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Okay I know there are manufacture parts numbers for these (Sandman...et cetera), however I am looking for the correct alpha/numeric designation for this TRW product:

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That looks like the 259A.

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No, the 259A is a single-outlet adapter with a 8P8C jack. This is a 153A1M adapter.


Ed Vaughn, MBSWWYPBX
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Ed, why are there 6 pairs of pins?


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Jeff: I'm not sure of that myself.

The wiring is first two pairs and last pair. We always just called them 153a's. And this particular model is the 153AM3.

This one goes to Ed.


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I believe that this model was field-adaptable, Jeff. The jack's leads were loose-ended and with the craft-friendly tool, TRW made it adaptable for any typical 1/2 line 1A2 environment to accept single-line devices. I do wonder about the fact that only certain pairs are available. Violet pairs were almost always available in adapters for obvious reasons.

I guess I should just concede and say that I have no clue as to their logic.


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Thanks Ed-


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White blue and white orange are available so the first line and A leads would be available for a SLT modified for A lead control on the Key system.

Yellow Slate is available for an external ringer to be easily connected.

The last 3 violet pairs are just there for ease of connectivity because they were spare in most (5 line) sets and so were available for.....whatever.

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Looks like the first 3 white pairs, red/blue, violet/brown, and violet/slate on that one above...interesting


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Jeff, keep in mind that pins 1/26 (white/blue) are on the right side of the male connector.


Ed Vaughn, MBSWWYPBX
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