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Revision 01

December 22, 1997

150-319-142-01

32

PairGain Engineering - Plant Series

 HLU-319 List 4B

Loopback Test Procedures

The loopback configurations are shown in 

Figure 4

.

Figure 4.

HLU-319 List 4B Loopback Configurations

These following loopback procedures verify the integrity of the HDSL 
channels at every module location as well as the DS1 channels to the 
customer and the local DSX-1 interface.

If trouble is encountered on the HLU-319 List 4B DSX-1 interface, verify that 
the HLU-319 List 4B is making a positive connection with its mounting 
assembly (shelf) connector. Also, verify that the HLU-319 List 4B internal 
equalizer is set to the correct distance range. All equalizers should be set to 
the distance from the DSX-1 to the shelf.

The transmit and receive T1 DSX-1 ports have splitting access and bridging 
miniature 210 series jacks. Connecting one cable between the two bridging 

Содержание 150-1140-42

Страница 1: ...RGAIN TECHNOLOGIES INC ENGINEERING SERVICES TECHNICAL PRACTICE SECTION 150 319 142 01 Revision History of This Practice Revision 01 December 22 1997 A Initial Release Model List Number Part Number HLU...

Страница 2: ...n Technologies Inc Information contained in this document is company private to PairGain Technologies Inc and shall not be modified used copied reproduced or disclosed in whole or in part without the...

Страница 3: ...airGain Engineering Plant Series iii USING THIS MANUAL Two types of messages identified by icons appear in the text Notes contain information about special circumstances Cautions indicate the possibil...

Страница 4: ...Revision 01 December 22 1997 150 319 142 01 iv PairGain Engineering Plant Series HLU 319 List 4B...

Страница 5: ...___________________________________ 4 Operational Capabilities 4 Alarms 6 Front Panel Features 8 Installation ____________________________________________ 10 Unpack and Inspect the Shipment 10 Install...

Страница 6: ...29 Addressable Repeater Loopback Functions 29 Initiating Manual Loopback Sessions 30 Loopback Test Procedures 32 GNLB Loopback Test Procedures 33 A1LB A2LB and A5LB Test Procedures 34 A3LB and A4LB T...

Страница 7: ...E1 4 T1 403 1989 and T1E1 4 92 002R2 technical standards and recommendations The HLU 319 List 4B mounts in a single slot of an industry standard 3192 type Mechanics shelf The system complies with Tran...

Страница 8: ...5 dB of loss at 196 kHz with 135 ohm driving and terminating impedances Table 1 provides a guide for the loss over various cable gauges at 196 kHz and 135 ohms The table applies to the HDSL cable pair...

Страница 9: ...6 kHz 135 ohms Line Clock Rate Internal Stratum 4 clock HDSL Start up Time 30 seconds typical 60 seconds maximum per span One way DS1 Delay 220 microseconds per span DSX 1 Line Impedance 100 ohms DSX...

Страница 10: ...e SF including D4 or Extended Super Frame ESF framing The HLU 319 List 4B arbitrarily defines a frame bit for unframed data The HLU 319 List 4B contains a multiplexer that generates two parallel 784 k...

Страница 11: ...due to excessive impairments on the HDSL pairs or excessive impulse or crosstalk noise The demultiplexer removes data link messages from the HDSL loops and passes them to the microprocessor This mech...

Страница 12: ...1ES is displayed on the front panel 6 ALRM H2ES HDSL loop 2 has exceeded the 24 hour user selected Errored Seconds CRC threshold If both H1ES and H2ES occur only H1ES is displayed on the front panel 7...

Страница 13: ...her alarm occurs Disabling the alarm also retires an ACO condition Setting the alarm option to disable prevents the activation of the minor alarm output alarm bus on pin H during a minor alarm event T...

Страница 14: ...319 142 01 8 PairGain Engineering Plant Series HLU 319 List 4B Front Panel Features Figure 1 shows the front panel of the HLU 319 List 4B Table 2 describes the front panel components Figure 1 HLU 319...

Страница 15: ...mal operation HDSL acquisition Fuse alarm Minor alarm Self test in process or an HLU loopback test is in effect HLU 319 List 4B in armed state for loopbacks Receive RCV and transmit XMT jacks Provide...

Страница 16: ...to the transportation company and to your sales representative 2 Verify the contents using the packing list to ensure complete and accurate shipment If you must store the equipment for a prolonged per...

Страница 17: ...s correctly mounted and wired refer to the shelf s technical practice if necessary 2 Slide the HLU 319 List 4B into the card guides for the desired slot then push the unit back until it touches the ba...

Страница 18: ...rformance monitoring functions using the HLU 319 List 4B menus and screens Connect a Dumb Terminal Connect a dumb terminal 1 Connect a standard 9 pin serial terminal cable to the Craft RS 232 port DB...

Страница 19: ...to log on and access the menus and screens using the dumb terminal 1 Press the spacebar several times to active the autobaud feature and to display the log on screen The Main Menu displays 2 Access op...

Страница 20: ...HLU ver1 3 004B HRU ver4 2 008B TIME 00 01 31 DATE 04 09 98 CIRCUIT ID ALARMS NONE LOOPBACK OFF HLU HRU HDSL 1 HDSL 2 HDSL 1 HDSL 2 cur min max cur min max cur min max cur min max MARGIN 22 19 23 23 2...

Страница 21: ...menu 2 Enter the time in 24 hour format hours and minutes only at the New Time prompt 3 Press 4 Enter the date mm dd yy at the New Date prompt 5 Press 6 Type the at the Update Remote prompt to update...

Страница 22: ...Table 3 on page 24 for more information about the options 4 When all selections are made type to exit the option 5 Type to confirm the changes SYSTEM SETTINGS TIME 12 00 13 DATE 04 14 98 CIRCUIT ID E...

Страница 23: ...t 1 From the Main Menu type to display the Loopback Menu 2 Type the number of the desired loopback option 3 Type to exit the Loopback Menu LOOPBACK MENU TIME 12 00 18 DATE 04 14 98 CIRCUIT ID A DISABL...

Страница 24: ...000 000 000 000 000 000 000 000 000 000 09 00 000 000 000 000 000 000 000 000 000 000 000 000 09 15 000 000 000 000 000 000 000 000 000 000 000 000 09 30 000 000 000 000 000 000 000 000 000 000 000 00...

Страница 25: ...00 00000 00000 00000 00000 00000 04 08 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 04 09 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 04 10 00000...

Страница 26: ...it ID Number From the Main Menu type to enter a circuit identification number ALARM HISTORY TIME 12 00 37 DATE 04 14 98 CIRCUIT ID Type First Last Current Count LOS DS1 HLU OK 000 LOS DS1 HRU OK 000 L...

Страница 27: ...an three seconds and release The message on the front panel display alternates between the first system parameter and its current setting 2 Press the SEL button repeatedly to scroll through all possib...

Страница 28: ...ystem Settings menu When the framing parameter is not set to AUTO the HLU 319 LIST 4B mimics one of the other line code settings AMI or B8ZS This is not determined by the received line code The DS1 li...

Страница 29: ...ch entry After all the settings are made press to to exit the blocking option then to confirm The new choices are now installed All blocked channels are temporarily unblocked when a loopback test is r...

Страница 30: ...pairs Short loops below about 16 dB of loss at 200 kHz can remain in sync with one conductor open Since the loop is still in sync no LOSW condition occurs However the margin on a one conductor loop d...

Страница 31: ...o respond to the Teltrend Mod 1 addressable repeater in band loopback codes P DIS Disables powering to the HRU 412 List 8B and doubler ENA Enables powering to the HRU 412 List 8B and doubler Z ON Tell...

Страница 32: ...nables the activation the output alarm has on pin H when a minor alarm occurs D AUTO The HLU 319 List 4B and HRU 412 List 8B independently monitor their incoming T1 bit streams for the Binary Eight Ze...

Страница 33: ...the HiGain system to transmit the AIS signal at both the HLU 319 List 4B and HRU 412 List 8B T1 output ports when both of the HDSL loops are not in sync LOSW 1LP Causes the HiGain system to transmit...

Страница 34: ...ines the maximum number of fully loaded shelves per bay that does not exceed the maximum allowable power dissipation density in watts sq ft The Maximum Current Drain is the maximum current drawn from...

Страница 35: ...codes to loop up the HLU CREM 6 in 7 or HRU CLOC 5 in 7 toward the customer Either loop up condition is terminated looped down with the 3 in 5 loop down code Both in band codes must be present for fiv...

Страница 36: ...ace it with the AIS code or to unblock it by executing the FAR END ACTIVATE code Since A5LB never blocks the arming code from exiting the HLU 319 List 4B it does not need this FAR END ACTIVATE code A3...

Страница 37: ...the front panel display MAN LPBK followed by the message NLO 2 Do one of the following To execute an NLOC loopback press the SEL button The message changes from NLO to NLOC To execute an NREM loopbac...

Страница 38: ...channels to the customer and the local DSX 1 interface If trouble is encountered on the HLU 319 List 4B DSX 1 interface verify that the HLU 319 List 4B is making a positive connection with its mounti...

Страница 39: ...seconds Verify if possible that an NREM loopback is in effect Loopback states are indicated by the green LOOP LED on the front panel display and on the Span Status screen 2 Have the CO tester transmit...

Страница 40: ...xternal NI has looped up if the SMJK loopback option is disabled and that the HLU 319 List 4B and the HRU 412 List 8B are ARMED 3 Verify if possible that the HRU 412 List 8B Loopback LED is flashing i...

Страница 41: ...001 0011 1001 0011 9393 or issuing the NI LPDN and Disarm code 11100 The automatic time out timer is restored during subsequent loopback sessions 5 Once the test is complete do one of the following If...

Страница 42: ...r end activate another ARM command Table 4 Addressable 1 2 5 A1LB A2LB A5LB Repeater Loopback Commands Name Description Code ARMING or NI LPBK in band Arming code 11000 11000 ARMING or NI LPBK ESF Dat...

Страница 43: ...that the entire arming and loopback sequence can be initiated at the remote HRU location This is the HEX number for the 4 bit group The HRU identifies CREM with 231 bit errors including the frame bits...

Страница 44: ...back Timeout option The loopback time option determines the duration of a loopback unless it is overridden by the reception of a second identical 16 bit loop up command before the timer expires When t...

Страница 45: ...SMJK 11000 11000 11000 HRU LU FROM NI SMJK 100000 100000 100000 HRU LU FROM NI ESF DL SMJK 1111 F 1111 F 0100 4 1000 8 HLU and HRU LD FROM NI OR CI Loopdown 11100 11100 11100 HLU and HRU LD FROM NI O...

Страница 46: ...direct indication of the loop attenuation to the 2B1Q signal than the 196 kHz loss The normal range of pulse attenuation is 1 to 32 dB PPM Indicates the relative offset of the crystal oscillator in th...

Страница 47: ...mber of the HLU 319 List 4B y list number of HLU 319 List 4B HRU Ver a b c a b software version number of the HRU 412 List 8B c list number of HRU 412 List 8B Table 7 HLU 319 List 4B Four Character Fr...

Страница 48: ...319 List 4B and HRU 412 List 8B transceivers are trying to establish contact with each other on loop 2 ACQ1 Acquisition 1 The HLU 319 List 4B and HRU 412 List 8B multiplexers are trying to establish s...

Страница 49: ...ng the correct amount of power over good cable pairs but can not communicate with the HLU 319 List 4B PWR FEED OPEN Power Feed Open Indicates an open circuit in the transmit T and receive R of either...

Страница 50: ...t to the HRU 412 List 8B Causes a minor alarm DS1 DS1 BPV Errors Indicates that the number of BPVs at the HLU 319 List 4B or HRU 412 List 8B T1 inputs have exceeded the 24 hour ES threshold Causes a m...

Страница 51: ...on If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interfere...

Страница 52: ...y the Buyer When the equipment is shipped back to the Buyer PairGain will pay the charges unless no trouble is found NTF in which case the buyer will pay for the shipment PairGain may use reconditione...

Страница 53: ...uty Customer Service Engineer returns technical assistance calls within 30 minutes Returns To return equipment to PairGain 1 Locate the number of the purchase order under which the equipment was purch...

Страница 54: ...or returning the equipment please let us know so we can determine how best to help you 4 Pack the equipment in a shipping carton 5 Write PairGain s address and the Return Material Authorization Number...

Страница 55: ......

Страница 56: ...Corporate Office 14402 Franklin Avenue Tustin CA 92780 Tel 714 832 9922 Fax 714 832 9924 For Technical Assistance 800 638 0031...

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