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- PACKET INFORMATION BULLETIN - #1
- DETERMINING NODE ROUTE QUALITY
-
- As I monitor the activity on the local packet frequencies, I see users
- attempting to connect to nodes that aren't accessible, or to distant
- nodes via a poor path when a good path is available. This wastes the
- user's time and adds unnecessary congestion to the network.
-
- In this first bulletin of my new "Packet Information" series let's look
- at a feature offered by the nodes and packet switches that gives you a
- simple way to find out if a node is accessible and, if it is, the best
- route to use to reach it.
-
- After you connect to your local NET/ROM node, TheNet node or G8BPQ packet
- switch, it's easy to make a quick check of the route quality to any other
- node or switch. All you need to do is enter N followed by either the
- alias or callsign of the node or switch that you want to reach, such as:
- N FRESNO or N W6ZFN-2
- You'll receive a report showing up to three routes to the node you asked
- about, how good these routes are and how up to date the information is.
- If there is no information available, you will receive either "Not found"
- or the complete node list, depending on the type of node or switch you're
- using.
-
- Let's take a look at a typical report you would receive after entering
- N FRESNO. If you were connected to a NET/ROM or TheNet node the report
- would look like this:
- SFW:W6PW-1} Routes to: FRESNO:W6ZFN-2
- 105 6 0 WB9LOZ-2
- 78 6 0 WW6L-1
- 61 5 0 WA8DRZ-7
- If you were connected to a G8BPQ packet switch you would see one less
- column in the report and it would look like this:
- SF:WB9LOZ-2} Routes to: FRESNO:W6ZFN-2
- > 126 6 W6PW-10
- 61 3 WW6L-1
- 60 4 W6PW-1
- Each line shown is a route to the node or switch you asked about.
- The symbol > indicates a route that's in use.
- The first number is the QUALITY of the route. 255 is the best possible
- quality and means a direct connect via hard wire to a coexisting node
- at the same site; zero is the worst, and means that the route is locked
- out. 192 is about the best over the air quality you'll find, and it
- usually means that the node is only one hop away. If you see a quality
- of less than 80, you'll probably have a difficult time getting any
- information through via that route.
- The second number is the obsolescence count. This number is a 6 when
- the information for this route is less than an hour old. For each
- hour that an update on the route is not received, this number is
- decreased by one. A 5 means the information is an hour old, a 4 means
- that it's two hours old, and so on.
- The next number, shown only on NET/ROM and TheNet nodes, indicates the
- type of port. A 0 is an HDLC port; a 1 is an RS-232 port. You don't
- need to pay any attention to this figure.
- The callsign is that of the neighboring node or packet switch that's
- next in line on the route. Digipeaters are shown if any are used to
- reach this neighboring node.
-
- This quick check on a node or switch that you want to reach can save
- you a lot of time. You'll know immediately whether or not the node is
- available, and if it is, how good the available routes are to it. You
- then won't have to spend time trying to connect to a node that isn't
- available or is of poor quality.
-
- If you find that there's a decent route to the node or switch you want
- to reach, it's normally best to let the network make the connection
- for you. Simply enter a connect to the alias or callsign you want
- rather than connecting to each individual node along the route yourself.
-
- If a route exists but the quality is not very good, you might want to
- connect to the neighboring node shown for the best route, then do
- another quality check, repeating this procedure until you find a route
- with decent quality. You can actually get through to some distant
- nodes using this method if you have the time and patience to work on it.
-
- de Larry Kenney, WB9LOZ @ W6PW.#NOCAL.CA.USA.NA
- NCPA Education Coordinator
-
-