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342-86400-445PS
Issue
4.0
October
2006
Page
67
Copyright
GE Multilin Inc. 2002
VF Setup
Line
Impedance
May be set to either 600
Ω
or 900
Ω
in series with or without
2.16 µF of line capacitance.
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. Impedance
mismatches create side tones which in the worst case are
perceived as echoes. The addition of 2.16 µF adds capacitive
reactance to the line that may reduce noise and distortion.
NBOC
May be set to 0 nF, 4.7 nF or 10 nF. This may be used for
additional line capacitance compensation.
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 -9.5 to +5.0 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.
Test Setup
Bantam
Jack
May be set for
Bridging
or
Splitting
(default).
Bridging mode
allows for monitoring of the circuit via bantam jacks
on the unit face plate.