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There are three DIP switches on each of the four LLA-4 printed circuit boards to allow for different ringing protocols for each
channel.
DIP
Description
Switch 1
Detects typical 20Hz AC ringing (factory default)
OFF
Detects polarity reversal DC ring signaling.
ON
Note: This mode is polarity sensitive. If connected in
reverse polarity, that LLA-4 channel will ring continuously.
See the diagram at the right for proper polarity.
DIP
DIP
Description
Switch 2
Switch 3
Ring OFF - Incoming ringing is not passed through the unit.
OFF
OFF
The outgoing ring signal will "follow" the cadence of the incom-
OFF
ON
ing ring signal.
A double ring signal will be "filled in" so the outgoing ring will
ON
OFF
look like one longer ring signal (factory default).
The outgoing ring signal will be "forced" to a full 2 seconds, no
ON
ON
matter what the incoming ring signal is. Note: Not recom-
mended if Caller ID is being used.
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When the LLA-4 channel 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-4 channel 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-4 channel to the OPX phone. When the OPX phone goes back in hook, the LLA-
4 channel will release the system line.
When ringing is detected from the system, the LLA-4 channel'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-4 channel 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-4 to the OPX phone. When the OPX phone goes back in hook, the LLA-4 channel will release the system line.
The front panel LEDs operate as follows for each of the four channels:
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.
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Due to the dynamic nature of the product design, the information contained in this document is subject to change without notice. Viking Electronics, and its affiliates and/or
subsidiaries assume no responsibility for errors and omissions contained in this information. Revisions of this document or new editions of it may be issued to incorporate
such changes.
Fax Back Doc 620
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LINE IN
FROM SYSTEM
(+)
Tip
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F
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Printed in the U.S.A.
Internal View of the LLA-4
(-)
Ring
ON
ON
OFF
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DIP Switches
(shown in factory
3
default positions)
1
5
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3
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5
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