Black Box TE160A-R2, Руководство пользователя

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Chapter 2: Overview
2.4.2 Automatic Ring-Down Configuration
Two Unit B devices are required for the ARD (automatic ring-down) configuration.
ARD is a dedicated, point-to-point voice system. When one telephone is taken off-
hook, the other telephone rings without dialing. Two Unit B devices, connected
via the fiber ports, are required for this mode of operation, with a telephone
device at each end.
Unit B (TE161A-R2)
Emulates the Central
Office (CO)
Unit B (TE161A-R2)
Emulates the Central
Office (CO)
Figure 2-8. Automatic ring-down configuration.