Verizon has shifted to installing ONTs inside whenever possible. The old Tellabs 611 which was replaced last year when I upgraded my Internet service from 75/75 to 400/400 served us for almost 13 years. From what I've read, the long life was because the Verizon contractor installed it in the basement as opposed to outside the house. Externally mounted ONTs tend to have shorter lifespans.
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