Vf Setup - GE JungleMUX 86445-31 Technical Practice And Installation Manual

VF Setup

LINE IMPEDANCE
May be set to either 600 Ω or 900 Ω in series with or without
2.15 µF of line capacitance.
hardware strapped on the main assembly board.
Note: The selection made in this field must match the respective
strapping selection made on the unit's main assembly board.
Note: It is important to match the actual line impedance with the
2W FXS unit's input impedance to maximize the amount of power to
be transferred from the telephone to the line.
mismatches create side tones which in the worst case are
perceived as echoes.
reactance to the line that may reduce noise and distortion.
NBOC
Selectable to 0, 22, 47 or 69 nF. This may be used for additional
line capacitance compensation.
strapped on the main assembly board.
Note: The selection made in this field must match the respective
strapping selection made on the unit's main assembly board.
Note: Network build-out capacitance is added to provide additional
line balancing. Generally, no additional NBOC is required for lines
shorter than 2000 ft (600 m).
TRANSMIT LEVEL [dBm]
Software selectable from -14.0 to +6.0 dBm in 0.1 dB increments.
Default is 0 dBm.
Note: The Line Impedance parameter shall be set before Transmit
Level because any subsequent changes to the Line Impedance
setting may also alter the Transmit Level setting.
RECEIVE LEVEL [dBm]
Software selectable from -15.0 to +5.0 dBm in 0.1 dB increments.
Default is -2 dBm.
Note: The Line Impedance parameter shall be set before Receive
Level because any subsequent changes to the Line Impedance
setting may also alter the Receive Level setting.
Copyright  GE Multilin Inc. 2002
This impedance must also be
The addition of 2.15µF adds capacitive
NBOC must also be hardware
342-86400-445PS
Issue 4.0
October 2006
Page 86
Impedance