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 ber 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 qualied 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 lled 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 ames.
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 ow 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 classication and requirements as CLASS 1M laser product.
When operating the equipment note the following:
Most ber 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 ber 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 ber 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 ber to the output of the device.
Never leave equipment with radiating bare bers accessible - always cap the connectors..
Cleaning of optical connectors
The ber 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 ber connector may be contaminated by dust or dir. Even tiny particles of dust will affect the
transmission quality. Dusty ber optic connector will contaminate other connected optic parts. If optical reception power and
output level of the receiver decrease, active ber connection should be cleaned and maintained.
Always clean all the ber 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: sales@terraelectronics.com, 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 0o ÷ + 50o 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 E N60065 and
RoHS norm EN50581.
TERRA conrms, 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 conrms, that this product is in accordance with safety standard AS/NZS 60065 and EMC standards of Australia.
Installation instructions
Read the safety instruction rst.
Connect the 75 Ω load to the unused F sockets.
MOUNTING
The module or mounting bracket must be xed with steel screws Ø 3.5-4 mm. The screws are not included
in a package.
Mounting on a wall by screws Mounting on a bracket (supplied)
Perpendicular to the wall Parallel to the wall
Figure 2. Mounting of the transmitter
1 - ◄ - RF input, DC output +12 V switchable (F socket)
2 - ► - RF output (input signal loop-through) (F socket)
3 - ADDR. - indicator of the transmitter adressed
4 - ST. - LED indicator of the transmitter status
5 - LED display
6 - SELECT - control panel “select” button
7 - ▼ - control panel “down” button
8 - ▲ - control panel “up” button
9 - data bus connector (under the cover)
10 - power distribution bus connector (under the cover)
11 - +12 V powering input (screw terminal)
12 - optical output (SC/APC socket)
13 - RF test point (F socket)
Figure 1. External view of the transmitter
External view
Mounting on a DIN rail
Figure 3. Mounting to DIN rail
Figure 4. Mounting from DIN rail
Figure 5. Mounting or removing to/from
DIN rail of plastic spacers (supplied).
Connection of cables
Figure 6 a. Powering of transmitter Figure 6 b. Powering of transmitter
via screw terminal block via power distribution bus
OPERATING
Settings
Select parameter by pressing button SELECT.
Enter necessary parameter values by pressing ▲ and ▼ buttons:
[A1] RF attenuator: ▼ to decrease or ▲ to increase attenuator values (0…15 dB, step 1 dB)
[AL] AGC gain: ▼ OF - AGC is switched off;
▲ ON AGC is switched on.
Is used to set automatic RF level control for constant load to the laser:
The operating AGC level is determined by user at the moment on pressing ▲ button. After that, RF level instability is
compensated automatically by the internal attenuator. If attenuator can’t to compensate RF level, error diagnostic message
“E3” (No AGC) occurs:
[UE] to switch DC voltage on RF input socket: ▼ OF: 0V; ▲ ON: 12V
[rF] ▲ Indicates input RF signal average load power. It depends on input signals values and number of channels.
[L1] ▲ Indicates current of Laser 1;
[L2] ▲ Indicates current of Laser 2;
[U1] ▲ Indicates external voltage DC on RF input socket;
[U2] ▲ Indicates supply voltage 12V;
[U3] ▲ Indicates internal 5V supply voltage;
[tE] ▲ Indicates internal temperature of device;
Diagnostic warnings and errors:
E- no warnings or errors (green color of status LED).
UP410S - power supply
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