User Manual

46
AUTO
CHANGEOVER
LT4441/LT 4442/LT444/LT 4440
Changeover
(LT4441/LT 4442)
(LT444/LT 4440)
Error Display
Total Error LED
Error Channel LED
Panel Key Lock
Time to Key Lock
External Control
(REMOTE) Connector
Application
Connector Type
Dimensions and Weight
Accessories
Notifies errors by illuminating the error LED on the panel.
Detects the channel causing the error and shows the
channel by illuminating the corresponding LED.
The key lock is automatically enabled when key oper-
ation is not detected for 60 s.
For external remote control.
9-pin Dsub connector
426 (W) x 44 (H) x 560 (D) mm(LT 444/LT 4441)
426 (W) x 44 (H) x 400 (D) mm(LT 4440/LT 4442)
(excluding protrusions), 4 kg
16 3/4 (W) x 1 3/4 (H) x 22 (D) inch, (LT 444/LT 4441)
16 3/4 (W) x 1 3/4 (H) x 15 4/5 (D) inch, (LT 4440/LT 4442)
(excluding protrusions), 8.8 lbs
Rack supports
........................................................
2
Rack support attachment screws
...........................
4
Power cord
.............................................................
1
Instruction manual
..................................................
1
The units in the changeover series automatically switch the sig-
nal from the primary signal to the backup signal when problems
are detected in the primary signal. Two input signals (primary
and backup) are connected to a changeover unit, and the unit
detects errors in the amplitude of the primary input signal.
A single unit provides 11 channels. Depending on the configura-
tion of the internal switches, SDI, AES/EBU digital audio, analog
black burst, tri-level sync, and word-clock signals can be
received by the channels.
When a unit switches from a primary signal to a backup signal, it
lights the panel LED of the channel that is causing the problem.
The LT 4441 and LT 444 can be combined with the LT 443D
Multiformat Video Generator to form a system. The LT 4442 and
LT 4441 can be combined with the LT 4400 Multiformat Video
Generator to form a system that is 2U in size.
FEATURES
•Inputs and Outputs
Each unit is equipped with 11 sets of channels (each set
consists of a primary input, a backup input, and an output).
•Electronic Switches (LT 4441 and LT 4442)
Electronic switches are used to switch channels 4 to 11.
Also, high-speed detection circuits are used to detect errors.
These enable units to switch to a backup signal with barely
any disturbances appearing on the screen when problems
such as interruptions occur in a primary signal.
The channel 9 and 10 inputs are dedicated inputs for
AES/EBU digital audio signals. The channel 11 input is a
dedicated input for word-clock signals. With TTL input, units
generate +5 V CMOS output.
•Time until Determination Starts
The delay for starting the error monitoring at power up can
be set to FAST or SLOW depending on the rise time of the
system signal source that a unit is connected to.
•Determination Criteria of the Signal Level
By using the internal preset switches, you can switch
between the level detection of SDI, NTSC or PAL analog
black burst, and HD analog tri-level sync signals. AES/EBU
digital audio and word-clock signals (on the LT 4441 and LT
4442) are received through dedicated connectors.
•Error Display
When a signal level error is detected, the unit lights the error
LED on the panel as well as an LED that indicates the chan-
nel that is causing the problem. This feature allows quick
investigation of the problem.
SPECIFICATIONS
LT 4441 LT 4442 LT 444 LT 4440
Inputs
10 input connectors
1 input connectors (TTL input)
1 input each for 11 connectors
Outputs
10 output connectors
1 output connectors (CMOS)
1 output each for 11 connectors
Dimensions
560 mm,
22 in.
400 mm,
15 5/4 in.
560 mm,
22 in.
400 mm,
15 5/4 in.
Switch
CH1 to CH3 : Relay Switches
CH4 to CH11 : Electronic Switches
Relay Switches
Inputs and
Outputs
Characteristics
CH1 to CH3
HD-SDI, SD-SDI, NTSC/PAL Analog
black burst, HD Tri-level sync signal
CH4 to CH8
NTSC/PAL Analog black burst,
HD Tri-level sync signal
CH9, CH10
AES/EBU Digital Audio
CH11
Word clock (TTL)
CH1 to CH11
SD-SDI
NTSC/PAL Analog black burst
HD Tri-level sync signal
AES/EBU Digital Audio
CH1 to CH6
HD-SDI
LeaderInstrumentsCorporation
e‐mail:[e-mail]
web:www.LeaderAmerica.com
6484CommerceDriveCypress,CA90630
NOTE Th LT444 d LT4440 h b di ti d
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LeaderInstrumentsCorporation
e‐mail:[e-mail]
web:www.LeaderAmerica.com
6484CommerceDriveCypress,CA90630
USATollFree:1(800)645‐5104
International : 1 (714) 527
9300
e‐mail:[e-mail]
web:www.LeaderAmerica.com
USATollFree:1(800)645‐5104
International:1(714)527‐9300
LeaderInstrumentsCorporation
e‐mail:[e-mail]
web:www.LeaderAmerica.com
6484CommerceDriveCypress,CA90630
USATollFree:1(800)645‐510 4
International:1(714)527‐9300
International

:

1

(714)

527
‐
9300
Leader Instruments
Corporation
e‐mail:Sales
@
LeaderAmerica.com USATollFree:1
(
800
)
645‐5104
LeaderInstrumentsCorporation
e‐mail:[e-mail]
web:www.LeaderAmerica.com
6484CommerceDriveCypress,CA90630
USATollFree:1(800)645‐510 4
International:1(714)527‐9300
LeaderInstrumentsCorporation
e‐mail:[e-mail]
web:www.LeaderAmerica.com
6484CommerceDriveCypress,CA90630
USATollFree:1(800)645‐510 4
International:1(714)527‐9300
Leader

Instruments

Corporation
@
web:www.LeaderAmerica.com
6484CommerceDriveCypress,CA90630
()
International:1(714)527‐9300
LeaderInstrumentsCorporation
e‐mail:[e-mail]
web:www.LeaderAmerica.com
6484CommerceDriveCypress,CA90630
USATollFree:1(800)645‐5104
International:1(714)527‐9300
LeaderInstrumentsCorporation
e‐mail:[e-mail]
web:www.LeaderAmerica.com
6484CommerceDriveCypress,CA90630
USATollFree:1(800)645‐5104
International : 1 (714) 527
9300
e‐mail:[e-mail]
web:www.LeaderAmerica.com
USATollFree:1(800)645‐5104
International:1(714)527‐9300
LeaderInstrumentsCorporation
e‐mail:[e-mail]
web:www.LeaderAmerica.com
6484CommerceDriveCypress,CA90630
USATollFree:1(800)645‐5104
International:1(714)527‐9300
International

:

1

(714)

527
‐
9300
Leader Instruments
Corporation
e‐mail:Sales
@
LeaderAmerica.com USATollFree:1
(
800
)
645‐5104
LeaderInstrumentsCorporation
e‐mail:[e-mail]
web:www.LeaderAmerica.com
6484CommerceDriveCypress,CA90630
USATollFree:1(800)645‐5104
International:1(714)527‐9300
LeaderInstrumentsCorporation
e‐mail:[e-mail]
web:www.LeaderAmerica.com
6484CommerceDriveCypress,CA90630
USATollFree:1(800)645‐5104
International:1(714)527‐9300
Leader

Instruments

Corporation
@
web:www.LeaderAmerica.com
6484CommerceDriveCypress,CA90630
()
International:1(714)527‐9300