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FXO Cards for TA-850: 1175407L1 vs 1175407L2

I know the TA-850 is ancient at this point, but I was wondering if anyone knows the difference between the two model numbers for FXO cards: 1175407L1 and 1175407L2. I need to source a couple FXO cards for some TA-850s still in service, but I can't figure out if I should get the L1 or L2 model or if it even matters.


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