Etross ET-8848, Руководство пользователя

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The Sketch for connecting ordinary Telephone
Draw your attention: Because there are many types of ordinary telephone and their electric
parameters are different. In order to avoid mutual disturbance between telephone and terminal
and affect voice quality. The distance between telephone and terminal is 1.5m at least.
2) The installation for connecting to billing device for metering
If the users demand to register cost during calls, billing device can be connected between
terminal and ordinary telephone. Billing device register cost according to the anti-polarity signal
that is provided by terminal.
The sketch for connecting to Billing device or Computer charging system
3) The installation for connecting to PBX for call extension
If users want to connect small PBX to this terminal, connect terminal’s “Phone port” to the PBX.
The sketch for connecting to PBX device.