MLC-24
Telecommunication Peripheral Products
Message Waiting
Lamp Controller
Technical Practice
March 2, 1998
Add Message Waiting Lamps for Voice
Mail....On any Telephone System!
With Viking’s MLC-24 you can integrate visual
message waiting indication with nearly any
phone system...even those phone systems
which do not support message lamps.
The MLC-24 is compatible with virtually any
voice messaging system with “out call” or
“dispatch” feature. It can also be activated
manually from a Touch Tone phone. The lamps
can be reset by the voice mail system or from
the user’s telephone.
Commands are sent to the controller via C.O. line or analog PABX/KSU station or trunk
port. Up to four MLC-24 controllers can be connected to a single line.
Features
Applications
• Each MLC-24 controls up to 24 message
waiting lamps
• Voice mail systems that don’t provide message
waiting voltage
• Compatible with 90 to 125V message waiting
phones
• Remote voice mail systems
• Staff “In - Out” board
• Compatible with LED’s or Viking LM-1 or LM-2
retrofit message waiting lamp kit
• “Do Not Disturb” lights
• Displays both steady lamp or flash for urgent
messages
Sales...(715) 386 - 8861
• Expandable in multiples of 24 lamps
Specifications
Power: 120V AC/13.8V AC 1.25A, UL listed, adapter provided
Dimensions: 8.25mm x 160mm x 44mm (8.25” x 6.25” x 1.75”)
Shipping Weight: 1.36 kg (3 lbs.)
• Uses existing C.O. lines or analog PABX/KSU
stations
• Built in diagnostics to aid installer
Environmental: 0°C to 32°C (32°F to 90°F) with 5% to 95% non-
condensing humidity
Connections: (1) RJ21X male, (1) RJ21X female, (1) RJ11 com
port
Made in the U.S.A.
B. Electronic or Digital Phone Installation with LM-2 Message Waiting Lamps
Station/Trunk Switch - Switch to STATION when
connecting the "control line" to a C.O. line or an analog
PABX/KSU station. Switch to TRUNK when connecting the
"control line" to a dedicated phone or unused (loop start)
trunk input.
STATION
TRUNK
J2
J1
RESET
COM
Optional LM-24D
Reset Button
Optional LM-12W
MESSAGE WAITING
LAMP CONTROLLER
Green
Red
VIKING©
or
MODEL MLC-24
(Fax Back Document 665)
(Fax Back Document 670)
NEON
LED
RJ21X
FEMALE
RJ21X
MALE
1
2
3
4
Neon/LED Switch - Switch to LED when using an LED or
POWER
LM-2 on a separate pair.
VIKING ELECTRONICS, INC. HUDSON, WI 54016
Black
.75”
Yellow
LM-2 (Fax Back Document 660)
KSU/Digital Phone with LM-2
1.00”
RJ21 Male
Connector
(not included)
RJ21 Female
Connector
(not included)
Color
Pins Color
Polarity Pins
Note: Electronic or digital telephones usually require
a separate dedicated pair for operation of the message
waiting lamps. When a dedicated pair is used, the
MLC-24 can provide low voltage for direct operation of
LED indicators, such as the LM-2.
+
-
BL/W
O/W
G/W
BN/W
S/W
1
2
3
4
5
26
1
W/BL
BL/W
W/O
O/W
W/G
G/W
W/BN
BN/W
LED 1
+
-
+
-
27
2
28
3
LED 2
LED 3
BL/R
O/R
6
7
+
-
29
4
LED 4
G/R
BN/R
S/R
BL/BK
O/BK
8
9
10
11
12
+
-
+
-
+
-
30
5
31
6
32
7
W/S
S/W
R/BL
BL/R
R/O
O/R
LED 5
LED 6
Programming
A. Assigning Group Lamp Numbers
LED 7
+
-
+
-
+
-
+
-
33
8
34
9
35
10
R/G
G/R
R/BN
BN/R
R/S
S/R
LED 8
Color
Pins
LED 9
13
G/BK
Additional MLC-24’s can be added for controlling
up to 96 message waiting lights. Set the dip
switches as shown below.
14 BN/BK
LED 10
LED 11
LED 12
LED 13
LED 14
LED 15
LED 16
LED 17
LED 18
LED 19
LED 20
LED 21
LED 22
LED 23
LED 24
15
16
17
18
19
20
21
22
23
24
S/BK
BL/Y
O/Y
GN/Y
BN/Y
S/Y
BL/V
O/V
GN/V
BN/V
36 BK/BL
11 BL/BK
+
-
+
-
+
-
+
-
+
-
+
-
37
12
38
13
BK/O
O/BK
BK/G
G/BK
Dip Switch
Group Number
Assignment
1 - 24
1
2
39 BK/BN
14 BN/BK
40
15
41
16
42
17
OFF OFF
ON OFF
OFF ON
ON ON
BK/S
S/BK
Y/BL
BL/Y
Y/O
O/Y
25 - 48
49 - 72
73 - 96
+
-
43
18
Y/GN
GN/Y
Unused PABX
Trunk Input or
Analog station
+
-
+
-
+
-
+
-
44
19
45
20
46
21
47
22
Y/BN
BN/Y
Y/S
S/Y
V/BL
BL/V
V/O
O/V
B. Other Dip Switch Settings
Dip switch 3 and 4 can be used to set message
waiting light parameters and operational modes.
+
-
+
-
48
23
49
24
V/GN
GN/V
V/BN
BN/V
1000 foot
Switch
Feature
maximum run
3
3
ON
When using hard wired LED’s
using 26 AWG wire
OFF Use with LM-1’s, LM-2’s or message
waiting phones
25T1
25R1
50
25
V/S
S/V
or
Control Line
4
4
ON
Test pattern or diagnostics
OFF Normal operation
Control Phone
C.O. Line
Operation
A control phone connected directly to the MLC-24’s “control line” controls the lamps. The "control line" may also be
connected to a C.O. line, analog PABX/KSU station, or an unused C.O. port.
One MLC-24 controller can serve 24 different station lamps, plus up to three 24 line status displays (LM-24D or LM-
12W) for the receptionist(s). Up to four MLC-24’s can be installed on a single extension or line.
In voice mail applications the “dispatch” or “out-call” feature is used to call the extension assigned to the MLC-24, which
answers and provides a 500 Hz tone. The voice mail system then sends a three digit DTMF code that specifies the
status of an individual lamp. For example, a Touch Tone code of “1, 24” would cause lamp 24 to be off, a “2, 24” would
cause it to be on steady, a “3, 24” would cause it to flash and a “4, 24” would cause it to fast flash. When the three digit
code is complete, the MLC-24 hangs up. The 3 digit code can also be entered manually from any Touch Tone phone.
In applications where a ringing extension is not available, the MLC-24 can be programmed to provide talk battery for
direct connection to an unused trunk input, a standard DTMF phone or the voice mail “dispatch” or “out-call” port, if
compatible.
Signaling the MLC-24...
Enter Digits
1 + xy*
A. On Premise Operation
1. ...to turn lamp OFF at station xy*
2. ...to turn lamp ON at station xy*
3. ...to flash a lamp at station xy*
4. ...to fast flash a lamp at station xy*
5. ...to turn all lamps OFF
When the MLC-24 is connected to a station circuit of a
PABX, the voice mail system or user must first dial the
station (extension) number connected to the MLC-24’s
“control line.” The MLC-24 will answer with a steady
tone. The command codes can then be entered as
shown in the table to the right.
2 + xy*
3 + xy*
4 + xy*
1 - 4 + 99
* xy refers to numbers 1 - 96
B. Off Premise Operation
When the MLC-24 is located in a remote facility, the voice mail system or user must call the telephone number of the
phone line connected to the “control line” of the MLC-24 (J2 Pins 25, 50). The MLC-24 will answer with a steady
tone. The command codes can then be entered as shown in the table.
C. Message Waiting Lamp Illumination
1. Neon Message Waiting Phones and/or LM-1 Modular Message Waiting Lamp Retrofit Kit
This kit will illuminate when the receiver is on-hook. They will go out when the receiver is off-hook and go on as
the receiver is returned on-hook. The lamp may be extinguished by an off Touch Tone code or by momentarily
(.25 - 2 seconds) going off hook.
2. LM-2 LED Message Waiting Lamp Kit
This kit will illuminate immediately and remain on until the LM-2 switch is depressed momentarily (.25 - 2
seconds) or an off Touch Tone code is issued to extinguish the LED.
3. LED’s
These will illuminate immediately and remain on until an “off” Touch Tone code is issued to extinguish the LED.
D. Power Failure
In the event of AC power failure, the message waiting lamps will not function. All telco operations will operate as
normal.
E. Special Features
1. With switch positions 1 and 3 in the OFF position and 2 and 4 in the ON position, the display will indicate on or
off hook condition for 24 lines (off-hook = LED is on, on-hook = LED is off). Note: Depress the reset button on
the MLC-24 after changing switch positions.
2. With switch positions 2 and 3 in the “off” position and 1 and 4 in the “on” position, the installer can generate a test
pattern that will aid in the installation. The MLC-24 will turn the lamps on one at a time, then turn them all off.
This will continue until the switches are placed back into position for normal operation.
Product Support Line...(715) 386-8666
Fax Back Line...(715) 386-4345
Due to the dynamic nature of the product design, the information contained in this document is subject to change without notice. Viking
Electronics, its affiliates and/or subsidiaries assume no responsibility for errors and/or omissions contained in this information. Revisions of
this document or new editions of it may be issued to incorporate such changes.
Fax Back Doc # 675
Printed in the U.S.A.
ZF290220 Rev C
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