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LT1550-E

www.comcast-sa.com

1. Overview

1.1 About This Manual

This instruction manual is a complete guide to install and operate the (1RU)

LT1550-E series 1550nm external modulated optical transmitter. Please read
the entire manual before beginning installation.

This manual applies to LT1550-E series external modulated optical

transmitter.

• Chapter 1 gives general information about the LT1550

-E series 1550nm

external modulated optical transmitter.

• Chapter 2 describes the

complete technical specifications of LT1550-E.

• Chapter 3 describes the front/rear

panel interfaces and menu system.

• Chapter 4 tells you how to install LT1550

-E series external modulated optical

transmitter.

• Chapter 5 tells you the communication sett

ing of LT1550-E.

• Chapter 6 describes maintenance and what to do in the event of problems.

1.2 Product Description

LT1550-E series optical transmitter is a 1550nm DFB laser external
modulated transmitter. It is specially developed for the CATV signal that
satisfies HFC network, and the long-distance transmission of cable phone and
cable data.

Содержание LT1550-E

Страница 1: ...LT1550 E www comcast sa com External modulate optical transmitter ...

Страница 2: ...ical Parameters 9 2 2 Model Test Indicators 10 2 3 Test Condition 11 2 4 Technical Data Sheet 11 3 Panel Interface and Menu System Description 13 3 1 Front Panel 13 3 1 1 Indicator Description 14 3 2 Rear Panel 15 3 3 Power Module 15 3 3 1 220V Power Module 15 3 3 2 48V Power Module 16 3 4 Menu Operation 16 3 4 1 Main Menu 16 3 4 2 Display Menu 17 3 4 3 Set Menu 19 3 4 4 Alarm Menu 21 3 4 5 AGC Mo...

Страница 3: ...g the Optical Fiber Cables 26 4 3 4 Connecting the Ethernet Cable 28 4 3 5 Connecting Power 28 5 Communication Setup 30 5 1 RS232 Communication Interface Description 30 5 2 Set up the Hyper Terminal 30 5 3 Operating Parameters Configuration 34 5 4 Remote Monitoring SNMP 39 5 5 WEB Network Management 40 6 Maintenance and Troubleshooting 44 6 1 Cleaning Fiber Optic Connectors 44 6 1 1 Cleaning Patch...

Страница 4: ...LT1550 E www comcast sa com ...

Страница 5: ...ptical transmitter Chapter 2 describes the complete technical specifications of LT1550 E Chapter 3 describes the front rear panel interfaces and menu system Chapter 4 tells you how to install LT1550 E series external modulated optical transmitter Chapter 5 tells you the communication setting of LT1550 E Chapter 6 describes maintenance and what to do in the event of problems 1 2 Product Description...

Страница 6: ...GC control makes the optical modulator maintain a suitable input level Use the detected RF root meansquare RMS total power to calculate the optical modulation index OMI In general we recommend using the AGC function and special users can use the MGC function to adjust the CNR CSO CTB performance indexes The core of transmitter is the optical modulator The 1550nm signal input the optical modulator ...

Страница 7: ...ent researched and developed by ourselves The threshold value can be set up to 19dBm The optical modulator has a two way optical signal output Parts of that signal are routed to an InGaAs photodiode This detection of the optical signal has two functions 1 Detect whether the laser is normal working Once the output optical power is 2dB lower than standard power alarm will be set off 2 Detect CSO dis...

Страница 8: ...LT1550 E www comcast sa com 1 3 Product Applications High performance long distance transmission High power distribution network Redundancy loop architecture FTTx network RFOG application DWDM network ...

Страница 9: ...t Value Optical Wavelength nm 1545 1560 or specified by the user Side mode Suppression ratio dB 30 Relative Intensity Noise dB Hz 160 Wavelength Adjustment Range GHz 50GHz Optical Power dBm 2 7 2 8 2 9 2 10 SBS Threshold Value dBm 13 19 Continuously adjustable Laser Linewidth MHz 0 3 ...

Страница 10: ... PAL D84 PAL D Channel Number TV FM QAM64 42 0 0 59 0 0 84 0 0 30 0 48 Bandwidth Noise 5 5 5 5 CNR Tx Rx 55 5 54 0 52 5 54 5 CNR Link 1 55 0 53 5 52 0 54 0 CNR Link 2 53 0 52 5 50 5 52 5 CNR Link 3 50 5 50 5 49 0 51 0 CSO Tx Rx and Link 1 64 65 65 70 CSO Link 2 63 65 65 70 CSO Link 3 62 64 63 65 CTB 65 65 65 68 ...

Страница 11: ...Bm 65km no no 0dBm 16 Link 3 13dBm 50km 13dBm 50km 0dBm 13 5 Rx with 8 pA ÖHz input noise current density EDFA with 5dB noise figure RF input level at 80 dBμV TV channel 2 4 Technical Data Sheet Item Unit Technical Parameters RF range MHz 47 1003 RF flatness dB 0 75 RF return loss dB 16 RF input impedance Ω 75 RF input connector type F type Rated input level dBµV 80 Input level range dBµV 78 96 AG...

Страница 12: ...nge dB 3 3 MGC adjustable range dB 0 15 Optical connector SC APC FC APC Operating temperature C 5 45 Storage temperature C 30 70 Power Source Specification V 90 265VAC 36 72VDC Consumption W 60 Dimension mm 483 L 455 W 44 H Total Weight kg 5 5 ...

Страница 13: ... AGC indicator 3 RF modulation degree indicator 4 Laser indicator 5 LCD 6 ESC key 7 UP key 8 DOWN key 9 Enter key 1 0 20dB RF input test port 1 1 RF input port or on the rear panel optional 12 Optical output interface A or on the rear panel optional 1 3 Optical output interface B or on the rear panel optional ...

Страница 14: ...upplies LED green AGC indicator AGC mode LED green MGC mode LED off RF modulation degree indicator Normal LED green Abnormal LED flash red Laser indicator Bias current cooling current and output power are all normal LED green At least one of bias current cooling current and output power is abnormal LED flash red ...

Страница 15: ...port or on the front panel optional 5 RS232 interface 6 LAN interface 7 Optical output interface A or on the front panel optional 8 Optical output interface B or on the front panel optional 3 3 Power Module 3 3 1 220V Power Module 1 Mounting screws 2 220V power outlet 3 Fuse 4 Power switch ...

Страница 16: ...LT1550 E www comcast sa com 3 3 2 48V Power Module 1 Mounting screws 2 Positive terminal block 3 Negative terminal block 3 4 Menu Operation 3 4 1 Main Menu ...

Страница 17: ...E www comcast sa com Displayed parameters Comments Boot display 1 Disp Parameters Menu one Display parameters 2 Set Parameters Menu two Set parameters 3 Alarm Status Menu three Alarm status 3 4 2 Display Menu ...

Страница 18: ...nitor voltage 12V Read 12V monitor voltage Laser Cooling Cooling current LASER Laser status OMI rms Total modulation degree SBS Module Temp SBS module temperature RF Mode RF control mode BOX Temp Overall temperature AGC Adjusted value with AGC mode MCU Temp MCU temperature MGC Adjusted value with MGC mode S N Serial number 5V Read 5V monitor voltage Version Version number 5V Read 5V monitor voltag...

Страница 19: ...LT1550 E www comcast sa com 3 4 3 Set Menu ...

Страница 20: ... mode Set SBS Suppression Set SBS value Range 13 19dBm 0 5dB stepping Set ITU Set optical wavelength Range 50GHz Set Channel Distance Set channel distance 6MHz 7MHz 8MHz Set LASER Set laser status ON OFF Set IP Address Set IP address Set Mask Set subnet mask Set Gateway Set gateway Set Trap1 Address Set trap1 address Set Trap2 Address Set trap2 address Set Buzzer Alarm Set buzzer alarm ON OFF Rest...

Страница 21: ...utPutPower Status HIGH LOW The output optical power is high low 5V Status HIGH LOW The 5V voltage is high low 5V Status HIGH LOW The 5V voltage is high low 12V Status HIGH LOW The 12V voltage is high low 12V Status HIGH LOW The 12V voltage is high low 24V Status HIGH LOW The 24V voltage is high low Laser OFF The laser is off CSO Initialization failed The CSO initialization is failed Power invalid ...

Страница 22: ... optimal gain while the input level is in the working range see the technical data sheet And the specified OMI rms modulation index will be automatic gain control 3 4 6 MGC Mode Special users who need to adjust system CNR CSO CTB performance indexes to satisfy the specified requirements can use this mode The amplification gain attenuation range 0 15dB Not recommend ...

Страница 23: ...ance is very similar to linear relationship 50GHz frequency distance reflects to wavelength is very approximate to 0 4nm width As the same 100GHz frequency distance reflects to wavelength is very approximate to 0 8nm width 3 4 8 SBS Suppression Adjustment SBS value is very important in 1550nm long distance transmission system Stable continuous coherent light source add 6 dBm optical power in the s...

Страница 24: ...pears to be damaged 4 2 Precautions Heed the following precautions when working with the LT1550 E Warning Read the installation instructions before connecting the system to the power source Attention Avant de brancher le système sur la source d alimentation consulter les directives d installation Warnung Vor dem Anschließen des Systems an die Stromquelle die Installationsanweisungen lesen Warning ...

Страница 25: ...LT1550 E www comcast sa com Warnung Mit Wechselstrom betriebenes Modell Der Netzstecker muss jederzeit leicht zugänglich sein ...

Страница 26: ... connector type according to the ordering information then screw on the matched RF cable 4 3 3 Connecting the Optical Fiber Cables LT1550 E has two output optical connectors DANGER The fiber carries invisible laser radiation AVOID DIRECT EXPOSURE TO BEAM Never operate the unit with a broken fiber or with a fiber connector disconnected 1 Verify the matched LT1550 E fiber cable connector type accord...

Страница 27: ...tamination of optical connector can significantly degrade optical link performance This degradation will most likely manifest itself as poor signal to noise SNR performance 4 Note to butt the nick of the connectors and align them accordingly ...

Страница 28: ...transmitter 2 Verify that the green Link LED is illuminated indicating that there is a connection The Link LED is above the Ethernet port on the rear panel 4 3 5 Connecting Power The LT1550 E is available in an AC power model or DC power model After mounting the LT1550 E in a rack follow the power connection procedure below for the model that you are installing The AC powered LT1550 E has two opti...

Страница 29: ...equire input voltage from 36 to 72 VDC The DC input connectors are located on the rear panel Turn on the power source It takes about 60 seconds for all systems to operate When connect one power supply the power indicator is yellow when connect two power supplies the power indicator is green ...

Страница 30: ...ect 5 GND 6 No Connect 7 No Connect 8 No Connect 9 No Connect The serial communication uses the standard NRZ form 1 starts bit 8 data bits 1 stop bit and the baud rate is 38400 5 2 Set up the Hyper Terminal If you have not setup the Hyper Terminal in your Windows system follow the steps Click start menu program accessory communication Hyper Terminal This results in the following screen ...

Страница 31: ...LT1550 E www comcast sa com ...

Страница 32: ...rt to connect with your equipment As follows Press the OK button shows the configuration page of serial port As follows Change the serial port configuration to 38400 baud rate 8 data bits no parity bit 1 stop bit no data flow control press the OK button you have set up the Windows serial port Hyper Terminal ...

Страница 33: ...LT1550 E www comcast sa com You can click file save menu to save this configuration of Hyper Terminal for later using ...

Страница 34: ...er off use the serial port lines to connect the RS232 port with the computer port Open the Windows Hyper Terminal which you have set up Then turn on the power you will see the page as follows Enter the password to enter the configuration interface Enter the password display the following screen ...

Страница 35: ...LT1550 E www comcast sa com You can input your command in this page and then configure the operating parameter of the application program ...

Страница 36: ...ands list of the system as follows You can also use the help command to show help information of other commands such as help ethcfg ethcfg s help information appears as follows List internal commands of the system Configure the Ethernet operating parameters Configure the aim host IP address of the SNMP Trap Configure the SNMP group name List system default parameters or user updated parameters Res...

Страница 37: ...LT1550 E www comcast sa com ...

Страница 38: ...255 255 255 255 don t exist SNMP Trap does not send to these two addresses community This command configures the read only group name and read write group name Group name is the concept of SNMP agreement like the password Use the command community ro to configure the read only and community rw for the read write For example input community rw public public is the read write group name The group na...

Страница 39: ... Adopt RJ45 standard connector the pin definitions as follow 1 TX 2 TX 3 RX 4 No Connect 5 No Connect 6 RX 7 No Connect 8 No Connect A Green indicator flashing means that the LAN port is sending data B Yellow indicator means that the network connection is normal SNMP basic background ...

Страница 40: ...o visit these MIB They are composed of manageable information and identified by the object identifier SNMP Transmitter configuration of network communication When the transmitter initial work the IP address and gateway are in the default state you need to configure them The configuration of initial state can be achieved through the RS 232 interface or the front panel keys Other configurations see ...

Страница 41: ...ub interfaces 1 About1550 interface Mainly described the basic information of the equipment 2 Disp Paraments interface Mainly described the display menu of the equipment 3 Set Paraments interface Change the device parameters in this interface ...

Страница 42: ...he parameters The steps to change the parameters find the item in the Item column select the new parameter values in the New column and click the corresponding Update button to update the parameters The change steps in the Items are the same but finally need to click the Restart Device button to take effect The button is the device reboot button click it the device will auto reboot The is the chan...

Страница 43: ...LT1550 E www comcast sa com ...

Страница 44: ...1550 E optical connector before connecting the optical fiber CAUTION Improper cleaning of an optical connector can do more harm than good Never spray a clean air product onto the surface of an optical connector Spraying air onto an optical connector can cause condensation on the connector surface leaving water spots and trapping dust Failing to wipe a connector on dry lens paper immediately after ...

Страница 45: ... Use a drop of high grade isopropyl alcohol to wet part of the paper 3 Lay the connector on the lens cleaning paper with the tip touching the paper 4 In one continuous motion pull the connector from the wet part of the paper to the dry part ...

Страница 46: ... not plugged in Plug in the left right power cord If that does not correct the problem contact Customer Service Replace the power supply Power indicator is flash yellow 5V Status HIGH LOW 5V Status HIGH LOW 12V Status HIGH LOW 12V Status HIGH LOW 24V Status HIGH LOW Power alarm menu shows one of the contents The laser is off Contact Customer Service RF indicator is flash red RF IN Status LOW HIGH ...

Страница 47: ... laser is off Contact Customer Service Laser TEC HIGH The laser is off Verify that the unit is operating within the proper temperature range 5 45 Verify that nothing is obstructing airflow through the openings in the front and back of the unit Recall factory settings by pressing the key on the front panel see Section 3 If that does not correct the problem contact Customer Service OutPutPower Statu...

Страница 48: ... products described herein at any time and without prior notice We assume no responsibility or liability arising from the use of the products described herein except as expressly agreed to in writing by us The use and purchase of this product does not convey a license under any patent rights copyrights trademark rights or any intellectual property rights of us Nothing hereunder constitutes a repre...

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