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#558088 09/17/13 09:02 AM
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Jeff Moss

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It looks remarkably similar to the factory-wired blocks that would have been located within a Comkey 718, 1434 or 2152 KSU.


Ed Vaughn, MBSWWYPBX
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That'd be my guess too.


Retired phone dude
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As the bottom of the block suggests. It is a diode matrix block for split ringing for 1A2.


TG
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https://sundance-communications.com/forum/ubbthreads.php/topics/7868/1a2_diode_matrix

Scroll down to read Ed's very thorough explanation of diode matrix ringing.


Arthur P. Bloom
"30 years of faithful service...15 years on hold"

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Thanks guys!


Jeff Moss

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Never seen one of those, very interesting.


Will G.
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I've seen blocks similar to that used in nurse call systems


Merritt

Business Telephones & Equipment + Commercial Audio/Video Products
Commercial Communications . . . Turner, Maine
If it was built after 1980 don't expect it to work right.
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Ed's probably right but I seem to remember seeing something like this on a small motel switch to block LD and prefix's
to only local calls.(been a long time)

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They were also used with older Executone systems. Most of the ones I've seen were installed in Social Security offices, so it may have been something the contract holder liked to use.


Sometimes the thoughts in my head get so bored, they go for a stroll through my mouth. This is rarely a good thing.
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