Optical transmitters mo418, mo428
Product description
The optical transmitters mo418, mo428 (in text - transmitter) are high performance optical transmitters 1310 nm or 1550
nm wavelength for forward path transmission of broadcast services. Transmitter mo428 has dual optical output to increase
the number of users. Both types of transmitters alow to use one optical fiber for CATV and SAT IF signal transmission.
The transmitter has automatic RF level and automatic laser power control for constant optical output.
The transmitter includes LED display and three buttons to input settings.
The product is intended for indoor usage only.
Safety instructions
The transmitter must be installed in accordance with IEC 60728-11 and national safety standards.
The transmitter is powered from a 12 V power supply unit. This voltage is not dangerous to life.
The power supply unit must have a short circuit protection.
Any repairs must be made by a qualified personnel.
Do not connect the 12 V power supply unit into the mains socket until all cables of transmitter have been correctly connected.
The mains socket must be easily accessible.
Disconnect the transmitter power supply by removing the power supply cable from the mains socket.
Do not expose this transmitter to moisture or water splashes, make sure no liquid filled objects, e.g. vases, are placed
near or on the unit.
Avoid placing the transmitter near heat sources, e.g. central heating components or in areas of high humidity.
Keep the transmitter away from naked flames.
If the transmitter has been stored in cold conditions for a long time, bringing it into a warm environment may cause
condensation. In such cases let it warm up for at least 2 hours before plugging it into the mains.
To ensure proper ventilation do not block the ventilation openings.
IMPORTANT
: Mounting of the transmitter is allowed vertical only and the free flow of air through the unit must be not restricted.
If the transmitter is installed in a 19” rack system additional forced air cooling fans may be required (see Table 1 - Operating
temperature range). Always leave 10 cm of free space from the top, front and bottom of the unit to allow heat dissipation.
Safety of laser product
Optical Transmitter module contains laser diode sources operating at 1310/1550 nm. These devices are rated under
IEC60825-1:2007 “Safety of Laser Products”, Part 1: Equipment classification and requirements as CLASS 1M laser product.
When operating the equipment note the following:
Most fiber optic laser wavelengths (1310 nm and 1550 nm) are totally invisible to the eye and will cause permanent eye damage.
Never look into the end of a fiber on a powered device through a magnifying device (microscope, eye loupe, magnifying
glass, etc.). Before using such devices always double check that power is disconnected or, if possible, completely disconnect
the unit from any power source.
To verify the light output always use an instrument, such as an optical power meter.
Operate only with the proper optical fiber installed in the transmitter optical connector.
Whenever the optical connector is empty the laser transmitter should be turned off.
Before applying power always connect a fiber to the output of the device.
Never leave equipment with radiating bare fibers accessible - always cap the connectors..
Cleaning of optical connectors
The fiber ends may be damaged if contaminated connectors are inserted. The warranty does not cover some types of
damage, made by the customer. The standard optical connector for optical transmitter is SC/APC.
During the operation each fiber connector may be contaminated by dust or dir. Even tiny particles of dust will affect the
transmission quality. Dusty fiber optic connector will contaminate other connected optic parts. If optical reception power and
output level of the receiver decrease, active fiber connection should be cleaned and maintained.
Always clean all the fiber optic connectors before setting.
Reel cleaners or prepackaged lint free wipes or swabs with alcohol are the most convenient means of cleaning optical connectors.
Fiber connectors should never be left uncovered.
Do not exceed the minimum bending radius when connecting cable to the system.
Structure diagram
Draugystes str. 22, LT-51256 Kaunas, Lithuania, tel.: +370 37
-
31 34 44, fax: +370 37
- 31 35 55
E-mail: [email protected], http://www.terraelectronics.com
Modular fiber optics system
Type
mo418* mo428*
Number of optical outputs
1 2
Optical power*
1x6 dBm
2x6 dBm
Optical wave lenght
1310 ± 10 nm
1550 ± 3 nm
1310 ± 10 nm
1550 ± 3 nm
Laser type
DFB
RF frequency range
47-2400 MHz
RF input level
70-85 dBµV
RF input impedance
75
Ω
Gain adjustment
0...-15 dB by 1 dB step
AGC range
± 5 dB
RF input loop through
frequency range
47-2400 MHz
loss
< 1 dB
flatness
± 1 dB
Return loss
≥
18 dB at 40 MHz -1.5 dB/oct (47-950 MHz);
≥
10 dB up to 1750 MHz;
≥
7 dB up to 2400 MHz
Relative intensity noise RIN
< -150 dB/Hz
Terr.TV
intermodulation distortion CSO**
> 60 dB
> 55 dB
> 60 dB
> 55 dB
intermodulation distortion CTB**
> 62 dB
> 60 dB
> 62 dB
> 60 dB
carrier/noise ratio C/N**
> 51 dB
> 50 dB
> 51 dB
> 50 dB
SAT IF intermodulation distortions IMD3***
> 35 dB
Test point****
8.0 ± 1.0 dB (47-1750 MHz); 6.5 ± 1.5 dB (1750-2400 MHz)
Optical connector
SC/APC
Supply voltage
12 ± 1 V
DC feeding for external
12 V
0.4 A max.
Current consumption*****
0.35 A
0.4 A
Operating temperature range
0
o
÷
+ 50
o
C
Dimensions/Weight (packed)
198x107.5x36 mm/ 0.9 kg
** measurement conditions according EN 60728-3, 42 CENELEC:
optical modulation index (OMI) 4.0%;
The sticker “RF test level” with the exact RF level
dBµV/
chan for OMI=4.0%
is placed on the side of the cover.
*** two tone test metod according EN 60728-3 OMI 20 %
**** relative to RF IN port with 0 dB attenuator and off AGC
***** without external DC feeding
“Status” LED goes to red color if any warning or error occurred:
E1
5V out of range
E6
Low external voltage
E2
12V out of range
E7
Overheat
E3
No AGC
E8
Laser LD1 ageing
E4
Low RF
E9
Laser LD2 ageing
E5
High RF
NOTE
!
1. DC on “RF input” socket (12 V) can be dangerous for some devices.
2. If no action is taken for 5 minute, sleep mode "E -" is activated. To leave sleep mode press any button.
3. If “RF Out ” and/or “RF test” connectors is not used, connect the 75 Ω load.
4. The last selected parameters will remain in memory if the power is interrupted.
Setting of transmitter address
Transmitter address is used for software upgrades. Ensure, that all addresses would be different in the same data bus.
Transmitter address can be changed in the address setting mode.
To enter the address setting mode press and hold “SELECT” and ▲ buttons simultaneously for 1 second.
Select [9A] and set group address value (1….4) with ▼ and ▲ buttons.
Select [dA] and set device address value (1….16) with ▼ and ▲ buttons.
To exit mode press and hold “SELECT” and ▼ buttons simultaneously for 1 second again.
Factory settings: 9A=1; dA=8
Default settings
The transmitter is supplied with the following default settings:
A1: Attenuator
0
AL: Automatic Gain Control:
OF
UE: External 12V
OF
Table 1. Technical characteristics
*
Type Laser
mo418 4D31
6 dBm DFB 1310 nm
mo418 4D55
6 dBm DFB 1550 nm
mo428 4D31
2x6 dBm DFB 1310 nm
mo428 4D55
2x6 dBm DFB 1550 nm
Vers. 1.02
INVISIBLE LASER RADIATION DO NOT VIEW DIRECTLY WITH OPTICAL INSTRUMENTS. Wave length 1270-1610 nm, IEC60825-1:2007
This product complies with the relevant clauses of the European Directive 2002/96/EC. The unit must be recycled or discarded
according to applicable local and national regulations.
Equipment intended for indoor usage only.
TERRA confirms, that this product is in accordance to following norms of EU: EMC norm EN50083-2, safety norm EN60065 and
RoHS norm EN50581.
TERRA confirms, that this product is in accordance with Custom Union Technical Regulations: “Electromagnetic compatibility of technical
equipment“ CU TR 020/2011, “On safety of low-voltage equipment“ CU TR 004/2011.
TERRA confirms, that this product is in accordance with safety standard AS/NZS 60065 and EMC standards of Australia.
