Viking Electronics MLC-24 User Manual
Telecommunication Peripheral Products
Technical Practice
MLC-24
Message Waiting
Lamp Controller
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.
VIKING©
http://www.VikingElectronics.com
E-mail...Sales@VikingElectronics.com
Features Applications
• 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
• Voice mail systems that don’t provide message
waiting voltage
• Remote voice mail systems
• Staff “In - Out” board
• “Do Not Disturb” lights
Sales...(715) 386 - 8861
• Expandable in multiples of 24 lamps
• Uses existing C.O. lines or analog PABX/KSU
stations
• Built in diagnostics to aid installer
Made in the U.S.A.
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.)
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
Installation
A. Centrex or PABX Installation with Standard Phones
STATION
TRUNK
RESET
COM
NEON
LED
1000 foot
maximum run
using 26 AWG
wire
Control Lineor
Yellow Black
1 - 24 C.O.
lines or analog
PABX/KSU
stations
(not included)
Circuit Pins
T1
R1
T2
R2
T3
R3
T4
R4
T5
R5
T6
R6
T7
R7
T8
R8
T9
R9
T10
R10
T11
R11
T12
R12
T13
R13
T14
R14
T15
R15
T16
R16
T17
R17
T18
R18
T19
R19
T20
R20
T21
R21
T22
R22
T23
R23
Unused
PABX Trunk
Input or Analog Station
T24
R24
Control
Phone
RJ21 Male
Connector
26
1
27
2
28
3
29
4
30
5
31
6
32
7
33
8
34
9
35
10
36
11
37
12
38
13
39
14
40
15
41
16
42
17
43
18
44
19
45
20
46
21
47
22
48
23
49
24
J1
RJ21X
FEMALE
VIKING ELECTRONICS, INC. HUDSON, WI 54016
Color
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
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
C.O. Line
J2
MESSAGE WAITING
LAMP CONTROLLER
VIKING©
MODEL MLC-24
RJ21X
MALE
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
13T1
13R1
14T1
14R1
15T1
15R1
16T1
16R1
17T1
17R1
18T1
18R1
19T1
19R1
20T1
20R1
21T1
21R1
22T1
22R1
23T1
23R1
24T1
24R1
25T1
25R15025
1 2 3 4
POWER
RJ21 Female
Connector
(not included)
1-24 analog
PABX/KSU
stations
26
1
27
2
28
3
29
4
30
5
31
6
32
7
33
8
34
9
35
10
36
BK/BL
11
BL/BK
37
12
38
13
39
BK/BN
14
BN/BK
40
15
41
16
42
17
43
18
44
19
45
20
46
21
47
22
48
23
49
24
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/O
O/BK
BK/G
G/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
V/S
S/V
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.
Reset Button
Red
Green
Optional LM-24D
(Fax Back Document 670)
Optional LM-12W
or
(Fax Back Document 665)
Connect the Yellow and Black to the positive of the talk
battery, normally earth ground (see
Important
below).
Neon/LED Switch - Switch to
NEON when using standard
90-125V message waiting
Message Waiting
Lamp
MODEL LM-1
VIKING ELECTRONICS
HUDSON, WI 54016
VIKING©
LM-1 (Fax Back Document 660)
phones or Viking Model LM-1
on standard phones.
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.
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.
Diagnostics
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
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