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IZ0JRJ > TUTTI 30.01.08 20:31l 108 Lines 4575 Bytes #999 (0) @ ITA
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Sent: 080130/1019Z 4678@IR0UCI.ILAZ.ITA.EU [Roma, JN61HS] FBB7.00g $:14117-IZ0J
From: IZ0JRJ@IR0UCI.ILAZ.ITA.EU
To : TUTTI@ITA
[――― TST HOST 1.43c, UTC diff:5, Ora Locale: Mer Gen 30 11:58:39 2008 ®®®]
VISTO LA MIA IGNORANZA CON LA LINGUA TECNICO INGLESE (E NON SOLO) ......
CHI PUO AIUTARMI A TRADURRE CODESTE INFO.
LUI E UN PROGRAMMA DIGIPEATER PER TRAFFICO A.P.R.S. DI GEORGE ROSSOPOULOS SV2AGW.
RINGRAZIO ANTICIPATAMENTE PER L'AIUTO.
SALUTI
DANILO
----------------------------------------------------------------------------------
This is the digi setup dialog.
Lets see how each item affects the digi operation.
Enable RELAY.
If this is checked then the Digi will digipeat packets that their via
path (digi list) contains the Call RELAY.
All digis must digipeat these frames.
RELAY Call Substitution.
If this is checked then the digi will replace the RELAY path call with
its call. for instance the frame
1:Fm SV2BBO to APAGW via RELAY will become
1:Fm SV2BBO to APAGW via SV2AGW-12* The RELAY call has been replaced
by Digi Call (SV2AGW-12).
Enable WIDE and WIDE Call Substitution
This controls if your digi will digipeat frames that contain in the
Via Path calls the call WIDE.
In most cases WIDE is enabled if your digi covers a large Area and can
be used to link different Packet Areas.
If your digi location is inside a city don't enable it unless you are
in a privilege position.
Call Substitution will replace the WIDE call with your digi call and
that way the Packet will not propagate further.
Enable TRACE and Trace Call Substitution.
This controls if your digi will digipeat frames that contain in the
Via Path calls the Call TRACE.
By default the Call Substitution is enabled.
Your digi must digipeat these packets.
TRACEN-N and WIDEN-N
AX25 specifications allow just 8 digipeaters in the Via Path calls.
This means that a Packet can do just 8 hops from digi to digi.
Although this seems enough there are cases where you need your packet
to propagate further.
WIDEN and TRACEN help to achieve it.
Lets see how it works. A packet with via path set to WIDE5-5 is heard
then the digi digipeats the packet at replace the WIDE5-5 with WIDE5-4,
other digis that hear the WIDE5-4 decrease the SSID as they digi it.
When the SSID reaches zero then they decrease the WIDE5 to WIDE4 and
so on.
That way this packet can do 10 hops.
YUou may specify a via path like WIDE7-7,WIDE7-7 and so on.
The TRACEN-N works the same way but each time a digi digipeats a frame
inserts also its call.
It mainly used to see how a packet travels from digi to digi.
Dupe Check
Since the via Path of an APRS Packet contains generic digipeater calls
like WIDE,TRACE, RELAY etc and to prevent retransmition of the same
packet from the same digipeater, we must have a mechanism to prevent
duplicate packet digipeating.
AGWUIDigi has a unique algorithm to check if a frame has been digipea-
ted.
The list of digepated frames is kept in memory for a time specified by
the DupeCheck field value.
The algorithm works as follow.
When a packet received and digipeated the program calculates a CRC32
value counting the bytes the information field contains.
That way frames with the same CRC32 are ignored.
A CRC32 value is removed from the list after the specified time.
This field contains the time a CRC32 will be kept.
It is in Seconds.
A value of 20 secs is enough.
NEW Widen-N
Pressing it setup digi on this radioport to behave according to new
Widen-N specifications for USA.
It actually stops any packet with a WIDEn-N greater than 2.
If a packet is received with say Wide3-3 will be stoped.
You can change this limit from WIden-n Limit.
HOPS
You can set the MAX hops allowed.
If a packet is received with more than this limit Hops then it stopped.
For USA you must set it to 3.
For other countries set it to 14.
If you set it to 14 then a packet with a path of WIDE7-7,WIDE7-7 will
be digipeated.
Stopped Packets
A stopped packet is indicated with a path of QRT*.
That way the user may be notified that he uses a very huge path and
must lower it.
It is more politely than to ignore it.
Copyright 2004(SV2AGW) George Rossopoulos. All rights reserved.
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