NEC ELECTRA ELITE IPK II - Opx(2)-U( ) Etu; Description

Electra Elite IPK II Document Revision 3
System Hardware Manual 6 - 77
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6.6 OPX(2)-U( ) ETU
6.6.1 Description
The OPX(2)-U( ) ETU is the interface for two off-premise extensions.
This ETU has a built-in ringing signal generator (RSG). A maximum
of 1600 Ω of loop resistance (including the Single Line Telephone) is
acceptable between the OPX(2)-U( ) 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 dial pulse detection.
Figure 6-41 OPX(2)-U( ) ETU