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LTM-4100
Multiformat 4x1 Selective Switcher
(Component, Y/C, Composite, Balanced Audio, RS422)
O
N
PERATIONAL
OTES
The LTM-4100 product has been developed for use in broadcast facilities. All standards and performance specifications are designed for broadcast
equipment. Balanced zero offset signals are necessary in most cases for proper operation. Signals with high DC offset will not pass properly. Audio
signals should be balanced at 0dBm. The LTM-4100 is set for unity gain for balanced audio. Should it be required to handle unbalanced signals, it
is possible to use an adaptor XLR to RCA cable where the negative phase pin of the XLR is grounded.
Should it required to add more audio distribution to the LTM-4100 it is advised that the LAIRD LTM-ADA6 be used to provide a equal quality bal-
anced signal distribution capability.
When using a PC for serial control, a standard 9-pin male to female cable may be used up to distances of 100 feet.
Programmers who wish to write their own control code may contact Laird Telemedia Technical Support at 845-339-9555, Monday - Friday, 10AM to
4PM EST.
S
O
WITCHER
PERATION
4x1 Selective Switcher
After power up, the unit will parade the entire bank of switch LEDs. This is a self diagnostic which when completed indicates that the unit is ready
to operate. Connect all the required cables to the unit's rear panel. The input source signal must be connected to connectors marked "INPUT". The
output signals must be connected to connectors marked "OUTPUT". Please pay careful attention to the nomenclature of the rear panel. It is clear-
ly marked for ease of connections.
RS422 Switching Section
The RS422 section is a single 4x1 switcher. Select which machine is needed for RS422 control. Be aware that despite the fact that the LTM-4100 can
handle a total of 12 devices for video(all 3 formats), and 4 devices for audio, the RS422 section is designed for only 4 devices. Therefore, select the
four devices which need RS422 control and plug the 9-pin cables into the corresponding port on the rear panel. Plug the RS422 controlling device
(editor NLE) into the RS422 I/O port. The front panel switches also control the RS422 switching as a "secondary priority protocol". This will be
explained below.
Tagging RS422
As discussed previously, there is only one 4x1 RS422 section. This means that only 4 machines at any time can be assigned RS422 control to the
controlling device. Select the machines which require RS422 and plug their 9pin Dsubs into the similarly marked numbered position to match the
machine. Example: VTR#1 Component has RS422, VTR#2 Component has RS422, VTR#3 YC has RS422, VTR#4 YC has RS422. Now connect The
RS422 for VTR#1 to 9pinDsub#1, VTR#2 to 9pin#2, VTR#3 to 9pinDsub#3, VTR#4 to 9pin Dsub#4. Now the front panel control switches will work as
follows: The first press will enable the primary function: switching Video(component-YC-composite) and Balanced audio as a 4x1 switcher. Pressing
the button the second time will tag the RS422 connected to that port. Pressing the button a third time clears the switch and disables all signals.
In the event all four VTRs are used and they all have RS422, then the RS422 feature is now dedicated to the Component VTRs and are not available
for any other device. If any other switch is pressed twice, the RS422 will switch away and treat that switch as priority. Likewise if that switch is
pressed on a different platform switch bank, then that bank and that number will take priority.
Balanced Audio Switching
The LTM-4100 is equipped with a 4x1 dual channel balanced audio switcher. You may choose which signal needs audio and correspond that output
with audio. The LTM-4100 does not have audio for every video format, since that would require 12 channels of audio. However, since every video
feed does not require audio, you can pick and choose where complimentary audio is required and connect it accordingly.
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800-898-0759 • 845-339-9555 • 2000 Sterling Road • Mount Marion, NY 12456 • www.lairdtelemedia.com
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