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Fiber Optic Video Communications 
Unidirectional Video Products
MODEL LM140 |
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| MODEL
LM140 |
1 Channel FM Video System |
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| DESCRIPTION
The LM140 is a Frequency Modulated (FM)
state-of-the-art fiber optic video system
that transmits and receives a real time
video signal over one multimode or singlemode
fiber. PAL, SECAM or NTSC formats, in B&W
or color, are seamlessly transmitted distances
of up to 6Km (multimode) and 100 Km (singlemode).
All Lascomm products requires no user adjustments
& features superior quality and performance.
The capabilities of the Model 140 are enhanced
by it's compatibility with Lascomm's PC
based SpectraSmart™ Network Management
and Diagnostic software system. See the
SpectraSmart™ brochure for more details. |
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| FEATURES
- Surface Mount Technology (SMT) for High Reliability
and Repeatability
- Compact Modules and Card Units
- Laser Based Back-Biased Photo Detection Circuitry
for Stable Optical Output Over Full Temperature
Range (Singlemode)
- 10MHz Video Bandwidth
- Meets EIARS-170, RS-343A
- Frequency Modulated (FM) Transmission
- Input Voltage Range: 12VDC-35VDC, 9VAC-24VAC
(Modules)
- SpectraSmart™ Compatible
- Meets NEMATS1 fTS2 and Caltrans Specifications
- Utilizes Internal Switching Power Supplies
- Meets RS-250C Transmission Requirements
- Compatible with All NTSC, PAL, or SECAM Systems
- LED Status Indicators Provide Rapid Indication
of Critical Operating Parameters
- Automatically Resettable Solid-State Current
Limiters on All Power Lines: Provides Equipment
Protection
- Wide Optical Dynamic Range: Optical Attenuators
are Never Required
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CONFIGURATIONS
The 140 product family is available in both stand-alone
modules and rack mount cards. The cards can be
installed in all of Lascomm's card chassis, desk
chassis and 19" racking frames. This system
can be configured in either star (module to rack)
ortrunking (rack to rack) configurations. The
LM140 is compatible with the LM190 triple transmitter
and receiver cards for high-density applications.
APPLICATIONS
- Security and Surveillance
- Military Communications
- Intelligent Transportation System (ITS)
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SPECIFICATIONS |
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Video |
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Format..................................................
Voltage/Impedance................................
Bandwidth.............................................
Differential Gain.....................................
Differential Phase...................................
SNR......................................................
Return Loss...........................................
Field Tilt................................................
Carrier Frequency................................... |
NTSC, PAL, SECAM
1 Vp-p, 75 Ohm, 1.5 Vp-p
max.
5 Hz to 10 MHz @ -3 dB
<2% typical
<1.5° typical
67 dB weighted*
>30 dB
<0.5% max.
70 MHz |
* As per RS-250C, measured @ 1Km
(multimode), @ 10Km (singlemode) |
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Connectors |
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Video...................................................
Optical.................................................
Power..................................................
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75 Ohm BNC (Gold Center
Pin)
ST™, FC
2 Pin Terminal Block |
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Power**
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Transmitter Card..................................
Transmitter Module..............................
Reciever Card......................................
Reciever Module.................................. |
2
W
80 mA @ 24 VAC
2 W
90 mA @ 24 VAC |
** Due to variations of drivers
and diagnostic options power shown
at maximum measurements |
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Indicator
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Module (Bi-Color LED):
Green..................................................
Red.....................................................
Off......................................................
Card (LED):
Red.....................................................
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Video Sync Present
Video Sync Absent
Absence of Power
Power On
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Physical
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Dimensions:
Module***...........................................
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Card....................................................
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Weight:
Module................................................
Card...................................................
Number of Rack Slots............................
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90 mm (3.5")L, 60
mm (2.3")W
25 mm (1")H
160 mm (6.3")L, 20
mm (0.8")W
100 mm (4")H
858 g (3 oz.)
450 g (16 oz.)
One
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*** Add 30mm to include mounting
flanges |
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Enviromental
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Operating Temperature..........................
Storage Temperature.............................
Relative Humidity.................................. |
-40°C
to +74°C
-55°C to +85°C
0 to 95% Non-condensing |
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Quality |
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MTBF...................................................
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>290,000
hours @ Ground Fix
35°C per MIL217F |
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Optical
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Fiber Type/Size
(um) |
Optical Output
(dBm) |
Reciever Sensitivity
(dBm) |
Optical Budget
(dB) |
Wavelength
(nm) |
Optical
Connector |
Optical Dynamic
Range (dB) |
| Multimode* (SLED) |
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| 62.5/125 |
-13 |
-33 |
20** |
850 |
ST |
39 |
| 62.5/125 |
-16 |
-33 |
17** |
1300 |
ST |
39 |
| Singlemode (Laser) |
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| 9/125 |
-7*** |
-35 |
28 |
1310 |
ST,FC |
41 |
| 9/125 |
-10*** |
-35 |
25 |
1550 |
ST,FC |
41 |
* Distance is limited to fiber
loss, splices and fiber bandwidth
** For 50/125μm fiber, subtract
3dB
*** Higher output lasers available |
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