[OZAPRS] VK3 IGate / Zone system.

[Dion Bramich]

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
>
>
> _______________________________________________
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> Ozaprs at aprs.net.au
> http://aprs.net.au/mailman/listinfo/ozaprs



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