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Digital Lightwave ASA 312 Calibration Manual

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ASA 312
NETWORK
®
INFORMATION COMPUTER
™
CALIBRATION MANUAL
April 2002
Document No. RF 002331D
1 5 55 0 L ig h t wa v e D riv e • C le a rw a te r , F lo rid a 3 3 7 6 0 • U n it e d St a t e s
T: 7 27 . 4 42 . 6 67 7 • F: 7 27 . 4 42 . 5 66 0 • To ll Fre e : 8 0 0 .5 4 8 .9 2 8 3 o r 8 77 . 2 75 . 3 44 5
i nfo @l ig ht w ave.co m • ht t p: // w ww. lig h t wave. com

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  • Page 1 ASA 312 NETWORK ® INFORMATION COMPUTER ™ CALIBRATION MANUAL April 2002 Document No. RF 002331D 1 5 55 0 L ig h t wa v e D riv e • C le a rw a te r , F lo rid a 3 3 7 6 0 • U n it e d St a t e s T: 7 27 .
  • Page 2 English language, contact Digital Lightwave, Inc. Digital Lightwave, Inc. reserves the right to revise and improve its product as it sees fit. This publication describes the state of this product at the time of its publication and may not represent the product at all times in the future.
  • Page 3 Include the RMA number on the outside of the shipping container. If the original shipping container is not available, (a) an ASA 312 shipping container (Part Number ASA-BOX) can be purchased from Digital Lightwave, or (b) pack the unit (and letter that describes the reason for the return) into...
  • Page 4 Use of controls or adjustments or procedures other than those specified herein may result in hazardous radiation exposure. The ASA 312 uses a lithium battery located in the service access area Replacing the Battery not accessible to customers. To avoid damaging the unit, do not under any circumstances attempt to replace the lithium battery.
  • Page 5 The following label is located on the rear of the ASA 312. Serial No. / Model No. Label Draft 1 — DLI Proprietary Information 4/15/02...
  • Page 6 The following label is located on the ASA 312’s Connector Panel. Class 1 Laser Label ASA 312 Lasers Typical Normal Laser Wavelength Class Operation Output Power* 30 µ W OC-1/12 1310 nm Class 1 29 µ W OC-1/12 1550 nm Class 1 25 µ...

  • Page 7: Table Of Contents

    Hardware Setup ........2-4 ASA 312 Settings ........2-4 Oscilloscope Settings .
  • Page 8 Optical Power Calibration for a Single Laser or Dual Laser ASA 312 ....... . 5-1 Initial Optical Power Measurement .
  • Page 9 ASA 312 Network Information Computer Calibration Manual Contents Calibrating Optical Power for OC-48 ..... 5-8 OC-48 Reference Value ......5-8 First OC-48 Optical Power Measurement .
  • Page 10 Contents Document No. RF 002331D Draft 1 — DLI Proprietary Information 4/15/02...
  • Page 11 Use this guide to obtain a basic understanding of the ASA 312’s calibration procedures. This guide is intended for personnel responsible for maintaining and calibrating the ASA 312. It is assumed that you have a basic understanding of the following: ASA 312 Network Information Computer Oscilloscopes...
  • Page 12 Calibration Values section. This typeface is used to emphasize text. For example: If you have a single laser ASA 312, this concludes the Optical Calibration for an ASA 312 with OC-1, OC-3, or OC-12 optical interfaces. This typeface indicates a command name, menu selection, button, or icon. For example: Press the Optical Power Range command and select 1.

  • Page 13: Asa 312 Calibration Overview

    ASA 312’s voltage, power, and frequency measurements. Although the ASA 312 may be calibrated at any time, it is recommend that calibration procedures be performed only during routine scheduled maintenance. (Digital Lightwave recommends a calibration interval of two years.) This avoids any accidental changes to the unit’s default and calibration settings.

  • Page 14: Calibration Overview

    ASA 312 Calibration Overview Document No. RF 002331D Calibration Overview The ASA 312 uses a soft calibration method to maintain the accuracy of several measurement factors. To perform calibration of the unit, you will attach several different scopes, generators, meters, and cables to the ASA 312 to measure, and if necessary adjust, electrical and optical measurement parameters of the ASA 312.

  • Page 15: Measurements

    An optical power meter (Digital Lightwave uses a Laser Precision LP-5000 or equivalent device.) A fiber optics cleaning kit Measurements The ASA 312 uses a soft-calibration method to adjust parameters for the following measurements: Frequency calibration DS1 calibration DS3 calibration...

  • Page 16: Calibration Commands

    ASA 312 Calibration Overview Document No. RF 002331D Calibration Commands The ASA 312 is unique in that you can calibrate the unit in the field or on-site. The calibration commands are accessible from any of the four protocol processors. To display calibration commands on the ASA 312 Touch Screen user interface: –...

  • Page 17: Ds3 Pos Peak

    Saves any calibration value changes. You must enter a calibration password for the ASA 312 to accept the new values. Use the Touch Screen keypad to enter the password. Refer to Chapter 6 for information about saving new calibration values.
  • Page 18 ASA 312 Calibration Overview Document No. RF 002331D Draft 1 — DLI Proprietary Information 4/15/02...

  • Page 19: Ds1 And Frequency Adjustment Calibration

    (refer to Figure 2-1). To attach cables between the ASA 312 and the frequency counter: 1. Make sure that both the ASA 312 and frequency counter are turned on. 2. Attach the cable’s BNC connector to the BNC connector on the frequency counter.

  • Page 20: Asa 312 Settings

    Figure 2-1. ASA 312 (Bantam) to Frequency Generator (BNC) Connection ASA 312 Settings To set up the ASA 312 for Frequency Adjustment: 1. Using the ASA 312 Touch Screen, select the DS1 Protocol Processor. 2. Press the Trnsmt Function Group button. 3. Press the Settings button.

  • Page 21: Ds1 Positive And Negative Peak Settings

    For example, if the Frequency Adj command is 128, enter a value between 129 and 255. You may need to wait several seconds before the ASA 312 accepts the change, and the new frequency value appears on the frequency counter display.

  • Page 22: Hardware Setup

    DS1 calibration (refer to Figure 2-2). To attach cables between the ASA 312, the oscilloscope, and function generator: 1. Make sure that the ASA 312, the oscilloscope, and function generator are turned on. 2. Attach the BNC T-connector to the output of the function generator.

  • Page 23: Function Generator Settings

    ASA 312 Network Information Computer Calibration Manual DS1 and Frequency Adjustment Calibration Function Generator Configure the function generator to the following settings. Refer to the function Settings generator’s user documentation for specific operation. Sine wave output 0V DC offset 3Vp (6 Vp-p) amplitude 772 KHz ±...
  • Page 24 DS1 and Frequency Adjustment Calibration Document No. RF 002331D 5. Press the DS1 Range command and select 1. NOTE For subsequent DS1 Range settings, select the appropriate Range value (2, 4, 8, 16, 32, or 64). 6. Press the DS1 Pos Peak command and use the Touch Screen keypad to enter the measured DS1 positive peak adjustment value.

  • Page 25: Ds3 Calibration

    2. Attach the BNC T-connector to the oscilloscope’s BNC input connector. 3. Attach one end of a 75 ohm BNC coaxial cable to the BNC T-connector and the other end of the BNC cable to the ASA 312’s DS3 TX BNC connector. (Refer to Figure 3-1.) 4.

  • Page 26: Asa 312 Settings

    ASA 312 Settings To setup the ASA 312 for DS3 Terminated calibration: 1. From the ASA 312 Touch Screen, select the DS3 Protocol Processor. 2. Press the Receive Function Group button. 3. Press the Line Interface Input Termination command and select Terminated.

  • Page 27: Calibrating Ds3 Terminated

    ASA 312 Network Information Computer Calibration Manual DS3 Calibration Calibrating DS3 Terminated Use the following procedures to calibrate DS3 Terminated settings: 1. Using the oscilloscope, measure and record the positive and negative peak values. 2. From the ASA 312 Touch Screen: –...

  • Page 28: Hardware Setup

    4. Connect a BNC cable from the 75-ohm attenuator’s output connector to the BNC T-connector on the oscilloscope’s BNC input connector. 5. Connect a BNC cable from the ASA 312’s DS3 RX connector to the BNC T- connector on the oscilloscope.

  • Page 29: 90 Mv Peak Adjustment

    90 mV Peak Adjustment To adjust the DS3 signal to 90 mV peak 1. Adjust the attenuator so that the ASA 312’s output is approximately equal to 90 mV peak on the oscilloscope. 2. Using the oscilloscope, measure and record the positive and negative peak values.

  • Page 30: Ds3 High Settings

    Review these procedures before attempting to calibrate DS3 High parameters. Required Equipment The following equipment is required to perform DS3 High calibration: ASA 312 or DS3 test equipment with a signal output capacity up to 1.2 volts peak Digital oscilloscope BNC T-connector Two 2-ft., 75-ohm coaxial cables with male BNC connectors...

  • Page 31: Asa 312 Settings

    ASA 312 Settings To set up the ASA 312 for DS3 High calibration: 1. From the ASA 312 Touch Screen, select the DS3 Protocol Processor. 2. Press the Receive Function Group button. 3. Press the Line Interface Input Termination command and select High.

  • Page 32: Calibrating Ds3 High

    DS3 negative peak adjustment value. 6. Press Enter to accept the new value. If these values are not accepted by the ASA 312, use testing equipment with an output signal up to 1.2 volts peak. Calibrate using a value range between 0.96 to 1.2 volts peak until the ASA 312 accepts a value.

  • Page 33: Stsx-1 Calibration

    1. Make sure that the ASA 312 and oscilloscope are turned on. 2. Connect the BNC T-connector to the oscilloscope’s BNC input connector. 3. Connect one end of a BNC cable to the ASA 312’s STSX-1 TX BNC connector and connect the other end of the cable to the BNC T-connector attached to the oscilloscope.

  • Page 34: Asa Settings

    Document No. RF 002331D ASA Settings To set up the ASA 312 for STSX-1 calibration: 1. From the ASA 312 Touch Screen, select the SONET Protocol Processor. 2. Press the Trnsmt Function Group button. 3. Press the Settings button. 4. Press the Transmit Interface command and select STSX-1.

  • Page 35: Optical Power Calibration

    Before You Begin Before performing Optical Power calibration, use a fiber optics cleaning kit to clean the fiber optic ports on the ASA 312, the optical power meter, the optical attenuator, and the fiber cables. Dirty optical ports will effect optical measurements.

  • Page 36: Initial Optical Power Measurement

    To obtain the initial optical power measurement for an ASA 312: Measurement 1. Make sure that the ASA 312 and the optical power meter are turned on. Make sure that the optical power meter is set for the proper wavelength (1310 nm or 1550 nm).
  • Page 37 8. Remove the dustcap that covers the OC-1/3/12 RX optical port on the ASA 312. Connect the other end of the fiber optic cable to the OC-1/3/12 RX port so that the fiber optic cable is looped from the ASA 312’s TX optical port to the RX optical port. Optical Power Meter ASA 312 Proceed to the next section to enter the optical power for Range 1.

  • Page 38: Setting Range 1

    WARNING The ASA 312’s optical Transmit output is produced by a Class 1 laser device. You should never, under any circumstances, look into an unterminated fiber. Always turn the Laser off when a fiber is unterminated. After connecting the fiber, turn the Laser on.

  • Page 39: Setting Range 2

    WARNING The ASA 312’s optical Transmit output is produced by a Class 1 laser device. You should never, under any circumstances, look into an unterminated fiber. Always turn the Laser off when a fiber is unterminated. After connecting the fiber, turn the Laser on.

  • Page 40: Setting Range 3

    WARNING The ASA 312’s optical Transmit output is produced by a Class 1 laser device. You should never, under any circumstances, look into an unterminated fiber. Always turn the Laser off when a fiber is unterminated. After connecting the fiber, turn the Laser on.

  • Page 41: Setting Range 4

    WARNING The ASA 312’s optical Transmit output is produced by a Class 1 laser device. You should never, under any circumstances, look into an unterminated fiber. Always turn the Laser off when a fiber is unterminated. After connecting the fiber, turn the Laser on.

  • Page 42: Calibrating Optical Power For Oc-48

    To enter the first OC-48 optical power measurement: Power Measurement 1. Attach a fiber optic cable from the ASA 312’s TX OC-48 optical port to the optical attenuator’s input connector. 2. Attach a fiber optic cable from the attenuator to the optical power meter.

  • Page 43: Second Oc-48 Optical Power Measurement

    WARNING The ASA 312’s optical Transmit output is produced by a Class 1 laser device. You should never, under any circumstances, look into an unterminated fiber. Always turn the Laser off when a fiber is unterminated. After connecting the fiber, turn the Laser on.
  • Page 44 Optical Power Calibration Document No. RF002331D 5-10...

  • Page 45: Saving Calibration Values And Passwords

    Saving New Calibration Values After entering new calibration values, you must save this data so that the values are retained when the ASA 312 is turned off. A system password must be used to save the values. The following describes how to save calibration values: 1.
  • Page 46 Saving Calibration Values and Passwords Document No. RF 002331D 4. Enter the current system password and then press Enter. If the current password is correct, a prompt for the new system password appears. Press OK. If the password is incorrect, the message Invalid Password appears and the password function is aborted.

  • Page 47: A Asa 312 Connector Panel

    ASA 312 Connector Panel The ASA 312 connector panel contains a wide variety of auxiliary interfaces. The interfaces are illustrated in the following figures. GPIB: Interface used to Jitter Out: BNC connector STSX-1 RX TX: BNC connect a GPIB cable for...
  • Page 48 * If the unit is configured for Jitter operation, the OC-48 RX and OC-48 TX connectors are not installed. Instead, the Jitter Out connector will appear in place of the OC-48 RX connector. Figure A-2. ASA 312 Connector Panel with E1 Configuration...

  • Page 49: Index

    Index , 1-1 , 2-1–2-3 ASA 312 connector panel frequency adjustment , 1-5 , 1-iv canceling calibration changes Ground commands , 1-5, 6-1 Change Password , 1-4 DS1 Neg Peak , 1-4 DS1 Pos Peak , 1-4 laser DS1 Range , 5-1–5-3...
  • Page 50 Index Document No. RF OO2331D , 6-1 saving calibration values , 4-2 STSX-1 calibration Index-2 Draft 1 — DLI Proprietary Information 4/15/02...

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