TEL-14 TWO-CHANNEL TELEPHONE INTERFACE
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"Ring/Off-Hook" LED
The "ring/off-hook" LED flashes red when the telephone line
receives a ring signal. The LED is green while the line is answered
and in use. The LED flickers yellow during the automatic hybrid
nulling process. The LED is off when the line is on-hook and not
ringing.
"Hook" Button
The "hook" button allows a local operator to manually toggle the
TEL-14 line between "on-hook" (telephone line not in use) and "off-
hook" (line "seized" -- that is, in use) status. If a line is seized at the
interface by the "hook" button, that line cannot be released from an
intercom station, even if the
“matrix control” option switch is set. The
line can be released only by either pushing the button again, or by
auto-disconnect (if the auto-disconnect option switches are set).
"Send Level" LED
The bi-color "send level" LED lights green when the audio signal
being sent to the telephone line is at a typical acceptable level. The
LED lights red when the audio output signal level is too high. In
normal operation, the LED should light green during speech and
only flicker red intermittently. The
“send volume” control adjusts the
level indicated by this LED.
"Send Volume" Control
The "send volume" control sets the level of the signal that the TEL-14
sends to the telephone line by changing the AGC limiting level. It is
only active when the "auto gain" button is set to
“adjustable.” The "send
volume" control has a range of 12 dB. Adjust the "send" control so that
the "send level" LED always lights green with no more than occasional
red flashes.
"Receive Volume" Control
The "receive volume" control sets the level of the signal that the TEL-
14 receives from the telephone line by changing the AGC limiting
level. It is only active when the "auto gain" button is set to
“adjustable.”
The "receive volume" control has a range of 12 dB. While setting the
receive volume, listen to the output from the telephone line in normal
use. Adjust the
“receive” control until the telephone receive level is
comparable to the volume level of other intercom listen paths.
"Auto Gain" Button
With the "auto gain" button set to fixed, the TEL-14 adjusts the audio
gain to limit the send and receive telephone line signals to normal
levels. In the fixed mode, the "send volume" and "receive volume"
controls are disabled, but are in effect set to their center positions.
When the "auto gain" button is set to
“adjustable,” the TEL-14 adjusts
the audio gain to limit the send and receive telephone line signals to
levels defined by the "send volume" and "receive volume" controls.
The TEL-14 remembers the setting of the "auto gain" button when
power is turned off.
Summary of Contents for ECLIPSE TEL-14
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