NEC ElectraElite 48, System Hardware Manual

Page: 219 / 435

Issue 6 Electra Elite
5 - 82 Installing Electronic Telephone Units
5.7 OPX(2)-U ( ) ETU
5.7.1 Description
The OPX(2)-U( ) ETU provides an interface for two
off-premise extensions. This ETU has a built-in ringing
generator (RSG). A maximum of 1600
:
of loop resistance
(including about 200
:
for 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.
The PBR circuit in the
MBD-U10 Unit
or the PBR( )-U
( )
ETU is required with Single Line Telephone Connection.
Figure 5-45 OPX(2)-U( )Unit