Viking MLC-24 Instructions for use

• Voice mail systems that don’t provide message
waiting voltage
• Remote voice mail systems
• Staff “In - Out” board
• “Do Not Disturb” lights
• Each MLC-24 controls up to 24 message
waiting lamps
• Compatible with 90 to 125V message waiting
phones
• Compatible with LED’s or Viking LM-1 or LM-2
retrofit message waiting lamp kit
• Displays both steady lamp or flash for urgent
messages
• Expandable in multiples of 24 lamps
• Uses existing C.O. lines or analog PABX/KSU
stations
• Built in diagnostics to aid installer
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.
Add Message Waiting Lamps for Voice
Mail....On any Telephone System!
VIKING©
Technical Practice
Telecommunication Peripheral Products MLC-24
Message Waiting
Lamp Controller
March 2, 1998
Features Applications
Sales...(715) 386 - 8861
Made in the U.S.A.
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.)
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
Specifications
[email protected]
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.
http://www.VikingElectronics.com
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.

Installation
A. Centrex or PABX Installation with Standard Phones
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.
Neon/LED Switch - Switch to
NEON when using standard
90-125V message waiting
phones or Viking Model LM-1
on standard phones.
Connect the Yellow and Black to the positive of the talk
battery, normally earth ground (see
Important below).
Optional LM-24D
Yellow Black
Green
Red
Reset Button
After wiring J1, the polarity may be tested using a
volt meter. An easier method is to use a Viking
model LM-24D display in conjunction with the
MLC-24’s built in diagnostics as follows:
1. Be sure that J2 is disconnected and that J1 is
connected and wired.
2. Make sure the BK and Y of the “COM” RJ-14
are connected to the earth ground (positive side
of the battery).
3. Connect a Viking LM-24D display to the COM
jack.
4. Set the dip switches as
shown below.
5. Momentarily press the
reset switch. If any LED’s
remain lit, reverse tip and
ring (going to J1) for that
line, and retest.
Dip Switch
1
2
3
4
Setting
OFF
ON
OFF
ON
Important: The Yellow and Black of the RJ-14
jack, “COM”, MUST be connected to the positive of
the talk battery for proper reference. This is
normally earth ground on most C.O. lines or
analog PABX/KSU stations.
Note: This application requires that the correct
polarity (tip=positive, ring=negative) be observed
on J1 for proper operation.
1-24 analog
PABX/KSU
stations
1 - 24 C.O.
lines or analog
PABX/KSU
stations
VIKING©
MODEL MLC-24
VIKING ELECTRONICS, INC. HUDSON, WI 54016
MESSAGE WAITING
LAMP CONTROLLER
RJ21X
FEMALE RJ21X MALE
J1 J2
STATION
COM
RESET
TRUNK
NEON
LED
POWER
1 2 3 4
T1
R1
T2
R2
T3
R3
T4
R4
T5
R5
T6
R6
T7
R7
T8
R8
T9
R9
T10
R10
T11
R11
T12
R12
26
1
27
2
28
3
29
4
30
5
31
6
32
7
33
8
34
9
35
10
36
11
37
12
W/BL
BL/W
W/O
O/W
W/G
G/W
W/BN
BN/W
W/S
S/W
R/BL
BL/R
R/O
O/R
R/G
G/R
R/BN
BN/R
R/S
S/R
BK/BL
BL/BK
BK/O
O/BK
T13
R13
T14
R14
T15
R15
T16
R16
T17
R17
T18
R18
T19
R19
T20
R20
T21
R21
T22
R22
T23
R23
T24
R24
38
13
39
14
40
15
41
16
42
17
43
18
44
19
45
20
46
21
47
22
48
23
49
24
BK/G
G/BK
BK/BN
BN/BK
BK/S
S/BK
Y/BL
BL/Y
Y/O
O/Y
Y/GN
GN/Y
Y/BN
BN/Y
Y/S
S/Y
V/BL
BL/V
V/O
O/V
V/GN
GN/V
V/BN
BN/V
Circuit Pins Color 1T1
1R1
2T1
2R1
3T1
3R1
4T1
4R1
5T1
5R1
6T1
6R1
7T1
7R1
8T1
8R1
9T1
9R1
10T1
10R1
11T1
11R1
12T1
12R1
26
1
27
2
28
3
29
4
30
5
31
6
32
7
33
8
34
9
35
10
36
11
37
12
W/BL
BL/W
W/O
O/W
W/G
G/W
W/BN
BN/W
W/S
S/W
R/BL
BL/R
R/O
O/R
R/G
G/R
R/BN
BN/R
R/S
S/R
BK/BL
BL/BK
BK/O
O/BK
13T1
13R1
14T1
14R1
15T1
15R1
16T1
16R1
17T1
17R1
18T1
18R1
19T1
19R1
20T1
20R1
21T1
21R1
22T1
22R1
23T1
23R1
24T1
24R1
38
13
39
14
40
15
41
16
42
17
43
18
44
19
45
20
46
21
47
22
48
23
49
24
BK/G
G/BK
BK/BN
BN/BK
BK/S
S/BK
Y/BL
BL/Y
Y/O
O/Y
Y/GN
GN/Y
Y/BN
BN/Y
Y/S
S/Y
V/BL
BL/V
V/O
O/V
V/GN
GN/V
V/BN
BN/V
25T1
25R1 50 25 V/S S/V
Circuit Pins Color
RJ21 Female
Connector
(not included)
RJ21 Male
Connector
(not included)
Control Lineor
Unused
PABX Trunk
Input or Analog Station
Control
Phone
Most 48 volt C.O. line or analog PABX/KSU
stations require no station rewiring as the 90 to
125 volt signal is superimposed on the existing tip
and ring. The lamp controller is compatible with
standard 90 to 125 volt message waiting lamp
phones as well as Viking model LM-1 retrofit
message waiting lamp kit installed on modular
analog station sets.
1000 foot
maximum run
using 26 AWG
wire
or
Optional LM-12W
VIKING ELECTRONICS
VIKING©
MODEL LM-1
Message Waiting
Lamp
HUDSON, WI 54016 LM-1 (Fax Back Document 660)
(Fax Back Document 665)
(Fax Back Document 670)
Diagnostics
C.O. Line

Group Number
Assignment
1 - 24
25 - 48
49 - 72
73 - 96
2
OFF
OFF
ON
ON
RJ21 Female
Connector
(not included)
RJ21 Male
Connector
(not included)
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.
Neon/LED Switch - Switch to LED when using an LED or
LM-2 on a separate pair.
Green
Red
Reset Button
25T1
25R1 50
25 V/S S/V
KSU/Digital Phone with LM-2
VIKING©
MODEL MLC-24
VIKING ELECTRONICS, INC. HUDSON, WI 54016
MESSAGE WAITING
LAMP CONTROLLER
RJ21X
FEMALE RJ21X MALE
J1 J2
STATION
COM
RESET
TRUNK
NEON
LED
POWER
1 2 3 4
A. Assigning Group Lamp Numbers
Additional MLC-24’s can be added for controlling
up to 96 message waiting lights. Set the dip
switches as shown below.
Dip Switch
1
OFF
ON
OFF
ON
B. Other Dip Switch Settings
Switch
3
3
4
4
ON
OFF
ON
OFF
Feature
When using hard wired LED’s
Use with LM-1’s, LM-2’s or message
waiting phones
Test pattern or diagnostics
Normal operation
Dip switch 3 and 4 can be used to set message
waiting light parameters and operational modes.
13
14
15
16
17
18
19
20
21
22
23
24
Pins Color
G/BK
BN/BK
S/BK
BL/Y
O/Y
GN/Y
BN/Y
S/Y
BL/V
O/V
GN/V
BN/V
1
2
3
4
5
6
7
8
9
10
11
12
BL/W
O/W
G/W
BN/W
S/W
BL/R
O/R
G/R
BN/R
S/R
BL/BK
O/BK
Pins Color
LED 13
LED 14
LED 15
LED 16
LED 17
LED 18
LED 19
LED 20
LED 21
LED 22
LED 23
LED 24
38
13
39
14
40
15
41
16
42
17
43
18
44
19
45
20
46
21
47
22
48
23
49
24
BK/G
G/BK
BK/BN
BN/BK
BK/S
S/BK
Y/BL
BL/Y
Y/O
O/Y
Y/GN
GN/Y
Y/BN
BN/Y
Y/S
S/Y
V/BL
BL/V
V/O
O/V
V/GN
GN/V
V/BN
BN/V
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
26
1
27
2
28
3
29
4
30
5
31
6
32
7
33
8
34
9
35
10
36
11
37
12
W/BL
BL/W
W/O
O/W
W/G
G/W
W/BN
BN/W
W/S
S/W
R/BL
BL/R
R/O
O/R
R/G
G/R
R/BN
BN/R
R/S
S/R
BK/BL
BL/BK
BK/O
O/BK
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
LED 1
LED 2
LED 3
LED 4
LED 5
LED 6
LED 7
LED 8
LED 9
LED 10
LED 11
LED 12
Polarity Pins Color
Black
Yellow
Control Line
Unused PABX
Trunk Input or
Analog station
Control Phone
Programming
.75”
1.00”
LM-2 (Fax Back Document 660)
1000 foot
maximum run
using 26 AWG wire
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.
Optional LM-24D
or
Optional LM-12W
(Fax Back Document 665)
(Fax Back Document 670)
or
C.O. Line

Printed in the U.S.A. ZF290220 Rev CFax Back Doc # 675
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.
Product Support Line...[phone] Fax Back Line...[phone]
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.
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.
A. On Premise Operation
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.
Signaling the MLC-24...
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
Enter Digits
1+ xy*
2+ xy*
3 + xy*
4 +xy*
1-4+ 99
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.
B. Off Premise Operation
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.
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.
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.
* xy refers to numbers 1 - 96
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.