Clear-Com EF-701M - Manual (Page 19)

E F - 7 0 1 M I N T E R F A C E 1 - 9
Sidetone Null Adjustment This set of three trimpots includes R=Resistance,
L=Inductance, and C=Capacitance. These compensate for each component of the line
impedance, providing the best null possible. To prevent damage to the level control and
nulling trimpots, do not force them past their stop points.
Power LED This green LED will illuminate when the EF-701M is receiving power from
pin 2 of the party-line XLR connection.
Data LED This amber LED has four modes. The first three relate to call signal data.
1. ON- Either a successful data link has been established with a remote EF-701M unit, or
the Matrix Direct mode has been selected at the local EF-701M unit.
2. OFF- There is no data connection at the local EF-701M unit.
3. RAPID BLINK- There is data connection at the local EF-701M unit, but a “break”
condition is present. Depending on the modems used, this can indicate a problem at
the remote end.
4. SLOW BLINK- A test earbud or headphone has been plugged into the test tone jack at
the local EF-701M and the nulling test tone is on.
Call signals will not transmit unless the LED is steadily illuminated. Audio is still
transceived by a connected unit.