Re: [44net] hardware vs. software
"John D. Hays" <john@...>
I apologize if my reply wasn't what you expected. The team has many tasks to complete before release of the UDR56k-4. I answered with one, efficient, approach -- but it is not the only one.
"For example, assume I have four JNOS systems that are currently connected toeach other on a single subnet using a single 440 frequency. They talk to
each other using IP over AX.25. I would definitely like to increase the
speed. But it's not clear to me how I would deploy the UDR56K-4 to replace
the existing 440 radios/TNCs. What protocol would it run, at what speed?
What would the IP network diagram look like?"
You could continue to do that using the UDR56k-4. My supposition was that the equipment you currently use is not capable of the speeds available to the UDR56k-4. If you are going to be replacing the TNCs and 440 radios with a UDR56k-4, then its possible to consider moving the JNOS service right into the radio, saving power and space, which is what I was describing -- however, you don't have to use it in that manner. (See below)
On Sun, Jul 7, 2013 at 10:20 PM, Michael E. Fox - N6MEF <n6mef@...> wrote:
While it was not mentioned in your earlier question, if you wish to run in an bridge manner, you have two options (and possibly a third):
(in the future there may be a lower overhead protocol).
56kbps (and above) AX.25 can operate without FEC. It is a matter of path loss and modem BER. Our modems are designed to minimize BER and one may find that FEC is not required for a given network.
On the other hand, adding a protocol agnostic FEC in the modem is a possibility, exchanging raw bit rate for data correction. We are interested in this capability and will be looking at use cases for it.
At initial release, we will be delivering those capabilities listed on our information sheet at http://groups.yahoo.com/group/UniversalDigitalRadio/files/insert.pdf
Since this device is flexible by design, new capabilities can be added at any time, either by us or other developers. We believe this is a good investment value for our prospective customers.
We will be providing pre-provisioned applications for the UDR56k-4, some of those will be focused on EmComm data users, some on positional awareness users (e.g. APRS), and some on Digital Voice users. For those applications, its configure and run.
We will also be providing application notes, e.g. "solution 'oriented' documentation" as the product is released. This will include "bridging" solutions.
Unfortunately, we cannot engineer each user's unique application or solution. We will provide information that will help various teams and individuals to engineer their own solution.
The intent of this mailing list "UniversalDigitalRadio" is a place to exchange that type of information between users with input from our team.
Right now our team is most focused on delivering a quality product with multiple capabilities.