John:
Yes, the K403A was PART of providing MOH on a 1A2 systems. This card was just a bank of 1:1 transformers, etc. with diodes and capacitors to provide separate isolated MOH sources for each K400E line card. The actual MOH source was hard-wired wired to this card and then it was fed out on individual pairs to each of the seven line cards it supported, and they needed to be K400E.
BUT the K403A required an unwired card slot that had each output pair wire wrapped to pins 3 and 18 or each line card slot. This IS NOT a plug-in solution! Plugging this card into a standard slot in a KSU will certainly burn up many of these transformers.
The original poster is using San/Bar 4200-200 cards, indicating that parallel-connected MOH input is acceptable. They don't have the same kind of setup at all with regard to the use of a K403A.
