User Manual
Contents
1. 5 6 7 8 equaliser 15 elll diplex filter return module receiver 1 receiver 2 transmitter 1 transmitter 2 e Le TP test injection 20 dB 4 outpit 2 output splitter I Le Fig 11 AC8000 plug in placement Optical receiver 1 9 Output 2 Optical receiver 2 backup 10 Output 3 Interstage equaliser 11 Slot for element transponder module Interstage attenuator s 12 Return module Diplex filter s 13 Slot for optical transmitter 1 Output test point s 14 Slot for optical transmitter 2 Test signal injection point s 15 OMI test point for optical transmitter 1 20 db directional coupler 16 OMI test point for optical transmitter 2 Output 1 17 Fuse s Output module see table 2 TELESTE User Manual AC8000 59300024 Rev 006 Broadband Cable Networks 30 3 2007 12 22 Forward path Optical receivers The AC6810 20 is a line of fibre optic receiver modules used in the AC8000 node platform Its performance and the features have been designed for the fibre to the curb and the fibre to the building FTTC FTTB applications Depending on the optical input power there are two kinds of modules available e AC6810 with an optical input power range ranging from 7 dBm to 2 dBm e AC6820 with an optical input power range ranging from 3 dBm to 2 dBm It is possible to order the AC8000 platform with only one optical receiver installed and add a second receiver for backup reasons later I2. TELESTE Broadband Cable Networks User Manual AC8000 59300024 Rev 006 30 3 2007 19 22 4 Choose the interstage attenuators Fig 11 pos 4 for both outputs according to wanted output level The network plan should specify exact signal levels Refer to the table 4 If the node has currently electrical level adjustment modules AC6173 installed skip to step 5 Output level dBUV Interstage attenuator dB 108 JDA900 107 JDA901 106 JDA902 105 JDA903 104 JDA904 Table 4 Interstage attenuator selection guide 5 Install the interstage equaliser Fig 11 pos 3 according to network plan 6 Apply the power 7 Connect the fibre s 8 The optical receiver may need fine tuning at this point To fine tune use the interstage attenuator Fig 11 pos 4 to set the output level equal to your reference If electrical level adjustment modules AC6173 are used adjust the gain control to achieve the desired output level The adjustment range is 107 97 dBuV Before the fine tune allow the unit to reach its normal operating temperature approx 10 min TELESTE User Manual AC8000 59300024 Rev 006 Broadband Cable Networks 30 3 2007 20 22 Return path Optical return transmitters Optional return path operation requires plug in diplex filters Fig 11 pos 5 return path module Fig 11 pos 12 and optical return transmitters Fig 11 pos 13 14 The available diplex filter types are C
3. also a Pilot check box that when selected enables the pilot signal The pilot signal frequency 4 5 MHz or 6 5 MHz can be selected with a DIP switch on the transmitter module s front panel TELESTE User Manual AC8000 59300024 Rev 006 Broadband Cable Networks 30 3 2007 16 22 Node control unit ac6183 Tatleste AC6183 Node control unit Optical 1 Return 0 dB auto Path 6 dB RX 2 Control 50 dB Gain2 Gain 1 2 1 Fig 13 AC6183 front panel The AC6183 node control module provides manual control of gain input redundancy functions and ingress switch The AC6183 front panel contains three 3 pos vertical toggle switches and two screwdriver adjustable potentiometers Optical RX These settings provide manual or automatic switchover between two input channels in case the incoming signal is lost If the Auto mode is selected the unit will look for an optical signal on the inputs to select the active input If the second input becomes active the unit will automatically change to the new input The input selection mode can also be set to manual mode where the user can override the automatic procedure In position 1 the main input is selected as primary input path In position 2 the backup input is selected as primary input path Gain The gain adjustment is based on either AC6173 or AC6174 electrical adjustment board The output level adjustment range with AC6173 is 0 10 dB
4. Rev 006 Broadband Cable Networks 30 3 2007 4 22 Cable connections 8604050 Grounding point Fibre input port Output port 3 Output port 2 Output port 1 Fig 2 Port locations The AC8000 fibre node has four dedicated cable connection points one fibre input and two three RF outputs The amount and function of the actual connectors varies with the chosen configuration All coaxial outputs have a standard PG11 thread and they accept any KDC type adapter or connector A suitable length of the coaxial cable inner conductor exposed for the connectors is approximately 20 mm Fig 3 8604025 Fig 3 Centre conductor length TELESTE User Manual AC8000 59300024 Rev 006 Broadband Cable Networks 30 3 2007 5 22 Fibre connections The node can accept four fibre cables These cables carry forward path and return path optical signals When feeding the optical cable in the node a suitable PG11 threaded feed through adapter type KDO900 is available Remove the outer ring of the cable gland thread the installation fibre filaments with connectors through the outer ring Fig 4 pos 3 through the sealing insert Fig 4 pos 2 and finally through the cable gland Fig 4 pos 1 Mount the cable gland on the housing The fibre filament length inside the fibre organiser is adjusted to sufficient measurement before tightening the outer ring Use the synthetic locking pins supplied to seal up unused holes in the sealing in
5. active and it will automatically follow the active receiver i e the node supports continuous operation of one transmitter with the input selection control Receiver modules The types of the receiver modules as well as the measured optical input levels are displayed in the Receiver modules frame The background colour of the Optical level data field changes to indicate alarms A green background means acceptable values and red is the symbol for an alarm The Active radio button indicates which of the receiver modules is in use The frame also displays the Optical level limits The main input limits are also used to control the automatic input selection All the limits are set by the manufacturer and can be modified with an End User user profile or higher The deadband limits can only be modified by users with a Service level user profile or higher Transmitter modules The types of the transmitter modules as well as the measured laser currents are displayed in the Transmitter modules frame The background colour of the Laser current data field changes to indicate alarms and warnings A green background means legal values yellow is the symbol for a warning The frame also displays the Laser current limits after which the unit starts indicating alarms and warnings All the limits are set by the manufacturer and are displayed as read only information The Transmitter modules frame includes
6. drive level corresponding to 4 OMI channel The pilot generator level corresponds to 4 OMI Available pilot signal frequency 4 5 MHz or 6 5 MHz can be controlled with a DIP switch on the module s front panel Fig 15 Note Transponder will always control pilot ON OFF regardless the DIP switch s state TELESTE Broadband Cable Networks User Manual AC8000 59300024 Rev 006 30 3 2007 21 22 65 OH ON CU OFF AC6861 3dBm 1610 nm 8607020 DIP Switch Setting LEFT RIGHT lt M Switch 1 Pilot Signal Frequency Left Right Selects 6 5 Mhz Selects 4 5 MHz Switch 2 Level of Output Power Selects nominal 1 dBm Selects 0 dBm ACG8 Tx Laser Switch 3 Pilot Signal Status Selects ON Select OFF Fig 15 AC68 Tx DIP switch positions With the DIP switch it is possible to reduce nominal optical power by 1 dB But OMI is also changed However the product specifications are valid only when using the nominal power In O dB position use 2 dB lower drive level TELESTE User Manual AC8000 59300024 Rev 006 Broadband Cable Networks 30 3 2007 22 22 Return path adjustment Inject a signal of known power 20 dB higher compared to return path input level into the test signal injection point Fig 11 pos 6 in the node The level of return signal can
7. organiser module Fitting of the fibres under the retaining tabs is designed to keep the fibres in place without the use of cable ties The fibre organizer is equipped with lids to ensure fibre protection The lids provide easy and fast re entry by using plastic clips 8605016 Fig 9 AC8000 fibre organizer TELESTE User Manual AC8000 59300024 Rev 006 Broadband Cable Networks 30 3 2007 10 22 Carefully wind the fibres around the fibre tray noting the entry points for the installation fibre filaments Fig 10 pos A and the fibre pigtail of the optical re ceiver1 Fig 10 pos C Each fibre should be connected to its corresponding adapter Fig 10 pos D The fibre organiser tray is equipped with slots Fig 10 pos B for fibres to be routed on either side of the fibre tray The under side of the fibre tray is reserved for fibre pigtails of return units and the upper side for fibre pigtails of forward units 8604084 Fig 10 Routing fibres typical configuration Where fibres pass the bending point of the fibre organiser module there must not be any strain on attachments or excessive slack when it is opened or closed Therefore the pigtail of the optical receiver 1 must be routed above all other fibres refer to fig 10 TELESTE User Manual AC8000 59300024 Rev 006 Broadband Cable Networks 30 3 2007 11 22 Connectors and plug in slots 58700174 L 17 Te receiver 2 1 2 3 4
8. signal is lost There are four possible selections When the input selection is set to the Automatic mode the node automatically selects the input channel according the signal conditions If the signal level at the main input is below the low alarm limit or over the high alarm limit the backup input will be selected The main input is selected when the signal level is between limits This fully automatic input selection between the two inputs offers a useful redundancy mode for critical applications When the input selection is set to the Automatic manual restore mode the automatic input selection takes place in the same way as before but user has to reset the switch back to the main input by manually selecting Manual Rx 1 and after that Automatic manual restore again The input selection mode can also be set to manual mode where the user can override the automatic procedures In Manual RX 1 mode the main input is used In Manual RX 2 mode the backup input is used There might be a slight delay between the input selection and the reply of the optical node TELESTE User Manual AC8000 59300024 Rev 006 Broadband Cable Networks 30 3 2007 15 22 Return transmitters When the Return transmitters selection is set to the Both transmitters on mode both transmitters are forced to be active regardless of the input selection In the One transmitter on mode only one transmitter will be
9. with 1 dB feed through loss The output level adjustment range with AC6174 is 0 13 dB with 2 5 dB feed through loss See the Electrical adjustment module chapter for more details Return Path Control Controls the attenuation of the ingress control switches The return path signal can either be cut off i e signal is attenuated more than 50 dB or be attenuated by 6 dB As default factory setting the ingress switch is set to 0 dB position TELESTE User Manual AC8000 59300024 Rev 006 Broadband Cable Networks 30 3 2007 17 22 Electrical adjustment module ALC AC8000 node can also be outfitted with electrical adjustment board AC6173 or AC6174 which enable fine adjustment of the input levels This module is driven either by the transponder unit or manual node control unit An electrical adjustment module is placed in the plug in position for interstage attenuators Fig 11 pos 4 Although the modules are placed in the plug in position for interstage attenuators installation is only possible after the removal of the shielding cover Refer to fig 14 for locations of the electrical adjustment boards The node features an ALC function which ensures that the output level is constant even if the optical input level is varying In order to utilize the ALC function a transponder AC6950 or AC6940 is needed ac6173kp Fig 14 Electrical adjustment module AC6173
10. TELESTE User Manual AC8000 59300024 Rev 006 Broadband Cable Networks 30 3 2007 1 22 ACcess Series User Manual Teleste Corporation AC8000 Fibre Node TELESTE User Manual AC8000 59300024 Rev 006 Broadband Cable Networks 30 3 2007 2 22 Introduction AC8000 is a dual active output node with high performance characteristics The node has been designed to fulfil a variety of needs It is extremely versatile and scalable through a wide range of plug in options The output amplifier stages are based on high performance hybrids what makes the used output level range especially wide AC8000 features two high level distribution outputs The second output can be divided into two outputs with a passive output module Redundant optical input The node can be equipped with two optical receivers if redundancy of the downstream is requested In the event of fibre break the platform provides manual or automatic switchover between alternative fibre paths Return path redundancy or segmentation The upstream channel can also be fully redundant with double transmitter solution If more return path segmentation is requested both optical return transmitters can be fed by separate return signals Redundant or segmented upstream operation is selected with the return module Redundant powering Up to two power supplies can be installed in the node Two field replaceable housing lids preinstalled with power supply units are avail
11. TELESTE User Manual AC8000 59300024 Rev 006 Broadband Cable Networks 30 3 2007 18 22 Forward path adjustments The following are instructions to be used for a normal adjustment procedure This procedure assumes that the output module and diplexers that are specified in the network plan are installed 1 Do not connect fibres or apply power before all the adjustments described below have been made 2 Use an optical power meter to measure the level of the optical input signal s 3 Install an attenuator in the optical receiver to get appropriate RF level Attenuators of the JDA900 series ranging from O dB to 20 dB in 1 dB steps are available The attenuator value depends not only on the optical input level but also on the optical receiver type and the OMI Refer to the table 3 Opt input level Attenuator 4 OMI Attenuator 5 OMI dBm AC6810 AC6820 AC6810 AC6820 2 z JDA910 JDA912 1 5 3 JDA909 JDA911 1 E JDA908 JDA910 0 5 JDA907 JDA909 0 JDA906 JDA908 0 5 JDA905 JDA907 1 JDA904 JDA906 1 5 E JDA905 JDA905 2 JDA910 JDA902 JDA912 JDA904 2 5 JDA909 JDA901 JDA911 JDA903 3 JDA908 JDA900 JDA910 JDA902 3 5 JDA907 i JD909 4 JDA906 5 JDA908 E 4 5 JDA905 i JDA907 5 JDA904 JDA906 5 5 JDA903 5 JDA905 6 JDA902 i JDA904 gt 6 5 JDA901 JDA903 7 JDA900 JDA902 Table 3 Receiver attenuator selection guide
12. XF030 30 47 MHz CXF042 42 54 MHz CXF050 50 70 MHz and CXF065 65 85 MHz It is also possible to order the node with no diplexers in which case the diplex filters are replaced by forward path jumpers CXFOOO The return path can be configured with a return path module A return path split module can be used to provide return path segmentation whereas a return path combiner module is used to provide signal redundancy There is a variety of return transmitters available for the Access platform Table 5 It is also possible to order the AC8000 platform with only one optical transmitter installed and add a second transmitter for backup or segmentation reasons later To take the return path into use one of these optical return transmitters must be installed Type Description AC6830 FP 1310 nm 7 dBm AC6835 FP 1310 nm 3 dBm AC6840 FP 1310 nm 1 dBm AC6845 DFP 1310 nm 3 dBm AC6847 CWDM 1470 nm 3 dBm AC6849 CWDM 1490 nm 3 dBm AC6851 CWDM 1510 nm 3 dBm AC6853 CWDM 1530 nm 3 dBm AC6855 CWDM 1550 nm 3 dBm AC6857 CWDM 1570 nm 3 dBm AC6859 CWDM 1590 nm 3 dBm AC6861 CWDM 1610 nm 3 dBm Table 5 Optical return transmitters Gain control Pilot Set driving level for the laser by installing appropriate attenuator in the transmitter Attenuators of the JDA900 series type ranging from 0 dB to 20 dB in 1 dB steps are available The front panel label Fig 15 describes the
13. able for easy and fast installation AC6311 with one power supply and AC6312 with two power supplies The field replaceable housing lids are shipped completely including the connection cable and mounting materials Equipped with dual power supplies the AC8000 platform offers complete system redundancy Transponder AC8000 nodes can be remotely monitored and controlled via the plug in transponder unit Locally the transponder unit can communicate with a lap top computer or hand held terminal With this transponder unit it is possible to monitor received optical level transmitters laser current remote voltage both power supply output voltages internal temperature and lid status Furthermore the transponder is able to control the backup switching return path transmitter as well as return path ingress switches Automatic Level Control Platform features also an automatic microprocessor controlled output level control ALC The ALC function allows monitoring and control of a large number of parameters in the nodes optimizing the performance of the platform WEEE Notice This product complies with the relevant clauses of the European Directive 2002 96 EC on Waste Electrical and Electronic Equipment WEEE The unit must be recycled or discarded according to applicable local and national regulations E European Conformity This equipment conforms to all applicaple regulations and directives C of European Union which concern it and ha
14. be measured from the optical transmitters OMI test point Fig 11 pos 15 or 16 In the front panel label of the return transmitter is described the driving level at the OMI test point that gives 4 OMI channel The return signal level should be adjusted to match this level which is specific for each unit For other OMI values the needed adjustment setting can be calculated from the formula 20 x log new OMI 4 Depending on the nature of the return signal the input level can be measured as follows e When using a reference or test signal the level of the carrier signal is measured from the test point and it is adjusted to a value shown in the unit s label or calculated from it e When using a digital noise like signal the spectrum analyser s noise marker is adjusted to the same bandwidth as the digital signal has and the level is adjusted to the value shown in the unit s label or calculated from it Utilising remotely controlled ingress switch allows the operator to isolate problems in return path and take corrective actions The return path signal can either be cut off i e signal is attenuated more than 45 dB or be attenuated by 6 dB As default factory setting the ingress switch is set to 0 dB position Since homes may not always be connected to return path services the return path RF signal should be cut off by the management unit Once connected the ingress switch should be set to 0 dB position
15. e The transponder unit will automatically detect the current configuration of the Access platform when the user opens the Configuration page The Configuration page displays a graphical view of the current configuration similar to the actual amplifier node layout and also generates a set of viewer pages individual to each active device It is important to start a configuration session by selecting first the Configuration page since it is the only way to generate the module specific viewer pages Status Configuration Motherboard Transponder Repair Log Properties HandHeld Input selection r Return transmitters Automatic Both transmitters on Automatic manual restore C Manual Re 1 C One transmitter on follows active receiver C Manual Rx 2 Receiver modules Optical level limits Type Opticallevel Active Low High Deadband Rx 1 aces20 QB am 70 20 05 dBm Rei2 N A NA dBm 70 20 05 dBm Transmitter modules Laser current limits Type Laser current Pilot Low High Deadband Txt accesso M bw io 390 2 mA Tx 2 NA WA m F 10 90 2 mA Fig 12 The Optical page This page is visible in AC8000 platform only It displays data and settings of the optical transmitter and receiver modules and controls their connection Input selection These settings provide manual or automatic switchover between two input channels in case the incoming
16. e jumper pins The jumper must be positioned prior to installation The primary power supply unit must be installed into the first place closest to the hinges Locate the 10 pin connectors and attach the supplied ribbon cable After PSU installation carefully refit the shroud in the reverse order of removal Ensure that all RFI gaskets are in place before the shroud is refitted TELESTE User Manual AC8000 59300024 Rev 006 Broadband Cable Networks 30 3 2007 8 22 Before connecting the power make sure that e both power supplies are installed in correct positions e jumpers is set correctly Fig 7 Connect the power source The LED on the PSU circuit board indicates that the unit is powered up and that the DC power supply voltage is present 8603052 PSU2 Make sure the jumper is on the right hand location von PSU1 Make sure the jumper is on the left hand location Fig 7 Diagram illustrating the AC8000 lid with both PSUs installed TELESTE User Manual AC8000 59300024 Rev 006 Broadband Cable Networks 30 3 2007 9 22 Fibre organiser mechanics The node is equipped with a double sided fibre organiser module It is meant to be the installation chassis for the fibre pigtails Access units and installation fibre filaments external fibre optic cables 8604076 Fig 8 AC8000 fibre
17. f two optical receivers are used the primary signal must always be connected to optical receiver 1 since it is always in use even if the transponder is not installed The transponder is able to switch automatically the transmission to the secondary fibre route in a case of primary route failure The output stage uses a GaAs hybrid to improve RF performance over the entire 47 to 862 MHz passband A diplex filter is selected during configuration according to the preferred frequency split The second output port through the use of plug in output modules can be set up for a variety of output configurations Refer to the Table 2 Output modules Output module Description AC6112 1 12 dB tap AC6116 1 16 dB tap AC6119 1 20 dB tap AC6120 0 dB output module AC6124 Two way splitter AC6128 2 9 dB tap Table 2 Output modules Gain control The optical receiver module is delivered without an attenuator plug If necessary use an attenuator plug in to get appropriate RF level Attenuators of the JDA900 series type ranging from O dB to 20 dB in 1 dB steps are available The attenuator value depends not only on the optical input level but also on the optical receiver type and the OMI Refer to the Table 3 Receiver attenuator selection guide TELESTE User Manual AC8000 59300024 Rev 006 Broadband Cable Networks 30 3 2007 13 22 Optical input power Optical input power can be measured with optical po
18. s gone through relevant conformity assessment procedures TELESTE User Manual AC8000 59300024 Rev 006 Broadband Cable Networks 30 3 2007 3 22 Housing 8604043 J Iga l Att Et m E T E IF tp i Fig 1 AC8000 housing dimensions top and side view Installation The AC8000 can be installed either into a street cabinet or to the outdoor environment The node should be installed in a vertical position so that the external cable connectors are underneath Secure the housing with three mounting brackets see fig 1 for the positions of mounting brackets as well as other installation dimensions The cover opens with the hinges to the left The open cover can be removed by first opening the cover into a 90 degrees angle and the lifting it off the hinges Note Before removing the cover detach carefully the power unit ribbon cable Close the lid by tightening the four retaining bolts in a diagonal sequence Before closing the lid check that e nothing is trapped between the lid and the case e all case gaskets are in their correct positions A sufficient tightening torque is 3 Nm Ensure that the lid seats evenly on the rubber gasket The class of enclosure is IP54 To ground the node housing connect at least 4 mm grounding wire Cu from a proper earth to the grounding point TELESTE User Manual AC8000 59300024
19. sert 8606022 Fig 4 KDO900 adapter components Fibre installation Fibre installation is a critical procedure and it should be done with carefulness Incorrect handling of the fibre can result in damage and degraded performance Example of routing the fibres can be seen in figure 8 Cleaning fibre connectors e For correct optical operation ensure that all optical connectors are cleaned immediately before mating using a suitable optical connector cleaning kit e If a cleaning kit is not available wipe the end of the connector using pure isopropyl alcohol 99 and a lint free wipe Dry it with filtered compressed air Wait until dry to insert connector into the adapter e When fibre optic connectors are unmated the optical fibre end faces must be protected from contamination using suitable dust caps Contamination of fibre end faces will reduce the performance of the optical fibre and could ultimately cause failure of the system Contamination could also damage the fibre end faces when the connectors are mated DANGER Do not look into the optical connector of the return transmitter with power applied Laser light visible or invisible can seriously injure eyes or even cause blindness TELESTE User Manual AC8000 59300024 Rev 006 Broadband Cable Networks 30 3 2007 6 22 Powering The AC6310 is a power supply
20. tage alarm on PSU2 is set at 23 0 V Alarm voltage at a switch closure is typically 18 V 19 V Refer to the user manual of AC6910 AC6940 AC6950 AC PLATFORM TRANSPONDER for details Note If PSU2 is in use and external alarm is enabled the only way to confirm proper operation of the PSU2 is visually check the LED on the PSU circuit board ribbon cable clamp ribbon cable header pone 100 es O alarm jumper external alarm connector alarm switch OPEN no alarm CLOSED alarm Fig 5 Alarm jumper on the power distribution board Alarm connected to EMT module Jumper position PSU2 alarm default Cr e External alarm J o ol Table 1 Alarm jumper configurations TELESTE User Manual AC8000 59300024 Rev 006 Broadband Cable Networks 30 3 2007 7 22 Installing the PSU To gain access to PSU retaining screws first remove the protective shroud The shroud is attached to the lid to shield the electronics from electromagnetic interference Install the PSU board with the four M3x8 mm torx screws Use the silicon elastomers between the unit and the heatsink brackets Make sure to use the fixing springs in the locations marked with B Fig 6 ac8k_power_b Fig 6 AC6310 mounting screws A fixing springs B and silicon elastomers C Primary and secondary power supplies are physically identical Their functional differences are controlled by a jumper See fig 7 for locations of th
21. unit PSU to be used in AC8000 lid mechanics The node is supplied with 27 65 V AC or 35 90 V DC either via a coaxial cable or directly at the external input The external input is located on the power distribution board at the upper right corner of the amplifier Fig 5 External power can also be fed through the amplifier into the network Maximum feed through current is 10 A per port 15 A total If powering will be provided through a dedicated output port the port must be equipped with a fuse supplied In general only one power supply is needed in the node However the power supply unit can work alone or in dual operation mode if a back up of the PSU is needed In dual powering operation the units are connected in parallel operating in a passive load sharing mode The output voltages can be monitored through the EMT module The power supply unit also has an auto shut down feature which prevents too high input currents if the input voltage should drop below 24 V AC The external alarm connector on the power distribution board Fig 5 can be configured to allow input of one external alarm to be monitored with the EMT module When external alarm is enabled with the jumper the alarm will be displayed instead of the PSU2 alarm Table 1 shows the correct jumper configurations The external alarm input is normally connected to a switch An alarm is activated when the switch is closed Whenever external alarm is enabled verify that the low vol
22. wer meter or at the receiver DC test point The test point DC voltage is directly proportional to optical input power in mW e g 1 0 V corresponds to 1 0 mW average optical power In case of a 1310 nm wavelength selection the input power in dBm W can be calculated by the formula Pin dBm 10 log Usp When using 1550 nm transmitters the input power is 0 5 dB lower than this formula indicates Do not connect any voltage to the test point or short circuit it to ground Use a voltage meter with an input resistance higher than 100 kohms The LED on the receiver s front panel gives a visual indication of the optical input power LED on AC6810 Condition Yellow Optical input power drops below 10 0 dBm Optical input power is within the nominal range 10 0 3 0 dBm Red Optical input power exceeds 3 0 dBm Green LED on AC6820 Condition Yellow Optical input power drops below 4 5 dBm Optical input power is within the nominal range Green 4 5 3 0 dBm Red Optical input power exceeds 3 0 dBm The user can specify all the limits for the LED indication of the optical input power with the transponder unit Therefore the above mentioned limits are valid only if the transponder unit is not installed TELESTE User Manual AC8000 59300024 Rev 006 Broadband Cable Networks 30 3 2007 14 22 Element management transponder Some of the parameters can be controlled and monitored through the transponder interfac
Download Pdf Manuals
Related Search