home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
HAM Radio 1
/
HamRadio.cdr
/
packet
/
pktinfo
/
packet10.loz
< prev
next >
Wrap
Text File
|
1990-11-03
|
5KB
|
92 lines
INTRODUCTION TO PACKET RADIO - PART 10 - By Larry Kenney, WB9LOZ
In this and the next part of the series we're going to take an in depth
look at the packet node network. In part 4 of this series we explained how
to use the network for connecting to another station. Now we'll look at
the other features a node offers.
A packet node, in most cases, is still set up for digipeater operation, so
you can still use it as a regular digipeater, but for most of your
connections you'll want to use the node features. When using a string of
digipeaters, your packets have to reach their destination parity correct,
and the receiving TNC has to return an acknowledgement (ack) to your TNC
for each packet cycle to be completed. As you add more digipeaters to the
string, the chances of this happening become less and less. Other stations
on the frequency and noise can be the cause of many retries. When using a
node, however, your packets no longer have to reach their destination
before acknowledgements are returned to your TNC. Each node acknowledges
your packet as its sent along the way toward its destination.
Using the packet node network can make your operating time on packet more
enjoyable and it can greatly expand the area that you can reach. The
network of NET/ROM, TheNet, G8BPQ and KAM nodes is expanding very quickly
and now covers most of the country. New nodes are showing up almost daily.
Thanks to all of these stations and the interconnecting links, you can now
connect to stations in many far distant places using a low powered 2 meter
rig. Some nodes are set up for cross-banding, and with the introduction of
nodes on 10 meter FM, there's the possibility of working a station just
about anywhere.
If you've been monitoring lately, you might have seen the nodes in action.
You might have wondered why they were sending all of those weird symbols
like @fx/<~|. What you're seeing is the nodes communicating with each
other and updating their node lists. You also might have noted callsigns
with high numbered SSIDs, such as WB9LOZ-14, WA6DDM-15, W6PW-12, etc. The
nodes change the SSID of all stations so that the packets sent via the
network are not the same as those sent directly. If you were to use a node
to connect to another station in the local area, there's the possibility of
your packets being received by this station both from you directly and from
the node. If the call through the node wasn't changed, the TNCs involved
would be totally confused as it would appear that two stations were
connecting using the same callsign. The node automatically changes the
SSID using the formula 15-N, where N is your usual SSID. A call with -0
becomes -15, a -1 becomes -14, -2 becomes -13, etc.
The node network is very simple to use. As explained in part 4, to use the
node network, you first connect to a local node. It should be one where
you can connect direct with good signal strength. Once you've connected,
you then have several options -- connect to another station within range of
the node, connect to another node, connect to an associated BBS, obtain a
list of the nodes that are available, or check route and user status. On
NET/ROM and TheNet nodes you can also answer or call CQ.
There are several commands available on your local node. All have CONNECT,
NODES, ROUTES and USERS, and depending on the type of node you're using,
you might also find the BBS, BYE, CQ, INFO, PARMS or PORTS commands
available.
THE PACKET NODE COMMANDS:
CONNECT: The CONNECT command (which can be abbreviated as C) is used just
like you use the CONNECT command with your TNC. To connect to another
local station using the node, simply enter C followed by the callsign. To
connect to another node you can use either the callsign or the alias. For
example, you can connect to W6AMT or you can connect to the alias SFO.
Either one will work.
There's a special consideration when making connections from a node using
the G8BPQ Packet Switch software. Since these nodes are capable of having
several different frequencies connected to the one node, you have to
indicate which frequency port you want to make your connection on. The
PORTS command, abbreviated P, will give you a list of the ports available,
such as this:
SF:WB9LOZ-2} Ports:
1 144.99 MHz
2 223.52 MHz
3 443.15 MHz
You then insert the port number between the C and the callsign, such as
C 1 W6RFN, to indicate which frequency you want to use, in this case the
port 1 frequency of 144.99 MHz.
NODES: The NODES command (which can be abbreviated as N) will give you a
listing of other nodes that can be worked from the node you're connected
to. It lists both the alias and the callsign of each node it knows about.
The list you'll find on each node will vary in length and will contain
different callsigns since all of the frequencies are not linked.
(We continue with more on the NODES command and other commands found on the
packet nodes in part 11)
- - - -