Black Box MWU2000-1212 User Manual Download Page 52

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2.048Mbps Wireless Modem

SALES: 0118 965 5100

When an alarm is detected, a note appears at the bottom of the display

(Note: An alarm

has been activate

d) and the message:

ALARM EXISTS

is displayed on the menu

header (see Figure 3-1). In addition, the TEST LED will blink.

Fractional T1 Parameters Menu

Summary of Contents for MWU2000-1212

Page 1: ...asingstoke Road Reading Berkshire RG2 0QN www blackbox co uk 2 048Mbps Wireless Modem G703 MWU2000 G703 X 21 MWU2000 X21 V 35 MWU2000 V35 Directional Antennas with 10 m of cable 12dBi Transmit 12dBi R...

Page 2: ...blackbox deutschland com Web Site www blackbox com br Switzerland Canada Datacom Black Box Services AG Black Box Canada Corp Tel 0554517070 Tel 0416 736 8000 Fax 0554517075 Fax 0416 736 7348 Web Site...

Page 3: ...on Tel 0145606700 Tel 724 746 5500 Fax 0145606747 Fax 724 746 0746 Web Site www blackbox fr Web Site www blackbox com Spain Chile Black Box Comunicaciones S A Black Box Chile Tel 34 91 663 0200 Tel 00...

Page 4: ...17 Installation Antennas and Accessories 18 Package Components 18 Installing the 2 048Mbps Wireless Modem 18 General 18 To Configure the Unit as Master 19 To Configure Channels Fractional E1 20 To Co...

Page 5: ...rsus Time 74 Set Time Tracer Resolution 75 Reset Counters 76 Clear Reset Counter 76 Watch Alarms 77 Mode and Access Control Menu 82 Change Access Rights 82 Site Survey Mode 82 System Reset Menu 83 Tro...

Page 6: ...30 X 21 Standards 108 Configuration Options 108 2 048Mbps Wireless Modem Standard Configuration 109 Connecting your 2 048Mbps Wireless Modem to another modem 110 RS 530 V 35 X 21 Back to Back Configur...

Page 7: ...stalling Other Types of Receive Amplifiers 128 General 128 Appendix E Pin Assignments 130 E1 T1 and Fractional E1 T1 Pin Connections 130 LIU RS 530 Connector Pin Assignments 130 LIU D 25 to V 35 Cable...

Page 8: ...cations of the 2 048Mbps Wireless Modem and accessories Appendix A V 35 RS 530 X 21 Applications contains a description of possible configurations when connecting V 35 RS 530 X 21 end equipment to the...

Page 9: ...dependable communication link even in bad line of sight conditions The compact dimensions of the 2 048Mbps Wireless Modem permit easy installation The unit is housed in a 1U half 19 enclosure for sim...

Page 10: ...arently to data protocols Fractional E1 T1 applications with voice channels are supported by a special line interface unit incorporating a built in echo canceller for improved voice quality Error Free...

Page 11: ...veral optional types of antennas cables and RF accessories are provided allowing selection of the RF components best suited for different applications 2 048Mbps Wireless Modem Benefits Provides a cost...

Page 12: ...e connectors mounted on the rear panel of the unit The 2 048Mbps Wireless Modem can be ordered with the following optional Line Interfaces RS530 The rear panel connection is made with a D Type 25 pins...

Page 13: ...ctional T1 With Echo Cancellation The rear panel connector module consists of one T1 DSX 1 balanced RJ 45 connector Figure 1 6 2 048Mbps Wireless Modem Rear Panel T1 LIU and Fractional T1 LIU Refer to...

Page 14: ...d the frequency band are determined by the specific model and relevant local regulations Frequency hopping provides reliable communication at low bit error rates as well as increased bandwidth and int...

Page 15: ...PWR On Off Green lamp lights when power supply is connected If lamp fails to light check the power cable and connectors Test System self test Green LED should light all the time after power supply is...

Page 16: ...eceiving link active TX Sync Green LED lights indicating radio transmission link active After power on of the 2 048Mbps Wireless Modem configured as Master the unit immediately starts transmitting At...

Page 17: ...18 931 2233 2 048Mbps Wireless Modem Connectors Figure 1 8 shows how to connect the 2 048Mbps Wireless Modem to its antennas the power supply and to external equipment Figure 1 8 2 048Mbps Wireless Mo...

Page 18: ...ocated indoors and positioned as close as possible to the antennas 2 Connect the unit to the end equipment If the data interface on the DTE is either V 35 or X 21 a cable adapter should be used as fol...

Page 19: ...nels Fractional E1 T1 only Both units must use the same channels Select channels with echo cancellation Fractional E1 T1 with voice channels only Both units must be configured to use echo cancellation...

Page 20: ...ange e g 1 8 11 14 means add channels 1 8 9 10 11 and 14 7 From the Add Remove Channels menu type 2 to select the Remove Channels menu 8 View the current active channels If channels that should not be...

Page 21: ...1 to select the Add Channels menu 6 View the current active channels If channels that should be used are not included enter the numbers of the channels that should be added Enter numbers between 1 to...

Page 22: ...ed parameters to take effect 7 Verify link functionality using the LED indicators See page 15 for LEDs description 8 Further configuration may be done using the setup and configuration functions as de...

Page 23: ...a Showing Installation screws Medium Gain 12dBi Antenna Uni 12 This medium gain antenna has a relatively wide beam width 22 degrees It is intended for both indoor and outdoor installations with medium...

Page 24: ...edium beamwidth 14 degrees which increases the sensitivity to inaccurate alignment but decreases the influence of multipath propagation fading It is intended for outdoor installations over medium to l...

Page 25: ...4 The gain of this antenna is 24dBi It has a narrow beam width 7 5 degrees which increases the sensitivity to alignment inaccuracy but decreases the influence of multipath propagation fading It is int...

Page 26: ...26 2 048Mbps Wireless Modem SALES 0118 965 5100 Figure 2 5 High Gain 24dBi antenna Table 2 1 provides a summary of the main characteristics of the basic medium and high gain antennas...

Page 27: ...rsion transmit antennas The TPA 24 comes in two models TPA 24 LL and TPA 24 LH The TPA 24 LL receives input power in the range of 10dBm to 0dBm The TPA 24 LH receives an input power of 0dBm to 10dBm B...

Page 28: ...as close as possible to the transmitting antenna Figure 2 6 TPA 24 Connections Diagram 2 Set the transmitter DC power supply of the 2 048Mbps Wireless Modem to 12V using the internal jumpers accordin...

Page 29: ...by means of the female RF IN connector Power is obtained through an RG 59 coaxial cable connected to the power supply The LNA 10 incorporates internal lightning and voltage surge protection See page 1...

Page 30: ...thmic values dB Table 2 2 LNA Improvement table For example in a typical installation with a 20 Meter Heliax cable the use of an LNA 10 results in an improvement of 5dB to the total link margin in com...

Page 31: ...estor is used to protect transmitters and receivers from transients originating from lightning or EMP The AL 1 is gas tube based and is not radioactive The gas discharge tube can sustain several trans...

Page 32: ...is cable is thicker heavier and less flexible than the thin cable However its attenuation is less than that of the thin cable Impedance is 50W Outer diameter is 10 8mm 0 425 Low Loss Cable This cable...

Page 33: ...o so may void the Product Warranty and will certainly expose the end user to legal and financial liabilities Black Box are not liable for injury damage or violation of government regulations associate...

Page 34: ...34 2 048Mbps Wireless Modem SALES 0118 965 5100 Figure 2 12 Wall Mount with Azimuth and Elevation Alignment Figure 2 13 One 12dBi Antenna...

Page 35: ...rate higher than the default rate is being used the achievable range should be estimated according to the actual modem rate Note When selecting antennas cables and RF accessories for your specific li...

Page 36: ...s and Tracers menu see Chapter 3 Step 1 Visually Aligning the antennas 1 Loosen the screws on the U bolt that fasten the antenna to the mast or the bolts on the wall mount and slowly move the antenna...

Page 37: ...SSI using a DVM digital voltmeter connected to the RSSI test pin in the rear panel of the unit The measured DC voltage is relative to the RSSI value as indicated in Figure 2 15 The 2 048Mbps Wireless...

Page 38: ...the bolts on the wall mount Figure 2 15 RSSI test point accuracy To fine tune the antenna alignment using a DVM near the receive antenna The modems can be configured send a DC signal through the RCV a...

Page 39: ...nd down elevation and from side to side azimuth until you get a maximum RSSI reading on the DVM 5 Tighten the screws on the U bolt or the bolts on the wall mount Note If you remove the Bias T connecti...

Page 40: ...ocated Modem Units When two or more 2 048Mbps Wireless Modem units are co located you should perform the following procedures in order to allow optimal performance These procedures enable synchronizat...

Page 41: ...antennas of the different units should be located as far from each other as possible and no antenna should be located in the radiating direction of any of the other antennas Step 2 Setting the releva...

Page 42: ...in situations where co located links are added and or deleted frequently Use the following table to determine the maximum number of links to synchronize Table 2 7 Maximum Number Synchronized Links Set...

Page 43: ...ss You can add a new link without interfering with the normal operation of the working link s provided the relevant parameters are properly set as described above Figure 2 21 Connecting Units for Sync...

Page 44: ...by connecting a terminal to the RS232 V 24 monitor interfaces on the rear panel of the 2 048Mbps Wireless Modem The local monitor allows you to access the set up parameters from an ASCII ANSI terminal...

Page 45: ...ol Parameters Radio and Modem Parameters setting Radio and Modem Parameters REMOTE parameters viewing and or setting parameters of the remote unit Load Default Values loading the factory default value...

Page 46: ...n prompt type 1 The Parameters menu appears Figure 3 2 Parameters Menu To make selections using the Parameters menu At the Select Option prompt type the number that corresponds to the option you requi...

Page 47: ...Parameters Menu The LIU Parameters menu gives you access to the following sub menus E1 Parameters Menu select if an E1 LIU is used Fractional E1 Parameters Menu select if a Fractional E1 LIU is used T...

Page 48: ...a equipment AIS Alarm Indication Signal No signal is received by the connected end equipment When an alarm is detected a note appears at the bottom of the display Note An alarm has been activated and...

Page 49: ...ndition following loss of synchronization Bit 3 of TS Time Slot 0 Under normal conditions this bit is always set to 0 Upon identification of an alarm condition it is set to 1 Unframed all ones The tra...

Page 50: ...n of all bits sent to it If the end equipment does not use CRC4 these bits may be used for other purposes and the CRC4 Usage parameter should be set to 0 CRC4 not used If the end equipment uses CRC4 o...

Page 51: ...e TEST LED blinks T1 Parameters Menu Table 3 3 T1 Parameters Menu Items and Actions Pulse Shape The current selection is displayed the NOT DEFINED message is displayed if LIU used is not T1 The select...

Page 52: ...alarm is detected a note appears at the bottom of the display Note An alarm has been activated and the message ALARM EXISTS is displayed on the menu header see Figure 3 1 In addition the TEST LED will...

Page 53: ...53 2 048Mbps Wireless Modem TECHNICAL 0118 931 2233...

Page 54: ...54 2 048Mbps Wireless Modem SALES 0118 965 5100...

Page 55: ...ter to 0 D4 or 1 ESF in accordance with the connected end equipment D4 Yellow Alarm Method Yellow alarm is an indication using the D4 multiframe method that the sending equipment is unsuccessful in sy...

Page 56: ...ed end equipment uses the bit 7 zero suppression method this parameter should be set to 1 Force bit 7 zero suppression Otherwise see also Pulse Density Enforcer below it should be set to 0 no suppress...

Page 57: ...pment Yellow alarm Indication from the connected end equipment that it does not succeed to synchronize with the modem Frame slip Indicates lack of compatibility between the clocks of the modem and the...

Page 58: ...1 Parameter Menu Table 3 5 V 35 RS 530 X 21 Parameters Menu Items and Actions DCE DTE The current selection is displayed or a NOT DEFINED message if a different LIU is used Table 3 6 displays DCE DTE...

Page 59: ...e 3 7 Loopback Mode Menu Items and Actions If you are in loopback mode a loopback is performed on the LIU input and also on the LIU side connected to the modem as described in Figure 3 3 Figure 3 3 Lo...

Page 60: ...to 1 to 2 minutes at the most It is recommended to avoid performing loopback test on the Master unit in Fractional E1 T1 applications or alternatively to switch the master slave definitions of both si...

Page 61: ...unit Total Link Delay In order to improve performance the 2 048Mbps Wireless Modem uses an Automatic Retransmission Queuing ARQ mechanism that enables to detect errors in the received data and to requ...

Page 62: ...ctual value of the link delay is dependent on the modem rate and data rate configuration and is displayed when setting the total link delay Modem Initialisation String In order to enable remote site m...

Page 63: ...commands resembling the ones in the default string above Then you must enter the new initialisation string accordingly The maximum length of the string is 50 characters For example if you wish to add...

Page 64: ...wing parameters Modem Rate Hopping Sequence Transmit Power Test Sequence Add Remove Channels menu Table 3 10 Radio and Modem Parameters Menu Options Modem Rate The modem rate is set automatically acco...

Page 65: ...e used for all units or else the synchronized units will interfere with each other as though not synchronized the synchronization process verifies that each pair uses a sequence that is sufficiently s...

Page 66: ...atabase is loaded you can view or change the parameters of the remote unit At this state an indication of being in Remote Monitor mode appears at the end of the first line of each menu Switch to Local...

Page 67: ...ll take effect 1 Do not download database yet Reset the remote unit for the changes to take effect Copy database and download to remote unit Typically this is the simplest fastest and safest procedure...

Page 68: ...d are not affected by this operation Parameter Info Screen Option 6 in the Parameters menu opens the Info Screen which presents information on the current status of main parameters of either the local...

Page 69: ...er errors per channel Type 4 to clear the System Counters and the Channel Tracer Type 5 to display Time Tracer errors versus time Type 6 to display maximum number of consecutive traced errors versus t...

Page 70: ...since the last time the counters were Cleared The 2 048Mbps Wireless Modem uses an Automatic Retransmission Queuing ARQ mechanism that enables to detect errors in the received data and to request ret...

Page 71: ...ation with the end equipment is not subject to any interruptions and LIU ERROR BUFFERS as well as the LIU BUFFERS ERROR RATE should be 0 Note Buffer Error Rate is different from Bit Error Rate Each bu...

Page 72: ...conditions High error rate combined with a relatively high number of not received buffers indicates weak radio signal or existence of an interfering signal source The Error correction algorithm graph...

Page 73: ...the channel s with the minimal RSSI channel 47 in the example above A column with a sign at the bottom channel 39 in the example above represents a channel that is either blocked or is not included in...

Page 74: ...unters and Tracers menu type 5 to display the Time Tracer errors over time graph Figure 3 11 Time Tracer Errors vs Time Graph The graph displays the Radio Error Buffers Rate over time up to the presen...

Page 75: ...ters and Tracers Menu or the history since the last time the Time Tracer was reset see also page 76 This tracer is very important since long bursts of consecutive errors can pass the ARQ error correct...

Page 76: ...s cleared CAUSE OF LAST RESET The cause of the last reset Possible causes are Normal Error Condition A normal reset following an error burst A normal reset is defined as a reset that may occur during...

Page 77: ...ed by a cable problem or because the end equipment is not connected to the unit Correction Check the cable and or the connection of the end equipment to the unit Message AIS Description Indicates an a...

Page 78: ...ection Configure properly the clocks in the end equipment Message Remote BreezeLINK Unsync Description In Fractional E1 or Fractional T1 applications indicates a temporary incidence of a very noisy ra...

Page 79: ...scription The radio does not receive enough power on one or more channels Correction Use a higher gain receive antenna use a higher gain transmit antenna or a Transmit Power Amplifier at the opposite...

Page 80: ...ack mode Correction Check the clock configuration Message WARNING LIU Clock frequency differs from set value Description Indicates a clock rate different from the one specified in a V 35 RS 530 X 21 u...

Page 81: ...ng sequences are selected in the two units Test Sequence channels different sequences used in test mode Clock Rate different clock rates selected in the two units Delay Setting different link delay se...

Page 82: ...n Note User access rights enable access to Set up and Configuration functions Only Site Survey Mode The Site Survey test gives you an indication of the electromagnetic environment It can also be used...

Page 83: ...2 in the Mode and Access Control Menu and reset the unit The system start collecting information on received interference levels in applicable channels and displays the histogram To exit the Site Surv...

Page 84: ...a rate is poor or the end equipment loses synchronization from time to time The system resets with an error message One or more links function are synchronized but when adding another link performance...

Page 85: ...e not reversed Verify that the One Antenna Standard Diplexer is the selected hopping sequence If you use the Transmit Power Amplifier TPA 24 Check the 12 VDC power supply jumpers on the Modem transmit...

Page 86: ...ment is harder to detect with the channel tracer To correct the configuration From the Parameters menu select Parameter Info Screen The following parameters must be identical on both units Hopping Sta...

Page 87: ...e connecting the unit to the end equipment Verify that the LOS LED is not On Check that the balanced unbalanced configuration of the LIU module jumpers setting matches the setting of the end equipment...

Page 88: ...appears this indicates that the difference between the LIU clock rate and the modem rate is too low to correct all radio errors To solve this problem Improve the radio link quality reduce error rate...

Page 89: ...o link quality the lower the delay that can be set without introducing errors Where the delay cannot be reduced an external echo canceller is required In fractional E1 T1 applications use the built in...

Page 90: ...90 2 048Mbps Wireless Modem SALES 0118 965 5100 Problem 7 The system resets with an error message Use the following table to determine the source of the error messages...

Page 91: ...91 2 048Mbps Wireless Modem TECHNICAL 0118 931 2233...

Page 92: ...t configuration of all units connected by the synchronization cable Physical problems with the synchronization cable To check the configuration of each unit 1 In the Counters and Tracers menu select W...

Page 93: ...g signalling information 2 Check that all the relevant channels are selected in both 2 048Mbps wireless Modems If Fax es does not work properly 1 Verify that the tone disabling method selected in the...

Page 94: ...the error rate of the LIU link is not too high It is recommended that the LIU BUFFER ERROR RATE should not exceed 10 5 Contact Black Box Should you still have problems contact your local Black Box All...

Page 95: ...o 512kbps with RS 530 V 35 or X 21 interface Call Black Box for a quote for this model Radio and Modem Specifications Radio Type Full duplex point to point independent transmit and receive radio chann...

Page 96: ...e Channel Bandwidth The bandwidth for each channel is 20dBc at 500KHz from carrier regardless of bit rate System Bandwidth 2400 2500MHz Different frequency bandwidth is available according to the diff...

Page 97: ...rate does not include the error correction algorithm which can improve sensitivity by up to 3dB depending on the settings of the unit Table 5 4 Receiver Sensitivity as a Function of the Radio BER Rec...

Page 98: ...s 0 5Mbps 1Mbps 2Mbps 25dBm for modem rate of 3Mbps Recommended Receive Level 10dB above sensitivity threshold for an adequate fade margin Adjacent Channel Rejection Adjacent channel rejection indicat...

Page 99: ...h below displays the adjacent channel rejection of the modem receiver as a function of the frequency separation Delta F in MHz between the frequency of the interfering signal and the desired signal Fi...

Page 100: ...umber of Links to Synchronize Table 5 6 Maximum Number of Synchronized Links Filter Curves Filter curves for the transmitter and receiver are shown in the graph below Note that the receiver contains t...

Page 101: ...ecifications Data Rates Full Duplex Nx64Kbps 64 128 2048kbps N x 64Kbps 64 128 2048 Kbps LIU Options T1 Interface Data Rate 1544 Kbps Type DSX 1 meets CCITT G 703 and G 823 Connector RJ 45 Line Mode B...

Page 102: ...EPT I meets CCITT G 703 G 704 and G 823 Connector 2 x BNC unbalanced RJ 45 balanced Line Code HDB3 or AMI Impedance 75 unbalanced 120 balanced V 35 Interface Data Rate 64 2048 Kbps N x 64 Type Synchro...

Page 103: ...o Canceller Fractional E1 T1 Meets ITU T recommendations G 165 and G 168 Front Panel LED Indicators General Power TEST Line Data Link Status LOS Loss of Signal T1 E1 only AIS Alarm Indication Signal T...

Page 104: ...female connector Access using a locally connected ASCII terminal or remotely via dial up modem Remote unit management through the wireless link Mechanical Specifications Dimensions Standard 1U half 19...

Page 105: ...Bm 0dBm Lowinput TPA 24 LH 0dBm 10dBm High input Output Power 24 dBm 250mW fixed output level Input Impedance 50 Output Impedance 50 Operating Temperature 20 C to 50 C Power Requirements 12V 420 mA po...

Page 106: ...20mA Operating Temperature 20 C to 50 C Dimensions 60mm x 35mm x 25mm 2 3 x 1 3 x 1 Operating Environment LNA 10 outdoor indoor Power Supply indoor Power Inserter indoor Technical specifications are l...

Page 107: ...eless Modem TECHNICAL 0118 931 2233 Operating Environment Indoor Outdoor Grounding One of the female type N connectors is mounted directly through a hole in the shelter wall and held in place with a l...

Page 108: ...he standards define DATA circuits and LOCK circuits to time them The end equipment is normally called DTE and the modem is normally called DCE A DTE connects to a DCE DTE or DCE assignments define the...

Page 109: ...lock supplied by the DTE is identical to the clock supplied by the 2 048Mbps Wireless Modem Standard Configuration Figure A 1 Standard modem Application Both wireless modem units are configured as DCE...

Page 110: ...S 530 V 35 X 21 Back to Back Configuration Figure A 4 RS 530 V 35 X 21 Back to Back Configuration Setting the Jumper Configuration for the LIU V 35 and LIU RS 530 X 21 Boards You can access the jumper...

Page 111: ...931 2233 DCE Options 1 DCE internal clock Supported by V 35 RS 530 and X 21 Jumper configuration Figure A 5 DCE Internal Clock Jumpers 2 DCE external clock Supported by V 35 and RS 530 Jumper configur...

Page 112: ...set the DCE DTE mode 1 From the Setup and Configuration Main menu type 1 to access the Parameters menu 2 From the Parameters menu type 1 to access the LIU Parameters menu 3 From the LIU Parameters me...

Page 113: ...X 21 mode Valid selections are in accordance with following guidelines DCE internal clock V 35 Rs 530 X 21 Supported by V 35 RS 530and X 21 DCE external clock V 35 RS 530 Supported by V 35 and RS 530...

Page 114: ...ndix provides information about E1 T1 LIU board jumper settings In addition some explanation is provided on T1 CSU DSU applications E1 T1 Connections and Common Problems Link Setup The set up includes...

Page 115: ...ble being disconnected or shortened Both these situations usually result in LOS indication either by the modem or by the end equipment E1 T1 LIU Jumper Settings The LIU default setting is E1 balanced...

Page 116: ...he bottom side of the LIU board shown in Figure B 3 3 Turn the boards over loosen and remove the three screws connecting the LIU board to the main board 4 Unscrew and remove the nuts and the spring wa...

Page 117: ...117 2 048Mbps Wireless Modem TECHNICAL 0118 931 2233 Figure B 3 E1 Unbalanced Coax connector 75 W Figure B 4 E1 balanced RJ 45 connector 120 W Figure B 5 T1 balanced RJ 45 connector 100 W...

Page 118: ...ask requirements of the DSX 1 standard the Pulse Shape Parameter should be set according to the line length Figure B 7 T1 CSU Network Interface In several applications the modem may be connected to CS...

Page 119: ...119 2 048Mbps Wireless Modem TECHNICAL 0118 931 2233 E1 T1 Back to Back Configuration Figure B 8 E1 T1 Back to Back Configuration...

Page 120: ...The Fractional E1 T1 LIU may also be used in applications without voice channels However the cost of the Fractional E1 T1 LIU is higher than that of the regular E1 T1 LIU In some cases the use of the...

Page 121: ...sing CAS channel 0 is always used for frame alignment signals and a maximum of 31 channels is available to the user with a maximum data rate of 2048Kbps Table C 1 Channels Characteristic The default m...

Page 122: ...ssibility of a cable being disconnected or shortened Both these situations usually result in LOS indication either by the 2 048Mbps Wireless Modem or by the end equipment Fractional E1 LIU Jumper Sett...

Page 123: ...access the jumpers 1 Disconnect all cables including the power cable from the unit 2 Loosen and remove the two screws on the rear panel Carefully slide out the boards The jumpers are located at the up...

Page 124: ...124 2 048Mbps Wireless Modem SALES 0118 965 5100 Figure C 3 Fractional E1 Unbalanced Coax connector 75 W Figure C 4 Fractional E1 balanced RJ 45 connector 120 W...

Page 125: ...DSX 1 standard the Pulse Shape Parameter should be set according to the line length option 1 to 5 Figure C 6 Fractional T1 CSU Network Interface In several applications the 2 048Mbps Wireless Modem m...

Page 126: ...transmission lines and since this impedance may vary optimal performance of the hybrid cannot be assured This imperfection results in the generation of an echo signal the transmitted signal at a leve...

Page 127: ...other method for disabling echo cancellation is VPA Voice Path Assurance based on identification of a continuous tone in the 2000 2100Hz range Echo cancellation should not be used in non voice channel...

Page 128: ...lar to the installation of the LNA 10 2 048Mbps Wireless Modem can be set to provide 12 VDC power via the Receive RF cable There are two ways to supply 12 VDC to the receive amplifier Separate DC inpu...

Page 129: ...ting for 12 VDC Power Supply To supply DC input through the RF cable 1 Connect the RF Power Cable directly to the RF input in the Receive Amplifier 2 Set the jumper Jp1 in the Rx Radio module to 12 VD...

Page 130: ...Modem SALES 0118 965 5100 Appendix E Pin Assignments E1 T1 and Fractional E1 T1 Pin Connections Table E 1 E1 T1 and Fractional E1 T1 Pin Connections LIU RS 530 Connector Pin Assignments Figure E 1 LIU...

Page 131: ...131 2 048Mbps Wireless Modem TECHNICAL 0118 931 2233 LIU D 25 to V 35 Cable Pin Assignments Figure E 2 LIU D 25 to V 35 Cable Pin Assignments...

Page 132: ...132 2 048Mbps Wireless Modem SALES 0118 965 5100 LIU D 25 to X 21 Cable Pin Assignments Figure E 3 LIU D 25 to X 21 Cable Pin Assignments...

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