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Fiber Optic Video Communications 
Unidirectional Video Products
MODEL LM145 |
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| MODEL
LM145 |
1 Channel FM 30MHz Video System |
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| DESCRIPTION
The LM145 is a Frequency Modulated (FM)
state-of-the-art wideband 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 3Km (multimode) and 100
Km (singlemode). All Lascomm products requires
no user adjustments & features superior
quality and performance. The capabilities
of the Model 145 are enhanced by if 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)
- 30MHz Video Bandwidth
- Meets EIARS-170, RS-343A
- Frequency Modulated (FM) Transmission
- Input Voltage Range: 12VDC-35VDC, 9VAC-24VAC
(Modules)
- SpectraSmart™ Compatible
- Meets NEMA TS1 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 145 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)
or trunking (rack to rack) configurations. The
LM145 is compatible with the LM195 triple transmitter
and receiver cards for high-density applications.
APPLICATIONS
- Security and Surveillance
- Military Communications
- Intelligent Transportation System (ITS)
- Radar
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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 30 MHz @ -3 dB
<2% typical
<1.5° typical
67 dB weighted*
>30 dB
<0.5% max.
150 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
95 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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>340,000
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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