ST 500 "Piranha" Operation Manual: Supplement #2 - Typical Electronic Switch Settings
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11. SUPPLEMENT #2. TYPICAL SETTINGS OF THE ELECTRONIC SWITCH.
8C8P connecting ("F1")
Computer 8-wire line equipped RJ45 connector
6P6C connecting ("F2")
6-wire telephone line, equipped with connector RJ25 or RJ12
6P4C connecting ("F3")
4-wire telephone line (equipped with connectors RJ11)