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Fiber Optic Video Communications 
Unidirectional Video + Audio Products
MODEL LM170 |
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| MODEL
LM170 |
1 Video with 2 Audio or Data Channels |
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| DESCRIPTION
The LM170 is a Frequency Modulated (FM)
state-of-the-art fiber optic system that
transmits a real time video signal plus
two high fidelity audio or data or one audio
and data signal over one multi-mode or singlemode
fiber. PAL, SECAM or NTSC formats, in B&W
or color, are seamlessly transmitted distances
of up to 6Km (multi-mode) and 100 Km (singlemode).
Available formats are Balanced/ Unbalanced
Audio, GenLock, Manchester, Biphase, RS-232D,
RS-422A, 4-20mA Current Loop, TTL, and Contact
Closure. The capabilities of the Model 170
are enhanced by it's compatibility with
Lascomm's PC based SpectraSmart™ Network
Management and Diagnostic software system.
SpectraSmart™ supervises the operating
parameters of the transmission system such
as status on video levels, sync, FM carrier
detect, voltage, temperature, optical levels,
etc., and external equipment which are attached
to the Lascomm equipment. See the SpectraSmart™
brochure for more details. |
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| FEATURES
- Surface Mount Technology (SMT) for High Reliability
and Repeatability
- Hot Swappable Cards
- Laser Based Back-Biased Photo Detection Circuitry
for Stable Optical Output Over Full Temperature
Range (Singlemode)
- ST™, FC Optical Connector
- 7MHz Video Bandwidth
- 10Hz to 20 KHz Audio Bandwidth
- DC to 300 Kb/s Data Rate
- Meets EIARS-170, RS-343A
- Frequency Modulated (FM) Transmission
- SpectraSmart™ Compatible
- Meets NEMA TS1 /TS2 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
- BNC Video Connector
- DB Style Connector for Data and/or Audio
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CONFIGURATIONS
The LM170 is available as rack mount cards that
can be installed in all of Lascomm's card chassis
and 19" racking frames. The LM170 can be
converted to module by installing it in the SR-500
card chassis. This system can be configured in
either star (module to rack) ortrunking (rackto
rack) configurations. This product requires no
user adjustments and features superior quality
and performance.
APPLICATIONS
- Security and Surveillance
- Video Teleconferencing
- Distance Learning
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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 7 MHz @ -3 dB
<2% typical
<1.5° typical
67 dB weighted*
>30 dB
<0.5% max.
70 MHz |
* Measured @ 1Km (multimode),
@ 10Km (singlemode) |
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Audio |
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I/O Impedance......................................
...........................................................
I/O Level..............................................
Frequency Response...............................
THD......................................................
SNR...................................................... |
600 Ohm, 10 kOhm, 47
kOhm
Balanced/Unbalanced
-6 to +6 dBm
10 Hz to 20 KHz
<1%, 1 KHz @ max modulation
>60 dB (weighted)* |
* Measured @ 1Km (multimode),
@ 10Km (singlemode) |
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Data |
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Formats................................................
...........................................................
...........................................................
...........................................................
Rate.....................................................
Bit Error Rate.........................................
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RS-232D, RS-422A, GenLock,
Manchester, Biphase, 4-20
mA
Current Loop, TTL,
Contact Closure
DC to 300 Kb/s
10-9* |
* Measured @ 1Km (multimode),
@ 10Km (singlemode) |
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Connectors |
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Video...................................................
Audio..................................................
Data....................................................
Optical.................................................
Power..................................................
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75 Ohm BNC (Gold Center
Pin)
DE-15 Female
DE-15 Female
ST™, FC
2 Pin Terminal Block |
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Power**
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Card...................................................
Module................................................
Adapter for SR-500/S............................ |
3
W
120mA@24VAC
Model WP-24 |
** Due to variations of drivers
and diagnostic options power shown
at maximum measurements |
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Indicators (LEDs)
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Green..................................................
Red..................................................... |
Video,
Audio, Data Activity
Power On |
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Physical
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Dimensions:
Module (w/SR-500)................................
..........................................................
Card....................................................
..........................................................
Weight:
Module (w/SR-500)................................
Card...................................................
Number of Rack Slots............................
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181 mm (7.15") L,
24mm (.95") W
132 mm (5.20") H
160 mm (6.3") L,
20mm (0.8") W
100mm (4") H
900 g (32 oz.)
450 g (16 oz.)
One
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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...................................................
.......................................................... |
>190,000
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 |
-34 |
21** |
850 |
ST |
39 |
| 62.5/125 |
-16 |
-34 |
18** |
1300 |
ST |
39 |
| Singlemode (Laser) |
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| 9/125 |
-7*** |
-36 |
29 |
1310 |
ST,FC |
41 |
| 9/125 |
-10*** |
-36 |
26 |
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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