Viking DLE-200B Technical Practice page 3

P r o g r a m m
P r o g r a m m
There are three DIP switches on the LLA-1 printed circuit board to allow for different ringing protocols.
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, the LLA-1 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.
O p e r a t i o n
O p e r a t i o n
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.
i n g
i n g
Internal View of the LLA-1
LINE IN
FROM SYSTEM
(+) (-)
Tip Ring
ON
OFF
ON
DIP Switches
(shown in factory
1 2 3
default positions)