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Testing

 5-4

7520-A2-GB20-20

May 1998

CSU or External Network Loopback

CSU loopback is an external loopback that is located as closely as possible to the
network interface.

Procedure

To run a CSU loopback:

1. Position the cursor at the Start command next to CSU Loopback on the

Network Tests screen.

2. Press Enter.

3. The Start command is changed to Stop. If you want to manually stop the test,

verify that the cursor is positioned at the Stop command.

4. Press Enter. The duration of the test is displayed.

DSU

CSU

DTE

Interface

Aggregate

DTE

Port

DDS
Network
Port

496-15144

CSU Loopback

Summary of Contents for 7520

Page 1: ...MODEL 7520 DSU USER S GUIDE Document No 7520 A2 GB20 20 May 1998...

Page 2: ...ke changes from time to time in the contents hereof without obligation of Paradyne Corporation to notify any person of such revision or changes Changes and enhancements to the product and to the infor...

Page 3: ...Configurations 1 2 User Interfaces 1 3 Rear Panel Interfaces 1 4 2 Using the Asynchronous Terminal Interface Connecting to the Terminal Port 2 1 Initiating an ATI Session 2 2 Screen Format Types 2 3...

Page 4: ...f Test Results 4 4 Test Status Messages 4 5 Viewing Network Interface Status 4 6 Viewing Network Performance Statistics 4 7 Monitoring the LEDs 4 8 System LEDs 4 9 Network LEDs 4 10 Port LEDs 4 11 5 T...

Page 5: ...rview A 1 System Options Menu A 2 Network Interface Options Menu A 4 Data Port Options Menu A 5 Terminal Port Options A 8 B Worksheets Overview B 1 Configuration Worksheets B 1 C Cables and Pin Assign...

Page 6: ...Contents iv 7520 A2 GB20 20 May 1998 This page intentionally left blank...

Page 7: ...iguration Chapter 4 Monitoring the DSU Describes monitoring the DSU using the LEDs DSU status and network statistics Chapter 5 Testing Provides details about available tests and test setup Chapter 6 M...

Page 8: ...epts and sections in alphabetical order Product Related Documents Document Number Document Title 7520 A2 GN10 Model 7520 DSU Startup Instructions Contact your sales or service representative to order...

Page 9: ...ation Operates at 2 4 4 8 9 6 19 2 38 4 56 and 64 kbps full duplex as a limited distance modem Asynchronous Terminal Interface ATI Provides a menu driven VT100 compatible interface for configuring and...

Page 10: ...the DSU at each location provide the LAN interconnection DDS Network 97 15084 02 DSU DSU Router Router The DSU can also be used in a Frame Relay network Frame Relay Network 97 15271 01 DSU DSU Router...

Page 11: ...driven Asynchronous Terminal Interface ATI screens see Chapter 2 Using the Asynchronous Terminal Interface Front panel LED status indicators see Chapter 4 Monitoring the DSU 97 15786 Network System P...

Page 12: ...shows the physical interfaces of the DSU Information about the installation of the DSU is contained in the Model 7520 DSU Startup Instructions 97 15781 RJ48S Jack NETW ORK TERMIN AL MANAGEMENT POW ER...

Page 13: ...T100 compatible async terminal or a PC running emulation software The terminal or PC can be connected to the Terminal port directly or through an external modem Ensure that the device you connect comm...

Page 14: ...st Configuration Control Ctrl a to access these functions Exit Entry to all of the DSU s tasks begins at the Main Menu screen which has four menus or branches Select To Status View results of diagnost...

Page 15: ...pes of screen formats are available on the ATI Use the screen format To Menu selection Display a list of available functions for user selection Input Add or change information on a screen Input or edi...

Page 16: ...a Port Options Screen function key area This is the area below the dotted line that lists function keys specific to the screen field value choices and system messages Menu Path Screen Function Keys Fi...

Page 17: ...rsor to the previous field Spacebar Select the next valid value for the field Delete Del Delete character that the cursor is on Up Arrow or Ctrl u Move cursor up one field within a column on the same...

Page 18: ...ssing the space bar to scroll through other valid values Screen Function Keys All screen function keys located below the dotted line operate the same way upper or lowercase throughout the screens For...

Page 19: ...elect either the function s designated underlined character or press the tab key until you reach the desired function key Example To reset the Monitor 511 error counter to zero type r or R ResetMon 3...

Page 20: ...to terminate the session Procedure To end an ATI session 1 Press Ctrl a to go to the screen function key area below the dotted line 2 Save changes if required A confirmation message appears if you hav...

Page 21: ...VICE NAME Device Name Node A Clear System Name ________________________________________ Clear System Location ________________________________________ Clear System Contact ____________________________...

Page 22: ...sible for the unit The maximum length of System Contact is 127 characters 5 Save the Device Name screen information as shown in the next section Saving Configuration Options When changes are made to t...

Page 23: ...Configuration The DSU s active set of configuration options Default Factory Configuration A read only configuration area containing the factory default configuration options If the factory default se...

Page 24: ...Customizing the DSU 3 4 7520 A2 GB20 20 May 1998 This page intentionally left blank...

Page 25: ...and Status message on the last line of all screens Network Interface Status screen Network Performance Statistics screen LEDs on the ATI Status screen or the DSU s front panel Table 4 1 shows the ava...

Page 26: ...rently active tests Refer to Table 4 4 Test Status Messages main status system Device Name Node A Model 7520 SYSTEM AND TEST STATUS HEALTH AND STATUS SELF TEST RESULTS TEST STATUS Cross Pair Detection...

Page 27: ...are on and Network Performance Statistics are active 1 Verify that the remote site is in service 2 Contact network provider Out of Frame hhh mm ss1 DSU is detecting an out of frame condition associate...

Page 28: ...are no status messages to display No action needed Self Test Results The results of the last power up or reset self test appear in the middle column of the System and Test Status screen Table 4 3 Sel...

Page 29: ...on codes stop If the network service is 64 kbps CC the network loopback is latching This condition can only occur when the Network Interface option Network initiated DSU Loopback 64K CC is enabled Ref...

Page 30: ...etwork interface status fields are read only Table 4 5 describes the contents of the Network Interface Status screen Table 4 5 Network Interface Status Screen Contents Field Status What the Status Ind...

Page 31: ...menu MainMenu Exit Refresh ClrStats All counts show the number of occurrences since the last reset of the counters No Signal Count is the number of occurrences of a No Signal condition Out of Service...

Page 32: ...terface Port LEDs display the activity on the selected user data DTE port To view the LED status screen follow this menu selection sequence Main Menu Status Display LEDs main status leds Device Name M...

Page 33: ...work System Port red green yellow OK ON DSU is operational OFF DSU is performing a power up self test has detected a system failure or there is no power ALARM ON DSU has detected an alarm condition lo...

Page 34: ...sending or receiving data or is in DMI condition all 1s being received OFF DDS network interface is receiving CMI codes OOS Out of Service ON DSU is receiving out of service code from the remote unit...

Page 35: ...1s from the DTE Blinking User data is being transferred RXD Received Data ON Sending all 0s to the DTE OFF Sending all 1s to the DTE Blinking User data is being transferred RTS Request to Send ON DTE...

Page 36: ...Monitoring the DSU 4 12 7520 A2 GB20 20 May 1998 This page intentionally left blank...

Page 37: ...selection sequence Main Menu Test main test Device Name Model 7520 TEST Network Tests Data Port Tests Lamp Test Abort All Tests Ctrl a to access these functions Exit The DSU supports independent test...

Page 38: ...oopback cannot be disabled by the user Local Loopback User DTE via CT141 Control via CT141 can be disabled Refer to Table A 3 Data Port Options Network initiated 2 4 56 kbps DSU Loopback Non latching...

Page 39: ...SU Loopback Start Inactive 0 00 00 DSU Loopback Start Inactive 0 00 00 Send V 54 Up Send Inactive Send V 54 Down Send Inactive Send 511 Start Inactive 0 00 00 Monitor 511 Stop Active 125 08 48 Errors...

Page 40: ...a CSU loopback 1 Position the cursor at the Start command next to CSU Loopback on the Network Tests screen 2 Press Enter 3 The Start command is changed to Stop If you want to manually stop the test ve...

Page 41: ...DSU can send an ITU T V 54 Up or Down sequence to request the activation or termination of a DSU digital loopback of a remote unit This is the same as the DSU Loopback shown above except the test is...

Page 42: ...of the test is displayed Procedure To run a Monitor 511 test 1 Position the cursor at the Start command next to Monitor 511 on the Network Tests screen 2 If desired use Ctrl a to switch to the screen...

Page 43: ...Port Tests screen follow this menu selection sequence Main Menu Test Data Port Tests main test port Device Name Node A Model 7520 DATA PORT TESTS Test Command Status Result Local Loopback Start Inact...

Page 44: ...hat the cursor is positioned at the Stop command 4 Press Enter The duration of the test is displayed DSU CSU DTE Interface Aggregate DDS Network Port 496 15145 DTE Port Local Loopback 511 Test Pattern...

Page 45: ...ment to provide the clock for the 511 pattern on the interchange circuit CT113 TT for timing the incoming pattern Refer to V 35 User Data Port Connector in Appendix C Cables and Pin Assignments Runnin...

Page 46: ...Test Timeout does not pertain to tests commanded by the Network such as the network initiated CSU and DSU Loopbacks DTE such as the DTE initiated Local Loopback On each test screen is a command colum...

Page 47: ...e 6 1 Device Messages 1 of 2 Device Message What Message Indicates What To Do Command Complete Action requested has successfully completed No action needed Invalid Character x A nonprintable ASCII cha...

Page 48: ...lected Wait until other test ends and message clears Abort all tests from the Test menu screen Stop the test from the same screen the test was started from Please Wait Command takes longer than 5 seco...

Page 49: ...elf Test results The DSU detects an internal hardware failure Power the DSU off and on and try again Contact your service representative An LED is not lit LED is burned out Run the Lamp test If the LE...

Page 50: ...3 in Appendix A Data Port Options is the same one that is physically connected to a DTE Run Loopback tests Refer to Running Network Tests in Chapter 5 Power Up Self Test fails Only Alarm LED is on af...

Page 51: ...System System Options Table A 1 General system options Network Network Interface Options Table A 2 DDS network interface Data Port Data Port Options Table A 3 User data on DTE port Terminal Port Termi...

Page 52: ...s set to DDS 2 4 to 56 2 4 to 56 kbps line rate 64CC 64 kbps Clear Channel on a 72 kbps circuit LADS Timing Possible Settings Internal External Receive Default Setting Internal Determines the timing s...

Page 53: ...Tests must be terminated manually from the Network Tests screen Refer to Running Network Tests in Chapter 5 NOTE Tests commanded by the DTE or network initiated tests are not affected by this test tim...

Page 54: ...a latching DSU loopback Disable DSU will not respond to a DSU loopback initiated by the network Data Scrambling 64K CC Possible Settings Enable Disable Default Setting Disable Determines whether data...

Page 55: ...T103 Transmitted Data TXD The feature should be enabled when data errors are occurring due to long cable lengths Enable The DSU supplied clock is phase inverted with respect to the transmitted data TX...

Page 56: ...ol Possible Settings Standard Follow RTS Forced On Circuit Assurance Short Delay Medium Delay Long Delay Default Setting Standard Specifies the operation of the Interchange Circuit CT106 Clear to Send...

Page 57: ...he operation of the Interchange Circuit CT107 Data Set Ready DSR which is an output from the DSU Standard DSR is always asserted except when a DDS facility alarm is reported or the DSU is in Test mode...

Page 58: ...e Provides automatic logoff of an ATI session through the Terminal Port When the session is closed User Interface Idle appears on the screen and the unit toggles the Terminal port DSR lead Enable The...

Page 59: ...ion Worksheets System Configuration Option Settings Default in Bold Operating Mode DDS LADS DDS Line Rate Kbps 2 4 4 8 9 6 19 2 38 4 56 64CC LADS Timing Internal External Receive LADS Line Rate Kbps 2...

Page 60: ...Both Bilateral Loopback Enable Disable Carrier Control by RTS Constant Switched CTS Control Standard Follow RTS Forced On Circuit Assurance RLSD Control Standard Forced On DSR Control Standard Forced...

Page 61: ...signments C Overview The following sections provide pin assignments for the Terminal Port EIA 232 Connector EIA 232 User Data Port Connector V 35 User Data Port Connector Standard EIA 232D Crossover C...

Page 62: ...ts to a PC or VT100 compatible terminal Signal Direction Pin Transmit Data TXD To DSU In 2 Received Data RXD From DSU Out 3 Request to Send RTS To DSU In 4 Clear to Send CTS From DSU Out 5 Data Set Re...

Page 63: ...05 To DSU In 4 Clear to Send CTS 106 From DSU Out 5 Data Set Ready DSR 107 From DSU Out 6 Signal Ground Common 102 7 Received Line Signal Detector Carrier Detect RLSD CD 109 From DSU Out 8 Transmitter...

Page 64: ...Set Ready DSR 107 From DSU Out E Received Line Signal Detector RLSD or LSD 109 From DSU Out F Data Terminal Ready DTR 108 1 2 To DSU In H Remote Loopback RL 140 To DSU In N Local Loopback LL 141 To DS...

Page 65: ...nal modem Pin 1 Pin 14 Pin 13 Pin 25 Pin 1 Pin 14 Pin 13 Pin 25 P2 Plug Chassis Ground TXD RXD RTS DSR Signal Ground CD RLSD RXC DTR XTXC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24...

Page 66: ...work access is via a 14 foot modular cable with an RJ48S keyed plug connector on each end RJ48S DDS Network Interface Cable Functions Circuit Pin Transmitted data to the local loop R 1 Transmitted dat...

Page 67: ...FCC Part 15 FCC Part 68 Safety Certifications Emissions Class A digital device Refer to the equipment s label for Registration Number Refer to the equipment s label for approvals on product Class A di...

Page 68: ...DSU LADS Connection Distances Wire Diameter AWG Data Rate kbps 19 Gauge 0359 or 9122 mm 22 Gauge 0253 or 643 mm 24 Gauge 0201 or 511 mm 26 Gauge 0159 or 404 mm 2 4 20 0 mi 32 2 km 16 6 mi 26 7 km 12...

Page 69: ...ng sent Communications port A computer s serial communications port used to transmit to and receive data from a DCE The DCE connects directly to this port Device software that sets specific operating...

Page 70: ...tions simultaneously High Level Data Link Control A communications protocol defined by the International Standards Organization ISO A shared boundary between functional units International Telecommuni...

Page 71: ...available routes An EIA standard for the 25 pin DCE DTE interface Same as EIA 232 Request to Send An EIA lead standard for V 24 circuit CT 105 an input signal DTE to DCE Receive To obtain transmitted...

Page 72: ...ssary GL 4 7520 A2 GB20 20 May 1998 Wide Area Network A network that operates over long distances and spans a relatively large geographic area e g a country A random bit test 511 bytes in length WAN 5...

Page 73: ...3 rear panel C 1 V 35 DTE C 4 Control menu 3 1 6 4 crossover EIA 232 cable C 5 CTS clear to send LED 4 11 Control option A 6 customer configuration areas 3 3 D data port options A 5 tests 5 7 Data Por...

Page 74: ...s 2 5 L LADS Local Area Data Set example 1 2 maximum distances 1 2 Operating Mode setting A 2 LADS Line Rate Kbps System option A 2 LADS Timing System option A 2 lamp test 5 9 LEDs 4 8 4 11 front pane...

Page 75: ...e 6 1 no data 6 3 6 4 R rear panel connections 1 4 reset device 6 4 revision numbers 6 4 RJ48S network interface cable C 6 RLSD Control option A 6 RTS Carrier Control option A 6 request to send LED 4...

Page 76: ...3 Test menu 5 1 5 3 5 7 5 9 Test Timeout System option A 3 testing 4 1 5 1 timeout for ATI A 8 for tests A 3 Transmit Clock Data Port option A 5 troubleshooting 6 3 TXD transmitted data LED 4 11 user...

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