[Dxspider-support] Curiosities about network topology

[Kin]

I have already requested two partners for an 8 hops route (theoretically),
all DXSpider nodes with PC9x ON.
Once I have them, I'll start measuring ;-)
 
Kin
 
 
EA3CV-2 dxcluster.cronux.net 7300
http://clustermap.cronux.net/map.html
http://clustermap.cronux.net/route_finder.html
 
De: Dxspider-support <dxspider-support-bounces at tobit.co.uk> En nombre de
Dirk Koopman via Dxspider-support
Enviado el: martes, 3 de diciembre de 2024 19:19
Para: dxspider-support at tobit.co.uk
CC: Dirk Koopman <djk at tobit.co.uk>
Asunto: Re: [Dxspider-support] Curiosities about network topology
 
What I would be interested in is the maximum and average time a PC92 type
message traverses the network. One is never going to get a granularity of
less than one second, 'cos the time (as in PC92^RW3XA-8^135^...) is in
seconds. And there are some issues with people not syncing their time, not
to mention to remember that the time rolls over back to 0 at midnight UTC.
Oh and, sometimes, the time value could be 135.1 or 135.7 etc which only
indicates that more than one message was originated in that second from that
node. 

An extra little project for you :-) Although, arguably it could be something
that is maintained by each node and can be inspected (by the sysop?) to
(maybe) quash this annoying habit (to me at least) of users connecting to as
many nodes as possible simply to "get an edge".

73 Dirk G1TLH


On 02/12/2024 17:59, Kin via Dxspider-support wrote:
Hi,
 
I was curious to know what would be the largest distance (hops) that could
occur in our network with the current topology.
I started with a graph that you can see here:
http://clustermap.cronux.net/route_finder.html , and I ended up with a few
lines of code :(
 
>From the data obtained from the PC92C sentences, the following data can be
inferred:
 
Hops   Quantity    Nodes
----     --------        -----
   1     1782      563
   2     20003     561
   3     57289     561
   4     54012     561
   5     19279     561
   6     4001      539
   7     639       256
   8     67          49
   9     9             7
 
The 'Quantity' column counts pairs of nodes that have a route with N hops.
The 'Nodes' column counts unique nodes involved in any path with N hops.
 
It represents the minimum hops between nodes (all to all).
It is based on a study of 563 nodes.
For each node, the distance to all other nodes has been calculated using BFS
(Breadth First Search).
 
It has to be said, that it is possible (for sure) that there are other
routes and nodes that could not be used in this study. The reason for this
is the lack of information (existence) about them or their neighbouring
nodes. Among them are ARCluster, DXNet, CLX, CCCluster, especially those
nodes that are not directly linked to nodes using PC9x.
 
Not even 10 hops are necessary to reach a node.
We could infer that with 4 links on average, the 563 nodes would be at a
maximum distance of 5 hops. [SUM(i=1 to 5) f(i)]
Makes you think, doesn't it?
 
 
73 de Kin EA3CV
 
 
EA3CV-2 dxcluster.cronux.net 7300
http://clustermap.cronux.net/map.html
 
 
 
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