K-Tech ET401A, Инструкция

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Wiring
We strongly recommend that the wires used to supply the telephone
line to K-Tech emergency speakerphones be 20 AWG shielded,
twisted pair.
The shield must be continuous from the speakerphone through the
traveling cable to the incoming telephone line termination. Make
sure the shield is connected to a
true earth ground at one end
only! This will minimize the interference from AC inductance and RF
(radio frequency).
Telephone Lines
For best operation, each K-Tech K-Phone ET401 Emergency
Speakerphone must be installed on an analog touch-tone telephone
line. Compatible line types are standard analog two-wire central
office lines (POTS) from the local telephone company or most
internal PBX systems.
The K-Phone ET401 Emergency Speakerphone should be
installed on a dedicated telephone line. Sharing a telephone line
with other devices (e.g. fax machine, alarm system, another
telephone, etc.) could affect code compliance and/or cause the
K-Phone ET401 Emergency Speakerphone to malfunction.
The telephone line will be assigned a telephone number which
allows the called party to call back to the location of the emergency.
Take care to note this number and supply it to the called party.
Telephone Line Specifications
Line Type Standard two-wire voice analog
Line Voltage 24 VDC minimum on-hook
Loop Current 30 mA minimum