Comcast 1310nm TX User manual
1310nm TX
www.comcast-sa.com
1310nm Transmitter
1310nm TX
www.comcast-sa.com
Contenido
1. Product Summary...........................................................................................................................4
2. Performance characteristics.......................................................................................................4
3. Block Diagram ................................................................................................................................6
4. Technology Parameters..................................................................................................................6
4.1 Link test conditions ..................................................................................................................6
4.2 Technique Parameters Table....................................................................................................7
.......................................................................................................................................................7
4.3 Optical link carrier to noise ratio degradation table.................................................................8
5. External Function Description ........................................................................................................9
5.1 Front Panel Description............................................................................................................9
5.2 Rear Panel Description ...........................................................................................................10
5.3 Displayed Parameter description ...........................................................................................11
6. Installation debugging..................................................................................................................15
6.1 Unpack and Check ..................................................................................................................15
6.2 Instruments and tools ............................................................................................................15
6.3 Installation steps ....................................................................................................................15
7. Common Failure Analysis and Troubleshooting ...........................................................................17
The Clean and Maintenance Method of Optical Fiber Connector....................................................22
1310nm TX
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This manual applies to 1310nm AM direct modulated optical transmitter with
SNMP network management interface. It mainly describes the performance
characteristics, technical parameters, installation and debugging, common
troubleshooting, and other related content of the product. In order to ensure
that the equipment can be successfully installed and safely operated, please
read this manual carefully before installing and debugging the equipment. And
the installation and debugging should be strictly according to the specified
steps on the manual to avoid unnecessary damage to equipment or accident
harm to the operator. Any questions, please contact with us in time. Special
Tips:
■Optical transmitter is professional equipment, and its installation and
debugging must be operated by special technician. Read this manual carefully
before operating to avoid damage to equipment caused by fault operation or
accident harm to the operator.
■While the optical transmitter is working, there is an invisible laser beam from
the optical output adapter on the front panel. Avoiding permanent harm to
the body and eye, the optical output should not aim at the human body and
human should not look directly at the optical output with the naked eye!
■Please make sure that the ground terminal of the case and power outlet has
been reliably grounding before turning on the power (Grounding resistance
should be less than 4Ω) to prevent the static damage the pump laser device
and harm to human because of case charged.
■To ensure the equipment can work stable over a long time in voltage
unsteady or poor voltage wave region, it´s recommend to the customer that
he equips special AC regulated power supply, or even AC uninterrupted power
supply (UPS) system for conditional regions. In the region with large
temperature variation environment (The equipment's ideal work environment
temperature is 25°C) or bad room environment it´s recommend to the
customer that he equips special air-condition system to improve the work
environment.
1310nm TX
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1. Product Summary
1310nm AM direct modulated optical transmitter is the most important
equipment to construct the CATV HFC network. It mainly used for the long
distance optical fiber transmission of TV image signal, digital television signal,
telephone voice signal and data (or compressed data) signal. This product does
use the high-performance DFB laser as the optical source. The RF drive part
adopts RF power digital automatic processing technology and advanced RF
pre-distortion circuit, and built-in microcomputer automatic monitoring
system, to ensure the excellent performance indicators.
2. Performance characteristics
Adopt high-performance coaxial/butterfly DFB laser, narrow spectral lines,
good linearity and high output power.
■The RF drive part adopts the RF power digital automatic processing
technology. Automatic processing the drive level power according to the RF
input signal level and the number of channels (15-84 channels), make the CSO,
CTB and C/N index always at the optimal value to ensure the overall
performance.
■Advanced multi-frequency RF pre-distortion technology, combined with the
GaAs device, effectively improve the CATV system most important CTB and
CSO index, C/N index also gets the maximum upgrade.
■Adopt advanced 32 bit processor; coordinate with perfect automatic
monitoring system circuit. It can timely and accurately monitor working status
of the laser to ensure a stable optical output power and effectively extend the
working life of the laser.
■Built-in blue screen 160×32 dot matrix LCD monitor on the front panel,
accurately showing all working status parameters.
1310nm TX
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■19″1U standard rack mount, equipped standard IEEE802.3 10Base-T
Ethernet interface and RS232 interface, can expediently realize network
management monitoring.
■Fully support <GB/T 20030-2005 HFC Network device management system
specification>.
1310nm TX
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3. Block Diagram
4. Technology Parameters
4.1 Link test conditions
Special instructions: The performance parameters of this manual according to
the measuring method of GY/T 143-2000 <Specifications and methods of
measurement on AM optical transmitter and receiver used in CATV systems>,
and tested under the specified test conditions.
Test condition: With standard optical fiber and standard optical receiver
composed the test link. Set 84 PAL-D analog TV channel signal at 750MHz
frequency range under the specified link loss. When the optical input power of
optical receiver is -1dBm, measure the C/CTB, C/CSO and C/N
1310nm TX
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4.2 Technique Parameters Table
1310nm TX
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4.3 Optical link carrier to noise ratio degradation table
1310nm TX
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5. External Function Description
5.1 Front Panel Description
1) Power indicator: The light is on while the switching power supply inside is
working.
2) Device running indicator: This indicator will flash after the device start
running.
3) Laser working status indicator: Red light means the laser is not working, but
the machine parameters are normal; flashing red light means the machine has
broken down, related fault reason see the alarm menu of the display menu;
green light means the laser is working normal.
4) RF status indicator: Flashing red light means the RF input signal is warned;
green light means RF input signal is normal.
5) 160×32 dot-matrix LCD screen: used to display all the parameters of the
machine.
6) Display the exit or cancel key of the setup menu.
7) Display the up or increase key of the setup menu.
8) Display the down or decrease key of the setup menu.
9) Display the enter key of the setup menu.
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10) Laser switching key: used to control the working status of laser. “ON”
means the laser is open and “OFF” means the laser is closed. Ensure the key is
on “OFF” position before power on. After passing self-test, rotate the key to
“ON” position according to the displayed message.
11) RF input signal test port: -20dB test port of the rear panel RF input port.
5.2 Rear Panel Description
1. RF signal input.
2. RS232 interface (Console): Used for configuring the network
management parameters.
3. LAN interface: correspond with IEEE802.3 10Base-T, used for network
management.
4. Optical signal output: This interface is the optical signal output port of
the device. The connector type is FC/APC. There is an invisible laser
beam from this port while working normal. So the port should not be
aligned to human body or naked eye to avoid accidental injury.
5. Power input 1(Reserved port, configured dual power or not is decided
by the user).
6. Power input 2.
7. Ground stud of the chassis: used for the connection of the device and
ground wire.
8. Fan outlet.
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