HP OMNIBER 718 37718A Operation & User’s Manual
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HP OMNIBER 718 37718A, 29 Selecting Test Features Using Receive Overhead Capture Using Receive Overhead Capture Description Section, Line and Path overhead provide network support functions, responding dynamically to network conditions and needs. It is therefore useful to capture overhead activity on a frame by frame basis. TIP: The Overhead Capture display can be logged to the chosen logging device. See "Logging on Demand " page 110. HOW TO: 1 Set up the receive SONET interface and payload as required. See “Setting SONET Receive Interface” page 17. 2 Choose the overhead type as required. SOH- Section Overhead LOH- Line Overhead POH- Path Overhead 3 Choose the Byte or bytes of overhead to be cap
30 Selecting Test Features Using Receive Overhead Capture - captures activity after the first occurrence of a deviation from your specified overhead state. Can be used for transient detection from a specified expected state. 4 Up to 16 records of overhead state are provided. Each record will represent between 1 and 64,000 frames. A capture is started by pressing CAPTURE and
Index 173 A Alarm scan DSn, 83 SONET, 82 Alarms & errors DSn add, 50 DSn payload add, 50 SONET add, 49 Analysis measurement DSn, 71 DSn payload, 71 SONET, 70 APS messages generation, 64 monitoring, 25 test function, 64 Automatic protection switch message generation, 64 Autotolerance, 89 B B/G mapping selection SONET, 5 Background mapping selection SONET, 5 Background Patterns, 168 Beep on
HP OMNIBER 718 37718A, Contents v 1 Setting the Interfaces Setting DSn Transmit Interface 2 Setting SONET Transmit Interface 4 Setting Jitter Transmit Interface 7 Setting Wander Transmit Interface 9 Setting SONET THRU Mode 11 Using Smart Test 13 Setting DSn Receive Interface 15 Setting SONET Receive Interface 17 Setting Jitter Receive Interface 18 Setting Extended Jitter Receive Interface 19 Setting Wander Receive Interface 20 2 Selecting Test Features Using Transmit Overhead Setup 22 Using Receive Overhead Monitor 24 Setting Overhead Trace Messages 26 Generating Overhead Sequences 27 Using Receive Overhead Capture 29 Adding Frequency Offset to SONET Signal 31 Adding Frequency Offset to
HP OMNIBER 718 37718A, 38 Selecting Test Features Setting Transmit Structured Payload/Test Signal 5 Choose the B/G PATTERN. The B/G PATTERN in the non test 56/64 kb/s timeslots is fixed as NUMBERED,thatis,eachtimeslotcontains aunique numbertoallow identification in case of routing problems. Signaling 6 If a 2 Mb/s PAYLOAD with PCM30 or PCM30CRC framing, or 56 kb/s or Nx56kb/s Test Signal is chosen. See, "Setting up Signaling Bits " page 34.
62 Selecting Test Features Using Pointer Graph Test Function If, during a long term measurement (4 days), an event occurs at a particular time each day, a short term measurement can be made at the identified time to gain more detail of the event. 3 Choose the POINTER UNDER TEST type. 4 Press to start the measurement. TIP: If the event occurs outside normal working hours, a T
HP OMNIBER 718 37718A, 158 Selecting and Using "Other" Features Suspending Test on Signal Loss Suspending Test on Signal Loss When running a test, you can choose to suspend the test during periods of signal loss. This function is available on the display. HOW TO: 1 Choose SUSPEND TEST ON SIGNAL LOSS . OTHER MISCELLANEOUS ON
HP OMNIBER 718 37718A, 101 Storing, Logging and Printing Viewing the Bar Graph Display Viewing the Bar Graph Display Description All the graphic results obtained during the measurement are available for viewing. Identify a period of interest and zoom in for more detailed examination. HOW TO: 1 To view the current bar graphs, press and use and to obtain the bar graphs required. 2 To view previously stored graphs, see "Recalling Stored Graph Results " page 99. 3 For more detailed inspection of the bar graph, position the cursor centrally within the area of interest using , an
HP OMNIBER 718 37718A, 68 Making Measurements Using Overhead BER Test Function Using Overhead BER Test Function Description You can perform a Bit Error Rate test on chosen bytes of the section, line and path overhead bytes. You can access the transmit Overhead BER on the display. HOW TO: 1 Set up the SONET transmit interface and payload required. See "Setting SONET Transmit Interface " page 4. 2 Set up the receive SONET interface and payload as required. See "Setting SONET Receive Interface " page 17. 3 Choose the overhead byte to be tested on the display. 4 Choose the overhead byte to be tested on the display. 5 Press to start the test. 6 The PRBS pattern can be errored by pressing . TRANS
HP OMNIBER 718 37718A, 72 Making Measurements Measuring Frequency Measuring Frequency Description The signal frequency and the amount of offset from the standard rate can be measured to give an indication of probability of errors. HOW TO: 1 Connect the signal to be measured to the IN port of the DSN Receive module or the IN port of the Multirate Analyzer module (SONET electrical) or the IN port of the Optical Interface module (SONET optical). NOTE Frequency measurement is always available even if test timing is off.
HP OMNIBER 718 37718A, 61 Selecting Test Features Using Pointer Graph Test Function Using Pointer Graph Test Function Pointer Graph shows the relative offset during the measurement period. This allows the time relationship of SPE or VT pointer movements to be observed. Up to 4 days of storage allows long term effects such as Wander to be observed. If an alarm occurs during the measurement period, a new graph starts at the centre of the display (offset zero) after recovery from the alarm. TIP: The Pointer Graph display can be logged to the chosen logging device. See "Logging on D
HP OMNIBER 718 37718A, 117 Storing, Logging and Printing Logging Results to HP-IB Printer Logging Results to HP-IB Printer Description If Option 601, Remote Control Interface, is fitted, you can log the results and alarms to an external HP-IB printer connected to the HP-IB port. HOW TO: 1 Connect an HP-IB printer to the HPIB port. NOTE Choosing HP-IB external printer for logging prevents the use of HP-IB remote control. 2 Choose the LOGGING SETUP and set up the display as required. See "Logging Results " page 107 or "Logging on Demand " page 110. CONTROL
HP OMNIBER 718 37718A, 45 Selecting Test Features Inserting an External DSn Payload/Test Signal Structured SONET Payload 2 Set up the required transmit SONET interface. See "Setting SONET Transmit Interface " page 4. 3 Set up the SONET structured payload. See "Setting Transmit Structured Payload/Test Signal " page 37. 4 Choose 2M PAYLOAD/DS1 PAYLOAD or . 5 Choose the LINE CODE. Structured DSn 6 Set up, the required transmit DSn interface, See "Setting DSn Transmit Interface " page 2. 7
122 Storing, Logging and Printing Changing Internal Printer Paper Changing Internal Printer Paper Description The printer accepts rolls of thermal paper with the following dimensions: Suitable rolls of paper are available from Hewlett Packard, Part Number 9270-1360. WARNING The paper tear-off edge is SHARP. This edge is exposed when the printer cover is raised. Note
HP OMNIBER 718 37718A, 23 Selecting Test Features Using Transmit Overhead Setup If (Transport Overhead) is chosen, choose the STS-1 to be displayed.Many bytesin and areunlabeled as the other overhead functions have not yet been defined. If is chosen, the hexadecimal value of all 81 bytes of the STS-3 section & line overhead selected are displayed (all 324 bytes of an OC-12 or 1,296 bytes of an OC-48 are displayed 81 bytes at a time by selecting each STS-3 in turn). The value of the bytes can be set using . If BYTE NAMES is chosen, the labels for the overhead bytes are displayed. 3 If POH (Path Overhead) is chosen, choose the TYPE of overhead within STS-1 under test to be setup. J1 and J2 byt
HP OMNIBER 718 37718A, 86 Making Measurements Measuring Extended Jitter Measuring Extended Jitter Description: Extended jitter measurements are made in a jitter bandwidth of 0.1 Hz to 25 kHz. These measurements are made at the upper end of the standard wander frequency range and the lower end of the standard jitter frequency range. When is chosen Jitter results are provided. Cumulative and Short Term results of Jitter Amplitude and Jitter Hits are provided on the display. HOW TO: 1 If measuring Extended Jitter on a DSn signal, set up the receive DSn in
HP OMNIBER 718 37718A, 15 Setting the Interfaces Setting DSn Receive Interface Setting DSn Receive Interface Description DSn Receive interface settings should match the network equipment settings of Rate, Termination and Line Code and determine the Payload to be tested. TIP: To set the transmitter and receiver to the same interface settings choose . HOW TO: 1 Choose the required SIGNAL rate. 2 If you have chosen 2 Mb/s as the SIGNAL rate, choose the required TERMINATION. (At all other rates the impedance is fixed.) 3 If you have chosen 2 Mb/s or DS1 as the SIGNAL rate, choose the required LINE CODE. (At 34Mb
HP OMNIBER 718 37718A, 59 Selecting Test Features Adding Pointer Adjustments NOTE For SPE pointers the sequence interval is selectable from 7.5 ms, 10, 20, 30, 34 ms; 40 to 100 ms in 10 ms steps, 100 to 1000 ms in 100 ms steps 1, 2, 5, 10 seconds. For VT pointers the sequence interval is selectable from: 200 ms, 500 ms, 1, 2, 5 and 10 seconds. ForSPEpointerstheminimumspacingbetweenadjustmentsis500us. For VT pointers the minimum spacing between adjustments is 2 ms. GR-253 5-32(c) PERIODIC ADD (26-1 Pattern) This selection is only available if you have selected VT1.5 mapping. The sequence pattern is 26 pointer movements followed by 1 missing pointer movement. The added adjustment occurs 2 ms after th
HP OMNIBER 718 37718A, Contents vii Measuring Jitter Transfer 92 4 Storing, Logging and Printing Saving Graphics Results to Instrument Store 98 Recalling Stored Graph Results 99 Viewing the Bar Graph Display 101 Viewing the Graphics Error and Alarm Summaries 103 Logging Graph Displays 105 Logging Results 107 Logging on Demand 110 Logging Jitter Tolerance Results 112 Logging Jitter Transfer Results 114 Logging Results to Parallel (Centronics) Printer 116 Logging Results to HP-IB Printer 117 Logging Results to Internal Printer 118 Logging Results to RS-232-C Printer 119 Printing Results from Disk 120 Connecting an HP 850C DeskJet Printer to a Parallel Port 121 Changing Internal Print
HP OMNIBER 718 37718A, 27 Selecting Test Features Generating Overhead Sequences Generating Overhead Sequences Description You may insert a pattern into a functional group of overhead bytes for testing or troubleshooting purposes. HOW TO: 1 Set up the SONET transmit interface and payload required. See “Setting SONET Transmit Interface” page 4. 2 Choose the type of sequence required. SINGLE RUN - runs the sequence once and then stops. REPEAT RUN - runs the sequence repeatedly until STOPPED is chosen. 3 Choose the overhead type as required. SOH- Section Overhead LOH- Line Overhead POH - Path Overhead 4 Choose the byte or bytes of overhead required. 5 Set up the required number of data pa
HP OMNIBER 718 37718A, 151 Using Instrument and Disk Storage Copying Graphics Results from Instrument Store to Disk 4 If you wish to view the graphic results at a later date via a spreadsheet, choose FORMAT . CSV is Comma Separated Variable. If you wish to view the graphic results at a later date on an HP 37718A, choose FORMAT . 5 To copy the configuration from instrument to Disk, choose . If you have entered a filename which already exists, a warning "File exists - are you sure you wish to continue" is displayed. If YES is selected, the data on the Disk will be overwritten. If NO is selected, the operation is aborted. Thisallowsyoutheopportunitytoview thedata onthe Diskand verify that it is no
HP OMNIBER 718 37718A, 116 Storing, Logging and Printing Logging Results to Parallel (Centronics) Printer Logging Results to Parallel (Centronics) Printer Description If Option 601, Remote Control Interface, is fitted, you can log the results and alarms to an external Parallel printer connected to the PARALLEL port. The Parallel port provides a standard IEEE 1284-A compatible interface. CAUTION Damagetotheinstrumentmayresult ifa serialconnectionis madeto this port. HOW TO: 1 Connect the Parallel printer to the PARALLEL port. See "Connecting an HP 850C DeskJet Printer to a Parallel Port " page 121. 2 If a non HP printer is connected choose ALT PRINTER. Choose 80 character column width or 40 ch
HP OMNIBER 718 37718A, 107 Storing, Logging and Printing Logging Results Logging Results Description Test Period Logging If degradations in system performance can be observed at an early stage, then the appropriate remedial action can be taken to maximize circuit availability and avoid system crashes. Test period logging allows you to monitor the error performance of your circuit. At the end of the test period the selected results are logged. Results can be logged at regular intervals during the test period by selecting a LOGGING PERIOD of shorter duration than the test period. An instant summary of the results can be demanded by pressing without affecting the test in progress. Error Event Logging Manual t
HP OMNIBER 718 37718A, 35 Selecting Test Features Setting up Signaling Bits SONET Operation 1 Choose on the display 2 Choose MAPPING or and VT PAYLOAD or on the display. 3 If UNSTRUCTURED is chosen set the 2M CAS ABCD bits value on the display. If STRUCTURED is chosen set the 2M CAS ABCD bits value on the display. HOW TO Transmit a DS1 payload signal with user-defined signaling bits DSn Operation 1 Choose on the display. SONET TRANSMIT ASYNC 2Mb/s FL BYTE 2Mb/s PCM30 PCM30CRC MAIN SETTINGS MAIN SETTINGS STRUCTURED SETTINGS PDH/DSn TRANSMIT
HP OMNIBER 718 37718A, 91 Making Measurements Measuring Jitter Tolerance HOW TO: View the Results 1 Choose the results FORMAT. If is chosen, a plot of the jitter tolerance results against the ITU-T mask is displayed. If ischosen,the results from which the graph is constructed are displayed, Point number, Frequency, Mask amplitude, Tolerance, Result. If applicable, results 13 through 55 can be viewed on pages 2 through 5. If you wish to log the jitter tolerance results to a printer, See “Logging Jitter Tolerance Results” page 112. GRAPH TEXT
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