[OZAPRS] VK3 IGate / Zone system.

[Richard Hoskin]

Dion,

This is a flexible system that uses the UI-Digi Pre-emptive digipeating. 

Don't think of it in the terms that are being discussed here with
SSn-n/Zonen-n as it uses a different concept based on cells with an
Internet
backbone. It is a holistic coverage approach that minimises traffic while
providing all station with a full view of the network on RF.

The system is transparent to the users, they only need to set a path of
RELAY,WIDE (or WIDE1-1,WIDE2-1) for mobiles and 'Their closest digi',WIDE
for home stations. We've tried to used the KISS principle but for those
that
need a little extra help with a local path they can visit
http://vk3.aprs.net.au/packet_path_guide.htm

Once setup there is no additional maintenance required and some redundancy
is built in.

Cheers
Richard
VK3JFK


> -----Original Message-----
> From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] On
> Behalf Of Dion Bramich
> Sent: Tuesday, 7 November 2006 5:22 PM
> To: VK / ZL APRS Users
> Subject: Re: [OZAPRS] VK3 IGate / Zone system.
> 
> How do you limit traffic to one zone?  How do you do interzone routing
> without involving other zones? How do you identify/define the zones
> easily?  How do you explain in simple terms to a newcomer how to
configure
> his path?  IMHO you have a unnecessarily high maintenance, hard to
> understand system.
> 
> Dion.
> 
> 
> On Tue, 07 Nov 2006 17:04:22 +1100, Richard Hoskin <vk3jfk at amsat.org>
> wrote:
> 
> >
> > This is a brief explanation of the way IGates are zoned in VK3, Mt
> > Gambier
> > (VK5) & southern NSW (VK2).
> >
> >
> >
> > Summary
> >
> >
> > To maintain high levels of efficiency and provide the widest possible
> > mobile
> > coverage on the APRS Network it is important to have a well-designed
> > network
> > based on a sound strategy. To this end the APRS network has been
divided
> > into Zones, which are linked together by the internet through IGates.
> The
> > concept is similar to the GSM mobile phone network.
> >
> >
> > Details
> >
> > An IGate Zone is an area that is covered by a single RX Only IGate.
The
> > Zone
> > extends a maximum of 2 hops (Wide Digipeaters) from the RX Only IGate.
> > The
> > RX Only IGate is located as close as possible to the centre of the
Zone.
> >
> >
> > The central TX IGate injects local internet APRS traffic into the RF
> > network
> > which propagates through the state's RF network. This reduces the
> > possible
> > complications of hidden transmitters and timing issues allowing for a
> > more
> > efficient RF system. It also means that data entering the system from
> any
> > one of the zones RX Only IGates is propagated through all other zones
> via
> > the central TX IGate. This again reduces network traffic while
providing
> > a
> > mechanism which allows the APRS users data to propagate through the RF
> > Network.
> >
> >
> > An IGate Zone is defined in detail in the document 'APRS Network
Design
> > for
> > VK3'. For an explanation on Wide Digipeaters read the document 'APRS
New
> > User Path Information Guide'
> >
> >
> > Traffic levels are the greatest limiting factor in the size of the
IGate
> > Zone.
> >
> >
> > To prevent packet duplication and network looping problems, (that very
> > quickly overload the local RF network) only one RX Only IGate per Zone
> is
> > used. It is also much more cost effective to have only one IGate in a
> > zone.
> >
> >
> > The RX Only IGates will also function as a local message gateway which
> RX
> > and TX local APRS messages for the area. The coverage area of the
Local
> > message zone is considered to be a maximum of two hops from the local
RX
> > Only IGate. The local RX Only IGate shall have a path of APRS via "the
> > Local
> > Wide Digi",WIDE.
> >
> >
> > APRS 'Wide Digipeaters' are currently programmed to digipeat the
alias's
> > RELAY, WIDE, TRACE, INETZ[x], WIDEn-N, Tracen-N.
> >
> >
> > Victorian Zones
> >
> >
> > Victoria has been divided into 6 IGate Zones; 5 Zones operate RX Only
> > IGates
> > and 1 Zone is the main State TX IGate as well as the local RX IGate
> >
> >
> > The IGate Zones are listed below.
> >
> >
> >
> > IGate Zone
> >
> > IGate Callsign
> >
> > Designation
> >
> > RX Coverage Area
> >
> > APRS Digipeaters Covering Area
> >
> >
> > 1
> >
> > VK3SB-1
> >
> > TX/RX
> >
> > Melbourne, Ballarat, Geelong
> >
> > VK3CV-1, VK3RMD-1, VK3RBU-1, VK3JFK-1 (VK3ROW-1)
> >
> >
> > 2
> >
> > VK3JTM-5
> >
> > RX Only
> >
> > Western Victoria, South Eastern South Australia,
> >
> > VK3RPG-2, VK3SSS-1, VK3RMK-1, VK5JFK-1, VK3KAY-1
> >
> >
> > 3
> >
> > VK3JFK
> >
> > RX Only
> >
> > (Backup TX)
> >
> > North Central Victoria, Southern NSW
> >
> > VK3RMG-1, VK3YWY-1, VK3RCV-1, VK3ECH-1
> >
> >
> > 4
> >
> > VK3VHF-1
> >
> > RX Only
> >
> > Gippsland
> >
> > VK3ZV-1, VK3RGI-1,VK3REB-1, VK3BLE-1, VK3VHF-1
> >
> >
> > 5
> >
> > VK3KAW
> >
> > RX Only
> >
> > North East Victoria, Southern NSW
> >
> > VK3RGR-1, VK3RAW-1, VK2RBY-1, VK3RLE-1, VK3HJQ-1
> >
> >
> > 6
> >
> > VK3WRM
> >
> > RX Only
> >
> > North West Victoria
> >
> > VK2RBX-1, VK3RON-1
> >
> >
> >
> > Cheers
> >
> > Richard
> >
> > VK3JFK
> >
> >
> > _______________________________________________
> > Ozaprs mailing list
> > Ozaprs at aprs.net.au
> > http://aprs.net.au/mailman/listinfo/ozaprs
> 
> 
> 
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