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Information about the cable pinouts of specific Sangoma boards may be found at Cable Pin Numbering and Pinouts
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RJ-45
The RJ-45 (Registered Jack 45) is one of the common physical connectors in the communications industry today eventhough it is not an official standard. An RJ-45 connector is used to refer to a 8 pin - 8 connector (8P-8C) modular connector. The name is also "RJ-45" is incorrectly used to describe a common ethernet cable (TIA/EIA-568-B).
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