aggravating two separate 
issues (or for that matter, the cold weather causing increased current 
consumption in the ePMP, which then requires a higher voltage to operate 
correctly).

-forrest

 

On Thu, Jan 21, 2016 at 12:43 AM, Forrest Christian (List Account) 
 > wrote:

A bit of an update from the PacketFlux side.

Late this afternoon I received a ticket from Tyson in relation to these issues. 
 In particular, sync from a PacketFlux SyncInjector dropping off on an ePMP 
when it's cold.  I have spent a bit of time this evening investigating this 
issue.  The following is a summary of what I found.  It's a bit long-winded so 
that those experiencing the problems can understand my current working theory 
and help me figure out if this is the case.

WARNING:  The following is based on a limited amount of testing with a single 
ePMP with no traffic and no clients and on a bench.   This is likely the best 
case scenario.  The field is only going to be worse.

The setup is as follows:

ePMP 1000 GPS AP, with no GPS hockey puck attached, connected to a Gigabit 
Syncinjector (Rev H and Rev I - I have a special one with a port of each 'type' 
;-) ).   I am powering the injector with a variable power supply so I can vary 
the voltages in.  The AP is connected to the Injector with ~100m of CAT5 cable. 
  The Antenna connectors have terminators on them, the AP is in transmit mode, 
but isn't passing any traffic since there are no clients.

When feeding the injector with 24V, I get about 23V at the AP.   This is pretty 
consistent with what I would expect in this situation.   The AP seems to work 
fine, at least on the bench and without doing any real work.   However, as the 
voltage drops, things start to get weird:

At around 22V in, (21V at the AP), Sync becomes flaky.  This is consistent on 
both H and I version ports on the injector.Sometimes it works, sometimes it 
doesn't.   Note that 22V is the bottom of the rated voltage inputs for the ePMP.

At around 20.5V in (19.5V at the AP), the radio just turns off.   It won't turn 
back on until around 22V.   

Now here's where some total speculation comes to play.   On the bench, this 
unit is drawing around 3W.  Let's assume that under load, and when temperatures 
are cold, this unit draws closer to 6W.  This would double the current, and 
quadruple the voltage drop.  Now, assume 24V in, this puts you at around 20V in 
at the AP, which is about the turnoff point.   Remember this is on 100m of 
wire, and a total speculation about a the power draw of a cold, under load AP.  
But the point is valid, regardless of the cause - if the circuit resistance 
when combined with the power load causes a low enough voltage at the AP, weird 
things will happen.  And since weird things seem to start to happen around 22V, 
there just isn't much headroom at 24V.   

This explains why things work well at 30V.

For those who are having this problem I'd recommend trying increasing the 
voltage into the SyncInjector.   The Revision H injectors can safely handle up 
to around 56V or so.   Assuming 

Re: [AFMUG] [WISPA Members] To Cambium With Love - Replace the bad ePMP units.

[Josh Luthman]

CPU and memory are obviously tied together.  I believe the rate at which
the gate is opened/closed was sped up to fix the issue.

I also don't think CPU/memory are limiting factors on the radios to begin
with...


Josh Luthman
Office: 937-552-2340
Direct: 937-552-2343
1100 Wayne St
Suite 1337
Troy, OH 45373

On Wed, Jan 20, 2016 at 2:08 PM, Tyson Burris @ Internet Communications Inc
 wrote:

> Josh,
>
>
>
> I heard cpu clock is being messed with.  (you know … rumors)
>
>
>
> *Tyson Burris, President*
> *Internet Communications Inc.*
> *739 Commerce Dr.*
> *Franklin, IN 46131*
>
> *317-738-0320 <317-738-0320> Daytime #*
> *317-412-1540 <317-412-1540> Cell/Direct #*
> *Online: **www.surfici.net* 
>
>
>
> [image: ICI]
>
> *What can ICI do for you?*
>
>
> *Broadband Wireless - PtP/PtMP Solutions - WiMax - Mesh Wifi/Hotzones - IP
> Security - Fiber - Tower - Infrastructure.*
>
> *CONFIDENTIALITY NOTICE: This e-mail is intended for the*
> *addressee shown. It contains information that is*
> *confidential and protected from disclosure. Any review,*
> *dissemination or use of this transmission or its contents by*
> *unauthorized organizations or individuals is strictly*
> *prohibited.*
>
>
>
> *From:* members-boun...@wispa.org [mailto:members-boun...@wispa.org] *On
> Behalf Of *Josh Luthman
> *Sent:* Wednesday, January 20, 2016 1:11 PM
> *To:* af@afmug.com
> *Cc:* memb...@wispa.org
> *Subject:* Re: [WISPA Members] [AFMUG] To Cambium With Love - Replace the
> bad ePMP units.
>
>
>
> Why would making the memory faster degrade performance?
>
>
>
>
> Josh Luthman
> Office: 937-552-2340
> Direct: 937-552-2343
> 1100 Wayne St
> Suite 1337
> Troy, OH 45373
>
>
>
> On Wed, Jan 20, 2016 at 1:00 PM, Tyson Burris @ Internet Communications
> Inc  wrote:
>
> Hello Cambium,
>
>
>
> At the MidWest-IX launch party last night, several of us Indiana WISPs
> compared notes on the ‘cold weather’ problems we are seeing with ePMPs.  It
> was very interesting to learn we are experience identical problems across
> the spectrum.
>
> We all understand this is a DRAM issue with certain units you have
> identified.  We also understand the firmware RC that has been made
> available to fix this short term.
>
> The bottom line is we are very frustrated and grow tired of dealing with
> it.
>
>
>
> Our concern is simple.  If your software fix ‘degrades’ the performance of
> the product or triggers other issues, as it has been suggested, we would
> prefer a full recall and replacement program immediately.
>
>
>
> If the suggestion that the fix will degrade the product performance is
> inaccurate and not cause other issues, I would like for this to be made
> public.
>
>
>
> Thank you,
>
>
>
> *Tyson Burris, President*
> *Internet Communications Inc.*
> *739 Commerce Dr.*
> *Franklin, IN 46131*
>
> *317-738-0320 <317-738-0320> Daytime #*
> *317-412-1540 <317-412-1540> Cell/Direct #*
> *Online: **www.surfici.net* 
>
>
>
> [image: ICI]
>
> *What can ICI do for you?*
>
>
> *Broadband Wireless - PtP/PtMP Solutions - WiMax - Mesh Wifi/Hotzones - IP
> Security - Fiber - Tower - Infrastructure.*
>
> *CONFIDENTIALITY NOTICE: This e-mail is intended for the*
> *addressee shown. It contains information that is*
> *confidential and protected from disclosure. Any review,*
> *dissemination or use of this transmission or its contents by*
> *unauthorized organizations or individuals is strictly*
> *prohibited.*
>
>
>
>
>

Re: [AFMUG] [WISPA Members] To Cambium With Love - Replace the bad ePMP units.

[Tyson Burris @ Internet Communications Inc]

Josh,

 

I heard cpu clock is being messed with.  (you know … rumors)

 

Tyson Burris, President 
Internet Communications Inc. 
739 Commerce Dr. 
Franklin, IN 46131 
  
317-738-0320 Daytime # 
317-412-1540 Cell/Direct # 
Online: www.surfici.net 

 



What can ICI do for you? 


Broadband Wireless - PtP/PtMP Solutions - WiMax - Mesh Wifi/Hotzones - IP 
Security - Fiber - Tower - Infrastructure. 
  
CONFIDENTIALITY NOTICE: This e-mail is intended for the 
addressee shown. It contains information that is 
confidential and protected from disclosure. Any review, 
dissemination or use of this transmission or its contents by 
unauthorized organizations or individuals is strictly 
prohibited. 

 

From: members-boun...@wispa.org [mailto:members-boun...@wispa.org] On Behalf Of 
Josh Luthman
Sent: Wednesday, January 20, 2016 1:11 PM
To: af@afmug.com
Cc: memb...@wispa.org
Subject: Re: [WISPA Members] [AFMUG] To Cambium With Love - Replace the bad 
ePMP units.

 

Why would making the memory faster degrade performance?




 

Josh Luthman
Office: 937-552-2340
Direct: 937-552-2343
1100 Wayne St
Suite 1337
Troy, OH 45373

 

On Wed, Jan 20, 2016 at 1:00 PM, Tyson Burris @ Internet Communications Inc 
 > wrote:

Hello Cambium,

 

At the MidWest-IX launch party last night, several of us Indiana WISPs compared 
notes on the ‘cold weather’ problems we are seeing with ePMPs.  It was very 
interesting to learn we are experience identical problems across the spectrum. 

We all understand this is a DRAM issue with certain units you have identified.  
We also understand the firmware RC that has been made available to fix this 
short term.

The bottom line is we are very frustrated and grow tired of dealing with it.  

 

Our concern is simple.  If your software fix ‘degrades’ the performance of the 
product or triggers other issues, as it has been suggested, we would prefer a 
full recall and replacement program immediately.

 

If the suggestion that the fix will degrade the product performance is 
inaccurate and not cause other issues, I would like for this to be made public. 
 

 

Thank you,

 

Tyson Burris, President 
Internet Communications Inc. 
739 Commerce Dr. 
Franklin, IN 46131 
  
317-738-0320   Daytime # 
317-412-1540   Cell/Direct # 
Online:   www.surfici.net 

 



What can ICI do for you? 


Broadband Wireless - PtP/PtMP Solutions - WiMax - Mesh Wifi/Hotzones - IP 
Security - Fiber - Tower - Infrastructure. 
  
CONFIDENTIALITY NOTICE: This e-mail is intended for the 
addressee shown. It contains information that is 
confidential and protected from disclosure. Any review, 
dissemination or use of this transmission or its contents by 
unauthorized organizations or individuals is strictly 
prohibited. 

 

 

Re: [AFMUG] [WISPA Members] To Cambium With Love - Replace the bad ePMP units.

[Mathew Howard]

I can't imagine a minor change in CPU/memory performance is going to have
any real effect on throughput... if it was a huge change, maybe, but I
don't believe that's the case.

On Wed, Jan 20, 2016 at 1:20 PM, Josh Luthman 
wrote:

> CPU and memory are obviously tied together.  I believe the rate at which
> the gate is opened/closed was sped up to fix the issue.
>
> I also don't think CPU/memory are limiting factors on the radios to begin
> with...
>
>
> Josh Luthman
> Office: 937-552-2340
> Direct: 937-552-2343
> 1100 Wayne St
> Suite 1337
> Troy, OH 45373
>
> On Wed, Jan 20, 2016 at 2:08 PM, Tyson Burris @ Internet Communications
> Inc  wrote:
>
>> Josh,
>>
>>
>>
>> I heard cpu clock is being messed with.  (you know … rumors)
>>
>>
>>
>> *Tyson Burris, President*
>> *Internet Communications Inc.*
>> *739 Commerce Dr.*
>> *Franklin, IN 46131*
>>
>> *317-738-0320 <317-738-0320> Daytime #*
>> *317-412-1540 <317-412-1540> Cell/Direct #*
>> *Online: **www.surfici.net* 
>>
>>
>>
>> [image: ICI]
>>
>> *What can ICI do for you?*
>>
>>
>> *Broadband Wireless - PtP/PtMP Solutions - WiMax - Mesh Wifi/Hotzones -
>> IP Security - Fiber - Tower - Infrastructure.*
>>
>> *CONFIDENTIALITY NOTICE: This e-mail is intended for the*
>> *addressee shown. It contains information that is*
>> *confidential and protected from disclosure. Any review,*
>> *dissemination or use of this transmission or its contents by*
>> *unauthorized organizations or individuals is strictly*
>> *prohibited.*
>>
>>
>>
>> *From:* members-boun...@wispa.org [mailto:members-boun...@wispa.org] *On
>> Behalf Of *Josh Luthman
>> *Sent:* Wednesday, January 20, 2016 1:11 PM
>> *To:* af@afmug.com
>> *Cc:* memb...@wispa.org
>> *Subject:* Re: [WISPA Members] [AFMUG] To Cambium With Love - Replace
>> the bad ePMP units.
>>
>>
>>
>> Why would making the memory faster degrade performance?
>>
>>
>>
>>
>> Josh Luthman
>> Office: 937-552-2340
>> Direct: 937-552-2343
>> 1100 Wayne St
>> Suite 1337
>> Troy, OH 45373
>>
>>
>>
>> On Wed, Jan 20, 2016 at 1:00 PM, Tyson Burris @ Internet Communications
>> Inc  wrote:
>>
>> Hello Cambium,
>>
>>
>>
>> At the MidWest-IX launch party last night, several of us Indiana WISPs
>> compared notes on the ‘cold weather’ problems we are seeing with ePMPs.  It
>> was very interesting to learn we are experience identical problems across
>> the spectrum.
>>
>> We all understand this is a DRAM issue with certain units you have
>> identified.  We also understand the firmware RC that has been made
>> available to fix this short term.
>>
>> The bottom line is we are very frustrated and grow tired of dealing with
>> it.
>>
>>
>>
>> Our concern is simple.  If your software fix ‘degrades’ the performance
>> of the product or triggers other issues, as it has been suggested, we would
>> prefer a full recall and replacement program immediately.
>>
>>
>>
>> If the suggestion that the fix will degrade the product performance is
>> inaccurate and not cause other issues, I would like for this to be made
>> public.
>>
>>
>>
>> Thank you,
>>
>>
>>
>> *Tyson Burris, President*
>> *Internet Communications Inc.*
>> *739 Commerce Dr.*
>> *Franklin, IN 46131*
>>
>> *317-738-0320 <317-738-0320> Daytime #*
>> *317-412-1540 <317-412-1540> Cell/Direct #*
>> *Online: **www.surfici.net* 
>>
>>
>>
>> [image: ICI]
>>
>> *What can ICI do for you?*
>>
>>
>> *Broadband Wireless - PtP/PtMP Solutions - WiMax - Mesh Wifi/Hotzones -
>> IP Security - Fiber - Tower - Infrastructure.*
>>
>> *CONFIDENTIALITY NOTICE: This e-mail is intended for the*
>> *addressee shown. It contains information that is*
>> *confidential and protected from disclosure. Any review,*
>> *dissemination or use of this transmission or its contents by*
>> *unauthorized organizations or individuals is strictly*
>> *prohibited.*
>>
>>
>>
>>
>>
>
>