Instruction manual

Out-of-Building Stations
Out-of-Building Stations
Description
Single-line voice terminals and multiline 7300H series terminals may be directly connected to the
system even though they are not located in the same building. For 7300H series terminals, special
In-Range Out-of-Building (IROB) units are used to protect the switch and its users from lightning,
power crosses, etc. Out-of-Building Stations can access all system features.
Considerations
Single-line voice terminals may be located at distances up to 24000 feet from the system cabinets.
Carbon protection devices are required for lightning and power cross protection.
Multiline voice terminals must be located within 2000 feet of the system cabinets (local power is
always required) and must have IROB protection devices. MET sets may not be used for Out-of-
Building service.
Hardware Requirements
Out-of-Building multiline voice terminals require IROB units. Single-line voice terminals require
carbon protection devices and must be connected to ports on the TN742 or TN746 Analog Line CP.
Connectivity information is provided in Section 4, “Hardware Description.”
November 1995
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