Esse-ti 4G.next Voice, Руководство пользователя

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Page 11
Connection to the power supply
Power supply via 230 Vac external adapter

Connect the external adapter to the specific input (H in the picture
at page 8).

Connect the backup batteries to the dedicated input (N in the
picture at page 8).

Close the gateway cover.
or
12 Vdc power supply

Connect the power supply cable to the specific terminal (L in the
picture at page 8) taking care to respect the polarity.

Connect the backup batteries to the dedicated input (N in the
picture at page 8).

Close the gateway cover, paying attention to the power supply
cable.
WARNING
Backup batteries may be connected only after gateway
has been supplied
Note: the max voltage to be supplied to the 12 Vdc terminal
is 17 Vdc.
Note: the min voltage required to supply the gateway by the
12 Vdc terminal is 10 Vdc.
Note: a protection cut-out switch must be installed upstream
to interrupt power supply in case of fault.