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COMSPHERE 3600 Series Data Service Units

C-2

July 1999

3610-A2-GB41-70

Figure C-1. TDM Interface Cable (Feature Number 3600-F2-500)

Table C-1

(1 of 3)

Time Division Multiplexer Connector Used with Non-Modular TDM

60-Position

High-Density Connector

25-Position Socket D-Sub

P1 Pin

Port

Pin

J2 = Port 2

J3 = Port 3
J4 = Port 4

J5 = Port 5
J6 = Port 6

Summary of Contents for COMSPHERE 3610

Page 1: ...COMSPHERE 3600 SERIES DATA SERVICE UNITS MODELS 3610 AND 3611 TIME DIVISION MULTIPLEXER MULTICHANNEL MULTIPOINT AND DIGITAL BRIDGE OPTIONS APPLICATIONS GUIDE Document No 3610 A2 GB41 70 July 1999...

Page 2: ...em to Technical Publications Paradyne Corporation 8545 126th Ave N Largo FL 33773 or send e mail to userdoc paradyne com Include the number and title of this document in your correspondence Please inc...

Page 3: ...ervice personnel 6 General purpose cables are provided with this product Special cables which may be required by the regulatory inspection authority for the installation site are the responsibility of...

Page 4: ...COMSPHERE 3600 Series Data Service Units C July 1999 3610 A2 GB41 70 Notices...

Page 5: ...Warranty and Support 1 9 2 Model 3610 Installation Overview 2 1 Hardware Straps 2 2 Changing Hardware Settings 2 4 Electrical Connection 2 8 Network Diagnostic Connection 2 10 Software Configuration...

Page 6: ...on Overview 4 2 Network Terminology 4 2 Modes Of Operation 4 4 Time Division Multiplexing 4 5 Multichannel Multipoint 4 21 Digital Bridge 4 35 NMS Control 4 52 SNA Diagnostic Interface 4 53 5 DSU Oper...

Page 7: ...ture and Signal Flow 4 7 4 4 Single Port Point to Point Circuit with Nondisruptive Diagnostics 4 8 4 5 Multipoint Async Compatible Network 4 9 4 6 Point to Point Multiplexing 4 10 4 7 TDM with Extende...

Page 8: ...ing in a Point to Point Circuit 4 58 4 47 Digital Sharing in a Multipoint Circuit 4 59 4 48 Digital Sharing in a TDM Circuit LPDA 2 Monitoring 4 60 4 49 Digital Sharing in an MCMP Circuit LPDA 2 Monit...

Page 9: ...All Drops D 16 D 9 Extended Bridge Configuration Automatic Partial Backup Active Dial Backup Active for Two Drops D 17 D 10 NMS Controlled Full Backup Configuration Dial Backup Not Active D 20 D 11 NM...

Page 10: ...figuration Options 5 36 5 10 Complete List of MUX Port Configuration Options 5 38 5 11 Poll List Menu Options 5 40 5 12 Directory Entry and Password Characters 5 42 5 13 Control Branch Menu Options 5...

Page 11: ...nfiguration or if your application uses DBM Vs DBM Ss or DBM Ds It also provides a NetViewt commands reference for your convenience How to Use this Guide Chapter 1 gives a general overview of the feat...

Page 12: ...r Unit Installation Guide 3610 A2 GB42 COMSPHERE 3600 Series Data Services Units Models 3610 and 3611 Secondary Channel Applications Supplement 6700 A2 GB41 COMSPHERE 6700 Series Network Management Sy...

Page 13: ...e The time division multiplexing multichannel multipoint digital bridge and multipoint backup capabilities are discussed in this applications guide LPDA 2 interoperability as it applies to application...

Page 14: ...ithout the TDM or MCMP option are also available with the TDM or MCMP option Control of a TDM MCMP digital bridge session can be performed from the DCP from an Async Asynchronous Terminal or from a CO...

Page 15: ...r both the inbound toward the control DSU and outbound from the tributary DSU directions Digital bridge The TDM can be configured to perform a digital bridge function The digital bridge capability can...

Page 16: ...annels The channel speed choices are the same as those for synchronous operation The word size can range from 6 to 10 bits and one or two stop bits can be specified Asynchronous data rates of 150 300...

Page 17: ...e performed if the DSU s rate is not equal to the DBM s rate Security The V 32 DBM or DBM V the 4 wire Switched 56 DBM or DBM S or the 2 wire Switched 56 DBM or DBM D provide four levels of call setup...

Page 18: ...ingle multiport interface connector mounted directly onto the rear of the TDM or MCMP circuit card The EIA 232 D V 24 or V 35 interface connector at the rear of the DSU is Port 1 the TDM or MCMP multi...

Page 19: ...RK DIAGNOSTIC INTERFACE DBM INTERFACE DDS INTERFACE LOW VOLTAGE AC POWER IN COMSPHERE 3610 PORT 5 PORT 6 PORT 2 PORT 3 PORT 4 ADDITIONAL EIA 232 INTERFACES PORT NUMBERS 2 6 STATUS INDICATORS TABLE TOP...

Page 20: ...COMSPHERE 3600 Series Data Service Units 1 8 July 1999 3610 A2 GB41 70 Figure 1 2 Model 3611 DSU with TDM or MCMP...

Page 21: ...h AT T MCIr and US SPRINTr using dedicated 4 wire access DBM D A DBM D provides the capability to utilize the 2 wire switched 56 kbps digital service to back up a failed multipoint DDS circuit via a d...

Page 22: ...COMSPHERE 3600 Series Data Service Units 1 10 July 1999 3610 A2 GB41 70...

Page 23: ...nector Order a V 35 adapter cable feature number 3000 F1 510 for each TDM or MCMP port that you intend to operate as a V 35 interface All ports are configured for EIA 232 operation before leaving the...

Page 24: ...ormation order the COMSPHERE 3600 Series Data Units Models 3610 and 3611 Dial Backup Module and SNA Diagnostic Interface Options Applications Guide Hardware Straps HANDLING PRECAUTIONS FOR STATIC SENS...

Page 25: ...Model 3610 Installation 2 3 3610 A2 GB41 70 July 1999 Figure 2 1 Model 3610 TDM Flex or MCMP Flex Switch Locations Figure 2 2 Model 3610 TDM DSD or MCMP DSD Circuit Card Switch Locations...

Page 26: ...d make sure that the unit is disconnected from its power source before changing the Flex interface switch position Procedure 1 With the unit upside down use a small flat head screwdriver to release th...

Page 27: ...lat cable by gently working the cable not the connector free of its connector Be careful not to bend any of the cable pins 5 Disconnect the TDM MCMP flat cable 6 Unscrew the three screws that hold the...

Page 28: ...but only Strap 1 is used S1 is not installed on 2 port versions of the TDM Flex or MCMP Flex 3 Insert a small pointed tool into position 1 of Switch S1 and carefully flip the switch in the direction o...

Page 29: ...hat from the rear the option card reads THIS SIDE FACES REAR FOR V 35 3 Reinstall the DSU circuit card securing it to the base with the three screws refer to Figure 2 4 4 Reconnect the LCD keypad and...

Page 30: ...to the ac outlet The unit performs a power up routine CAUTION Only use the power transformer designed for the Model 3610 DSU Using other transformers may result in personal injury or damage to the equ...

Page 31: ...ACE PORT 1 EIA 232 D V 24 INTERFACE PORT 1 PORT 2 PORT 3 PORT 4 LOW VOLTAGE AC POWER IN DBM INTERFACE DDS INTERFACE NETWORK DIAGNOSTIC INTERFACE PORT 5 PORT 6 NOTE ADDITIONAL EIA 232 INTERFACES PORT N...

Page 32: ...611 Operator s Guide Network Diagnostic Connection The DSU may be set up for a diagnostic interface with the NMS using a 3600 Hubbing Device For further information about installing a hubbing device o...

Page 33: ...TDM or MCMP can be configured from an NMS provided the Position configuration option Diagnostic General is set to Trib from the DCP and the DSU is connected to a control DSU that is connected to the N...

Page 34: ...l Backup mode to ensure that both DSUs have been configured correctly 3 Perform a Digital Test on both the DBM and the PSTN or switched 56 kbps circuit For a DSU equipped with both DBM and TDM or MCMP...

Page 35: ...2 port TDM Flex or MCMP Flex is not supported If installing a 6 port TDM Flex or MCMP Flex and your DSU has a wall mount ac transformer a table top transformer must be ordered part number 654 0099 01...

Page 36: ...led BACKUP and CC DC respectively if installed 4 Disconnect the EIA 232 D V 24 or V 35 interface cable from the DSU 5 If a TDM or MCMP is being replaced disconnect the additional port interface cable...

Page 37: ...clean ESD anti static workpad 5 Write the serial number from the existing base onto the new TDM or MCMP expanded base using indelible ink see Figure 2 3 Discard the existing base and rear panel Insta...

Page 38: ...plug of the table top ac transformer into the ac outlet If installing a 6 port TDM Flex or MCMP Flex and the DSU has a wall mount ac transformer the wall mount ac transformer must be replaced with a...

Page 39: ...point to point circuit with diagnostic protocol set to ADp When a TDM or MCMP is installed Port 1 of the DSU is configured to operate at 9 6 kbps with the TDM or MCMP capability enabled all other por...

Page 40: ...nnector module is a 25 pin connector that provides the EIA 232 DTE interface All port connectors are individual with this type of unit and a separate crossover cable is required for each connector tha...

Page 41: ...est Mode Indication jumper is enabled the V 35 lead NN and Pin 25 on the EIA 232 D V 24 interface go to ON EIA level condition during a Test mode This is the default setting on a DBM V DBM S or DBM D...

Page 42: ...Multipoint and Digital Bridge Options User s Guide Supplement or Configuration Options Chapter 6 of the COMSPHERE 3600 Series Data Service Units Models 3610 and 3611 Operator s Guide For a listing of...

Page 43: ...o verify network operation Procedure 1 Request a device Identity ID from the Status branch report from each tributary to ensure that the DSU is addressed properly 2 Perform a Digital Test on the DDS c...

Page 44: ...iguration Options Opts submenus Adding a TDM or MCMP to an Installed Model 3611 DSU This section describes the installation procedure for adding the TDM or MCMP option onto the Model 3611 DSU and then...

Page 45: ...ing standoff posts to the DSU with the two Phillips head screws and flat washers Tighten the screws until the standoff posts fit snugly against the circuit card do not overtighten 7 Install the black...

Page 46: ...iguration for a tributary or FacC for a control 2 Confirm the installed hardware options DBM TDM or MCMP 3 Re execute the Device Test from the SDCP Press the key to return to the top level menu then s...

Page 47: ...Model 3611 Installation 3 9 3610 A2 GB41 70 July 1999 Figure 3 3 Non Modular TDM or MCMP Installation...

Page 48: ...00 Series Carrier you can remove the modular DSU with a TDM or MCMP without disconnecting the DTE cables at the rear of the carrier Each port on the connector module is a DB25 connector which provides...

Page 49: ...ll out and down on the latch at the bottom of the modular DSU s faceplate until the circuit card starts to come out of its slot in the carrier Pull the circuit card free of the carrier and set the DSU...

Page 50: ...ar TDM or MCMP Make sure that the double ended pin headers are properly aligned Then snap the snaplock posts into the modular TDM or MCMP 6 Use the remaining four Phillips head screws and flat washers...

Page 51: ...U TDM or DSU MCMP unit free of the carrier and lay it on a clean ESD workpad 4 On the TDM or MCMP side of the unit remove the screws securing the standoff posts to the TDM or MCMP circuit card For a n...

Page 52: ...COMSPHERE 3600 Series Data Service Units 3 14 July 1999 3610 A2 GB41 70...

Page 53: ...ultichannel Multipoint 4 21 Line and Channel Speeds 4 23 MCMP Overhead Composition 4 23 Management Channel 4 23 In Band Secondary Channel Transport 4 23 Number of Tributaries 4 23 MCMP Architecture 4...

Page 54: ...An MCMP can be configured to provide point to point time division multiplexing multichannel multipoint multiplexing or digital bridge capability Network Terminology Data transmission between 3600 Seri...

Page 55: ...The FEP a communications computer associated with a host computer is the data terminal equipment DTE at the control DSU A 3600 Series DSU can be configured as a control or as a tributary in multipoint...

Page 56: ...no TDM or MCMP circuit card attached to the DSU TDM Mode In TDM mode data paths are established between the DSU and TDM to increase the port capacity of the DSU to six ports All six ports can be confi...

Page 57: ...h TDM or MCMP operating in TDM mode can provide the equivalent of up to six point to point circuits via a single DDS line Figure 4 2 This single DDS line is able to carry six separate channels by inte...

Page 58: ...proper operation the receiving TDM must be in synchronization with the transmitting TDM To ensure synchronization the transmitting TDM adds an extra bit to each TDM frame called a framing bit to crea...

Page 59: ...a physical EIA 232 D V 24 or V 35 interface Ports 2 through 6 comply with a subset of EIA 232 interface recommendations The circuit leads supported on Ports 1 through 6 are discussed in Appendix C NOT...

Page 60: ...3611 Operator s Guide for the maximum diagnostic rate that can be run for various asynchronous to synchronous configurations Note that in this table None indicates that no excess bandwidth is availab...

Page 61: ...control DSU s software version is 6 xx otherwise the units should be returned to the factory to be upgraded Contact your authorized service representative to arrange for your upgrade Figure 4 5 shows...

Page 62: ...s Figure 4 6 shows a typical TDM application In point to point multiplexing the DTEs at Port 1 communicate with one another the DTEs at Port 2 communicate with one another and so on The TDM point to p...

Page 63: ...tend diagnostic control to other Paradyne devices at the remote location Digital Sharing Digital sharing is a TDM or MCMP feature that allows up to six ports to share the same channel Typically this i...

Page 64: ...COMSPHERE 3600 Series Data Service Units 4 12 July 1999 3610 A2 GB41 70 Figure 4 8 Digital Sharing...

Page 65: ...configured as a digital sharing group For example two digital sharing groups can be multiplexed with the remaining port forming three channels as shown in Figure 4 9 The three channels are designated...

Page 66: ...configuration option to DTE and its TxCarrSel configuration option to Cntrl Set the control DSU s port RxCarrSel configuration option to Cntrl In addition at the control DSU FEP port sharing can be co...

Page 67: ...Principles of Operation 4 15 3610 A2 GB41 70 July 1999 Figure 4 10 FEP Port Sharing...

Page 68: ...he DDS network is out of service the network management system can initiate dial backup or if configured for automatic dial backup the control or tributary DSU can initiate dial backup Once the link i...

Page 69: ...ous ports must be configured for underspeed One possible configuration is to allow one port to remain at 9600 bps reconfigure one port to 4800 bps running at underspeed and reconfigure all other ports...

Page 70: ...ed of the extended circuit must be reduced then the speed of the extended modems must be reduced accordingly The speed selection feature of the TDM circuit card will provide this function to modems su...

Page 71: ...s or less Figure 4 14 The Switched 56 DBM provides full backup of point to point single port and TDM circuits operating at 56 kbps If the DDS circuit is operating at less than 56 kbps rate adaption is...

Page 72: ...DBM when in Dial Backup mode The DBM S should be commanded to dial the remote DBM using the Dial command and to activate the data over the backup line using the switch to Dial Dial command The DSU sho...

Page 73: ...tions over a single 56 kbps standard multipoint digital facility The MCMP capability provides up to six user selectable full duplex channels plus a channel for diagnostic transport Any of the user sel...

Page 74: ...BB and Channel C is assigned to Port 3 allowing the security systems connected to this port to access application CC Figure 4 17 shows how the three independent applications can be combined via the MC...

Page 75: ...out disrupting user transmitted data When the MCMP capability is activated for the first time the control DSU with MCMP determines the roundtrip delay parameters that are critical to MCMP operation MC...

Page 76: ...een the MCMP and the DSU and emerges as a physical interface either EIA 232 D V 24 or V 35 on the DSU The DTE cabling for the MCMP capability is the same cabling used for the TDM capability For non mo...

Page 77: ...r Stop Bits During MCMP operation the Channel Speed and Asynchronous configuration values at the control DSU are downloaded to the tributaries on the control DSU s poll list every 10 seconds The downl...

Page 78: ...digital sharing at the same time Up to three digital sharing groups can be formed at each tributary site A digital sharing group is formed by assigning the same channel to each port in the group All p...

Page 79: ...to the MUX Configuration Options section of Chapter 5 Figure 4 20 shows an MCMP application using three channels where a digital sharing group has been formed at each of the tributary locations Notic...

Page 80: ...ed for extended bridge EBrdg mode is used to bridge the aggregate data stream to the DBMs If the control DSU MCMP is enabled for Aggregate Switching aggregate data data framing and diagnostics is rout...

Page 81: ...t Because the backup is performed in TDM mode both TDM and MCMP configuration options must be set Therefore Port 1 at the control DSU should be mapped to Port 1 at the tributary DSU For Case 1 only tw...

Page 82: ...ation must be equipped with a DBM and the MCMP Backup configuration option must be set to TDM with only one port assigned bandwidth At the central site an extended bridge and a DBM V for each tributar...

Page 83: ...dge unit and DBM Vs where it is routed to the tributary DSU s via the PSTN connections All other channels to the tributaries in backup are lost until the alarm is fixed and the MCMP circuit is restore...

Page 84: ...operating in TDM mode must be available for each tributary to be backed up Using the FEP port sharing feature three channels from the control DSU MCMP can be daisy chained to a set of DSU DBM TDM uni...

Page 85: ...rl at the control Since the dial backup operation is performed in TDM mode the MCMP channel to port assignment capability is not available Port 1 at the control DBM should map to Port 1 at the tributa...

Page 86: ...e or Disr To establish a partial backup command the control DBMs to call the remote DBMs using the Dial command followed by the sf command from the 6800 Series NMS or Dial command from the DCP DSU tim...

Page 87: ...ridge EBrdg when more bridging capability is needed The digital bridge capability allows for multipoint transmission from a local digital bridge Figure 4 28 as opposed to network bridging The DTE conn...

Page 88: ...SU MCMP units configured as an extended bridge EBrdg can be connected to the central site bridge the controlling bridge Up to four extended bridges can be added to a central site bridge to provide a t...

Page 89: ...le for each bridge port When the digital bridge is active as shown in Figure 4 30 data from the controlling DTE flows to the aggregate data path of the TDM or MCMP circuit card where it is broadcast t...

Page 90: ...DSU through a backup connection Full backup to each tributary on multipoint circuits is necessary when the speed of the DDS line and the dial backup modules cannot be matched or when the DDS facility...

Page 91: ...Principles of Operation 4 39 3610 A2 GB41 70 July 1999 Figure 4 31 Multipoint DDS Circuit in Partial Backup...

Page 92: ...y DSU Figure 4 32 The term under as used here means that the sequential address begins with the control channel followed by the slash delimiter and the DSU network address followed by the slash delimi...

Page 93: ...Principles of Operation 4 41 3610 A2 GB41 70 July 1999 Figure 4 33 Tributary Addressing via Backup Connections...

Page 94: ...nfiguration option Bridge Rate is set to DSU the first port of the digital bridge is included in the digital sharing group Under these conditions the digital bridge is active during normal operation a...

Page 95: ...from the DDS line Figure 4 35 incoming data from the DDS line is merged with incoming data from tributaries communicating with the bridge via DBM V DBM S or DBM D and backup connections NOTE In multi...

Page 96: ...ation To go into full backup the bridge may be activated by an 6800 Series NMS Standby Facility sf command or from the DCP Backup Bkup command Figures 4 36 and 4 37 illustrate this The 6700 Series NMS...

Page 97: ...s and Call Setup security procedures as DBMs at the tributary location The DBM V DBM S or DBM S is addressed just as a DBM is addressed via an NMS or the SDCP Likewise configuration options are set ju...

Page 98: ...cting DBMs are not required to have the V 13 feature enabled Tributary DSU Considerations In multipoint backup the firmware version of the tributary DSU DBM in a multipoint circuit determines the feat...

Page 99: ...V pair should have compatible security options If there is a failure in the backbone DDS network the control DSU reports a Facility Alarm FA or Tributary Time out Alarm Time to the NMS The 6700 Series...

Page 100: ...the DSD capability at a remote location The 3600 Series DSUs with the digital bridge capability TDM or MCMP circuit card operating in Bridge mode can be used to support multipoint LADS operation Table...

Page 101: ...eater than 19 2 kbps the distance between the DSUs and the digital bridge should not exceed one digital bridge interface cable Digital bridge interface cabling between the digital bridge ports and the...

Page 102: ...COMSPHERE 3600 Series Data Service Units 4 50 July 1999 3610 A2 GB41 70 Figure 4 38 Bridged LADS Operation...

Page 103: ...4 39 the Bridge Rate configuration option must be set to DSU Configuration options are set via the DCP as discussed in Chapter 5 the Bridge Rate configuration option is discussed in the MUX Configurat...

Page 104: ...with TDM or MCMP the DATAPHONE II System Controller cannot configure the TDM ports or set port speeds Only the COMSPHERE 6700 or 6800 Series NMS can fully support TDM digital bridge and MCMP capabili...

Page 105: ...twork configuration options as well as access sophisticated alarm tracking reports The carrier mounted Model 3611 DSU or the standalone Model 3610 DSU can receive the SNA Diagnostic Interface firmware...

Page 106: ...terface option passes LPDA 2 commands via Port 1 of the TDM or MCMP NOTE For MCMP the channel assigned to Port 1 at the control DSU control tributary must also be assigned to Port 1 at each tributary...

Page 107: ...wed to respond to the LPDA Call Out and Disconnect LPDA 2 commands The Call Out command instructs the DSU to set up dial backup from the control site and switch to the PSTN line The Disconnect command...

Page 108: ...ommodate LPDA 2 monitoring on Port 1 NetView treats the TDM as a single point to point circuit and the MCMP as a single multipoint circuit For TDM LPDA 2 commands issued from NetView only affect Port...

Page 109: ...Principles of Operation 4 57 3610 A2 GB41 70 July 1999 Figure 4 44 Multiplexing with TDM LPDA 2 Monitoring Figure 4 45 Multiplexing with MCMP LPDA 2 Monitoring...

Page 110: ...rom the NetView operator s perspective the digital sharing feature appears as a unique DSU connected to each DTE The LPDA 2 address is set to the lowest PU address The DTE with the lowest PU address i...

Page 111: ...Principles of Operation 4 59 3610 A2 GB41 70 July 1999 Figure 4 47 Digital Sharing in a Multipoint Circuit...

Page 112: ...COMSPHERE 3600 Series Data Service Units 4 60 July 1999 3610 A2 GB41 70 Figure 4 48 Digital Sharing in a TDM Circuit LPDA 2 Monitoring...

Page 113: ...Principles of Operation 4 61 3610 A2 GB41 70 July 1999 Figure 4 49 Digital Sharing in an MCMP Circuit LPDA 2 Monitoring...

Page 114: ...COMSPHERE 3600 Series Data Service Units 4 62 July 1999 3610 A2 GB41 70...

Page 115: ...regate Switch 5 13 Bridge 5 13 Test Branch 5 14 Abort 5 15 Device Test 5 15 Loopback 5 17 Local Loopback 5 17 DTE Loopback 5 19 Digital Loopback 5 20 Remote Digital Loopback 5 22 Bilateral Loopback 5...

Page 116: ...ys indicate the key you should press to display the next screen in the example provided or the next screen in the procedure Refer to the COMSPHERE 3600 Series Data Service Units Models 3610 and 3611 O...

Page 117: ...faceplate provides additional device status and port selection information Table 5 1 describes the function of the TDM and MCMP faceplate indicators The DBM V DBM S and DBM D circuit cards are used wi...

Page 118: ...3611 496 12349 01 Figure 5 2 Model 3611 DSU and MCMP Faceplates TXD RXD RTS CTS DSR DTR LSD 103 104 105 106 107 108 109 OK Alrm Test Dial Status Front Panel DBM S 3600 TXD RXD RTS CTS DSR DTR LSD 103...

Page 119: ...s When the reload procedure is completed the Alrm LED goes Off and the TDM or MCMP OK LED comes ON Port 1 2 3 4 5 or 6 Green In TDM or MCMP mode 1 shows which port is being monitored the status of the...

Page 120: ...nterface circuit designations Control circuit active or Data circuit SPACE ing For the DSU with TDM or MCMP the circuit external lead states for any of the TDM or MCMP ports can be selected from the D...

Page 121: ...SU may vary depending upon the operating mode MUX Funct configuration option and the port selected Local Remote Menu Subbranches The Local branch menu has five subbranches and the Remote branch menu h...

Page 122: ...fer to the menu in Appendix A You will see Port Select under some of the menu selections which means that a Port Number screen will appear when operating in TDM MCMP or Bridge mode Use the F1 and F2 k...

Page 123: ...ke the following selections Local F1 or Remot F2 and Address Stat H S Devic Results When the digital circuit is the active link the first line displays a running normal operation timer hhh mm ss The s...

Page 124: ...Stat DTE NOTE If there is only one port the DTE Status screen is displayed If there is more than one port the Port screen is displayed prior to the DTE Status screen If using FEP port sharing select...

Page 125: ...est to send RTS lead and reports the DTE powered ON if the voltage is approximately less than 3V or greater than 3V for both EIA 232 and V 35 interfaces To access the Terminal Power report from the to...

Page 126: ...e Options Applications Guide DBM DBM V DBM S DBM D This section discusses the full set of commands available in the Backup branch when a DBM is installed NOTE References to DBM in this guide also appl...

Page 127: ...s when Bckup is selected With the addition of the TDM or MCMP circuit card the DCP operation remains unchanged while in Idle mode for the following Enabling disabling or placing the DBM in Dial Backup...

Page 128: ...ate data stream test the entire bandwidth Therefore during aggregate tests in band secondary channel transport communication is lost For tests such as aggregate Digital Loopback DL the control DSU rep...

Page 129: ...e DSU sends out polls to determine whether the DBM and MUX circuit cards are installed MUX indicates a TDM or MCMP The DSU then initiates a Device Test on itself and each of the available circuit card...

Page 130: ...d of Pass Also the Alarm Alrm status indicator lights and the failure is reported in the DSU s Health and Status The Alarm indicator remains lit and the failure continues to be reported until the Devi...

Page 131: ...o the DSU and verify that the DSU is functioning properly Figure 5 5 This test cannot be performed by the DBM Local loopback is used with the DTE test after the DSU passes the Device Test If you issue...

Page 132: ...conclusion NOTE When Nondisruptive Diagnostics is enabled Diag Type NonD Local Loopback disrupts secondary channel transport communications For a control DSU the DSU may report No Response or Tributa...

Page 133: ...access the DTE Loopback from the top level menu make the following selections Local F1 Test DSU or DBM select active core Lpbk DTE Port selection Results The test result is a message telling you whet...

Page 134: ...ircuit between two DSUs DTE connections to the DSUs are not required For the DBM Digital Loopback is used to determine whether the DBM connection to the dial network is functioning properly Digital Lo...

Page 135: ...ocal F1 Remot F2 and Address Test DSU or DBM select active core Lpbk DL Port Select when not operating in single port mode NOTE When the local DSU initiates Digital Loopback to a remote DSU via Remote...

Page 136: ...trol or tributary DSU originates Remote Digital Loopback both originating and targeted DSUs enter Test mode On a multipoint circuit all tributaries are placed in Test mode No other test can be run at...

Page 137: ...elections Local F1 Test DBM select active core Lpbk RL Port Select when not operating in single port mode Trib Address multipoint control DBM only For TDM or MCMP mode the following additional menu ap...

Page 138: ...guration choice see the General Configuration Option Table in Chapter 6 of the COMSPHERE 3600 Series Data Service Units Models 3610 and 3611 Operator s Guide NOTE If the Bilat Lpbk Bilateral Loopback...

Page 139: ...l transport data is not allowed to avoid disrupting in band secondary channel transport communications Selecting Prt1 allows both the test pattern and in band secondary channel transport data to propa...

Page 140: ...COMSPHERE 3600 Series Data Service Units 5 26 July 1999 3610 A2 GB41 70 Figure 5 10 Digital Test...

Page 141: ...tal Test results refer to the COMSPHERE 3600 Series Data Service Units Models 3610 and 3611 Dial Backup Module and SNA Diagnostic Interface Options Applications Guide End to End Test The End to End EE...

Page 142: ...dule and SNA Diagnostic Interface Options Applications Guide Table 5 7 End to End Test Results Results Reported By1 Information Displayed Time Local and remote DBM Running test timer The Clr selection...

Page 143: ...e BERT Port Select when not operating in single port mode or Aggr Selecting Aggr Aggregate allows the test pattern data to propagate the data path This is the same loopback configuration as Basic mode...

Page 144: ...COMSPHERE 3600 Series Data Service Units 5 30 July 1999 3610 A2 GB41 70 Figure 5 12 Bit Error Rate Tests in TDM or MCMP Mode...

Page 145: ...f any character indicator appears nonfunctional the DCP should be replaced If any of the LEDs do not work the circuit card should be replaced Pressing any key except the key will stop the LCD portion...

Page 146: ...hat Usr1 and Usr2 are storage areas for user defined configuration option sets and that Usr3 is shipped from the factory loaded with the configuration option sets for a DBM V DBM S or DBM D Usr3 can b...

Page 147: ...ration and access the MUX Setup submenu F1 Chang MUX Opts Copy Setup Prt1 F2 F3 Prt3 Prt4 Prt5 Prt6 Prt2 The Setup selection displays the first configuration option in the Setup option set MUX Funct w...

Page 148: ...ds are set in the PrtSp submenu The DSU will not save configuration option selections if there is a mismatch in option settings Refer to the COMSPHERE 3600 Series Data Service Units Models 3610 and 36...

Page 149: ...DSU Operations 5 35 3610 A2 GB41 70 July 1999 Figure 5 13 Choosing Mode of Operation and Setting Configuration Options...

Page 150: ...st set to Disab Lowest Port Select lowest port number in the second digital sharing group X X1 Ignored Ports in Gp Select number of ports to be in the second digital sharing group X X1 Ignored Port Cn...

Page 151: ...lues normally available to that option still appear but changes made have no effect the configuration option s value is not overwritten in software The Copy selection allows the set of configuration o...

Page 152: ...tion is also called pseudo controlled carrier PCC mode X X Forced to Const RxCarrSel Enable the receiving DSU to look for V 13 codes on an individual channel that indicate transitions of RTS at the re...

Page 153: ...you to change the primary and backup port speed configurations for TDM mode and the primary port speed and channel to port assignment configurations for MCMP mode For single port operation this option...

Page 154: ...ndisruptive and mixed diagnostics To access PList from the top level menu make the following selections Local F1 Confg PList The following appears F1 Poll List Displ Clr Chang F2 F3 Acq Add Press the...

Page 155: ...F2 F3 F1 Acquir Poll List Command Complete F2 F3 All tributary addresses have been acquired Directory The DSU s dial backup Directory Dir is available only if a DBM is installed and only from the Loc...

Page 156: ...a remote site A local telephone number can contain any of the characters listed in Table 5 12 Remember that the telephone number cannot contain any separating characters or spaces although other vali...

Page 157: ...DBM can be disabled if it is addressed from the Remote branch The Control branch menu has three selections Table 5 13 lists the selections on the Control branch menu Table 5 13 Control Branch Menu Op...

Page 158: ...e top level menu make the following selections Local F1 or Remot F2 and Address Ctrl TxCtl The Transmitter Control submenu in Local mode differs from the one in Remote mode Assume Local mode in the fo...

Page 159: ...s previously demonstrated LEDs The LEDs selection is only available from the Local branch This selection allows you to monitor any of the TDM or MCMP ports at any given time When a port is selected it...

Page 160: ...port to a new selection You must select Save to have the entry accepted Results The DSU displays the following indicating that the command has been put into effect F1 Save LEDs Port 2 Command Complet...

Page 161: ...A 1 3610 A2 GB41 70 July 1999 Data Service Unit Menu A...

Page 162: ...COMSPHERE 3600 Series Data Service Units A 2 July 1999 3610 A2 GB41 70...

Page 163: ...Data Service Unit Menu A 3 3610 A2 GB41 70 July 1999...

Page 164: ...COMSPHERE 3600 Series Data Service Units A 4 July 1999 3610 A2 GB41 70...

Page 165: ...M or MCMP operating in Bridge mode A Configuration Worksheet summarizes the DSU TDM s or DSU MCMP s option sets configuration options and configuration option values An explanation for each configurat...

Page 166: ...COMSPHERE 3600 Series Data Service Units B 2 July 1999 3610 A2 GB41 70 This page intentionally left blank...

Page 167: ...CC Buffer Enab Disab Elast Stor Enab Disab RTS CTS Del Chang 0 1040 ms 8 ms increments DTR Alarm Enab Disab Antistream Chang Disab 1 100 sec async terminal 0 100 DSR FrcOn Enab Disab DSR on Tst Enab D...

Page 168: ...18 0 16 8 14 4 12 0 9 6 9 2 8 4 7 2 4 8 4 0 2 4 2 0 1 2 Disab Prt6 56 48 38 4 32 28 8 19 2 18 0 16 8 14 4 12 0 9 6 9 2 8 4 7 2 4 8 4 0 2 4 2 0 1 2 Disab Underspeed Disab Prt1 Prt2 Prt3 Prt4 Prt5 Prt6...

Page 169: ...8 9 10 Hardware Straps Value DDD Interface Permissive Programmable Frame Ground Signal Ground Connected Disconnected Test Mode Indication Enabled Disabled ChgMd Options Value Mode DPII ADp DMC Not ava...

Page 170: ......

Page 171: ...Mark PCC Buffer Enab Disab Elast Stor Enab Disab RTS CTS Del Chang 0 1040 ms 8 ms increments DTR Alarm Enab Disab Antistream Chang Disab 1 100 sec async terminal 0 100 DSR FrcOn Enab Disab DSR on Tst...

Page 172: ...ue Prt1 56 48 38 4 32 28 8 19 2 18 0 16 8 14 4 12 0 9 6 8 4 7 2 4 8 4 0 2 4 2 0 1 2 Disab Prt2 56 48 38 4 32 28 8 19 2 18 0 16 8 14 4 12 0 9 6 8 4 7 2 4 8 4 0 2 4 2 0 1 2 Disab Prt3 56 48 38 4 32 28 8...

Page 173: ...Options Value Auto Bckup Enab Disab Backup Dir Chang 1 10 BckupOnCMI Enab Disab AutoRestor Enab Disab NtwkTimOut Chang min and sec RestorTimOut Chang min TriesTimeOut Chang min MultiCall Enab Disab H...

Page 174: ......

Page 175: ...rl Mark PCC Buffer Enab Disab Elast Stor Enab Disab RTS CTS Del Chang 0 1040 ms 8 ms increments DTR Alarm Enab Disab Antistream Chang Disab 1 100 sec async terminal 0 100 DSR FrcOn Enab Disab DSR on T...

Page 176: ...LatchLpbk On Off AggrSwitch Enab Disab AgSw Timing Int Aggr Prt1 Prt2 Prt3 Prt4 Prt5 Prt6 V 54 Lpbk Enab Disab LPDA 2 Options Value LPDA 2 Enab Disab LPDA Address Chang 1 256 SNA Backup Enab Disab Cod...

Page 177: ...r Type 2500 2600 3600s 3600e Br56 Diagnostic DBM Options Value Diag Type NonD Disr Mixed None 2nd Ch bps 100 400 800 1200 1600 RemoteDiag V 54 Enhan 2500 Diagnostic General Options Value Position Cntr...

Page 178: ...or DBM D only DBM D only General Options Value DTE Port EIA232 V 35 RTS Cntrl FrcOn DTE CTS Cntrl Std RTS AnitStream Chang Disab 1 100 sec async terminal 1 100 LSD Lead Std Delay FrcOn CTS Lead Std De...

Page 179: ...IA 232 D V 24 and V 35 connector pin assignments for Port 1 for all DSU TDMs and DSU MCMPs Figure C 4 and Figure C 5 show the V 35 adapters that are used with the standalone TDM DSD MCMP DSD TDM Flex...

Page 180: ...1 1 of 3 Time Division Multiplexer Connector Used with Non Modular TDM 60 Position High Density Connector 25 Position Socket D Sub P1 Pin Port 1 Pin 01 J3 05 02 J3 17 03 J3 08 04 J3 06 05 J3 12 06 J3...

Page 181: ...Position Socket D Sub P1 Pin Port 1 Pin 16 J2 20 17 J2 24 18 J3 07 19 J2 04 20 J5 02 21 J5 08 22 J2 12 23 J5 04 24 J6 07 25 J6 08 26 J6 06 27 J6 17 28 J6 03 29 J6 12 30 J4 07 31 J4 17 32 J4 02 33 J4...

Page 182: ...plexer Connector Used with Non Modular TDM 60 Position High Density Connector 25 Position Socket D Sub P1 Pin Port 1 Pin 46 J2 06 47 J2 17 48 J2 05 49 J2 03 50 J5 06 51 J5 05 52 J5 17 53 J5 24 54 J5 2...

Page 183: ...of 3 Digital Bridge Connector Used with Non Modular TDM MCMP 60 Position High Density Connector 25 Position Plug D Sub P1 Pin Port1 Pin 01 NC2 NC2 02 P3 24 03 P3 04 04 P3 20 05 NC2 NC2 06 P3 17 07 P3...

Page 184: ...lug D Sub P1 Pin Port1 Pin 14 P2 03 15 NC2 NC2 16 P2 06 17 P2 17 18 P3 07 19 P2 08 20 P5 03 21 P5 04 22 NC2 NC2 23 P5 08 24 P6 07 25 P6 04 26 P6 20 27 P6 24 28 P6 02 29 NC2 NC2 30 P4 07 31 P4 24 32 P4...

Page 185: ...MCMP 60 Position High Density Connector 25 Position Plug D Sub P1 Pin Pin Port1 45 NC2 NC2 46 P2 20 47 P2 24 48 NC2 NC2 49 P2 02 50 P5 20 50 P5 20 51 NC2 NC2 52 P5 24 53 P5 17 54 P5 06 55 NC2 NC2 56 N...

Page 186: ...COMSPHERE 3600 Series Data Service Units C 8 July 1999 3610 A2 GB41 70 Figure C 3 Pin Locations on the 60 Position High Density Connector of the Non Modular Carrier Mounted TDM MCMP Circuit Card...

Page 187: ...5 40 36 44 55 DB 114 Transmitter Signal Element Timing DCE Source 47 2 31 52 27 DD 115 Receiver Signal Element Timing DCE Source 16 7 39 54 59 CD 108 2 Data Terminal Ready DTR 17 6 38 53 60 DA 113 Tra...

Page 188: ...E Source alternate external control lead II 15 DB 114 Transmitter Signal Element Timing DCE Source 17 DD 115 Receiver Signal Element Timing DCE Source 18 LL 141 Local Loopback LL 191 Data Signal Rate...

Page 189: ...eady DSR F CF 109 Received Line Signal Detect LSD H CD 108 2 Data Terminal Ready DTR HH Positive Test Voltage KK Negative Test Voltage U W DA 113a b Transmitter Signal Element Timing DTE Source Y AA D...

Page 190: ...COMSPHERE 3600 Series Data Service Units C 12 July 1999 3610 A2 GB41 70 99 16294 Figure C 4 Modular DSU V 35 Adapter Plug Figure C 5 Modular DSU V 35 Adapter Cable Feature Number 3000 F1 510...

Page 191: ...est to Send RTS 5 D Clear to Send CTS 6 E Data Set Ready DSR 8 F Received Line Signal Detect LSD 20 H Data Terminal Ready DTR 21 J Ring Indicator RI 24 11 P S Transmit Data TXD 23 22 R T Received Data...

Page 192: ...COMSPHERE 3600 Series Data Service Units C 14 July 1999 3610 A2 GB41 70 Figure C 6 6 Port Connector Module Part Number 870 1700 0011...

Page 193: ...al Element Timing DCE Source 17 DD 115 Receiver Signal Element Timing DCE Source 20 CD 108 2 Data Terminal Ready DTR 24 DA 113 Transmitter Signal Element Timing DTE Source 1 EIA 232 refers to EIA 232...

Page 194: ...COMSPHERE 3600 Series Data Service Units C 16 July 1999 3610 A2 GB41 70 Figure C 7 6 Port V 35 Interconnect Cable Feature Number 3600 F3 500...

Page 195: ...E Data Set Ready DSR 8 F Received Line Signal Detect LSD 20 H Data Terminal Ready DTR 22 J Ring Indicator RI 1 18 L Local Loopback LL 21 N Remote Digital Loopback RL 2 14 P S Transmit Data TXD 3 16 R...

Page 196: ...COMSPHERE 3600 Series Data Service Units C 18 July 1999 3610 A2 GB41 70...

Page 197: ...ption settings needed to support that scenario Refer to Chapter 5 for additional configuration information When reviewing the configuration options keep the following in mind A set of configuration op...

Page 198: ...ntral site and the terminals and printer at the remote site The second scenario shows full backup of TDM circuits using Switched 56 DBMs TDM Scenario 1 Using Two Synchronous Channels In this configura...

Page 199: ...Disab P3 4 FEPSh Disab P5 6 FEPSh Disab Prt1 and Prt2 Prt3 through Prt6 N A Async Sync Disab TxCarrSel Const RxCarrSel Const Elast Stor Disab RTS CTS Del 0 AntiStream Disab PrtSp DSU Prt1 7 2 Prt2 2...

Page 200: ...red for automatic dial backup and automatic restoration for both the control and the tributary and LPDA 2 is enabled Make sure that you enter at least 2 minutes difference between the control s Networ...

Page 201: ...control Trib for tributary LinkConfig Pt Pt Diag Conn CC for control N A for tributary DBM AutoAnswer Enab Call Setup Pswrd RxPwd enter received password TxPwd enter transmit password V 13 Signl Disab...

Page 202: ...gital bridge The control and tributary DSUs are configured for mixed diagnostics Tributary DBMs are configured for 9 6 kbps operation automatic backup no fallback backup on network fault Network Time...

Page 203: ...bps It is not likely that backup can be accomplished before the network has timed out and the affected tributaries have been taken off the host s active list However if they are placed on an FEP s sl...

Page 204: ...and DBM are configured for password security Call Setup PsWrd the DBM V s outgoing password TxPwd must be the same as the tributary DBM s incoming password RxPwd The network can be tested by performin...

Page 205: ...ime Gen DTE Port EIA232 Set configuration options for automatic partial backup using the DBM V as follows Configuration Worksheet for Basic DBM V DBM S or DBM D Mode Diag DBM Diag Type Disr RemoteDiag...

Page 206: ...EIA232 RTS Cntrl DTE CTS Cntrl Std Bkup Auto Bckup Enab Backup Dir enter Dir number 1 to 10 BckupOnCMI Enab AutoRestor Enab NtwkTimOut enter 1 minute RestorTimOut enter 5 minutes TriesTimOut enter 1...

Page 207: ...nnected the pair of DBMs perform a handshake and exchange passwords then enter Data mode ready to send data After the tributary DSU DBM has set up the call each DSU switches the DTE s data to its DBM...

Page 208: ...e nondisruptive diagnostics configuration Please note that all DBM Ss here should be configured the same only the passwords and telephone numbers should differ The same holds true for the tributary DS...

Page 209: ...56 TxClkSource DDS AggrSwitch Disab Diag DSU Diag Type NonD Disr Type Br56 Diag DBM Diag Type NonD RemoteDiag Enhan Diag Gen Position Trib LinkConfig M Pt Resp Period 1 M Pt SymPrt Disab DBM PrtSp Kbp...

Page 210: ...ol DSU and a Tributary Time out alarm for each tributary DSU and DBM It is assumed that a failure in the DDS network is not between the control DSU and the central office The control DSU still receive...

Page 211: ...Configuration Scenarios D 15 3610 A2 GB41 70 July 1999 Figure D 7 Extended Bridge Configuration Automatic Partial Backup Dial Backup Not Active...

Page 212: ...COMSPHERE 3600 Series Data Service Units D 16 July 1999 3610 A2 GB41 70 Figure D 8 Extended Bridge Configuration Automatic Partial Backup Active Dial Backup Active for All Drops...

Page 213: ...Configuration Scenarios D 17 3610 A2 GB41 70 July 1999 Figure D 9 Extended Bridge Configuration Automatic Partial Backup Active Dial Backup Active for Two Drops...

Page 214: ...ommunicating when the switch occurs Pertinent configuration options for the central site bridge and the extended bridge that support the configuration scenario just described follow The configuration...

Page 215: ...tributary DSUs are configured for nondisruptive diagnostics with a 400 bps in band secondary channel transport speed Seven central site DBM Vs are dedicated to the control DSU and are connected to it...

Page 216: ...COMSPHERE 3600 Series Data Service Units D 20 July 1999 3610 A2 GB41 70 Figure D 10 NMS Controlled Full Backup Configuration Dial Backup Not Active...

Page 217: ...Configuration Scenarios D 21 3610 A2 GB41 70 July 1999 Figure D 11 NMS Controlled Full Backup Configuration Dial Backup Active...

Page 218: ...backup circuit and the host computer can restart the network polling When backup is completed the FEP line may be restarted if necessary During backup the DSU still reports the facility alarm to the N...

Page 219: ...nD 2nd Ch bps 400 Disr Type 3600 Diag Gen Position Cntrl LinkConfig M Pt Trib TimOut enter amount of time Diag Conn CC M Pt SymPrt Disab Gen DTE Port V 35 Set the extended bridge configuration options...

Page 220: ...RTS Cntrl FrcOn CTS Cntrl Std Bkup Auto Bckup Disab AutoRestor Disab Set the configuration options for multipoint full dial backup of a tributary DSU as follows Configuration Worksheet for Basic Mode...

Page 221: ...s services automated teller machines ATMs Channel C In addition the low speed application extended via the FEP port sharing feature of the control DSU and a dedicated multipoint circuit services sever...

Page 222: ...COMSPHERE 3600 Series Data Service Units D 26 July 1999 3610 A2 GB41 70 Figure D 12 MCMP using FEP Port Sharing Configuration...

Page 223: ...to the extended bridge The central site DBM Ss are configured for disruptive diagnostics Diag Type Disr The extended bridge is configured to operate at 56 kbps automatically taking its timing from any...

Page 224: ...the Standby Facility State field command followed by a dial and a q command in the Number to Dial field to each DBM S associated with the digital bridge To end the backup session via the SDCP address...

Page 225: ...Del 0 DTR Alarm Disab DSU TxElastStor Enab AggrSwitch Disab Diag DSU Diag Type Disr Disr Type 3600e Diag Gen Position Cntrl LinkConfig M Pt Gen DTE Port V 35 Set configuration options for automatic p...

Page 226: ...e DBM s are configured for 14 4 kbps Excess bandwidth must be reserved on the backup configuration so that framing and diagnostic data does not reduce the port speeds Therefore the DBM port speeds are...

Page 227: ...us use the Sharing Device configuration options Upstream switched carrier configurations must be set TxCarrSel set to Cntrl and RxCarrSel set to Cntrl or Mark in TDM mode use the system default settin...

Page 228: ...Gen Position Cntrl for control Trib for tributary LinkConfig M Pt DBM Rate Kbps N A for control 14 4 for tributary TxClkSource N A for control RXC for tributary CarrLossDisc N A for control Yes for tr...

Page 229: ...Sel Const RTS CTS Del 0 DTR Alarm Disab AntiStream Disab PrtSp DSU Prt1 7 2 Prt2 7 2 Prt3 4 8 Prt4 4 8 Prt5 and Prt6 Disab Diag DSU Diag Type NonD 2nd Ch bps 40 Disr Type 3600e Diag Gen Position Cntrl...

Page 230: ...COMSPHERE 3600 Series Data Service Units D 34 July 1999 3610 A2 GB41 70...

Page 231: ...ynchronous operation 1 3 1 4 sources 4 6 automatic DDS restoration 4 47 partial backup D 6 D 7 D 15 active D 16 D 17 extended bridge D 14 B backup aggregate switched MCMP circuits 4 34 TDM circuit 4 2...

Page 232: ...MP 4 26 management 4 23 speeds 1 4 4 23 underspeed 4 6 circuit backbone TDM 4 11 quality 5 11 measurements 5 11 COMSPHERE 3000 Series Carrier rear 3 10 configuration branch 5 7 5 31 options 3 4 mode o...

Page 233: ...lity 1 5 configuration scenarios D 6 connector C 5 non modular TDM MCMP C 5 DBM V DBM S DBM D interface 4 46 switched LSD operation 4 46 DCE interface 4 33 DSU interface 4 52 inactive central site bri...

Page 234: ...ring 1 3 1 4 4 14 4 15 4 32 backup D 30 configuration dial backup active D 31 MCMP 4 27 D 25 D 26 flex interface switch 2 6 framing bit 4 6 in band 4 6 management channel 4 23 front panel model 3611 5...

Page 235: ...ve D 31 flex 2 port 6 port 1 4 independent channels 4 26 initialization 4 25 LPDA 2 interoperability 1 5 mode 4 4 multiplexing 4 56 4 57 operation 4 25 overhead composition 4 23 signal flow 4 24 statu...

Page 236: ...3 1 5 4 52 full backup configuration D 20 full backup configuration D 21 software configuration 2 11 3 4 non modular carrier mounted pin locations C 8 DSU with TDM MCMP 3 2 TDM connector C 2 TDM MCMP...

Page 237: ...software configuration DCP or NMS 2 10 SDCP 3 4 speeds channel 4 23 characteristics 4 6 line 4 23 standard features 1 2 status branch 5 7 5 8 codes DTE lead 5 10 indicators 5 3 DBM V DBM S DBM D 5 6 D...

Page 238: ...7 5 14 device 5 15 digital 5 25 end to end 5 27 lamp 5 31 results bit error rate 5 29 digital 5 27 end to end 5 28 transmission multipoint 4 3 point to point 4 2 transmitter control 5 44 tributary add...

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