NEC Australia Pty Ltd Xen Master & Xen Axis
5 - 144 Installing Electronic Telephone Units
A6-324000-642-01 – Release 4.0
May 2001
4.12 OPX(2)-U13 ETU
4.12.1 Description
The OPX(2)-U13 ETU is the interface for two off-premise
extensions. This ETU has a built-in ringing generator
(RSG). A maximum of 1800
Ω
of loop resistance (including
about 200
Ω
for the Single Line Telephone) is acceptable
between the OPX(2)-U13 ETU and a Single Line
Telephone.
This ETU also provides circuitry for loop status detection,
talk battery, sending ringing signals from the RSG unit to
the Single Line Telephones, and a dial pulse detection.
Note: The PBR circuit in the CPUB( )-U13 ETU or the PBR (0)-
U13 ETU is required with Single Line Telephone
Connection.
Figure 5-26 OPX(2)-U13 ETU
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