Comcast 1310nm TX, Manual

Page 1: ...1310nm TX www comcast sa com 1310nm Transmitter ...

Page 2: ...tical 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 Connect...

Page 3: ...t 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 ...

Page 4: ...pectral 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 ...

Page 5: ...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 ...

Page 6: ...tions 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...

Page 7: ...1310nm TX www comcast sa com 4 2 Technique Parameters Table ...

Page 8: ...1310nm TX www comcast sa com 4 3 Optical link carrier to noise ratio degradation table ...

Page 9: ...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...

Page 10: ...232 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 ey...

Page 11: ...duct s Logo and model 2 Turn the key to the on position shows the turn on delay Delay countdown 3 After entering the system RF input signal level and optical output power at present 4 Press Enter key into the menu index 1 Parameter menu 2 Set parameters 3 Alarm menu 5 Sub menu of parameters Press Enter key into the menu ...

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Page 14: ...1310nm TX www comcast sa com 6 Setting menu Press Enter key into the menu ...

Page 15: ...act local agency or our company in time 6 2 Instruments and tools 1 An optical power meter 2 A digital multimeter 3 A standard optical fiber test jumper FC APC or SC APC 4 Some absolute alcohol and medical cotton wool 6 3 Installation steps 1 Before installing the equipment please read the User s manual carefully and install the equipment according to the User s manual Note For the man made damage...

Page 16: ...en press the menu button on the front panel to check the working parameters 5 Connect the optical power meter to the optical signal output end by the standard optical fiber test jumper then measure the optical output power Affirm the measured optical output power and the displayed power are the same and have reached the nominal value Affirm the optical power meter is on 1310nm wavelength test posi...

Page 17: ...e front panel display screen and laser status indicator are both normal but the actual measured optical output power is low 1 The poor quality of the test jumper 2 The active fiber connector or adapter may be contaminated 3 The ceramic tube in the adapter may have been broken 1 Replace with good quality test jumper 2 Clean the contaminated active fiber connector or adapter Specific operation metho...

Page 18: ...of the optical contact point has obvious noises 1 The received optical power of the optical contact point is not high enough results in decrease of C N 2 The RF signal level input of the optical transmitter is too low make modulation degree of the laser is not enough 3 The C N index of system link signal is too low 1 Recover received optical power of the optical contact point by cleaning the activ...

Page 19: ...e RF connector shielding effect is not good 3 Close the equipment enclosure tightly to ensure the shielding effect if possible add shielding cover to the optical contact point and reliable grounding After initial startup at optical contact points the image of several channels have obvious noises The C N indexes of these channels are too low Check the C N of these channels signal and make appropria...

Page 20: ...tor types do not match maybe the APC type connect to PC type make the optical signal cannot normal transmission The active fiber connector or adapter may be contaminated seriously or the adapter has been broken 1 1 Check the fiber connector type adopt the APC type fiber connector to ensure the normal transmission of optical signal 2 Clean the contaminated active fiber connector or adapter Specific...

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Page 22: ...bent alcohol cotton If use the medical absorbent alcohol cotton still need to wait 1 2 minutes after wash let the connector surface dry in the air 3 Cleaned optical connector should be connected to optical power meter to measure optical output power to affirm whether it has been cleaned up 4 When the cleaned optical connector screwed back to adapter should notice to make force appropriate to avoid...

Page 23: ...gy to install the active optical connector or the ceramic tape in the adaptor will lead to break Once the ceramic tape is broken the optical output power will decrease rapidly And turn the active optical fiber connector slightly the optical output power changes obviously c Please operate the optical fiber under the condition of shut off the pump laser Or the high output power will lead to burn the...