12.1 Option Board Basic Setup
The COR/Hookswitch Option Board must be installed at the factory. In addition to the COR &
Hookswitch Options, the board provides extension pins for the MIC Z, Electret Voltage and Front
Panel Mic Connector pins from the main C250C board. See the diagram below:
Refer to Section 7 of this Manual for instructions on setting these jumpers. Note that the 200
Ohm jumper position is incorrectly marked on this board. The correct position for 200 Ohms is
the two pins next to the label “J10”.
Option Board
NCS-C250C Instruction Manual Rev J
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Mic Impedance
Jumper Block
Electret Voltage
Jumper
Front Panel Mic
Connector Pins