Space Television OTX-CATV-2002 User manual

1310nm Optical Transmitter
OTX-CATV-20
User Manual
Imported and distributed by Space Television www.spacetv.co.za
I. Features
The transmitting modules of this machine adopt the imported DFB
laser.
The internal RF driving amplifier and controlling circuit of this
machine can ensure the best C/N. The perfect and stable circuit of optic
power output and controlling circuit of thermoelectric refrigeration device
of laser module assure the user the best quality and stable working for a
long time.
The internal micro-processor software has many functions such as laser
monitoring, number display, trouble alarm and on-line management. Once
the working parameter of the laser is out of the fixed range, there will be a
red light glistening to alarm.
The RS-232 standard connector makes it is possible to manage on line
and monitor in another place.
The machine adopts 19”standard shelf and it can work with the voltage
from 110V to 254V.
II. Display Board Operation Guide：
Press the button “Status” in the board, the working parameter of
this machine can be seen in turn as follows:

Imported and distributed by Space Television www.spacetv.co.za
1.Model:
OTX-CATV-20(02,04,06,08,10,12,14,16,18,20,22,24,26,28,30,32,34,
36)
2.Output Power: display the output power of this machine（mW）.
3.Laser Temp: the laser works between 20℃and 30℃.If the
temperature is out of this range, the red light will glisten to warm.
4.Bias Current: The bias current of the laser is the main working
parameter of the laser. Only when the parameter is above 30mA, RF
driving circuit can begin to work. The red light will shine to warn when the
RF driving level comes out of the fixed value.
5.REFRG Current：showing the working current of heating or
cooling which can make sure the standard temperature is 25℃.
6.+ 5V test（Reads）：showing internal actual Voltage of ±5V.
7.- 5V test（Reads）：showing internal actual-5V.
8.+24V test（Reads）：showing internal actual voltage of+24V.
III. Operating Guide：
1Please examine this machine, shelf and the power to see if the
power supply is good.
2This machine adopts the switch power with high quality and high
stability which makes it is suitable to work in voltage from 110V
to 254 V.
Imported and distributed by Space Television www.spacetv.co.za
3Please make sure the connector is clean before installation. Please
clean the fiber connector with pure alcohol before connecting the
fiber.
4After connecting the power, please turn on the power in the back
of the board. The screen will show the basic information of this
machine. After several seconds, the laser power will turn on
automatically. If the machine is all right, the condition guide light
(Laser) will turn from red to green. And the screen will show you
the working condition of this machine at present.
5Press the button “STATUS”, then you can see the parameters of
this machine in turn.
6. If all the above working condition is all right, then examine
whether the RF input level can satisfy the request in the test report.
If it is all right, please connect the RF input to the transmitter.
IV. Notice
1. Before installation or operation of unit, please carefully go through
this manual.
2. OTX-CATV-20 Series Transmitters should be serviced only by
qualified personnel.
3. Before proceeding with installation and/or operation of transmitter,
please assure that transmitter is well earthed.
4. OTX-CATV-20 Series transmitters are Class III laser products. Use
of controls, adjustments, and procedures other than those specified

Imported and distributed by Space Television www.spacetv.co.za
herein may result in hazardous laser radiation exposure.
V. Diagram
VI. Main Technical Parameters
Model
OTX-CATV-20 2 4 6 8 10 12 14 16 18 20 24 26 30 32 36
Optic Power
(mW) ≥2 ≥4≥6≥8≥10 ≥12 ≥14 ≥16 ≥18 ≥20 ≥24 ≥26 ≥30 ≥32 ≥36
Optic Power
(dBm) 3 6 7.8 9 10 10.8 11.5 12 12.3 12.8 13.8 14.1 14.8 15.0 15.6
Optic
Wavelength
(nm）
1290～1310
Fiber
Connector FC/APC、SC/APC、SC/UPC (Optional Customer)
Working
Bandwidth
(MHz)
45～860
Imported and distributed by Space Television www.spacetv.co.za
Channels 59
CNR (dB）51
CTB (dBc）≤-65
CSO (dBc）≤-60
RF Input Level
(dBμV)
Not with
pre-distortion 78±5
With
pre-distortion 83±5
Band
Unflatness ≤0.75
Power
Consumption
(W)
≤30
Power Voltage
(V) 220V(110～254)
Working Tem.
(℃) 0～45
Size 19"×15"×1.75"
VII. Warranty Term
OTX-CATV-20 Series optical transmitters are covered by ONE
YEAR LIMITED WARRANTY, which starts from the initial date of your
purchase. We provide its customer whole-life technical supports. If
warranty is expired, repair service only charges parts (if required). In the
event that a unit must be returned for service, before returning the unit,
please be advised that:
1. Warranty mark pasted on the housing of unit must be in good
conditions.
2. A clear and readable material describes model number, serial
number and troubles should be offered.
3. Please pack the unit in its original container. If the original
container is no longer available, please pack the unit in at least 3
inches of shock absorbing material.
4. Returned unit(s) must be prepaid and insured. COD and freight
collect can not be acceptable.

Imported and distributed by Space Television www.spacetv.co.za
NOTE: we do not assume responsibility for damage caused by
improper packing of returned unit(s).
The following situation is not covered by warranty:
1. The unit fails to perform because of operators’ faults.
2. Warranty mark is modified, damaged and/or removed.
3. Damage caused by Force Majeure.
4. The unit has been unauthorized alteration and/or repaired.
5. Other troubles caused by operators’ faults.
Conversion of Optical Power
mW 1 2 3 4 5 6 7 8 9 10 11 12
dBm 0.0 3.0 4.8 6.0 7.0 7.8 8.5 9.0 9.5 10.0 10.4 10.8
mW 17 18 19 20 21 22 25 32 40 50 63 80
dBm 12.3 12.5 12.8 13.0 13.2 13.4 14 15 16 17 18 19
VIII. User login of Web and SNMP
Web Login--- User Name: root Password: 123456
SNMP Login--- User Name: admin No Password
mW 13 14 15 16
dBm 11.1 11.5 11.8 12.0
mW 100 125 160 200
dBm 20 21 22 23