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This group is for questions/answers, development notices, techniques for using the Seriss 1A2 key system "single card" KSU for old multiline business phones, as first demonstrated in this video with 4 phones and two lines, and more recent video that demonstrates linking two boards to manage 4 lines/8 phones.

At times when customers reply with problems through email and I help them solve them, I reduce the problem/solutions here so others can benefit from the troubleshooting process and solutions. I expect for a while this will be more like a wiki; a collection of technical info presented as a newsgroup; each subject organized as a separate thread, with updates posted as needed.