>>I set up an X.25 link on serial port A of a SS20. Everything is OK.
>>Once I switch the connection to serial port B. The LAPB layer didn't
>>get up at all. I confirmed that the two ports have identical setting.
>>I use a splitter on the SS20 and the Sunlink X.25 version is 8.0.2.
>>A distributor in Hong Kong mentioned that serial port A of SS20 can be
>>used as either async. or sync, but the serial port B is async. only.
>>That is the reason why port B didn't work. Is it true?
>We have a Sparc Scorpion box and that's how we use it. Serial A works
>fine with Sunlink X.25 8.0.2. in our case.
>>He also said that the SPC board doesn't support X.25. The only
>>solution to have more that one physical link from a SS20 is to get a
>>HSI board. Do you have any better suggestion?
>I would verify this before rushing out to buy a HSI board!!
We did use two HSI boards on another project for high speed
communication before. There are a few reasons that we are redundant to
use it in the current project. Firstly, it is expensive. Secondly, we
only require 19.2 kbps. Thirdly, the physical interface on the other
end is RS232 and the HSI has the RS449. We need a converter or a
special cable to do the convertion.
Last time, we need a back-to-back connection from the SS20 to a Nokia
switch machine which has a V.35 interface. It took our hardware staff
more than a month to tailor make a special cable.