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Paradyne 7520 User Manual

Zhone 7520 dsu: users guide
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MODEL 7520 DSU
USER'S GUIDE
Document No. 7520-A2-GB20-20
May 1998

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Summary of Contents for Paradyne 7520

  • Page 1 MODEL 7520 DSU USER’S GUIDE Document No. 7520-A2-GB20-20 May 1998...
  • Page 2 Via the Internet: Visit the Paradyne World Wide Web site at http://www.paradyne.com Via Telephone: Call our automated call system to receive current information via fax or to speak with a company representative. — Within the U.S.A., call 1-800-870-2221 — Outside the U.S.A., call 1-727-530-2340 Printed on recycled paper May 1998 7520-A2-GB20-20...

  • Page 3: Table Of Contents

    Contents About This Guide Document Purpose and Intended Audience Document Summary Product-Related Documents About the DSU Model 7520 DSU Features Typical DSU Configurations User Interfaces Rear Panel Interfaces Using the Asynchronous Terminal Interface Connecting to the Terminal Port Initiating an ATI Session...
  • Page 4 ..........May 1998 ....4-10 4-11 5-10 7520-A2-GB20-20...
  • Page 5 Glossary Index 7520-A2-GB20-20 ..............
  • Page 6 Contents This page intentionally left blank. May 1998 7520-A2-GB20-20...

  • Page 7: About This Guide

    About This Guide Document Purpose and Intended Audience This guide contains information needed to set up, configure, and operate the Model 7520 DSU and is intended for installers and operators. Document Summary Section Chapter 1 Chapter 2 Chapter 3 Chapter 4...

  • Page 8: Product-Related Documents

    Paradyne documents are also available on the World Wide Web at: http://www.paradyne.com Select Service & Support Description Defines acronyms and terms used in this document. Lists key terms, acronyms, concepts, and sections in alphabetical order. Document Title Model 7520 DSU Startup Instructions Technical Manuals May 1998 7520-A2-GB20-20...

  • Page 9: About The Dsu

    About the DSU Model 7520 DSU Features The Model 7520 DSU provides an interface between the customer premises equipment (CPE) and a Digital Data Service (DDS) network. The DSU’s features and capabilities include: Easy Installation. Connects to your equipment using standard connectors and cables.

  • Page 10: Typical Dsu Configurations

    Router Two DSUs can be connected back-to-back to act as Local Area Data Sets. Router Table D-2 Network Frame Relay Network in Appendix D shows the maximum distances for LADS applications. May 1998 Router 97-15084-02 Router 97-15271-01 Router 97-15236-02 7520-A2-GB20-20...

  • Page 11: User Interfaces

    There are two types of user interfaces for the DSU: Menu-driven Asynchronous Terminal Interface (ATI) screens (see Chapter 2, Using the Asynchronous Terminal Interface Monitoring the DSU Front panel LED status indicators (see Chapter 4, 7520 DSU System Network Port 97-15786...

  • Page 12: Rear Panel Interfaces

    About the DSU Rear Panel Interfaces The following illustration shows the physical interfaces of the DSU. Information about the installation of the DSU is contained in the Model 7520 DSU Startup Instructions . AC Adapter Terminal Connection EIA-232 V.35 Connection...

  • Page 13: Using The Asynchronous Terminal Interface

    Ensure that the device you connect communicates using these settings: Data rate set to 9.6 kbps. Character length set to 8. Parity set to None. Stop Bits set to 1. Terminal port settings cannot be changed using the ATI. 7520-A2-GB20-20 May 1998...

  • Page 14: Initiating An Ati Session

    View results of diagnostic tests, network status of interfaces, statistics, LEDs, and DSU identity information. Select and cancel tests for the DSU’s interfaces. Establish identification for the DSU and system, or to initiate a power-up reset of the DSU. May 1998 Model: 7520 Î Î Exit 7520-A2-GB20-20...

  • Page 15: Screen Format Types

    What Affects Screen Displays What appears on the screens depends on the: Current configuration – How the DSU is currently configured. Data selection criteria – What you entered in previous screens. 7520-A2-GB20-20 Using the Asynchronous Terminal Interface MAIN MENU Status...
  • Page 16 Invert Transmit Clock: Disable Port (DTE) Initiated Loopbacks: Disable Bilateral Loopback: Disable Carrier Control by RTS: Constant CTS Control: Standard RLSD Control: Standard DSR Control: Standard Monitor DTR: Enable System Messages May 1998 Model: 7520 Input Fields MainMenu Exit No Signal 7520-A2-GB20-20...

  • Page 17: Navigating The Screens

    2. Press Enter. The selected menu or screen appears. 3. Continue Steps 1 and 2 until you reach the screen you want. 7520-A2-GB20-20 Using the Asynchronous Terminal Interface To . . . Move cursor between the screen area and the screen function keys area below the dotted line at the bottom of the screen.

  • Page 18: Screen Function Keys

    D or d Display the next page. U or u Display the previous page. S or s Save information. R or r Update screen with current information. R or r Reset an active Monitor 511 test counter to zero. May 1998 7520-A2-GB20-20...

  • Page 19: Switching To The Screen Function Key Area

    Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î 7520-A2-GB20-20 Using the Asynchronous Terminal Interface NETWORK TESTS Command Status Result Start Inactive 0:00:00 Start Inactive 0:00:00 Send Inactive Inactive Start Inactive 0:00:00 Stop Active 125:08:48 May 1998 Model: 7520 Errors 99999+ MainMenu Exit...

  • Page 20: Ending An Ati Session

    2. Save changes if required. A confirmation message appears if you have made but not saved changes to your configuration. 3. Tab to Exit (or type e or E) and press Enter. The User Interface Idle screen appears. May 1998 7520-A2-GB20-20...

  • Page 21: Customizing The Dsu

    Use the left and right arrow keys to scroll through the fields. Select Clear to reset a field to a null value. 7520-A2-GB20-20 Control Device Name DEVICE NAME Node A ________________________________________ ________________________________________ ________________________________________ May 1998 Model: 7520 Clear Clear Clear Clear Î Î Î Î MainMenu Exit...

  • Page 22: Saving Configuration Options

    When Exit is selected before Save, a Save Configuration screen appears requiring a Yes or No response. If you select . . . Then . . . The Save Configuration To screen appears. The Main Menu appears and changes are not saved. May 1998 7520-A2-GB20-20...

  • Page 23: Configuring The Dsu

    The selected configuration option set is loaded and the Configuration Edit/Display menu screen appears. See Appendix A, configuration options available. 7520-A2-GB20-20 Configuration Option Configuration Option Set The DSU’s active set of configuration options. A read-only configuration area containing the factory default configuration options.
  • Page 24 Customizing the DSU This page intentionally left blank. May 1998 7520-A2-GB20-20...

  • Page 25: Monitoring The Dsu

    Table 4-1 shows the available indicators of alarm conditions on the network interface and the User Data port. Table 4-1. Alarm Indicator Locations Alarm Condition Crossed Pairs No Signal (NS) Out of Service (OOS) Out of Frame (OOF) Excessive Bipolar Violations (BPV) 7520-A2-GB20-20 May 1998 Status Specific Screen...

  • Page 26: Viewing System And Test Status

    SELF-TEST RESULTS Device Fail Memory Fail Passed ESC for previous menu Clear May 1998 Test Status Model: 7520 TEST STATUS No Test Active CSU Loopback Active Network-init. CSU LB Active DSU Loopback Active Network-init. DSU LB Active V.54-initiated DSU LB Active...

  • Page 27: Health And Status

    User Data Port DTR Off hhh:mm:ss indicates the amount of time the condition has existed in hours, minutes, and seconds. When the maximum time has been exceeded, 255:59:59+ appears. 7520-A2-GB20-20 What Message Indicates The DDS Receive (RX) and Transmit (TX) pairs are crossed on the network interface.

  • Page 28: Self-Test Results

    What To Do 1. Reset the DSU and try again. 2. Use the Clear command to clear the message. 3. Call your service 3 Call your service representative for assistance if the message reappears. No action needed. 7520-A2-GB20-20...

  • Page 29: Test Status Messages

    Sending 511 on Network Monitoring 511 on Network Lamp Test Active 7520-A2-GB20-20 in the following table appear in the right column of the Meaning Status message, indicating no local, remote, or network test in progress. A CSU Loopback toward the network is currently active.

  • Page 30: Viewing Network Interface Status

    0 to – 65 dB Amount of loop loss. The loss of signal strength of the receive line signal from the local loop, measured in decibels. Inoperative The line may be disconnected. May 1998 Model: 7520 Î Î Î Î MainMenu Exit 7520-A2-GB20-20...

  • Page 31: Viewing Network Performance Statistics

    No Signal Count: 101920 Out of Service Count: Out of Frame Count: Excessive BPV Count: 99830 Invalid BPV Count: 87409 ESC for previous menu ClrStats May 1998 Monitoring the DSU Model: 7520 26:33:08 0:00:00 8:53:49 144:28:11 Î Î Î Î MainMenu Exit...

  • Page 32: Monitoring The Leds

    When viewed via the ATI, the status display screen is updated approximately every 5 seconds. Use Refresh to obtain a current status of all LEDs. Status Display LEDs DISPLAY LEDS SYSTEM NETWORK ALARM TEST ESC for previous menu May 1998 Model: 7520 Î Î Î Î MainMenu Exit 7520-A2-GB20-20...

  • Page 33: System Leds

    System LEDs ON – DSU is operational. OFF – DSU is performing a power-up self-test, has detected a system 7520-A2-GB20-20 failure, or there is no power. ALARM: ON – DSU has detected an alarm condition locally or from the network. Refer to...

  • Page 34: Network Leds

    NS – No Signal: ON – DDS network interface detects System Network green yellow May 1998 Health and Status condition. Refer to Table 4-2, Health and Status Messages. no signal. Refer to Table 4-2, Health and Status Messages. Port 496-15062 7520-A2-GB20-20...

  • Page 35: Port Leds

    – Receiving all 0s from the DTE. – Receiving all 1s from the DTE. Blinking – User data is being transferred. RXD – Received Data: Blinking – User data is being transferred. 7520-A2-GB20-20 System Network green yellow – Sending all 0s to the DTE.
  • Page 36 Monitoring the DSU This page intentionally left blank. 4-12 May 1998 7520-A2-GB20-20...

  • Page 37: Testing

    The CSU and DSU loopbacks and 511 test pattern send/monitor are supported on the network interface. The Local Loopback and 511 test pattern send/monitor are supported on the DTE port. 7520-A2-GB20-20 Test TEST Network Tests Data Port Tests Lamp Test Abort All Tests May 1998 Model: 7520 Exit...
  • Page 38 V.54 sequence. Can be disabled locally. Refer to Table A-2, Network Interface User Control via CT140 can be disabled. Refer to Table A-3, DTE via CT140 May 1998 Data Port Data Port Options. Network Options. Data Port Options. 7520-A2-GB20-20...

  • Page 39: Running Network Tests

    511 test is active, ResetMon is available to reset the error counter to zero. 7520-A2-GB20-20 Test Network Tests NETWORK TESTS Command Status Result Start Inactive 0:00:00 Start Inactive 0:00:00 Send Inactive Inactive Start Inactive 0:00:00 Stop Active 125:08:48 May 1998 Testing Model: 7520 Errors 99999+ MainMenu Exit...

  • Page 40: Csu Or External Network Loopback

    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. Port Aggregate Interface CSU Loopback May 1998 Network Port 496-15144 7520-A2-GB20-20...

  • Page 41: Dsu Or Internal Network Loopback

    Sending appears in the Status column followed (after a few seconds) by Command Complete at the bottom of the screen. Refer to Running Network Tests Tests screen. 7520-A2-GB20-20 Aggregate Interface DSU Loopback on page 5-3 for an example of the Network...

  • Page 42: 511 Test Pattern For The Network

    4. 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. 5. Press Enter. The duration of the test is displayed. Refer to Running Network Tests Tests screen. on page 5-3 for an example of the Network May 1998 7520-A2-GB20-20...

  • Page 43: Running Data Port Tests

    Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î 7520-A2-GB20-20 Test Data Port Tests DATA PORT TESTS Command Status Start Inactive Start Inactive Stop Active May 1998 Testing Running Network Model: 7520 Result 000:00:00 000:00:00 255:59:59+ – Errors 99999+ MainMenu Exit...

  • Page 44: Local Loopback

    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. Interface Aggregate Local Loopback May 1998 Network Port 496-15145 7520-A2-GB20-20...

  • Page 45: Running The Lamp Test

    2. Press Enter. 3. The Start command is changed to Stop. When you want to stop the test, verify that the cursor is positioned at the Stop command. 4. Press Enter. 7520-A2-GB20-20 in Appendix C, Cables and Pin Test Lamp Test...

  • Page 46: Ending An Active Test

    Use the Abort All Tests selection from the Test menu to stop all tests running on all interfaces, with the exception of network or DTE-initiated loopbacks. Command Complete appears when all tests on all interfaces have been terminated. 5-10 System Options. May 1998 7520-A2-GB20-20...

  • Page 47: Messages And Troubleshooting

    Invalid – Network Initiated CSU (or DSU) Loopback Active Invalid – [ Test ] Already Active 7520-A2-GB20-20 in Table 6-1, listed in alphabetical order, may appear in the What Message Indicates What To Do Action requested has No action needed.
  • Page 48 Wait until the other test ends and message clears. Cancel all tests from the Test screen. Stop the test from the same screen the test was started from. May 1998 7520-A2-GB20-20...

  • Page 49: Troubleshooting

    Test Status screen under Self-Test results. An LED is not lit. No power, or the LEDs are not lit. Excessive data errors. 7520-A2-GB20-20 Messages and Troubleshooting Possible Cause Solutions One of several alarm Refer to Table 4-2, conditions exists. Health Status...

  • Page 50: Resetting The Dsu

    Running Network Tests Chapter 5. The DSU has detected an Reset the DSU and try again. internal hardware failure. Contact your service representative. Control Reset Device Messages. Status Identity May 1998 Model 7520 DSU Distances. Options) is the same 7520-A2-GB20-20...

  • Page 51: Configuration Option Tables

    NOTE: All changes to configuration options must be saved. Refer to Configuration Options MAIN MENU Status Test Configuration Control 7520-A2-GB20-20 To Access the . . . System Options, Table A-1 Network Interface Options, Table A-2 Data Port Options, Table A-3...

  • Page 52: System Options Menu

    Default Setting: 9.6 Sets the line operating rate for LADS operation. LADS Line Rate (Kbps) option appears when Operating Mode is set to LADS. 2.4 to 64 – DSUs communicate at this line rate. Configuration (Load Configuration From) System May 1998 7520-A2-GB20-20...
  • Page 53 Test Duration (min) option appears when Test Timeout is enabled. 1 to 120 – Amount of time in minutes for a user-initiated test to run before terminating. 7520-A2-GB20-20 in Chapter 5. Tests commanded by the DTE or network-initiated tests are not affected by this test timeout.

  • Page 54: Network Interface Options Menu

    Enable – DSU loopback can be initiated or terminated by a remote unit sending in-band V.54 Loop 2 Up or Down sequences. Disable – V.54 Loop 2 sequences are ignored. Configuration (Load Configuration From) Network Operating Mode May 1998 Operating Mode is set to DDS 7520-A2-GB20-20...

  • Page 55: Data Port Options Menu

    Circuit RL (CT140), as specified by V.54. The remote equipment must be able to detect the in-band V.54 loopback sequence. Both – Both the local and remote loopbacks can be controlled by the DTE. 7520-A2-GB20-20 Configuration (Load Configuration From) Data Port...
  • Page 56 150 ms delay is inserted before CTS is turned on and after RTS is turned on. Long Delay – CTS operates as described for the Standard option except that a 500 ms delay is inserted before CTS is turned on and after RTS is turned on. May 1998 7520-A2-GB20-20...
  • Page 57 Enable – The DSU monitors the state of DTR on the DTE port and displays it on the System and Test Status screen. Disable – DTR is not monitored by the DSU. Use when a DTE does not provide the DTR lead at the interface. 7520-A2-GB20-20 May 1998...

  • Page 58: Terminal Port Options

    Timeout is based on no keyboard activity. Disconnect Time(minutes) option appears when Inactivity Timeout is enabled. 1 to 60 – The ATI user session is closed after the selected number of minutes. Configuration (Load Configuration From) Terminal Port May 1998 7520-A2-GB20-20...

  • Page 59: Worksheets

    Test Duration (min) Network Interface Configuration Option Network-initiated DSU Loopback (64K CC) Data Scrambling (64K CC) V.54 Initiated DSU Loopback 7520-A2-GB20-20 Settings [DDS], LADS 2.4, 4.8, [9.6], 19.2, 38.4, 56, 64CC [Internal], External, Receive 2.4, 4.8, [9.6], 19.2, 38.4, 56, 64 [Enable], Disable 1–120, [10]...
  • Page 60 Enable, [Disable] [Constant], Switched [Standard], Follow RTS, Forced On, Circuit Assurance [Standard], Forced On [Standard], Forced On, On During Test [Enable], Disable Settings [Enable], Disable Enable, [Disable] range 1 – 60 [5] May 1998 Default in [Bold] Default in [Bold] 7520-A2-GB20-20...

  • Page 61: Cables And Pin Assignments

    Cables and Pin Assignments 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 Cable Modular RJ48S DDS Network Interface Cable 7520-A2-GB20-20 May 1998...
  • Page 62 Data Terminal Ready ( DTR ) To DSU ( In ) Direction Pin # To DSU ( In ) From DSU ( Out ) To DSU ( In ) From DSU ( Out ) From DSU ( Out ) — From DSU ( Out ) May 1998 7520-A2-GB20-20...

  • Page 63: Eia-232 User Data Port Connector

    Data Terminal Ready ( DTR ) Remote Loopback ( RL ) Transmitter Signal Element Timing – DTE Source ( XTXC or TT ) Test Mode Indicator ( TM ) 7520-A2-GB20-20 Cables and Pin Assignments Direction CT # To DSU (In)

  • Page 64: V.35 User Data Port Connector

    P ( A ) S ( B ) R ( A ) T ( B ) U ( A ) W ( B ) V ( A ) X ( B ) Y ( A ) AA ( B ) 7520-A2-GB20-20...

  • Page 65: Standard Eia-232D Crossover Cable

    A standard crossover cable can be used to connect the Terminal port to an external modem. Pin 14 Pin 1 Pin 13 Pin 25 Chassis Ground Signal Ground CD (RLSD) 7520-A2-GB20-20 Plug XTXC May 1998 Cables and Pin Assignments Pin 1 Plug Pin 14 Pin 25...

  • Page 66: Modular Rj48S Dds Network Interface Cable

    RJ48S DDS Network Interface Cable Functions Transmitted data to the local loop Transmitted data to the local loop Received data from the local loop Received data from the local loop Circuit Pin # May 1998 7520-A2-GB20-20...
  • Page 67 Technical Specifications Table D-1. Model 7520 DSU Technical Specifications (1 of 2) Item Housing Height (including feet) Height (without feet) Width Depth (case) Depth (case and connectors) Weight Power Normal service voltage range Approvals FCC Part 15 FCC Part 68...
  • Page 68 Technical Specifications Table D-1. Model 7520 DSU Technical Specifications (2 of 2) Item Network Interface Data rates LADS data rates Services supported Network Compatibility ANSI T1.410-1992 and AT&T Technical Reference 62310-1993 Table D-2. Model 7520 DSU LADS Connection Distances Data Rate (kbps) 19.2...
  • Page 69 It also provides the signal conversion required for communication between the DTE and the network. Digital Data Service. Provides digital communication circuits. Data Mode. Data Mode Idle. Refers to a sequence of ones transmitted or received on the DDS network. 7520-A2-GB20-20 May 1998 GL-1...
  • Page 70 Used to test various portions of a data link in order to isolate an equipment or data line problem. A diagnostic procedure that sends a test message back to its origination point. Line Signal Detect. An EIA-lead standard for V.24 circuit CT 109; an output signal (DCE-to-DTE). GL-2 May 1998 7520-A2-GB20-20...
  • Page 71 DSU. Conversely, the DSU uses Pin 2 to receive data from the DTE. V.35 An ITU-T standard for a high-speed, 34-pin, DCE/DTE interface. V.54 An ITU-T standard for local and remote diagnostic loopback tests. V.54 Loop 2 An ITU-T standard for a data channel loopback (DCLB). 7520-A2-GB20-20 May 1998 Glossary GL-3...
  • Page 72 Glossary 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. GL-4 May 1998 7520-A2-GB20-20...
  • Page 73 1-2 option areas, 3-3 option tables, A-1 option worksheets, B-1 saving, 3-2 Configuration menu, 3-3 7520-A2-GB20-20 connectors EIA-232 DTE, C-3 rear panel, C-1 V.35 DTE, C-4 Control menu, 3-1, 6-4 crossover EIA-232 cable, C-5 clear to send LED, 4-11...
  • Page 74 2-5 network interface cable, C-6 interface LEDs, 4-10 interface status, 4-6 loopbacks, 5-4 performance statistics, 4-7 tests, 5-3 Network Interface Options, A-4 Network-initiated DSU Loopback, Network Interface option, A-4 NS, no signal LED, 4-10 May 1998 7520-A2-GB20-20...
  • Page 75 Alarm LED on, 6-3 ATI, 6-3 detecting, 4-1 Device Fail, 6-3 error message, 6-1 no data, 6-3, 6-4 7520-A2-GB20-20 rear panel, connections, 1-4 reset device, 6-4 revision numbers, 6-4 RJ48S network interface cable, C-6 RLSD, Control option, A-6 Carrier Control option, A-6...
  • Page 76 TXD, transmitted data LED, 4-11 user interface, 1-3 access, 2-1 async terminal, 2-1 IN-4 V.35, selecting DTE port, A-5 V.35 connector, C-4 V.54 Initiated DSU Loopback, Network Interface option, V.54 sequences, 5-5 weight of unit, D-1 worksheets, option configuration, B-1 May 1998 7520-A2-GB20-20...

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