3 Tone Slope FINAL TEST using manual meter mode process 5 Point Test and COT Assistance

Transcription

1 3 Tone Slope FINAL TEST using manual meter mode process 5 Point Test and COT Assistance These test results will not be captured in the EXP manager, but are the minimum requirements to close a ticket or order when a 3 Tone Slope test is required. Use this job aid if you have a meter other than Insight EXP. Instructions for the HST 3000 begin on page 2. Use your test set to capture and report the following measurements: Before Dial-in DC Voltage ( T/G, R/G, T/R ) Ringback After Dial-in DC Voltage ( T/R ) Resistance (T/G, R/G, T/R ) Noise (db) Longitudinal balance (db) Actual Loss 1004 Hz (db) Create Central Office Technician ticket request Use set tone request for 404 Hz and 2804Hz Take LOSS readings using test set Capture and document results Table of Tests, Metrics and Repairs No. Test Why Passing Impact Repair Metric 1 a AC Voltage Before Dial-In Checks for hazardous voltage <50 VAC Safety hazard Refer to ICEP engineer 2 a DC Voltage Before Dial-In Determines on/off-hook state, validates dial tone bearing line, checks for hazardous voltage 3 Loop Current Measures loop current and amount of DC power the circuit can deliver to the SNI 4 Noise Measures how much noise a customer would hear. Caused by circuit imbalances, resistive faults, crosses with foreign battery, high resistive opens, defective CO OEs and elevated power influence. 5 Power Influence 6 Longitudinal Balance Harmonic voltages induced into the cable. The difference between the impedance to ground of the Tip and the impedance to ground of the Ring. >21 VDC and <100 VDC 20 ma Customer may be off hook. Safety hazard >100 VDC CPE doesn t dial properly, low speech signal, no/slow dial tone, ringing after answer <26 dbrnc Hum or static, slow dialup data speeds, fax transmission problems <96 dbrnc May generate metallic noise >50 db May cause hum on line, xdsl circuits will not be reliable Refer to ICEP engineer if hazardous voltage Add Reg unit to circuit or find other cable count that uses larger gauge wire Fix DC V, Leakage and Opens faults first, as cause for low LB readings. If tests within limits, suspect OE problem. If tests within limits but PI is 96 db or more, refer to Cable Repair. Open cable shields or commercial power distribution problems. Fix only if circuit noise is >20 db. Fix one sided grounds, crosses or one sided bridged tap on either Tip or Ring

2 7 Loss 1004Hz Tests ability for customer to hear and be heard. Checks for DTMF dialing issues. > db Low volume during calls, may reach wrong numbers, low dial-up data speeds Pairs exceeding 18Kft should be loaded. If line is under 18Kft locate and remove bridged tap. 7a 7b 404Hz 2804Hz 3 Tone Slope 3 Tone Slope > - 1.5dB > - 8.5dB 404 Hz and 2804Hz are part of the 3 tone slope and are required for LXFU circuits. COT intervention is required when manually testing. Copper Loop Testing Using the HST 3000 You can use the HST to test resistance, capacitance, grounds, shorts and opens in the copper loop. Copper Measurements testing features includes the following capabilities: Measures AC and DC Voltage Measures Resistance (ohms) Measures Opens (footage) Measures Loop Current (DC ma) Measures Longitudinal Balance (db) Measures Power Influence (dbrnc) Measures Noise (dbrnc) Calculates Balance Measures Circuit Loss (dbm) The copper SIM also has these basic capabilities to: Detects Load Coils (up to 5), Receive and Send Tones or Frequencies, POTS Dialer Caller ID testing (Name & Number) Accessing Copper Measurements Testing After Power-Up, if the HST-3000 does not automatically display the Copper Measurements menu, do the following: 1. Press the Home navigation key. 2. Press the Copper soft key and the Copper Measurements menu will then appear as shown below. What is the DVOM? The Digital Volt / Ohm Meter (DVOM) feature of the HST-3000 is a multiple measuring device. It can measure the following items: AC and DC Voltage Resistance Distance to a Short DC Loop Current To access the DVOM feature: Begin by accessing the Copper Measurements menu. To directly select the DVOM, press the #1 key on the Keypad. (As an alternative, press the Up arrow key to highlight DVOM and then press the OK key.) Important: Correct DVOM measurements require that you have connected the Black clip to Tip, the Red clip to Ring and the Green clip to Ground of the pair under test.

3 Voltage Complete Snapshot To make a complete AC and DC Voltage Snapshot measurement: 1. From the Copper Measurements menu, select DVOM by pressing the #1 key on the Keypad. (As an alternative, press the Up arrow key to highlight DVOM and then press the OK key.) 2. Normally, the unit will then default to the Voltage Snapshot menu on each initial Power Up. It will automatically make a complete One-time measurement of the AC and DC Voltage values currently present. 3. If desired, press the Refresh soft key to update the AC and DC values with a new Voltage Snapshot measurement. 4. If desired, press the Continuous soft key to make continuous complete measurements of the AC and DC Voltages currently present. (Recommended) 5. Pressing the Action soft key (not shown in the picture) allows changing the Voltmeter s internal impedance (choose either 1 M-ohm or 100 K-ohm). 6. Pressing the Display soft key allows you to change to other test functions. Measuring AC Voltage If you would like to use the DVOM to measure just AC Voltage : 1. From the Voltage Snapshot screen press the Display soft key. 2. Press the #2 key on the Keypad and you re there. (As an alternative, press the Up or Down arrow key until 2 - AC Volts is highlighted and then press the OK key.) 3. To specify the measurement connection (T-R, T-G, or R-G), press the Left or Right arrow key until the desired measurement is highlighted on-screen. (As an alternative, press the Actions or Pair soft key and choose the measurement connection desired with the Up or Down arrow key and then press the OK key.) If you would like to use the DVOM to measure just AC Voltage : 4. If desired, you can Save the results by pressing the Results soft key and then press the #2 key on the Keypad. 5. You can press the Up or Down arrow key to quickly move between the AC Volts, DC Volts or Resistance measurement fields. 6. Exit the DVOM by pressing the Cancel key. Measuring DC Voltage If you would like to use the DVOM to measure just DC Voltage : 1. From the Voltage Snapshot screen press the Display soft key. 2. Press the #3 key on the Keypad and you re there. (As an alternative; press the Up arrow key until 3 - DC Volts is highlighted and then press the OK key.) 3. To specify the measurement connection (T-R, T-G, or R-G), press the Left or Right arrow key until the desired measurement is highlighted on-screen. (As an alternative, press the Actions or Pair soft key and choose the measurement connection desired with the Up or Down arrow key and then press the OK key.) If you would like to use the DVOM to measure just DC Voltage : 4. If desired, you can Save the results by pressing the Results soft key and then press the #2 key on the Keypad. 5. You can also press the Up or Down arrow key to quickly move between the AC Volts, DC Volts or Resistance measurements. 6. Exit the DVOM by pressing the Cancel key. Measuring Resistance (Ohms) Using the DVOM, you can measure Resistance to identify Shorts, Grounds, and Resistive Continuity. To measure Resistance : 1. From the Voltage Snapshot screen press the Display soft key. 2. For a Resistance Snapshot test, press the #4 key. 3. Or, for a Resistance Continuous test; press the #5 key. (Recommended) 4. As an alternative, select either 4 - Resistance Snapshot or 5 - Resistance Continuous by highlighting with the Up or Down arrow keys and then press the OK key.

4 Using the DVOM, you can measure Resistance to identify Shorts, Grounds, and Resistive Continuity. 5. To specify the Resistance Continuous measurement connection (T-R, T-G, or R-G), press the Left or Right arrow key to highlight the desired measurement on-screen. (As an alternative, press the Actions or Pair soft key and choose the measurement connection desired with the Up or Down arrow key and then press the OK key.) 6. If desired, Save the data by pressing the Results key and then press the #2 key on the Keypad. 7. Exit the DVOM by pressing the Cancel key. Important: Press the Leakage soft key to use the high-voltage (120v) ohmmeter to break-down any suspected Galvanic Action. Measuring Distance to a Short The following procedure describes how to have the HST-3000 calculate the Distance to a measured Short. 1. Measure the value of the Short with the DVOM s Resistance Snapshot or the DVOM s Resistance Continuous tool as previously described. 2. Press the Display soft key. 3. To directly select Distance to Short press the #6 key on the Keypad. (As an alternative, arrow key Down to highlight 6 - Distance to Short and press the OK key.) 4. The meter will automatically give you the Distance to the measured Short based on the current Gauge and Temperature settings. The following procedure describes how to have the HST-3000 calculate the Distance to a measured Short. 5. Adjust the Gauge setting by pressing the Left or Right arrow keys. 6. Adjust the Temperature setting by pressing the Up or Down arrow key or input a specific value with the Keypad. 7. If desired, press the Leakage soft key, to use the high-voltage (120v) ohmmeter to break-down Galvanic Action. 8. To Save, press the Results key. Important: The Distance Measurement function is only accurate to a solid Short. Generally, a Ohm measurement is likely to be solid unless manually added from the far end. Measuring Current Using the DVOM, you can check for proper DC Loop Current on POTS lines. To measure DC Loop Current : 1. Launch the DVOM as previously described. 2. Press the Display soft key from any of the measurement fields. 3. Press the #5 key on the Keypad to move directly to the DC Loop Current test function. (As an alternative, press the Up or Down arrow keys to select 5 - DC Current and then press the OK key.) 4. The DC Current menu will automatically appear with the latest T-R measurement results. Measuring Current continued steps Using the DVOM, you can check for proper DC Loop Current on POTS lines. 5. If desired, Save the data by pressing the Results key and then press the #2 key on the Keypad. 6. Exit the DVOM by pressing the Cancel key. Note: CenturyLink standard is Loop Current must be 20 ma or greater at the SNI to be considered acceptable. Measuring Opens The HST-3000 measures the total Capacitive length of a pair using the Opens feature. To measure Opens 1. From the Copper Measurements menu press the #2 key to access the Opens function. (As an alternative, press the Up or Down arrow key to select 2 - Opens and then press the OK key.) 2. Change the highlighted measurement relationship (T-R, T-G, or R-G), by pressing the Left or Right arrow key, or by pressing the Pair soft key and selecting the desired measurement relationship.

5 3. Change the Cable Type by pressing the Up or Down arrow key, or by pressing the Display soft key and selecting the appropriate Cable Type. 4. Press the Results soft key to Save or Clear the data. 5. Exit the "Opens menu by pressing the Cancel key. Note: CenturyLink standard for acceptable Capacitive balance requires greater than 98% equality between the Tip and Ring lengths. Measuring Longitudinal Balance Longitudinal Balance is an overall measurement of the Resistive and Capacitive properties of a cable pair. To perform a Longitudinal Balance test: 1. From the Copper Measurements menu select the Balance / Noise / PI measurement tool by pressing the #3 key on the Keypad. (As an alternative, press the Up or Down arrow keys to select 3 Balance / Noise / PI and then press the OK key.) 2. The unit will then display the Longitudinal Balance test screen. 3. Press the Start soft key to begin the test. 4. The measured Longitudinal Balance value will display and the unit will constantly refresh the test until the Stop soft key is pressed. 5. Press the Results soft key to "Save the data. Note: The CenturyLink standard for acceptable Longitudinal Balance is greater than or equal to 60 db. Measuring Power Influence & Noise Power Influence is the unwanted currents that are magnetically induced on the cable pair from AC power lines and other AC sources. Noise is the measurement of the unwanted sound that a customer is likely to hear due to poor cancellation of the induced Power Influence currents. To perform Power Influence and Noise test: 1. From the Copper Measurements menu press Display and select the Balance / Noise / PI measurement tool by pressing the #3 key on the Keypad. (As an alternative, press the Up or Down arrow keys to highlight 3 Balance / Noise / PI and then press the OK key.) 2. The unit will then display the Longitudinal Balance test screen as previously discussed. 3. Next, press the Display soft key and then press the #3 key on the Keypad to select the PI/Noise test function. (As an alternative, press the Display soft key and use the Down arrow key to select 3 - PI/Noise and then press the OK key.) 4. The Noise / Power Influence test screen will then display. 5. Press the Display soft key and then press the #1 key on the Keypad to select the POTS Dialer function. 6. Enter the quiet termination number for your wire center. 7. Press OK to dial then Cancel to close Dialer. (There is a built in DC hold circuit to keep the line from dropping. On milliwatt/quiet lines you will not hear the 1004 Hz tone once you press cancel ). 8. Press Start to begin the test. 9. The measured Power Influence and Noise values will display and the unit will constantly refresh the test until the Stop soft key is pressed. 10. Launch the POTS Dialer to go On Hook when finished. Calculating Balance Balance is a calculated indication of the quality of the telephone cable pair and the degree to which the Tip and Ring conductors are electrically the same in their ability to cancel Noise. Balance is traditionally calculated by subtracting a measured Noise value from a measured Power Influence value. It is only a calculation and is not necessarily accurate. Copper test meters can actually measure a cable pair s overall balance with a Longitudinal Balance test.

6 A Longitudinal Balance measurement is always preferred over a calculated Balance value. Calculating Balance You can have the HST-3000 calculate Balance by doing the following: 1. Perform a Power Influence and Noise measurement as shown previously. 2. On the results screen, the HST-3000 will automatically calculate the Balance value if the Power Influence measurement is at least 40 dbrnc. 3. Press the Results soft key to Save or Clear the data. Note: CenturyLink standard for acceptable Power Influence is less than or equal to 80 dbrnc. Acceptable Noise is 0 to 20 dbrnc. The resulting Balance (PI Noise = Balance) should calculate to a value greater than or equal to 60 db. Measuring loop loss The HST-3000 can send and receive voiceband tones to measure loop loss, to perform a 3-tone slope test, and dial the telephone switch to receive a milliwatt tone. To access the Loss Measurement function 1. Access the Copper Measurements menu 2. Press the 6 key. The Loss Meter menu appears. 3. Press the Display soft key. 4. Press the 4 key to select the service status: out-of-service line (disconnected from the switch, no battery) or inservice (connected to switch with CO/exchange battery). 5. Press the Actions soft key. 6. Press the 5 key to select either 600 or 900 Ohm termination for the loop. 7. View the loss results. Receiving tones The following procedure describes how to receive tones. 1. Connect the tip, ring, and ground leads to the line under test. 2. Press the Actions soft key, then the 1 key. 3. Press the Start soft key. 4. Press the STOP soft key. Transmitting tones The following procedure describes how to transmit tones. 1. Connect the tip, ring, and ground leads to the line under test. 2. Press the Actions soft key, and select one of the following options: To transmit custom tones, press 3. A popup menu appears. Using the keypad, enter a frequency. To transmit other tones, press 2, and then select one of the transmission options: To transmit a 404 khz tone, select Transmit 404 To transmit a 1004 khz tone, select Transmit 1004 To transmit a 2804 khz tone, select Transmit Press the Start soft key. The tone graph appears. 4. Optional. To change the amplitude of the signal, press the Actions soft key, and then press Optional. To change the frequency, press the left and right arrows. 6. Press the Stop soft key. Transmitting tones is complete.