There are three DIP switches on the
LLA-1
printed circuit board to allow for different ringing protocols.
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DIP
Switch 1
OFF
ON
Description
Detects typical 20Hz AC ringing (factory default)
Detects polarity reversal DC ring signaling.
Note:
This mode is polarity sensitive. If connected in
reverse polarity, the
LLA-1
will ring continuously. See the
diagram at the right for proper polarity.
DIP Switches
(shown in factory
default positions)
ON
OFF
1 2 3
ON
Description
Ring OFF - Incoming ringing is not passed through the unit.
The outgoing ring signal will “follow” the cadence of the incom-
ing ring signal.
A double ring signal will be “filled in” so the outgoing ring will
look like one longer ring signal (factory default).
The outgoing ring signal will be “forced” to a full 2 seconds, no
matter what the incoming ring signal is.
Note:
Not recom-
mended if Caller ID is being used.
DIP
Switch 3
OFF
ON
OFF
ON
DIP
Switch 2
OFF
OFF
ON
ON
LINE IN
FROM SYSTEM
(+)
Tip
(-)
Ring
Internal View of the LLA-1
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When the
LLA-1
is sitting in the idle state, it provides -48VDC talk battery out the long loop screw terminals for the OPX
phones (or trunk input).
When the OPX phone goes off hook, the system line is seized, talk path is opened, and system dial tone is passed through
the
LLA-1
to the OPX phone. Touch Tone or 10pps Pulse digits can now be dialed. If the system provides a CPC signal, it
will be passed through the
LLA-1
to the OPX phone. When the OPX phone goes back in hook, the
LLA-1
will release the
system line.
When ringing is detected from the system, the
LLA-1
's internal sine wave ring generator produces a 20Hz 105V AC ring
signal to the OPX phone. Re-ring cadence is selectable (see programming). If Caller ID data is received after the first ring,
it will be amplified and passed on to the OPX phone. When the OPX phone answers, the
LLA-1
will answer the system line,
and provide talk path through the unit. If the system provides a CPC signal, it will be passed through the
LLA-1
to the OPX
phone. When the OPX phone goes back in hook, the
LLA-1
will release the system line.
The front panel LEDs operate as follows:
PWR
LED - Lights steady when the unit is powered up, and winks off to show incoming ring signal detection.
RING
LED - Lights to show re-ring cadence going out of the long loop to the phone.
IN USE
LED - Lights when the phone is off-hook to show the line is in use.
CPC
LED - Lights to show a CPC signal is detected and being re-generated out the long loop to the phone.
