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1 INTRODUCTION

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Содержание OM 2000

Страница 1: ...INSTALLATION OPERATION MANUAL OM 2000 Out of Band Modulator Software Version 1 0 x Replaces 539808 001 c ...

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Страница 3: ...ny selector switches Different types of line cord sets may be used for connections to the mains supply circuit and should comply with the electrical code requirements of the country of use This equipment requires a grounding conductor in the line cord WARNING TO PREVENT FIRE OR SHOCK HAZARD DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE THE APPARATUS SHALL NOT BE EXPOSED TO DRIPPING OR SPLASHING...

Страница 4: ...wn expense Any changes or modifications not expressly approved by Motorola could void the user s authority to operate this equipment under the rules and regulations of the FCC CANADIAN COMPLIANCE This Class A digital apparatus complies with Canadian ICES 003 Cet appareil numérique de la classe A est conforme à la norme NMB 003 du Canada International Declaration of Conformity We Motorola Inc 101 T...

Страница 5: ...Sun Java and all other Java based marks are trademarks or registered trademarks of Sun Microsystems Inc in the U S and other countries Netscape Navigator is a registered trademark of Netscape Communications Corporation UNIX is a registered trademark of The Open Group Linux is a registered trademark of Linus Torvalds Infineon Technologies is a trademark of Infineon Technologies AG Finisar is a trad...

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Страница 7: ...rface Cables 19 Connecting Ethernet and Modulator Output Cables 19 Connecting Optional Serial Port Cables 20 Connecting the Optional Ground 20 Connecting Emergency Alert Wiring 20 OM 2000 Power Connection to AC Power 21 OM 2000 Power Connection to DC Power 21 Confirming Correct Installation 22 4 Setup and Operation 23 Network Connection 23 Verifying the Network Connection 23 OM EM Requirements 23 ...

Страница 8: ...ons 50 Performance Specifications 50 Interconnection Specifications 51 Data Bit Rate 51 Appendix B Cabling Specifications 53 RS 232 DB9 Interface Cabling 53 DB25 RS 530 Interface Cabling 54 Ethernet 10 100 Base T Interface Cabling 55 Appendix C Initialization Information 57 Self Boot Initialization 57 External Initialization from a LAN Resident BOOTP Server 57 BOOTP Request and Reply Format 58 Typ...

Страница 9: ...on 20 Figure 3 3 Emergency alert connection 21 Figure 4 1 Initiating an OM EM Session 25 Figure 4 2 File download pop up 25 Figure 4 3 OM Element Manager Login window 26 Figure 4 4 Incorrect Password error popup 26 Figure 4 5 OM 2000 Alarms window 27 Figure 4 6 OM EM Main window 28 Figure 4 7 System drop down menu root user logged in 29 Figure 4 8 System drop down menu non root user logged in 30 F...

Страница 10: ...28 Table 4 3 Administration window option field definitions 31 Table 4 4 System Time window field definitions 36 Table 4 5 Ethernet window field definitions 39 Table 4 6 OM Element Manager Status Drop down List Definitions 40 Table 4 7 Alarms window field definitions 41 Table 4 8 Events window field definitions 42 Table 5 1 LED status indicators 45 Table 5 2 Common fault indications 46 Table 5 3 M...

Страница 11: ...dulator The OM 2000 Receives Ethernet User Datagram Protocol UDP packets from a controlling processor Multiplexes downstream data from multiple sources Provides forward error correction FEC encoding of the bitstream as well as interleaving and randomization Provides downstream QPSK modulated output within the 71 to 129 MHz range Provides industry standard Ethernet 10Base T connectivity for operati...

Страница 12: ...intenance information Appendix A Specifications provides the technical specifications for the OM 2000 Appendix B Cabling Specifications provides the cabling specifications for the OM 2000 Appendix C Initialization Information provides special information on the OM 2000 initialization process Appendix D Fan Field Replacement Procedure provides instructions to replace a malfunctioning OM 2000 fan Gl...

Страница 13: ...e Indicates a field menu or button you must select on a graphical user interface GUI Courier font Indicates text displayed on a GUI such as system messages ALL CAPS Denotes silk screening on the equipment typically representing front and rear panel controls and input output I O connections and LEDs KEY KEY Key combinations indicating that you hold down the first key and press the second key KEY KE...

Страница 14: ...7 725 4011 Motorola Online http businessonline motorola com The TRC is on call 24 hours a day 7 days a week In addition Motorola Online offers a searchable solutions database technical documentation and low priority issue creation and tracking For specific toll free numbers when calling from outside the United States please refer to your product manual or our Web page ...

Страница 15: ...ccess code then 52 631 311 1100 to contact the Repair Facility The Repair Facility is open from 7 00 AM to 4 00 PM Pacific Time Monday through Friday The RSA number must be prominently displayed on all equipment cartons When shipping equipment for repair 1 Pack the unit securely 2 Complete and enclose the checklist provided with the unit 3 Enclose a copy of the invoice that verifies the warranty s...

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Страница 17: ...rmation Application code downloads Control messages for emergency situations Data services Executable code downloads to fix or upgrade cable terminal operation Other devices in the headend create the specific commands messages and downloadable code that make up the information contained in the OOB datastream The OM 2000 accepts this information and processes it for delivery on the OOB channel by c...

Страница 18: ...into the OOB data transmission OOB Signal Processing In converting the OOB data inputs into an RF signal the OM 2000 performs the following OOB signal processing functions Receives the cable terminal control stream and other OOB data from multiple input sources Multiplexes the information into a single packet based MPEG 2 compliant transport stream Inserts PID 0 and PID 1 control streams into the ...

Страница 19: ...ms an RS 232 port is configured to receive cable terminal control stream information instead of or in conjunction with the Ethernet port Ethernet 1 3 The standard Ethernet port is the primary input to the OM 2000 Because it is an Ethernet connection port 3 supports communication with multiple devices over the same physical port Generator port GEN The MPEG message generator is a virtual input only ...

Страница 20: ... uses QPSK modulation to convert an MPEG 2 compliant transport multiplex into a 1 8 MHz wide RF signal with a center frequency between 1 and 129 MHz Data directed to this destination is output from the RF Out and IF Out connectors on the OM 2000 back panel Serial data ports Data directed to a serial data port is output as a serial datastream The serial data ports are valid destinations only when c...

Страница 21: ...ackets from each buffer in the RF modulator queue in sequence that is one packet from the A buffer one from the B buffer one from the C buffer and so on The input devices supplying the data control the PID numbers assigned to incoming packet streams As a result it is possible that packet streams received from two different devices may use the same PID number To avoid collision of these packets whe...

Страница 22: ... into a synthesized analog waveform The waveform is a 1 8 MHz wide signal with a carrier frequency centered at 44 MHz IF Frequency upconversion A frequency agile converter processes the QPSK modulated 44 MHz IF signal to an RF output frequency configurable from 71 through 129 MHz Figure 2 4 shows a block diagram of the RF modulator Figure 2 4 RF modulator block diagram Generating Serial Data Outpu...

Страница 23: ...cal inches Figure 2 5 illustrates the OM 2000 and its physical dimension Figure 2 5 OM 2000 dimensions Refer to Appendix A Specifications for complete physical electrical and environmental specifications Indicators and Connectors The OM 2000 indicators as well as the RF monitor jack are located on the front panel Figure 2 6 illustrates the front panel indicators Figure 2 6 OM 2000 front panel ...

Страница 24: ...e tasks After the OM has completed booting the Status Summary Alarm indicator illuminates for the following conditions Solid Green power on and no faults Solid Yellow indicates a minor or warning alarm has occurred Solid Red indicates a critical or major alarm has occurred 3 Indicates when data arrives from the cable network 4 RF and IF Output indicators each illuminates to indicate data activity ...

Страница 25: ...OM 2000 rear panel input output connectors power connector and fans Figure 2 7 Rear panel Table 2 4 identifies each connector and describes its function Table 2 4 OM 2000 input output and power connections Key Connector Description 1 The AC power input connector accepts inputs from 100 through 240 V AC 50 through 60 Hz 1 The DC power input connector accepts inputs from 40 through 60 V DC 2 5 Two f...

Страница 26: ...alert system circuitry This circuitry enables civil authorities to deliver emergency warnings to cable subscribers The screw terminal labeled GND connects to signal ground The screw terminal labeled connects to the positive side of an emergency alert remote control unit 7 DB25 RS530 This port operates in either an asynchronous or synchronous mode and provides higher transparent MPEG data input out...

Страница 27: ...e OM 2000 shipment Item Quantity Description OM 2000 chassis 1 Cabinet to house the RF modulator and related equipment Mounting screws 10 32 0 5 inches long Phillips round with plastic washer 4 Provided to mount front of unit in the rack As applicable AC cord 3 conductor 7 feet 6 inches 18AWG Or DC cord 3 conductor 15 feet 14 AWG 1 Power cord for unit 2 The following items that are not included wi...

Страница 28: ...o OM 2000 for HITSQT PN 523807 002 00 RS530 Cable type 2 Standard RS530 PN 471372 003 00 4 Brace the unit with optional rear supports for improved stability when mounting the OM 2000 into the equipment rack Mounting the OM 2000 Mount the OM 2000 in a standard 19 inch rack If the equipment operates continuously in a closed cabinet use forced air circulation to ensure maximum equipment life and opti...

Страница 29: ...wer cord is disconnected before connecting any I O cables Connecting Ethernet and Modulator Output Cables For most applications the RF modulator must be connected to the distribution system Figure 3 1 illustrates a typical connection for Ethernet and modulator output In the illustration the IF output is connected to a C6U however other upconverters can be used Figure 3 1 OM 2000 Ethernet and modul...

Страница 30: ...unit and then tighten the screws 7 Repeat steps 4 through 6 for the female connector marked opt2 Connecting the Optional Ground Connect a ground wire from the OM 2000 to the rack frame using a 10 32 screw Connecting Emergency Alert Wiring The OM 2000 emergency alert function may not operate reliably if an excessive voltage differential exists between the remote control unit chassis and the OM 2000...

Страница 31: ...the AC power cord after all I O connections are complete The power supply automatically senses and adapts to any input from 100 through 240 V AC at 50 through 60 Hz Caution To prevent electrical shock do not use the polarized power cord with an extension cord receptacle or other outlet unless all blades can be fully inserted to prevent blade exposure OM 2000 Power Connection to DC Power For DC uni...

Страница 32: ...minal bar or bus to which the dc supply system earthing electrode conductor is connected 2 This equipment shall be located in the same immediate area such as adjacent cabinets as any other equipment that has a connection between the earthed conductor of the same dc supply circuit and the earthing conductor and also the point of earthing of the dc system The dc system shall not be earthed elsewhere...

Страница 33: ...server The particular method used to set up initial operation depends on the system configuration After setting the initial operating configuration modify the configuration by Sending commands from an SNMP network manager such as the OM EM or SDM Forcing a reboot to download a new configuration to the OM from the BOOTP server The OM only processes BOOTP responses from the OAM P interface ENET1 MAC...

Страница 34: ...essor and the greater the memory the faster the OM EM will respond Systems with more than 512 MB and or more memory are highly recommended Also the larger the display window and or the higher the resolution the better the OM EM display clarity Table 4 1 Memory Specifications Item Minimum Specification Recommended Specification PC Processor 300 MHz Pentium II P4 1 0 GHz RAM 128 MB 512 MB Disk free ...

Страница 35: ...ears as shown in Figure 4 2 Figure 4 2 File download pop up 3 Click SavethisfiletoDisk and click OK Note that the name of the OM EM file omem jar can be changed to denote a specific OM or OM version for example omem10 jar However the file extension must be jar 4 To launch the OM EM after the application downloads either double click the downloaded omem jar recommended or access MS DOS and at the c...

Страница 36: ...d is the default 7 Type the OM IP address or select an OM from the drop down list The drop down list contains the most recently accessed OMs 8 Click OK If an incorrect password or user name was entered an error popup displays as shown in Figure 4 4 Figure 4 4 Incorrect Password error popup If there is an active warning yellow major alarm magenta or critical OM Unit Alarm red the Alarms window disp...

Страница 37: ...000 Alarms window If the OM does not have an active OM Unit Alarm the OM EM Main window is displayed as shown in Figure 4 6 The drop down lists for each of the menu bar selections are shown in Figure 4 7 Figure 4 8 Figure 4 14 and Figure 4 19 ...

Страница 38: ...pplication Configuration provides screen sets to configure OM parameters for the system Status provides the capability to view any of the status reports and to save all of them to a text file Windows within a majority of the screen sets are tab selected Each window has operating buttons that appear at the bottom right Table 4 2 OM EM Software Toolset Button Functionality Button Function State Clos...

Страница 39: ...al value Always enabled Submit Saves writes user name and password changes to the OM Always enabled System When logged in as root clicking System on the OM EM menu bar displays the drop down list as illustrated in Figure 4 7 Figure 4 7 System drop down menu root user logged in When logged in as a user other than root clicking System on the OM EM menu bar displays the drop down list as illustrated ...

Страница 40: ...u can invoke windows to Reboot the OM Manage user names and passwords Display current OM revision level information Exit the OM EM These activities are described in the following subsections Reboot The OM 2000 Reboot pop up is illustrated in Figure 4 9 Figure 4 9 OM 2000 Reboot pop up Click Yes to reboot the OM 2000 ...

Страница 41: ...tional user has been added this user name will be displayed as well Remove User Deletes the selected user name from the OM EM User root cannot be removed Set Password Opens the Set Password window which allows the user to change the current password The Set Password window is illustrated in Figure 4 11 below Password Expiration Check Enabled If enabled the OM EM will check for password expiration ...

Страница 42: ... password to be changed Consistent with standard software procedures changing requires entering the current user name or password followed by the new one A password change requires the new password to be entered twice before clicking Submit Figure 4 11 Set Password window About The About popup is illustrated in Figure 4 12 Figure 4 12 About popup Click OK to acknowledge and remove the pop up ...

Страница 43: ... No to remove the popup Configuration Clicking Configuration on the OM EM menu bar displays the drop down list as illustrated in Figure 4 14 Figure 4 14 Configuration drop down list The OM 2000 Configuration screen sets described below include Physical Interface Configuration Logical Ports Configuration Network Configuration ...

Страница 44: ... settings The console port provides asynchronous communications at a 9600 baud data rate It is used only for maintenance 2 RS232 DB 9 This option configures the operating parameters for this physical port This port is configured for asynchronous communications and the data rate is configured between 300 and 19 2 Kbps 3 Ethernet There are no configurable parameters for this physical port An informa...

Страница 45: ... value of 40 is 50 dBmV 8 CW Test and Con Test are test modes These modes are documented in the section titled Testing the RF Modulator 9 Rev Test mode causes a spectral inversion of both signals 10 PID Generator MPEG Message Generator port option 11 Not used Logical Ports Configuration The OM 2000 supports up to 16 logical ports designated ports 1 through 16 At least one logical port must be an i...

Страница 46: ... interface is used as an output Log Port State Use Unlocked only Source UDP Port Only used for Ethernet interface Multicast IP Address Only used for Ethernet input interface Up to four Multicast IP addresses can be received per logical port Output Destination IP IP address of where the output stream goes Can be a singlecast or multicast IP address MPEG UDP Packing Defines the number of MPEG packet...

Страница 47: ... ports and to re map PIDs to other values If a PID value is entered in the Input PID column and no other columns are filled in the PID stream will be dropped If a PID value is entered in the Input PID column and a PID value potentially a different value is entered into the Output PID column the PID stream will be remapped to the Output PID value In this case at least one destination port must be f...

Страница 48: ...y the host default gateway It provides the ability to view the MAC address of ENET1 as well as the ability to define the IP Address and Subnet Mask if applicable for this Ethernet port The Ethernet window is illustrated in Figure 4 18 and defined in Table 4 5 Figure 4 18 Network Configuration window ...

Страница 49: ...ce file Trap Receiver IP IP Address of where to send SNMP Traps EA Port The logical input port number that is used for EAS processing Incoming PIDs that match the list below will be dropped and EAS information will be inserted EA PID 1 HEX PID that is blocked when EAS is activated EA PID 2 Hex PID that is blocked when EAS is activated EA PID 3 Hex PID that is blocked when EAS is activated EA PID 4...

Страница 50: ...e Entire OM Status Causes the OM EM to gather and store MIB information Status Alarms This window represents a software panel of monitored conditions in the OM Although not applicable to all alarm conditions the six status levels are OK green Indeterminate gray Warning yellow Minor alarm blue Major alarm magenta and Critical alarm red Warning Minor and Major alarms do not prevent the OM from perfo...

Страница 51: ...hreshold has been reached The MCC threshold is the number of occurrences of MPEG messages that came in out of order or missed all together per minute This alarm helps identify the error condition where two RADDs are sending MPEG PID streams to the same OM Duplicate UDP Ports Displays the number of duplicate UDP ports in use This is an error condition Invalid Mulitcast IPs Displays the number of in...

Страница 52: ... defined in Table 4 8 Figure 4 21 Events window Table 4 8 Events window field definitions Status Serial Number Display of Serial Number This is set in the factory Inventory Code User configurable Hardware Versions Hardware Features Application Version Indicates the Application Code version Boot Code Version Agent Version Displays the SNMP Agent version in the Application Code ...

Страница 53: ... Save Entire OM Status The Save Entire OM Status interface saves all of the status to a status txt file which is located in the same directory as the omem jar file The Save Entire OM Status window is illustrated in Figure 4 22 Figure 4 22 OM Status Upon successful completion a pop up appears stating Save OM Status completed see Figure 4 23 Figure 4 23 Save OM Status window ...

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Страница 55: ...d in quickly resolving problems you may encounter using the OM 2000 Table 5 1 describes the operating conditions indicated by the fault LEDs on the front panel Table 5 2 lists common error conditions symptoms possible causes and corrective actions for common OM 2000 error conditions Table 5 3 lists and describes the RF modulator port testing modes Table 5 1 LED status indicators Indicator Descript...

Страница 56: ...el display Commit and then save the changes Reboot the system Changes are being overwritten by the OM2000 ini file The OM2000 ini file is being force downloaded as set within the OM2000 fof file See Section 4 Setup and Operation for steps on saving the settings No serial port communications available Port not enabled Adjust the port settings to match the settings in the headend equipment The data ...

Страница 57: ...gnal The signal frequency is exactly the same as the center frequency of the QPSK modulated signal The signal level is equal to the composite level of the QPSK signal This mode is useful for exact frequency measurements but should not be used for power leveling CON test The RF modulator operates the same as in the Operate mode except that the digital FIR filter coefficients are changed In the Oper...

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Страница 59: ... to 50 dBmV configurable Level step size 0 5 dB Spurious outputs 60 dBc minimum IF Output Center frequency 44 MHz Level 26 dBmV nominal factory set AC Electrical Specifications Voltage AC 100 through 240 V ac Line frequency AC 50 through 60 Hz Line current AC 0 6 0 3 A 120 V Power 56 W maximum 48 W typical DC Electrical Specifications Voltage DC 40 60 V dc Nominal 48 V dc Power 56 W maximum 48 W t...

Страница 60: ...0 C to 70 C Cooling 2 Fans Physical Specifications Dimensions 1 75 H X 19 W X 18 D inches Weight 10 lbs Mounting Rack mount Performance Specifications RF output level stability vs temperature 2 dB Accuracy of RF center frequency 15 ppm Accuracy of IF center frequency 0 005 Forward error correction Reed Solomon 96 94 FEC interleaving Convolutional I 8 I 12 MER 30 db Unequalized ...

Страница 61: ...4800 9600 19200 The RS 232 port does not support synchronous communication There is no flow control with this port The RS 530 port supports asynchronous communications with the following baud rates 300 600 1200 2400 4800 9600 19200 38400 and 57600 There is no flow control with this port The RS 530 port also supports synchronous communication with data rates between 50000 bps and 2005000 bps There ...

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Страница 63: ... Connector Pinout Pin Number Signal Direction Description 1 RLSD DCD In Receive Line Signal Detector Data Carrier Detect 2 RX In Receive data 3 TX Out Transmit data 4 DTR Out Data Terminal Ready 5 SG Shield Signal Ground Shield 6 DSR In Data Set Ready 7 RTS Out Request To Send 8 CTS In Clear To Send 9 RI In Ring Indicator The OM 2000 can either source or sink the transmit clock This is a configura...

Страница 64: ...6 K maximum async 2 Mbps sync Async 300 600 1200 2400 4800 9600 19200 38400 or 57600 bps Sync 50000 through 2005000 bps Refer to Appendix A Specifications Table B 2 DB25 RS 530 interface connector pinout Pin Number Signal Direction Description 1 SHIELD Shield Chassis ground 2 BA Out Transmit data 3 BB In Receive data 4 CA Out Request to send 5 CB In Clear to send 6 CC In DCE ready 7 AB Ground Chas...

Страница 65: ...lock is needed when sending data through a modem through a network T1 line In this case the modem sources a clock that is locked to the network The OM 2000 syncs the clock and sources data to the modem to be sent to the network Ethernet 10 100 Base T Interface Cabling Connector type RJ 45 connector Cable type STP 5 category 5 shielded twisted pair Maximum cable length 150 feet Table B 3 Ethernet 1...

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Страница 67: ...ot initialization occurs when the OM times out waiting for a reply and then initializes itself from the information stored in its non volatile memory External Initialization from a LAN Resident BOOTP Server For external initialization to occur from a BOOTP server The OM must be connected to the system Ethernet LAN on ENET1 A BOOTP or DHCP server must be present on the LAN The BOOTP or DHCP server ...

Страница 68: ... for specifying basic BOOTP message information including Message type request or reply MAC address of requesting device IP address assignment of requesting device Boot file name for the requesting device Values for some standard fields must be specified and others are optional depending on whether the BOOTP message is a request or reply Vendor Specific Area Contains fields for use as defined by t...

Страница 69: ... ini Contains OM configuration settings for application firmware Fec_fpga_v01 rbf Field programming gate array personality file for FEC FPGA OMem jar Executable OM EM Java based application OM2000 HST Example Hosts File OM2000 SVC Example Services File OM2000 GTW Example Gateways File OM2000 HTM HTML File used by internal HTTP Server Reference Specifications To support TFTP and BOOTP the OM confor...

Страница 70: ...t Gateway Name BOOTDIR BOOTFILE IPADDR MACADDR SUB NET Mask GATEWAY Type FILE BOOTFILE IPADDR MACADDR IPADDR IPADDR Data Source Local Value Local Value Local Value Local Value Local Value Local Value Value BOOTDIR OM2000 01_00 001 OM2000 fof Description Optional Optional Optional Optional Optional Optional Write to BOOTPVSA Checked Checked graytone Checked Unchecked Checked Unchecke d Tag Hd N A b...

Страница 71: ...ose blade is not turning on the rear panel of the OM A failing fan blade does not turn whereas a marginal fan may have a rasping sound that is definitely a pitch off and also surges in volume from the steady hum of other fans In a rack of OMs it is worthwhile identifying any marginal fans to ensure adequate spares are available 2 Remove the four hex nuts and washers securing the fan cover to the f...

Страница 72: ...erly aligned with the connector and slide it onto the four stand offs The fan blades should face toward the OM the rear of the fan motor should face away from the OM 2 Connect the fan power cable to the connector 3 Slide the fan cover over the body The four stand offs should pass through holes on the fan cover 4 Secure the fan cover in place with the four washers and hex nuts 5 Ensure the replacem...

Страница 73: ...ll modem cable that swaps transmit and receive Establishing Communication with a PC To initiate a port session with the OM 1 On the PC connected to the OM open a terminal emulation program for example HyperTerminal 2 Display the Communications Port window and select the following values Bits per second 9600 Data bits 8 Parity None Stop bits 1 Flow control None 3 Click OK to close the window 4 Pres...

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Страница 75: ...Interface DQPSK Digital Quadrature Phase Shift Keying DTE Data Terminal Equipment EPG Electronic Program Guide ESD Electrostatic Discharge FEC Forward Error Correction FIR Finite Impulse Response FOF File Of Files HCT 1000 Headend Configuration Tool 1000 IEC International Electrotechnical Commission IF Intermediate Frequency I O Input Output IP Internet Protocol IPPV Impulse Pay Per View IRT Integ...

Страница 76: ...y NVRAM Non Volatile Random Access Memory OAM P Operation Administration Maintenance and Provisioning Ethernet port OBTM Out of Band Transport Multiplex receiver OM 2000 Out of band Modulator 2000 OOB Out Of Band PID Packet Identifier PLL Phase Locked Loop QPSK Quadrature Phase Shift Keying RF Radio Frequency RMS rms Root Mean Square RSA Return For Service Authorization SNMP Simple Network Managem...

Страница 77: ...of all EMM streams in a transport multiplex and indexes each EMM stream to an EMM provider ID DAC 6000 Motorola Digital Addressable Controller 6000 used for controlling digital cable terminals and digital wireless terminals The name was changed from ACC 4000D in late 1997 Forward Error Correction FEC An encoding technique applied to data before transmission to reduce the number of errors introduce...

Страница 78: ...l and is used to describe the mechanisms used to arbitrate access to a shared medium MPEG 2 MPEG II An international standard ISO IEC 13818 for delivering compressed digital video MPEG 2 broadcast quality is 704x480 pixels at 30 frames per second fps in North America and 704x576 pixels at 25 fps in Europe MPEG 2 is typically compressed at higher than 5 Mbs and intended for higher quality broadcast...

Страница 79: ...s out of phase in quadrature resulting in four possible phase states Reed Solomon encoder A block based encoding technique used for forward error correction User Datagram Protocol UDP A transmission protocol that uses an IP address to identify the destination host and a port number to identify the destination application ...

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Страница 81: ...Motorola Inc 101 Tournament Drive Horsham PA 19044 U S A http www motorola com 539808 001 d 03 09 ...

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