SELV (Safety Extra Low Voltage) compliance (P710)
Safety status of input/output connections comply with SELV requirements.
Warning: To avoid electric shock, do not connect safety extra-low voltage (SELV) circuits to telephone-network voltage
(TNV) circuits. LAN ports contain SELV circuits, and PSTN ports contain TNV circuits. Some LAN and PSTN ports both
use RJ-45 (8P8C) connectors. Use caution when connecting cables.