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[aprssig] Delayed packets

Tim Cunningham tim_cunningham at mindspring.com
Tue Jun 6 16:22:09 UTC 2006


If the delay is in a digipeater, somebody could have DWAIT programmed to 
something other than 0. In this scenario, if a digipeater delayed and waited 
for a clear channel because DWAIT was greater than zero, the packet could be 
delayed in a busy network. The delay could depend on how much activity is on 
the network. This would be a real good argument for DWAIT=0 on a digi or 
SlotTime=1 and PPersitance=255 on a UIDIGI. The other possible parameter 
would be an extreme setting for TXdelay in the case of a digipeater. If the 
issue is not related to a digipeater, then these settings would not be 
applicable. I have seen cases in the past where a digipeater would fire off 
a load of packets waiting in the queue because of these parameter settings. 
However, eight minutes is a rather lengthy period of time.



Tim - N8DEU



----- Original Message ----- 
From: "Bruce W. Martin, KQ4TV" <aprs at almostanywhere.com>
To: "TAPR APRS Mailing List" <aprssig at lists.tapr.org>
Sent: Tuesday, June 06, 2006 10:37 AM
Subject: Re: [aprssig] Delayed packets


>I recently had a discussion with some others about this very subject.  He 
>was in Huntsville, Alabama and his packet was immediately I-Gated  by the 
>local Huntsville I-Gate and 8 minutes later, after 4 or 5  update packets, 
>his position was I-Gated by my javaprssrvr running on  a Gateway 2000 P200 
>with a built in serial port. I know the packet  went through 2 digis to get 
>to me about 100 miles north in Tennessee.  The delay seemed to be in the 
>digipeaters.
>
> Bruce, KQ4TV
>
>
> On Jun 6, 2006, at 8:38 AM, Wes johnston wrote:
>
>> WRT uiview, we had two stations near here doing it and in each case  they 
>> were UIview, which lead me to my previous conclusion.  Your  report that 
>> a copy of xastir did it is the first I've heard of the  problem outside 
>> uiview. This begs the question: what do these  delayed packet igates have 
>> in common? this could lead us to  pointing fingers at a particular brand 
>> of USB serial adapter.  I  have one that is based on the prolific chipset 
>> that won't program  my TT3 b/c the last packet never gets sent until 
>> another one comes  along to "push" it out.  Many laptops and some 
>> desktops are now  coming with USB on the motherboard for serial ports, 
>> could that be  the problem?
>>
>> Wes
>>
>> ----- Original Message ----- From: "Curt, WE7U" <archer at eskimo.com>
>> To: "TAPR APRS Mailing List" <aprssig at lists.tapr.org>
>> Sent: Tuesday, June 06, 2006 9:16 AM
>> Subject: Re: [aprssig] Delayed packets
>>
>>
>>> On Tue, 6 Jun 2006, Wes johnston wrote:
>>>
>>>> Although it is difficult to prove, this delayed delivery of a  packet 
>>>> seems
>>>> to always revolve around the UI-View client.
>>>
>>> Very difficult to prove, considering it isn't true!  ;-)
>>>
>>> I know of at least one Xastir client that has had the same sorts of
>>> difficulty, gating things in either direction late.  It appears to
>>> be a function of that particular machine 'cuz I don't recall hearing
>>> of others that do it.  Never figured out why it does it on that one,
>>> which is owned by a nearby friend of mine.
>>>
>>>
>>>> running uiview in our area to stop igating and the problem went  away 
>>>> for us.
>>>> Please let us know what you find.  Unfortunately, we all know the 
>>>> chances of
>>>> fixing this....
>>>
>>> Because the author is SK?  Yea, but I thought all of UI-View's ills
>>> could be fixed with a plug-in...  More than likely somebody will
>>> write a plug-in to replace the igate functionality if it's possible
>>> to do that particular piece with the plug-in API.  I've come to the
>>> conclusion that people won't ever let UI-View die a natural death.
>>> More than likely people will keep older Windows versions around
>>> after newer Windows releases make it obsolete, just to run UI-View.
>>>
>>> --
>>> Curt, WE7U.   APRS Client Comparisons: http://www.eskimo.com/~archer
>>> "Lotto:    A tax on people who are bad at math." -- unknown
>>> "Windows:  Microsoft's tax on computer illiterates." -- WE7U
>>> "The world DOES revolve around me:  I picked the coordinate system!"
>>>
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>>
>>
>>
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