Comtech EF Data CDD-880 Installation And Operation Manual Download Page 1

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Comtech EF Data, 2114 West 7th Street, Tempe, Arizona 85281 USA, 480.333.2200, FAX: 480.333.2161

CDD-880

Advanced VSAT Series Multi Receiver Router

Installation and Operation Manual

For Firmware Version 1.6.2.X or Higher

Part Number MN-CDD880 / CD-CDD880

Revision 2

Summary of Contents for CDD-880

Page 1: ...e USA Comtech EF Data 2114 West 7th Street Tempe Arizona 85281 USA 480 333 2200 FAX 480 333 2161 CDD 880 Advanced VSAT Series Multi Receiver Router Installation and Operation Manual For Firmware Versi...

Page 2: ...BLANK PAGE...

Page 3: ...t xvii European Union Radio Equipment and Telecommunications Terminal Equipment R TTE Directive 1999 5 EC and EN 301 489 1 xviii European Union Electromagnetic Compatibility EMC Directive 2004 108 EC...

Page 4: ...tor 1 9 1 4 3 1 Receive 1 10 1 4 3 2 Low Noise Block Down Converter LNB Support 1 10 1 4 4 BER Bit Error Rate 1 11 1 4 4 1 BER Monitor Functions 1 11 1 4 5 Regulatory Compliance 1 11 CHAPTER 2 INSTALL...

Page 5: ...FIRMWARE 4 1 4 1 Firmware Update Overview 4 1 4 2 Getting Started Prepare for the Firmware Download 4 2 4 3 Download and Extract the Firmware Update 4 6 4 4 Perform the Ethernet FTP Upload Procedure...

Page 6: ...onfiguration WAN LNB Low Noise Block Down Converter 6 25 6 3 3 3 Configuration Network Pages 6 26 6 3 3 3 1 Configuration Network Routing 6 26 6 3 3 3 2 Configuration Network ARP 6 28 6 3 3 3 3 Config...

Page 7: ...ion Options A 2 A 3 VersaFEC ACM Adaptive Coding and Modulation Operation A 3 A 4 BPM Bridge Point to Multipoint Operation A 4 A 5 ECM Entry Channel Mode Operation A 5 A 6 dMesh VMS Dynamic Mesh Conne...

Page 8: ...eory of Operation D 3 D 1 2 1 CDD 880 ECM Message Processing D 5 D 1 2 2 CDM 840 ECM Message Processing D 6 D 2 ECM Operational Scenarios D 7 D 2 1 Scenario 1 VMS Initial Registration Process D 7 D 2...

Page 9: ...Demand SHOD F 6 F 3 2 Dynamic Mesh Operation F 6 F 3 2 1 Create a Distribution List F 7 F 4 Compatibility F 11 F 5 Summary F 11 APPENDIX G DPC VMS DYNAMIC POWER CONTROL G 1 G 1 DPC Dynamic Power Cont...

Page 10: ...w H 1 H 2 Background H 2 H 3 VersaFEC ACM H 3 H 3 1 VersaFEC ACM Latency H 4 H 4 Managing VersaFEC ACM Operation H 5 H 4 2 Troubleshooting H 9 H 4 3 Monitoring ACM Performance H 9 H 4 4 MODCOD Switch...

Page 11: ...e 3 10 Apply DC Power to the Unit 3 14 Figure 3 11 Replace the DC Fuses 3 15 Figure 5 1 CDD 880 HTTP Interface Admin FAST page 5 2 Figure 6 1 CDD 880 Serial Interface 6 2 Figure 6 2 CDD 880 HTTP Inter...

Page 12: ...CM Message Processing Diagram D 1 Figure D 2 ECM Message Processing CDD 880 Multi Receiver Router D 5 Figure D 3 ECM Message Processing CDM 840 Remote Router D 6 Figure D 4 CDD 880 HTTP Interface Spla...

Page 13: ...0 HTTP Interface and Menu Tree Route Creation BERT Operations FW Ver 1 6 2 X H 6 Figure H 3 CDM 840 HTTP Interface and Menu Tree VersaFEC ACM BERT Operations FW Ver 1 6 2 X H 7 Figure H 4 CDD 880 HTTP...

Page 14: ...CDD 880 Multi Receiver Router MN CDD880 CD CDD880 Table of Contents Revision 2 xiv BLANK PAGE...

Page 15: ...nance of the CDD 880 Related Documents Comtech EF Data CTOG 250 Comtech Traffic Optimization Gateway with CDM 800 Gateway Router Installation and Operation Manual CEFD P N MN CTOG250 Comtech EF Data C...

Page 16: ...bout a possible hazard that MAY CAUSE INJURY or PROPERTY DAMAGE A NOTE gives important information about a task or the equipment A REFERENCE Examples of Multi Hazard Notices directs the user to additi...

Page 17: ...950 SAFETY IS NOT GUARANTEED Electrical Installation CAUTION CONNECT THE UNIT TO A POWER SYSTEM THAT HAS SEPARATE GROUND LINE AND NEUTRAL CONDUCTORS DO NOT CONNECT THE UNIT WITHOUT A DIRECT CONNECTION...

Page 18: ...Technology Equipment Immunity EN 55024 Information Technology Equipment Immunity Characteristics Limits and Methods of Measurement EN 61000 3 2 Harmonic Currents Emission EN 61000 3 3 Voltage Fluctuat...

Page 19: ...n Electrical and Electronic Equipment EU RoHS Directive 2002 95 EC European Union Telecommunications Terminal Equipment Directive 91 263 EEC In accordance with the European Union Telecommunications Te...

Page 20: ...re limited to repair or replacement of failed parts and the return shipment to the buyer of the repaired or replaced parts Limitations of Warranty The warranty does not apply to any part of a product...

Page 21: ...ar purpose The buyer shall pass on to any purchaser lessee or other user of Comtech EF Data Corporation s products the aforementioned warranty and shall indemnify and hold harmless Comtech EF Data Cor...

Page 22: ...CDD 880 Multi Receiver Router MN CDD880 Preface Revision 2 xxii Notes...

Page 23: ...group of products Feature Description A Hub Site B Typical Remote Site Cluster Figure 1 2 Advanced VSAT Series Network Topology Example Comtech s Advanced VSAT Series group of products Figure 1 2 are...

Page 24: ...nce processor and a real time operating system RTOS combined with multiple Field Programmable Gate Arrays FPGAs Runs on an embedded operating system in non volatile Flash memory It does not have movin...

Page 25: ...lacement into a rack The unit can be free standing if desired Sect 1 4 CDD 880 Specifications Sect 2 2 Installation into a Rack Enclosure 1 3 1 1 Standard Assemblies Assembly Description Where Install...

Page 26: ...CDD 880 Multi Receiver Router MN CDD880 Introduction Revision 2 1 4 1 3 2 Dimensional Envelope Figure 1 3 CDD 880 Dimensional Envelope...

Page 27: ...ch can be viewed from the Web Server Interface or retrieved via the remote control interface Off There are no Stored Events ONLINE Green The Unit is On Line and carrying traffic Off The Unit is Off Li...

Page 28: ...Figure 1 5 TOP Standard AC Unit BOTTOM Optional 48V DC Unit Figure 1 5 CDD 880 Rear Panel View 1 3 3 2 1 Rear Panel Standard Features As per Figure 1 5 from left to right Power Interface 115 230 VAC P...

Page 29: ...al Rear Mounting Support Brackets Kit 1 3 4 On site Firmware Updates Chapter 4 UPDATING FIRMWARE Field update of the operating system firmware is possible through file upload via satellite or the Ethe...

Page 30: ...Processor Supported Protocols RFC 768 UDP RFC 791 IP RFC 792 ICMP RFC 793 TCP RFC 826 ARP RFC 856 Telnet RFC 862 Ping RFC 894 IP RFC 959 FTP RFC 1112 IP Multicast RFC 1213 SNMP MIB II RFC 1812 IPv4 R...

Page 31: ...ed bandwidth This spec allows the entire 950 to 2150 MHz L Band to be filled with an average uniform spectral density that is 14 dB greater than the desired carrier spectral density Absolute Maximum N...

Page 32: ...ps QPSK 0 706 23 kbps 4 8 Mbps QPSK 0 803 26 kbps 7 22 Mbps 8 QAM 0 642 31 kbps 8 67 Mbps 8 QAM 0 711 35 kbps 9 6 Mbps 8 QAM 0 780 38 kbps 10 53 Mbps 16 QAM 0 731 47 kbps 13 16 Mbps 16 QAM 0 780 50 kb...

Page 33: ...rrier BER 10 5 BER 10 8 Rate 0 642 8QAM 4 6 dB 4 3 dB 4 9 dB 4 6 dB Rate 0 711 8QAM 5 2 dB 4 9 dB 5 5 dB 5 2 dB Rate 0 780 8QAM 5 6 dB 5 3 dB 6 0 dB 5 7 dB VersaFEC CODEC BER 16QAM With two adjacent c...

Page 34: ...CDD 880 Multi Receiver Router MN CDD880 Introduction Revision 2 1 12 Notes...

Page 35: ...ation and Operation Manual otherwise available online at http www comtechefdata com and its power cord were packaged and shipped in a reusable cardboard carton containing protective foam spacing CAUTI...

Page 36: ...Support CAUTION CORRECT GROUNDING PROTECTION IS REQUIRED TO PREVENT PERSONAL INJURY AND EQUIPMENT DAMAGE You must make sure the ground stud on the rear panel of the unit is always connected to the pr...

Page 37: ...allation Revision 2 2 3 Feature Description 1 Custom Rack Enclosure 2 CDD 880 Unit 3 Standard Rack Shelving 4 Rack Enclosure Threaded Front Rail typical 5 Unit Front Panel 6 User supplied Screws Figur...

Page 38: ...Adapter 2 4 4 HW 10 32X3 8FLT Screw 10 Flat Head 3 1 KT 6228 2 4 Rear Support Bracket Kit 1 KT 6228 3 10 Rear Support Bracket Kit KT 6228 X Rear Support Bracket Kit Item Quantity CEFD Part Number Des...

Page 39: ...1 Assemble the Adapter Plates to the back sides of the CDD 880 chassis using the 10 Flat Head Screws 2 Assemble the 10 Shoulder Screws through the Adapter Plate mounting slots using the 10 Flat Washe...

Page 40: ...CDD 880 Multi Receiver Router MN CDD880 Installation Revision 2 2 6 Notes...

Page 41: ...er Router use a number of different cables Each cable type is typically dedicated to a specific mode of operation 1 Not all of these operational interface types may be available 2 The European EMC Dir...

Page 42: ...ckdown slots This lockdown design provides secure assembly without over tightening the connection Threaded Coupling Style The jack features external threads The plug shell features internal threads an...

Page 43: ...ar to Type N Type F and Type SMA connectors 3 1 1 3 Type N Type N connectors feature a Threaded Coupling design similar to Type TNC Type F and Type SMA connectors 3 1 1 4 Type F Type F connectors feat...

Page 44: ...ection to the jack nuts provided on the mating chassis receptacle The jack screws may be hand tightened or tightened with a standard flat blade screwdriver Connection Instructions Orient the plug to t...

Page 45: ...e Figure 3 3 CDD 880 in an Advanced VSAT Network Figure 3 3 illustrates the CDD 880 s use in an Advanced VSAT Network At top the primary cabling connections are shown for a typical CDD 880 rear panel...

Page 46: ...rs Service Type Ch Sect Name Connector Type Connector Function IF Connector 3 3 1 L BAND Rx 50 Type N female L Band Rx Input Utility Connector Group 3 3 2 REDUNDANCY D sub 9 pin female FUTURE For conn...

Page 47: ...oing this the effect in most systems will be negligible 3 3 2 Utility Connector Group 3 3 2 1 REDUNDANCY Connector DB 9F FUTURE This interface is intended for future use for connection to an optional...

Page 48: ...dard configuration settings for the serial interface are provided here Connector Type Name Direction D sub 9 pin male REMOTE In Out Table 3 3 CONSOLE Connector Pinout Pin Description Direction 1 Groun...

Page 49: ...tion 1 Ground 9 Reserved do not connect to this pin 2 Reserved do not connect to this pin 10 Reserved do not connect to this pin 3 Constellation Q channel Out 11 Constellation I channel Out 4 Reserved...

Page 50: ...o Multipoint Mode including Ethernet headers and 2 VLANs This port features two operational LED indicators o LNK Comms Link detected glows amber o ACT Activity detected flashes green 3 3 3 Terrestrial...

Page 51: ...Chassis Ground Interface Use the 10 32 stud located adjacent to the power interface Figure 3 5 for connecting a common chassis ground among equipment CAUTION CORRECT GROUNDING PROTECTION IS REQUIRED...

Page 52: ...100V to 240V AC 6 10 autosensing total absolute max range is 90 to 254VAC Connector Type IEC 60320 Type C13 C14 Fuse Protection Line and neutral fusing 2X T3 15A 20mm Slow blow type fuses Figure 3 6 A...

Page 53: ...ses WARNING DEATH OR PERSONAL INJURY IS POSSIBLE DISCONNECT THE POWER SUPPLY BEFORE PROCEEDING CAUTION ALWAYS REPLACE THE FUSES WITH THE CORRECT TYPE AND RATING SEE FIGURE 3 6 FOR THE AC FUSE SPECIFIC...

Page 54: ...he user supplied and DC power leads to their respective terminals Number 18 AWG minimum wires are recommended 2 Connect the user supplied DC power leads to the user power source 3 Switch the unit ON F...

Page 55: ...lace the DC Fuses WARNING DEATH OR PERSONAL INJURY POSSIBLE DISCONNECT THE POWER SUPPLY BEFORE PROCEEDING CAUTION ALWAYS REPLACE THE FUSES WITH THE CORRECT TYPE AND RATING SEE FIGURE 3 9 FOR THE DC FU...

Page 56: ...CDD 880 Multi Receiver Router MN CDD880 Rear Panel Connections Revision 2 3 16 Notes...

Page 57: ...he firmware Obtain the firmware update archive file from Comtech EF Data Product Support Establish the proper communications link for acquiring the firmware update archive files by directly connecting...

Page 58: ...to connect the PC serial port to the CDD 880 a Use an Ethernet hub switch or direct cable connection to connect the CDD 880 rear panel ETHERNET TRAFFIC MANAGEMENT GE 10 100 1000 Gigabit Ethernet port...

Page 59: ...SERIAL BASED REMOTE PRODUCT MANAGEMENT for information and instructions on using the CDD 880 Serial Interface f Alternately use the CDD 880 HTTP Interface to obtain the firmware information On the PC...

Page 60: ...bmenu Rename this folder to temp or some other convenient unused name b Use Windows Explorer to create and rename the temporary folder Select File New Folder to create the temporary folder The new fol...

Page 61: ...indows OS versions prior to Windows 95 click the MS DOS Prompt icon from the Main Menu Next open a Command line window o For Windows 95 or Windows 98 Type command o For any Windows OS versions later t...

Page 62: ...program Some firewalls do not allow the download of exe files Download the zip file instead and extract the firmware files from the archive download with a user supplied utility program For detailed i...

Page 63: ...There are several ways you may view the contents of the temporary folder on a Windows based PC a From the Windows Desktop Double left click the temp folder saved to the Windows Desktop Use Windows Exp...

Page 64: ...MWARE HAS BEEN IDENTIFIED USING EITHER THE CDD 880 SERIAL INTERFACE OR THE CDD 880 HTTP INTERFACE ADMIN FIRMWARE PAGE YOU HAVE DOWNLOADED OR OTHERWISE RECEIVED FROM COMTECH EF DATA THE LATEST FIRMWARE...

Page 65: ...ke several minutes for the transfer to occur Once the upgrade file is received the image is written to Flash memory and the unit transmits the message UPLOAD COMPLETE In the event you receive the Conn...

Page 66: ...to continue the reboot process or Cancel to abort the process and return to the Utility Reboot page Once the reboot process resumes the Utility Reboot page is replaced with the dynamic message Please...

Page 67: ...es on site upgrade of the operating feature set without removing a unit from the setup FAST technology allows you to order a unit precisely tailored for the initial application When your service requi...

Page 68: ...nformation on using the CDD 880 HTTP Interface to activate FAST Features Use the HTTP Interface Admin FAST page to manage CDD 880 FAST Features This page provides scrollable list boxes that display th...

Page 69: ...egate Rx Data Rate CCM and Symbol Rate ACM Up to 10 Mbps CCM or 4 Msps ACM Up to 25 Mbps CCM or 10 Msps ACM Up to 50 Mbps CCM or 20 Msps ACM Max Data Rate CCM or Symbol Rate ACM for use with dSCPC onl...

Page 70: ...ore contacting Comtech EF Data Serial Number __________________________ 3 Contact Comtech EF Data Product Support Provide the CDD 880 Serial Number to the representative Identify and purchase the desi...

Page 71: ...E O THE PC ETHERNET PORT IS CONNECTED TO THE CDD 880 REAR PANEL ETHERNET TRAFFIC MANAGEMENT GE 10 100 1000 BASE T GIGABIT ETHERNET M C PORT WITH A USER SUPPLIED HUB SWITCH OR DIRECT ETHERNET CABLE CON...

Page 72: ...et Explorer 6 2 1 Ethernet Management Interface Access Figure 6 1 CDD 880 Serial Interface Access to the CDD 880 Ethernet Management Interfaces requires you to specify the unit Management IP Address Y...

Page 73: ...sociated with operation of the CDD 880 MIB File Name where x is revision letter Description FW10874 2x mib ComtechEFData Root MIB file ComtechEFData MIB file gives the root tree for ALL Comtech EF Dat...

Page 74: ...Web browser allows the full monitoring and control M C of the CDD 880 from its HTTP Interface This non secure embedded Web application is designed for and works best with Microsoft Internet Explorer...

Page 75: ...le and is not updating or that the unit is in a transitional state e g a reboot is in process The virtual LEDs provide heads up operational status indicators that react to any changes made to unit ope...

Page 76: ...blinks when a packet is being received from the satellite link to this unit Amber Rx Traffic has an Alarm Red Rx Traffic has a Fault Off Demod is disabled 6 2 3 2 2 Navigation The HTTP Interface feat...

Page 77: ...saved 6 2 3 2 5 Drop down Lists A drop down list lets you choose from a list of selections Left click the drop down button to open the list Then left click on an item to select that choice 6 2 3 2 6 T...

Page 78: ...iagram block marked with denotes that this page is functional only when a LOW NOISE BLOCK DOWN CONVERTER LNB is installed and is recognized as operational Figure 6 2 Illustrates the menu hierarchy for...

Page 79: ...the subsections that follow through the end of this chapter 2 The HTTP Interface pages as depicted in the figures featured through the end of this chapter do not show the page banner and VFP Virtual...

Page 80: ...Receiver Router MN CDD880 Ethernet based Remote Product Management Revision 2 6 10 6 3 1 2 Home Contact For all product support please call 1 240 243 1880 1 866 472 3963 toll free USA Figure 6 4 Home...

Page 81: ...NMP FAST Firmware Auto Logout or VMS tab to continue 6 3 2 1 Admin Access The Administrator must use this page to manage the CDD 880 HTTP Interface user access settings Figure 6 5 Admin Access Page Us...

Page 82: ...ION IP ADDRESS FEATURE IS A FUTURE OFFERING IT IS NOT OPERATIONAL AT THIS TIME Enter an SNMP Read Community string The SNMP Read Community string can be any combination of characters and a length of 4...

Page 83: ...AST ACTIVATION PROCEDURE for the complete information on activating your FAST Features via the CDD 880 HTTP Interface 1 Header and Payload Compression are standard non FAST operational features for Co...

Page 84: ...firmware versions loaded into Slot 1 and Slot 2 Firmware Configuration Use the Boot From drop down list to select Latest Slot 1 or Slot 2 The default selection is Latest in which the unit will automa...

Page 85: ...nit remains idle i e when no user activity occurs beyond your designated Logout Time You must then log in with a valid user name and password to resume use of the CDD 880 HTTP Interface Figure 6 9 Adm...

Page 86: ...networks each with its own unique network ID number Management Base Port The Management Base Port sets the starting IP port addressing for all VMS and ACM messages CAUTION MAKE NOTE OF THE FOLLOWING U...

Page 87: ...ceive management messages from the VMS This address must match the VMS Transmit Multicast Address Once the CDD 880 is registered in the Vipersat network the VMS takes full management control of the Da...

Page 88: ...rbit is not available in this firmware release The MEO tab and its nested page while available and selectable on this interface are therefore NOT OPERATIONAL 6 3 3 1 Configuration Interface Ethernet U...

Page 89: ...ask 8 to 30 Use this box to enter the IP Address and CIDR Classless Inter Domain Routing Subnet Mask 1 The IP Addresses for the ETHERNET TRAFFIC MANAGEMENT GE and ETHERNET TRAFFIC GE ports must be dif...

Page 90: ...ue The LNB page is functional ONLY when this optional product is installed 6 3 3 2 1 Configuration WAN Demod Demodulator The upper range of Data and Symbol Rate selection requires activation of the op...

Page 91: ...on is noted in parentheses Rx RF Frequency 0 to 67080 MHz This is the frequency at which the terminal receives from the satellite Once you enter a non zero Rx RF Frequency or Rx L Band Frequency value...

Page 92: ...ches During these times some page functionality becomes disabled and affected features display information on a read only basis For each operating demodulator note the following selections on a per co...

Page 93: ...ication label for the demod Click Submit to save Acquisition Range The Acquisition Range is programmable in 1kHz increments subject to the following Below 64 ksymbols sec 1 to Rs 2 kHz where Rs symbol...

Page 94: ...from 5 dB to 35 dB Current Rx MODCOD This is the current MODCOD of the demod It is used to measure the Current Es No Rx ACM Events read only Event information is logged as sequentially From left to r...

Page 95: ...6 14 Configuration WAN LNB Page LNB Control The acceptable valid operating range for each item in this section is provided in parentheses LNB DC Power Use the drop down list to select the power as Off...

Page 96: ...to Multipoint BPM mode user traffic will pass through the various traffic ports however you must manage the network through the routed Management Network Use this page to enter static routes for IP t...

Page 97: ...he Route Table index number automatically decrements to the next available number Route Table Edit Use the text boxes and drop down lists to edit all current Route Table entries as described previousl...

Page 98: ...ot add Static ARP entries Dynamic ARPs should function as expected under normal operation You should use Static ARP entries only when it has been demonstrated that a connected networking device does n...

Page 99: ...he CTOG 250 that is associated with this CDD 880 Figure 6 17 Configuration Network Assoc CTOG Page Associated CTOG 250 Static CTOG 250 IP Enter the desired static IP Address in the form xxx xxx xxx xx...

Page 100: ...de Page Working Mode Select the desired working mode In Router Mode the traffic ports of the CTOG 250 CDD 880 and CDM 840 are configured to function as a Router In BPM Mode all L2 L3 L4 protocols such...

Page 101: ...or service outage Use this page to configure ECM Figure 6 19 Configuration ECM Page ECM Hub Configuration The acceptable valid operating ranges for items in this section are provided in parentheses E...

Page 102: ...RF frequency values in TAP messages Resolution 100Hz Satellite Frequency Conversion Assign the correct Satellite Frequency Conversion value in MHz for this hub unit based on the RF equipment used at t...

Page 103: ...rational statistics for the Ethernet Demodulator or Router traffic Figure 6 20 Status Statistics Traffic Page Demod Statistics From left to right Column Description Packets Received This is the total...

Page 104: ...received MC Packets Transmitted This is the total number of Multicast packets transmitted MC Packets Received This is the total number of Multicast packets received Current Tx Rate kbps This is the m...

Page 105: ...es from the page Demod Statistics From left to right Column Description Demod This is the available filled demodulator slot automatically assigned in pairs per each installed dual demodulator card Pac...

Page 106: ...reater than 2047 bytes Satellite Packets Rx Undersized Errors This is the number of packets dropped because size is smaller than WAN frame usually due to channel noise From left to right Column Descri...

Page 107: ...umulative Interface Router and Management traffic information Figure 6 22 Status Statistics Router Page Clear Statistics Click Clear to clear all router statistics from the buffer Interface Router Man...

Page 108: ...h From left to right Column Row Description Parameter Packets LAN Rx This is the number of packets that were received from the Ethernet interface WAN Rx This is the number of packets that were receive...

Page 109: ...ummary input port status plus a scrollable window that displays any events and alarms as logged by the unit during normal operation The example here shows the page appearance with the CDD 880 equipped...

Page 110: ...ate The maximum performance due to AGC is RSL_max RSL_min 50 dB In order to calculate the expected RSL you must then know the current Symbol Rate and use these conversion formulae The CDD 880 is desig...

Page 111: ...tries from the Events log The log and counter then resets to a single entry INFO Event Log Cleared 6 3 4 2 2 Status Monitor Alarms This page indicates whether or not an event or alarm has been logged...

Page 112: ...status is FAULTED Clear Alarms Click Clear Previously Alarmed to update this page with the latest available logged event or alarm information Unit BPM Demodulator Alarms Typical for these remaining p...

Page 113: ...Utility Use this page to define and access a variety of top level system operation controls stored unit configurations and test utilities Figure 6 26 Utility Utility Page Modem Unit Name The product e...

Page 114: ...uration set o First adjust all operational configuration parameters to suit o Then use the top Save Select Location dropdown to select 1 through 10 o Finally click Save Configuration to store the conf...

Page 115: ...ERT Pattern as 2 23 1 223 1 or 2047 Click Submit to save the BERT settings and execute the test BERT Monitor This section displays the ongoing BERT Click Restart to restart the BERT Monitor Click Upda...

Page 116: ...boot Click Reboot to reboot the unit A dialogue box appears to prompt continuation or cancellation of the reboot process Click OK to continue the reboot process or Cancel to abort the process and retu...

Page 117: ...he CDM 840 back online through the serial or Telnet Interface over a very slow speed backup channel This interface is NOT intended to be a full featured interface to configure all aspects of the modem...

Page 118: ...rface The CDD 880 Management IP Address has been noted using the CDD 880 Serial Interface The firmware information i e revision letters version numbers etc as shown may differ from your setup Figure 7...

Page 119: ...e Controller device is connected directly to the Target device via a two wire plus ground connection All data is transmitted in framed packets as asynchronous serial characters suitable for transmissi...

Page 120: ...imiter Instruction Code Code Qualifier Optional Arguments End of Packet ASCII Code 60 1 character 0000 default 4 characters ASCII Code 47 1 character 3 characters or ASCII Codes 61 or 63 1 character n...

Page 121: ...er This is the forward slash character ASCII code 47 7 2 2 4 Instruction Code This is a three character alphanumeric sequence that identifies the message subject Uppercase alphabetic characters A to Z...

Page 122: ...ue For example From Controller to Target 0 IG1 means what s the current ETHERNET TRAFFIC GE port IP Address 7 2 2 5 2 Target to Controller Instruction Code Qualifiers The permitted characters are and...

Page 123: ...hanged at present the Target responds by echoing the valid instruction code followed by For example 0000 TFQ with message arguments ASCII Code 35 If the Controller sends a correctly formatted command...

Page 124: ...USED TO C Q Page DPW Set default passwords X 7 9 IG1 Set or query the IP Address and network prefix for the 10 100 1000 BaseT GigE ETHERNET TRAFFIC GE port X X 7 9 IPA Set or query the IP Address and...

Page 125: ...001 24 IG1 IG1 IG1 IG1 IG1 IG1 xxx xxx xxx xxx yy see Description of Arguments Management IP Address IPA 18 bytes numerical Command or Query Sets or returns the IP Address and network prefix for the 1...

Page 126: ...Actual Negotiated Port Speed N A None Query only Returns actual negotiated port speed in the form abcd where a GigE negotiated port speed b the management port negotiated port speed a b c d have the...

Page 127: ...ODM 840 2 This appendix describes features that may be monitored or controlled by the user or otherwise processed by the CDD 880 Multi Receiver Router For detailed reading about the operational featu...

Page 128: ...signal processing in use The Rx receive side of the 840 operates with error correction based upon the DVB S2 standard for QPSK 8 PSK 16 APSK and 32 APSK with concatenated LDPC and Bose Chaudhuri Hocq...

Page 129: ...ade etc Return Link Inbound ACM operation is available in the CDD 880 Multi Receiver Routers and in the CDM 840 and ODM 840 Remote Routers Outbound ACM operation is available in the CDM 800 Gateway Ro...

Page 130: ...hey would through an off the shelf Ethernet Switch The Advanced VSAT System running in BPM Mode supports Flat Networks Flat Networks with Routers and VLAN Trunking network topologies BPM operation is...

Page 131: ...ter may remain in the entry channel for an extended period if online communications are not required or if dSCPC dynamic Single Carrier Per Channel resources are unavailable While idle or waiting in t...

Page 132: ...work s existing hub and remote link and DVB S2 outbound and VersaFEC dSCPC to the return link Comtech EF Data manages these elements and provides BoD in a mesh environment through its Vipersat Managem...

Page 133: ...ient link margin exists in order to optimize group station uplink saturation and or satellite transponder power usage reducing costs Increase link availability when margins apply typically Ku Band or...

Page 134: ...CDD 880 Multi Channel Receiver MN CDD880 Appendix A Revision 2 A 8 Notes...

Page 135: ...f LDPC incorporated research into ways to reduce the block size of LDPC and hence its latency while preserving the coding gain performance very close to the Shannon bound The result is development of...

Page 136: ...Modulation MODCOD No Code Rate Spectral Efficiency bps Hz Block Size kbits Typical Eb No for BER 5 x 10 8 dB Latency at 64 kbps in milliseconds Data Rate CCM Mode Minimum kbps Maximum Mbps BPSK 00 0...

Page 137: ...te the guaranteed error performance characteristics of the CDD 880 Figure B 2 VersaFEC Codec BPSK Rate 0 488 1E 9 1E 8 1E 7 1E 6 1E 5 1E 4 1E 3 1E 2 1E 1 1 2 3 4 5 6 7 8 9 10 11 12 Eb No in dB Uncoded...

Page 138: ...1E 8 1E 7 1E 6 1E 5 1E 4 1E 3 1E 2 1E 1 1 2 3 4 5 6 7 8 9 10 11 12 Eb No in dB Uncoded BPSK QPSK Comtech VersaFEC Codec Rate 0 533 0 631 0 706 and 0 803 QPSK 1 2 3 4 5 6 7 8 9 10 11 12 BER Rate 0 533...

Page 139: ...9 1E 8 1E 7 1E 6 1E 5 1E 4 1E 3 1E 2 1E 1 1 2 3 4 5 6 7 8 9 10 11 12 Eb No in dB Uncoded BPSK QPSK Comtech VersaFEC Codec Rate 0 642 0 711 0 780 8 QAM 1 2 3 4 5 6 7 8 9 10 11 12 BER Rate 0 711 8 QAM...

Page 140: ...1E 6 1E 5 1E 4 1E 3 1E 2 1E 1 1 2 3 4 5 6 7 8 9 10 11 12 Eb No in dB Rate 0 780 16 QAM Uncoded BPSK QPSK Typical Performance shown guaranteed performance curves are 0 3dB to the right Rate 0 731 16 QA...

Page 141: ...int to Multipoint feature is to make the Advanced VSAT equipment appear as a Sky Ethernet Switch This allows for a greatly simplified network deployment In BPM Mode all L2 L3 L4 protocols such as VLAN...

Page 142: ...mote terminal to gain access to the Network Flat Network A network in which all devices are directly connected to each other and all devices are on the same IP subnet IGMP Internet Group Management Pr...

Page 143: ...re E 2 all devices are on the same IP subnet This is a very easy to use topology for simple and or small networks Figure E 2 Flat Network C 2 2 Flat Network with Routers This variation of the Flat Net...

Page 144: ...break out the VLAN into the desired network topology In addition you can optionally configure the CDM 840 in Access Mode with a user assigned VLAN ID see Sect E 4 Figure E 4 BPM with VLANs C 3 Packet...

Page 145: ...er Mode When in BPM Mode the Traffic ports on the Advanced VSAT units do not have IP Addresses as you would expect from an Ethernet Switch Therefore the units cannot be managed SNMP Web Telnet or ping...

Page 146: ...through the modem The CDD 880 is a receive only pass through in BPM Mode As such it receives the packets from the remotes and passes them to the CTOG 250 for processing and forwarding C 4 2 Access Mo...

Page 147: ...LAN headers will not be compressed C 5 Multicast BPM Behavior In BPM Mode Multicast packets are forwarded in two directions Outbound Path CTOG 250 CDM 840 Multicast packets arriving at the CTOG 250 ar...

Page 148: ...ng criteria configurable via NetVue or the Web page for each CDM 840 Downlink outbound from the Hub Segment Multicast All All downlink outbound Multicast packets pass to the Traffic LAN interface of t...

Page 149: ...configured VLAN tag If more than one QoS Group has the packet s VLAN ID then the QoS Group with the matching Subnet Mask will be used QoS Groups with a different VLAN ID or no VLAN IDs will not be ma...

Page 150: ...hat the following holds true for all Advanced VSAT deployments The Management IP Addresses for all units have IP connectivity to the NetVue and VMS server s IP Address CDD 880 management ports must ha...

Page 151: ...ion for each of the respective outbound networks however you MUST configure the Static CTOG 250 IP that is found on the CDD 880 Configuration Network Working Mode web page Once you set this value then...

Page 152: ...CDD 880 Multi Receiver Router MN CDD880 Appendix C Revision 2 C 12 Figure E 10 Multiple CTOG 250 Outbounds in Redundant Mode...

Page 153: ...VLAN tag VLAN tag 802 3 802 2 SNAP MPLS Includes the following L3 L4 Protocols IP UDP TCP RTP Payload Compression PTP Precision Timing Protocol RANOP with E1 dSCPC with VMS Entry Channel Mode ECM AES...

Page 154: ...plies to CTOG 250 CDM 840 CDD 880 VLAN Access Mode Support CDM 840 will support VLAN Access Mode for a single VLAN ID Access Port VLAN ID 1 4095 WAN Labels 1 2047 Must be unique across all CDM 840s th...

Page 155: ...m Factor Remote Router ODMR 840B Remote Router Board Set Installation and Operation Manual CEFD P N MN ODM840 Figure D 1 ECM Message Processing Diagram Figure D 1 illustrates the processing diagram fo...

Page 156: ...users HCC Hub Channel Controller The HCC is a dedicated CDD 880 that generates the TAP and is responsible for all request transactions from each CDM 840 while in Entry Channel Mode LNB Low Noise Bloc...

Page 157: ...d but did not receive a response is also provided these CDM 840s are assigned a slot for the next cycle Each associated CDM 840 achieves loose time synchronization via the broadcast TAP message transm...

Page 158: ...DM 840 indicates that registration with VMS is complete via one of the flags in the RID message on behalf of the CDM 840 the HCC requests dSCPC assignment by placing the CDM 840 IP Address into the sw...

Page 159: ...A RID Detected add to Detection List of TAP 2 TAP In Assigned Slot list B RID Detected add to Detection List of TAP 3 SWITCH PENDING In Switch Pending list Switch Request sent to VMS up to 5X in 12 se...

Page 160: ...ssage from VMS Figure D 3 ECM Message Processing CDM 840 Remote Router The CDM 840s are configured to receive the outbound carrier and are given a TAP Group identifier number default 1 that sets the i...

Page 161: ...s a Needs Slot flag in the RID message 3 Receives the HCC response through the TAP assigning an SRS 4 Continues to transmit the registration request message in SRS 5 Receives registration from the VMS...

Page 162: ...ever in any given network there may be many CDM 840s attempting to pass through the ECM channel depending on their state or network environment Other catastrophic and potential real world conditions m...

Page 163: ...mber of bits in a VersaFEC block for the MODCOD of the ECM channel When a CDM 840 is ready to transmit it waits for receipt of a TAP message that establishes time synchronization between all CDM 840s...

Page 164: ...ndom slot in one of the next two frames If it is still not detected Contention Level goes to 3 and the CDM 840 randomly picks a slot in one of the next four frames If the CDM 840 is not detected by Co...

Page 165: ...P INTERFACES AND THE SERIAL BASED REMOTE CONTROL INTERFACES FOR ADVANCED USERS ONLY COMTECH EF DATA STRONGLY ENCOURAGES USE OF THE PERTINENT HTTP INTERFACES FOR MONITOR AND CONTROL M C OF ADVANCED VSA...

Page 166: ...se the CDM 840 HTTP Interface to configure one of three modes states of ECM operation Online Wait or Offline You must also specify an LNB LO Frequency and Satellite Frequency Conversion to accommodate...

Page 167: ...and ECM Operation Menu Tree FW Ver 1 6 2 X Note that ECM uses Demod 1 as the ALOHA channel Proper deployment of ECM in the Advanced VSAT Network requires complimentary configuration of both the hub si...

Page 168: ...ssage that is sent out by this CDD 880 to all of the associated CDM 840s in that group Group ID 0 255 Assigning a unique Group ID number to this CDD 880 i e the HCC and its associated CDM 840s defines...

Page 169: ...is is the automatically assigned internal table index number IP IP address for the identified CDM 840 Remote Router State Current state of this CDM 840 one of the following will apply Probing The unit...

Page 170: ...e whereby the CDM 840 powers up requests network registration and switches to dSCPC at the minimum site policy data rate setting o Wait Keeping a CDM 840 in the ECM channel can result in oversubscript...

Page 171: ...nel Mode ECM This function provides compensation during periods of impaired transmission or for instances when the initial baseline power value is insufficient and assists in maintaining return link i...

Page 172: ...rameter is set in the VMS Probing Duration Amount of time in seconds that this unit has been transmitting to the HCC to request registration and switchout Seconds Until Next Probe The time period in s...

Page 173: ...ts ECM state flag i e Online Wait or Offline into the first queued list The controller checks the flag to determine next operation If the ECM state is Online an SRS is assigned for next TAP processing...

Page 174: ...CDD 880 Multi Receiver Router MN CDD880 Appendix D Revision 2 D 20 Notes...

Page 175: ...ts can be used to route data with Port Diversity disabled each port will have its own IP Address and Subnet Traffic pertaining to that subnet is routed over that interface and manual routes can be rou...

Page 176: ...ose the physical path based first on physical link state and then via BPDU information provided by the switches STP RSTP processes The CDD 880 can react to a failure of any of the numbered links ident...

Page 177: ...cted and Port Diversity is enabled both the Data Traffic GE DATA and Management Traffic GE MGMT IP Addresses of the CDD 880 will be multi homed to the chosen path s interface When a physical path is c...

Page 178: ...iguration CiscoIOS To set up the interface to be Edge Port Portfast interface GigabitEthernet0 7 switchport mode access switchport nonegotiate spanning tree portfast Note that the first two commands d...

Page 179: ...4 1 Port Diversity Operation CDD 880 HTTP Interface Figure E 4 shows the CDD 880 HTTP Interface splash page and the menu tree diagram for accessing Port diversity operation Page functionality not spec...

Page 180: ...bled manual routes are routed to the correct IP subnets but over the same physical port Figure E 6 Configuration Interface Ethernet Page Diversity Port Enabled Once enabled the Port Diversity feature...

Page 181: ...gement and Ethernet Port Traffic Based on the switch environment the CDD 880 elects the best path and uses that port as the active port to pass data over the two subnets Path selection is based first...

Page 182: ...CDD 880 Multi Receiver Router MN CDD880 Appendix E Revision 2 E 8 Notes...

Page 183: ...applications Although there are many satellite modem manufacturers producing new generations of products few provide the means to address point to point or point to multipoint mesh connectivity or of...

Page 184: ...mode of operation that supports dynamic mesh A major advantage of the Vipersat technology is that its design encompasses the use of Comtech EF Data s Advanced VSAT offerings CTOG 250 Comtech Traffic...

Page 185: ...emote CDM 840 subnets thus changing the CDM 840 s Tx frequency power level data rate and a varying assortment of modulation and coding combinations called MODCODs where applicable An available remote...

Page 186: ...satellite system link margin and convert this margin into additional data throughput An ACM system is set up using a constant physical layer symbol rate and therefore occupied bandwidth and power but...

Page 187: ...2 2 2 1 ACM and Dynamic Mesh Although ACM and mesh are independent of one another ACM is supported in a mesh environment Return link ACM for the remote CDM 840 to the hub CDD 880 link is modeled afte...

Page 188: ...f the network must be populated equally with the appropriate number of demodulator cards Such configurations allow transmission of a single carrier from an originating remote CDM 840 a benefit that re...

Page 189: ...to set up a Distribution List Do these steps 1 From the VMS GUI right click on a remote site icon to open the Properties page a Highlight the Distribution Lists tag b Right click in the white space be...

Page 190: ...e that this is the antenna view for R2 Remote 2 and Demodulator 1 of this remote site s CDD 880 Expansion Unit is already involved in a mesh with R1 Remote 1 4 Define your filtering rules The VMS dyna...

Page 191: ...the Hub site CDD 880 demodulator that is tuned to the remote site originating the mesh The intent of this filter rule is to block any packets originating from R1 that are destined to R2 This prevents...

Page 192: ...es the user defined value the CDM 840 then sends a switch request to the VMS requesting the user defined bandwidth The switch request also contains the address that the ToS stamped packet was destined...

Page 193: ...X X X X X X X X X CDM 850 SLM 5650A 155 X X X X X X X X X CDD 562L 9 98 X X X X X X X X X X X CDD 564 CDD 564L 9 98 X X X X X X X X X X X CDD 880 15 35 X X X X X X X X X X X CDD 890 Standalone or as...

Page 194: ...CDD 880 Multi Receiver Router MN CDD880 Appendix F Revision 2 F 12 Notes...

Page 195: ...le terminals with sufficient RF power could increase their transmit power during rain loss conditions to compensate for the loss and maintain the PEB on the satellite However rain fade may occur at th...

Page 196: ...2 1 About DPC DPC is a selectable software feature operating independently on CDM 840s exchanging a UDP message between the receiving unit where the signal quality is being measured and the transmitt...

Page 197: ...DPC relies on basic fundamental settings before it can operate properly These parameters build the foundation on which the control can reference all power variations One significant but often overloo...

Page 198: ...hen operating the network in dSCPC as the system varies symbol rate and power For more information on CDM 840 commissioning and cabling considerations see Comtech EF Data Quick Reference Document QR C...

Page 199: ...t modifying maximum power set points G 2 2 2 3 Rated Maximum Power Per Figure G 1 Line 2 the blue line indicates the breakpoint of rated maximum power given by the link budget parameters of maximum da...

Page 200: ...CDD 880 Multi Receiver Router MN CDD880 Appendix G Revision 2 G 6 Figure G 2 ACM MODCOD Switch Point...

Page 201: ...rminal margin of 5 dB the power control algorithm would re adjust as the fade clears leaving a 6 dB power delta but the overall terminal margin is not affected still providing fade increase of up to 1...

Page 202: ...generated for each individual demodulator available within the unit sending signal quality ES N0 value to its corresponding CDM 840 Messages are sent on timed intervals 60 seconds normally or 0 5 seco...

Page 203: ...d on last reported LQRM with configured conditions The control loop is a constant handshake requiring certain conditions to be met before modifying power The CDD 880 is assigned the Management IP Addr...

Page 204: ...ES N0 Target target window 5 dB CDM 840 Power Adjustment Timers CDM 840 timers are dependent on receipt or loss of LQRM o Targeting Power adjustment ratcheted steps 3 dB every 100 ms steps 1 dB 1 dB t...

Page 205: ...hart of the LQRM and Power Management Send and Adjust Logic Figure G 4 LQRM Power Management Flow Diagram G 3 2 DPC with ACM DPC and ACM function independent of one another whereby power is modified f...

Page 206: ...remotes on timed intervals The UA message that is generated and sent by the CTOG 250 contains an attenuation value and other network routing information This attenuation value is a number is from 0 to...

Page 207: ...nd rated maximum power and up to backoff power possibly preventing degraded performance by not modifying MODCOD under ACM control The Figure G 7 graph depicts DPC with hub backoff As C N decreases out...

Page 208: ...al backoff value from terminal maximum An alternate method is a collaborative approach whereby outbound ACM remote LQRMs are collected at the corresponding CTOG 250 and stored in a table that is perio...

Page 209: ...al Chapter 7 SERIAL BASED REMOTE PRODUCT MANAGEMENT in this manual Chapter 6 ETHERNET BASED REMOTE PRODUCT MANAGEMENT and Chapter 7 SERIAL BASED REMOTE PRODUCT MANAGEMENT in the CDM 840 or ODM 840 Ins...

Page 210: ...THE CDD 880 WITH THE LATEST VERSION FIRMWARE FILES YOU HAVE CONNECTED THE CDD 880 TO A USER SUPPLIED WINDOWS BASED PC AS FOLLOWS O THE PC SERIAL PORT IS CONNECTED TO THE CDD 880 REAR PANEL CONSOLE POR...

Page 211: ...880 Multi Receiver Router MN CDD880 Appendix G Revision 2 G 17 TOP CDD 880 HTTP Interface BOTTOM CDM 840 HTTP Interface Figure G 9 HTTP Interfaces Splash Pages and DPC Operation Menu Trees FW Ver 1 6...

Page 212: ...you set this address and click Submit the CDD 880 begins to send LQRMs 2 In the Tx Dynamic Power Control DPC Configuration section of the CDM 840 HTTP Interface Configuration WAN Mod DPC page use you...

Page 213: ...t be applied until hub fade detection is available G 4 1 2 Power Reference in DPC Operation Once DPC is configured the power reference setting is vital to the overall operation of DPC The reference se...

Page 214: ...establish the communications link set the Modulator Frequency and select the MODCOD Symbol Rate and Data Rate b Manually adjust the modulator power until the return path demod locks with good data pin...

Page 215: ...is established dynamically use the CDM 840 HTTP Interface to do these steps a Use the Configure ECM page to enable ECM with correct TAP parameters b Either manually set ECM Power or enable Power Hunt...

Page 216: ...rence section of the Configuration WAN Mod DPC page click Set Reference f If Set Reference fails note the failure correct the condition and click Set Reference once more G 4 1 4 DPC Status Reporting O...

Page 217: ...output Time since last LQRM This is the time in seconds from the last power report received Under normal conditions the status updates every 60 seconds G 4 2 DPC Operational Changes DPC operation modi...

Page 218: ...remain the same until reference calibration in the CDM 840 is applied meaning that system will operate normally G 6 Considerations DPC is not an accurate system or absolute solution As fading varies w...

Page 219: ...This maximizes each remote s throughput under all conditions which in turn maximizes network efficiency and availability Advanced VSAT supports ACM in the forward direction Outbound ACM as well as the...

Page 220: ...rate bit rate 0 666 Re arranging Bit rate symbol rate modulation order code rate So in changing to a higher modulation order or code rate the bit rate is increased and in changing to a lower modulati...

Page 221: ...Table H 1 The VersaFEC MODCOD set Modulation MODCOD No Code Rate Spectral Efficiency bps Hz Block Size kbits Typical Es No for BER 5 x 10 8 Typical Eb No for BER 5 x 10 8 dB Latency at 64 kbps in mil...

Page 222: ...or this ACM scheme is 34 milliseconds Table H 2 Example Case VersaFEC Implementation of ACM 100 ksymbols sec Modulation MODCOD No Code Rate Spectral Efficiency bps Hz Bit Rate Throughput in kbps Minim...

Page 223: ...D SNMP INTERFACES AND THE SERIAL BASED REMOTE CONTROL INTERFACES FOR ADVANCED USERS ONLY COMTECH EF DATA STRONGLY ENCOURAGES USE OF THE PERTINENT HTTP INTERFACES FOR MONITOR AND CONTROL M C OF ADVANCE...

Page 224: ...nfiguration and BERT operations Figure H 3 shows the CDM 840 HTTP Interface splash page and the menu tree for accessing VersaFEC ACM and BERT operations Page functionality that is not specific to the...

Page 225: ...CDD 880 Multi Receiver Router MN CDD880 Appendix H Revision 2 H 7 Figure H 3 CDM 840 HTTP Interface and Menu Tree VersaFEC ACM BERT Operations FW Ver 1 6 2 X...

Page 226: ...on Network Routing page as needed to configure add a route from the CDD 880 to the CTOG 250 for the Management IP Address of the CDM 840 Be sure to click Submit on each page as needed to save your set...

Page 227: ...Enable ACM Click Submit to save your settings Figure H 5 CDM 840 HTTP Interface Configuration WAN Mod ACM Page H 4 2 Troubleshooting Referring to the CDM 840 HTTP Interface Configuration WAN Mod ACM p...

Page 228: ...nges in order to maintain the link Alternately if you have access to an Oscilloscope in X Y mode the ALARMS connectors located on the rear panel of the CDD 880 or the CDM 840 provide analog voltages t...

Page 229: ...d the ACM controller responding by lowering the MODCOD See Section H 6 Notes and Recommendations H 5 ACM Congestion Control When the ACM controller switches from a lower to a higher MODCOD the bandwid...

Page 230: ...SNR instantaneously drops to 0 dB the demod will lose lock and the system will recover by switching to MODCOD 00 if so configured in VersaFEC To achieve the most robust link performance Comtech EF Da...

Page 231: ...onditions and every 30 seconds when the measured Es No is stable Configurable Parameters Maximum MODCOD MODCOD 00 through MODCOD 11 Target Es No margin 0 0 to 4 5 dB 0 5 dB steps System Latency 34 mil...

Page 232: ...CDD 880 Multi Receiver Router MN CDD880 Appendix H Revision 2 H 14 Notes...

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Page 234: ...2114 WEST 7TH STREET TEMPE ARIZONA 85281 USA 480 333 2200 PHONE 480 333 2161 FAX...

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