Enabling/Disabling Squelch Mode; Adjusting The Squelch Mode Threshold; Adjusting The Rf Gain - evertz MultiFrame 7700 Manual

6.1.3. Enabling/Disabling Squelch Mode

Squelch mode will turn off the laser output if the RF input drops below the squelch threshold setting (see
section 6.1.4). This feature is useful for triggering downstream automatic main/standby protection
switches, and for other such applications. To enable or disable squelch mode, select the CTRL menu item
in the first menu level, then use the toggle switch to display the SQL option and press the pushbutton to
select it.
CTRL
SQL
CH1/CH2
ON
OFF

6.1.4. Adjusting the Squelch Mode Threshold

The RF Squelch threshold may be set from this menu via the SQTH selection. The squelch level is based
on the RF input power to the transmitter.
To select the RF Squelch threshold, select the CTRL menu item in the first menu level, then use the toggle
switch to display SQTH option and press the pushbutton to select it.
CTRL
SQTH
CH1/CH2
0 to -60 dBm

6.1.5. Adjusting the RF Gain

The 7807LT-2 can apply gain to adjust the level of the input signals in 0.5 dB increments. This allows
weaker signals to be gained up for optimal laser depth of modulation and CNR performance. For optimal
performance tuning, it is recommended that a spectrum analyzer be connected at the receive side of the
link while the gain value is adjusted to provide the best CNR performance while not introducing distortion
products which may appear as an increase in the noise floor while increasing gain level, or as "spectrum
skirts". To set the gain, select the CTRL menu item in the first menu level, then use the toggle switch to
display the GAIN option and press the pushbutton to select it.
CTRL
GAIN
CH1/CH2
0 to +31.5 dBm

Note that this menu item is not applicable and therefore not visible when in AGC mode.
7807LT-2 Dual Wideband RF Fiber Transmitter
Enable squelch mode.
ON
Disable squelch mode (default).
OFF
RF Squelch threshold range (default -60 dBm).
0 to –60 dBm
0 to +31.5 dBm Output signal gain level (default 0 dBm).
Revision 1.2
7700/7800 MultiFrame Manual
Page - 19