There are two flavors of 816 and they used different books.

The OLD 816 had a black cabinet and the manual had instructions for one doorphone.

The newer but discontinued for over five years 816 PLUS had a different manual and the ksu was beige. The manual for that one, the PLUS, showed two doorboxes.

To further complicate, there were 816 ksus that did not say PLUS on them and were beige.

The PAGING connections were different on the 816 and 816 PLUS, so if you could not do external paging, you probably have the wrong manual.

Which ksu do you have, an old black 816, a beige 816 WITHOUT the PLUS on the cover or an 816 PLUS?


THE Bracha, old blond specialist in Rube Goldberg solutions.