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PairGain 150-1141-05 Скачать руководство пользователя страница 56

Troubleshooting

150-388-105-05, Revision 05

48

March 25, 2000

HLU-388 List 5

You can terminate loopbacks manually and exit the MAN LPBK mode by simultaneously pressing the MODE
and SEL buttons for 3 or more seconds. If no loopback is active, the MAN LPBK mode automatically terminates
after 30 seconds.

All loopbacks can be initiated by inband commands in the T1 payload or by a command from the HiGain system
(front-panel buttons or maintenance screen selections). When a loopback is active, the method by which it was
activated is indicated in the Loopback and Status screens by the annotation HG (HiGain) or PL (Payload) adjacent
to the identified loopback. For example, NREM (HG) indicates that the loopback was initiated by the HiGain
system.

L

OOPBACK

T

EST

P

ROCEDURES

General Troubleshooting Tips

If trouble is encountered on the DSX-1 interface of the HLU-388, verify that the:

•

HLU is making a positive connection with its mounting assembly (shelf) connector.

•

HLU internal equalizer is set to the correct distance range (see

Table 9 on page 23

). All equalizers should be

set to the distance from the DSX-1 to the shelf.

GNLB Test Procedures

Figure 26 on page 49

is a graphical representation of the various generic loopback configurations with the

associated GNLB commands. See

Table 14 on page 45

for a description of these commands.

To perform the GNLB loopback test procedure:

1

Have the CO tester send the NREM (3-in-7) inband loopup code for 5 seconds. You should be able to observe
the NREM message on the front-panel display. (The Status LED on the front panel should be green, and the
loopback mode should also be identified on the Span Status screen.)

2

Have the CO tester transmit a T1 test signal towards the HLU-388 and verify that the returned (looped) signal
to the test set is error-free.

3

If step 2 fails, have the CO tester transmit the (3-in-5) inband loopdown code.

4

Have the CO tester send the NLOC (4-in-7) inband loopup for 5 seconds. You should be able to observe the
NLOC message on the front-panel display. (The Status LED on the front panel should be yellow, and the
loopback mode should also be identified on the Span Status screen.)

5

Repeat Step 2. If the test passes, the problem is in the downstream direction. If the test fails, the problem is
in the upstream direction.

SMJK loopback commands are only activated by inband commands.

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Содержание 150-1141-05

Страница 1: ...T PAIRGAIN TECHNOLOGIES INC TECHNICAL PRACTICE 150 388 105 05 SECTION 150 388 105 05 MODE SEL M A R G I N dB SETUP STATUS RS 232 DCE HLU 388 H G HD I AIN L 5 HLU 388 List 5 Part Number 150 1141 05 CLE...

Страница 2: ...airGain Technologies Inc and shall not be modified used copied reproduced or disclosed in whole or in part without the written consent of PairGain Information furnished by PairGain Technologies is bel...

Страница 3: ...subject area of the email message INSPECTING THE SHIPMENT Upon receipt of the equipment Unpack each container and visually inspect the contents for signs of damage If the equipment has been damaged in...

Страница 4: ...Inspecting the Shipment 150 388 105 05 Revision 05 iv March 30 2000 HLU 388 List 5...

Страница 5: ..._____________________________________________________________ 11 Using the MODE and SEL Buttons 11 Setting Options through MODE and SEL 11 Resetting to Factory Default Values 12 Displaying System Para...

Страница 6: ...Doublers 56 Maximum Power Dissipation 58 Maximum Current Drain 58 HLU 388 List 5 Card Connector 59 Network Management Control Bus 59 Fuse Alarm 59 Craft Port 60 Appendix B Functional Operation _______...

Страница 7: ...ler 32 13 Performance Data Screen Four Doublers Span 5 32 14 31 Day Performance History Screen No Doubler 33 15 31 Day Performance History Screen Four Doublers Span 5 34 16 Alarm History Screen No Dou...

Страница 8: ...14 Summary of HiGain Loopback Codes 45 15 Addressable Repeater Loopback Commands A1LB A2LB A5LB 50 16 Addressable Repeater Loopback Commands A3LB and A4LB 53 17 HDSL Loss Over Cables 55 18 HLU 388 Po...

Страница 9: ...LOW Grounded loop detection on High bit rate Digital Subscriber Line HDSL Bipolar Violation Transparency BPVT options Bit Error Rate BER alarm options HRU loopback screen Inventory Screen displays Cir...

Страница 10: ...over two unconditioned non loaded copper pairs yet it demonstrates a quality that is competitive with fiber optics Conventional in line T1 repeaters are not required Cable pair conditioning pair separ...

Страница 11: ...U is locally powered the HLU 388 List 5 can power up to four doublers for a total of five spans Personal Communications System Applications The HLU 388 List 5 is required for PCS applications that use...

Страница 12: ...List 5 FRONT PANEL The HLU 388 List 5 front panel is shown in Figure 1 Table 2 on page 5 describes the front panel components For pinout diagrams of the HLU card edge connector refer to HLU 388 List 5...

Страница 13: ...m Alarm Yellow Self Test is in process or an HLU 388 List 5 Customer Remote Loopback CREM or a Network Local Loopback NLOC is in effect Flashing yellow HLU 388 List 5 is armed to respond to Intelligen...

Страница 14: ...to the HRU Causes a system alarm LOOPBACK MESSAGES CDUn Customer Doubler Unit n Loopback Query to initiate loopback at doubler n to CI where n is the number of the doubler CLOC Customer Local Loopback...

Страница 15: ...the HLU 388 LIST xxxx HLU 388 List Number The software list number appears during the System Settings review mode Press the MODE button for 3 seconds to display the list number MNGD Managed The HLU is...

Страница 16: ...ally inspect the contents for signs of damage If the equipment has been damaged in transit immediately report the extent of damage to the transportation company and to PairGain Technologies When insta...

Страница 17: ...attempts to communicate with downstream devices Status LED flashes green One of the following occurs If downstream devices are successfully identified and the HDSL loops synchronize the HLU status LED...

Страница 18: ...he craft port can handle all provisioning tasks Tasks that you need to complete are 1 Setting the time and date see Set Clock Screen on page 21 2 Setting the circuit ID numbers see System Inventory Sc...

Страница 19: ...front panel display alternately shows the first system parameter and its current setting 2 Press the SEL button to step the display through all possible settings of the selected parameter 3 After the...

Страница 20: ...mode Displaying System Parameter Settings To scroll through the current settings of all system parameters press the MODE button for 3 or more seconds The following parameters are displayed HLU softwar...

Страница 21: ...to a maintenance terminal you can access the maintenance provisioning and performance screens To connect to a maintenance terminal 1 Insert the 210 to DB9 adapter into the RS 232 jack on HLU 388 fron...

Страница 22: ...l screens Table 4 Navigational Keys on the Maintenance Terminal Key Function Automatically updates the screen data Updates screen data Clears screen data Selects the next Span Status screen or Selects...

Страница 23: ...ks at both the network and customer side 28 View Performance Data Provides access to subscreens that allow you to view the Errored Seconds ES and Unavailable Seconds UAS between the HLU and the HRU in...

Страница 24: ...tions the available Span Status screens depend on whether the system includes one two three or four doublers Press from the Maintenance Terminal Main Menu to open the Span Status screen Figure 5 on pa...

Страница 25: ...E 1 2 3 4 5 SPAN STATUS TIME 00 27 25 DATE 02 18 00 CIRCUIT ID ALARMS NONE LOOPBACK OFF POWER LEVEL LOW HLU HRU HDSL 1 HDSL 2 HDSL 1 HDSL 2 cur min max cur min max cur min max cur min max MARGIN 21 20...

Страница 26: ...STATUS TIME 12 06 04 DATE 02 18 00 Circuit ID ALARMS NONE LOOPBACK OFF POWER LEVEL HIGH HDU4 HRU HDSL 1 HDSL 2 HDSL 1 HDSL 2 cur min max cur min max cur min max cur min max MARGIN 23 23 23 23 21 23 2...

Страница 27: ...he normal HiGain ATTN operation range is from 0 to 28 dB INS Loss Indicates the approximate insertion loss of the loops at the HDSL line rate of 196 kHz It is generated by multiplying the pulse attenu...

Страница 28: ...e and Loop 2 is specified to carry the simplex DC voltage SPn indicates that the first occurrence of a reversed span is on Span n where n is the number of the span CLOC Customer Local Loopback Loopbac...

Страница 29: ...e Update Remote field appears Update the HRU Time and Date The remote unit s time and date are set by using this option Do one of the following Press to update the HRU to the same time and date set fo...

Страница 30: ...option letter to change that setting Press to set all user options to the factory default values If changes were made press when exiting to confirm or press any other key to ignore changes Press to ex...

Страница 31: ...to the HDSL pair See HDSL Line Voltage Options on page 27 LOW Keeps the HDSL line voltage at 140 Vdc maximum for all applications AUTO Allows the HDSL line voltage to automatically switch between 140...

Страница 32: ...ption on page 26 DS0 BLK The DS0 blocking option can only be set through a maintenance terminal connected to the craft port The four character front panel display only shows the status of the blocking...

Страница 33: ...ystems correct T1 BPVs at the input and thus prevent them from being detected by the DLC terminals to which they are connected The HLU 388 and its associated remote units remove this limitation and be...

Страница 34: ...all HiGain system loopback tests for all DS1 blocking settings This allows the standard full bandwidth T1 loopback tests to be performed for all DS0 blocking settings If any of the unused DS0 channels...

Страница 35: ...alerts the maintenance personnel of the problem 2LP requires both HDSL loops to be out of sync LOSW before the HAIS signal is transmitted 2LP preserves the integrity of the 12 surviving channels when...

Страница 36: ...onal loopback selections appear on the screen Type to exit and return to the previous menu Table 10 lists the HLU 388 Loopback field messages and descriptions If the HLU 388 is used with the HRU 411 t...

Страница 37: ...NLOC C NETWORK LOOP HRU NREM G CUSTOMER LOOP HLU CREM H CUSTOMER LOOP HRU CLOC E xit LOOPBACK MENU TIME 00 03 33 DATE 02 18 00 CIRCUIT ID A DISABLE LOOPBACKS B NETWORK LOOP HLU NLOC M NETWORK LOOP DOU...

Страница 38: ...ce Terminal Main Menu Disabling a Loopback The Disable Loopbacks option Figure 9 on page 29 allows you to disable cancel any of the loopbacks listed in the screen To disable loopbacks press in the Loo...

Страница 39: ...een Press to view the next 4 hour data screen Press to view the next available span for doubler applications Press or to select a specific span for doubler applications Press to exit All Performance D...

Страница 40: ...ifth span HDU4 to the HRU Figure 13 Performance Data Screen Four Doublers Span 5 Date 02 18 00 PERFORMANCE DATA CIRCUIT ID ERRORED SECONDS UNAVAILABLE SECONDS DS1 HDSL 1 HDSL 2 HLU HRU HLU HRU HLU HRU...

Страница 41: ...e History screen press Previous for the previous screen Press to exit from the Performance History screen Performance History Screen without Doubler Figure 14 shows a non doubler application Figure 14...

Страница 42: ...ve span screens Figure 15 31 Day Performance History Screen Four Doublers Span 5 Time 00 26 29 SPAN 5 PERFORMANCE HISTORY 31 DAY CIRCUIT ID ERRORED SECONDS UNAVAILABLE SECONDS DS1 HDSL 1 HDSL 2 HLU HR...

Страница 43: ...escriptions apply to the Alarm History for doubler applications as well Table 12 Alarm History Fields and Descriptions Field Description Type Identifies the type of alarm LOS DS1 HLU First and last in...

Страница 44: ...TE 02 18 00 CIRCUIT ID Type First Last Current Count LOS DS1 HLU OK 000 LOS DS1 HRU OK 000 BER OK 000 SPAN1 LOSW HDSL1 02 01 99 00 00 02 01 99 00 00 OK 001 SPAN1 LOSW HDSL2 02 01 99 00 00 02 01 99 00...

Страница 45: ...tected modules have the product number listed When the HLU 388 loses sync with Span 1 the product types are replaced by the N A label until sync is reestablished and each module can in turn be reident...

Страница 46: ...9 DATE 02 18 00 A CIRCUIT ID UNIT PRODUCT UNIT ID HLU HLU 388 L5 V7 0 NOT REQUIRED B HRU HRU 402 L1A V1 3 Remote Unit C DB1 N A D DB2 N A F DB3 N A G DB4 N A E xit Enter the item letter to change any...

Страница 47: ...21 Troubleshooting Screen Describing Circuit Problem I TIME 00 29 56 TROUBLESHOOTING DATE 02 18 00 CIRCUIT ID ___ ___ ___ ___ ___ ___ 1 1 1 1 1 ___ 2 ___ 2 ___ 2 ___ 2 ___ 2 ___ NETWORK HLU HDU1 HDU2...

Страница 48: ...elp Margin Values or Insertion Loss screens Press to update a screen Press to automatically update the screen Press again to deactivate auto update The Troubleshooting screen indicates whether AutoUpd...

Страница 49: ...lower than 4 dB Low margin is a result of high noise level and or low HDSL signal level Some causes of low margin Long loop External interference Excessive cross talk AUTOUPDATE OFF E xit A uto U pdat...

Страница 50: ...SELF TEST message appears instead of the ALRM message One of the HDSL loops has lost synchronization Cannot be inhibited ALRM LLOS Local Loss of Signal Loss of the DSX 1 input signal Cannot be inhibi...

Страница 51: ...alarm press the SEL button and execute an Alarm Cutoff ACO An ACO turns the alarm off and replaces the ALRM message with an ACO message The second part of the ALRM message which defines the cause of...

Страница 52: ...on the HLU or the Manual Loopback button on the HRU selecting the loopback type from the Maintenance Terminal Main Menu when connected to the craft port of the HLU or HRU entering the loopback code in...

Страница 53: ...1011010 Customer Doubler 4 Invokes HDU4 loopback toward the customer X X X CREM 1111110 6 in 7 Customer Remote Invokes HLU loopback toward the customer X X X SMJK LpUp PL 11000 2 in 5 SmartJack Loopup...

Страница 54: ...ew York Telephone A5LB Teltrend Mod 1 Southern New England Telephone SNET Southwestern Bell Pacific Bell The A1LB loopback selection complies with that proposed for HDSL systems in the T1 E1 4 92 reco...

Страница 55: ...oopback ND1 ND2 ND3 ND4 NRE CRE CD1 CD2 CD3 CD4 CLO 4 Press SEL to activate the selected loopback The previous loopback is terminated Once a loopback is selected and activated it stays active until it...

Страница 56: ...the distance from the DSX 1 to the shelf GNLB Test Procedures Figure 26 on page 49 is a graphical representation of the various generic loopback configurations with the associated GNLB commands See T...

Страница 57: ...RU 412 4 in 7 HRU 412 5 IN 7 CLOC HRU 412 HRU 412 5 IN 7 CLOC HRU 412 HRU 412 5 IN 7 CLOC HRU 412 HRU 412 5 in 7 CLOC All ones HLU HLU HLU HLU HLU HLU HLU HLU HLU HLU HLU HLU HLU HLU HLU HLU HLU 11110...

Страница 58: ...rs detected by the test set varies from 229 to 231 depending on whether or not the test set counts frame errors as bit errors and on the number of frame bits contained in the block of 231 error bits T...

Страница 59: ...if ILR 2 HRU was sent d normal looped data This error pattern repeats every 20 seconds as long as the IOR loopback pattern is being sent This also applies to ILR Time out Override and Query commands...

Страница 60: ...be looped down disarmed and returned to normal operation send the disarm inband code 11100 or the ESF DL code FF24 The Armed mode has an automatic time out of 120 minutes but this timer is reset to 12...

Страница 61: ...Binary Code a Hexadecimal Equivalent a The left most bit arrives first in all sequences The detection algorithm functions reliably with a random 10 3 Bit Error Ratio BER on the facility The entire ar...

Страница 62: ...Impedance 100 DSX 1 Pulse Output 6 pk pk pre equalized for 0 655 feet of ABAM cable DSX 1 Input Level 1 5 to 7 5 dBDSX DS1 Line Rate 1 544 Mbps 200 bps DS1 Line Format AMI B8ZS or ZBTSI DS1 Frame Form...

Страница 63: ...urrent drain Table 18 describes line powered circuits on 9 kft 26 AWG loops without a doubler Table 17 HDSL Loss Over Cables Cable Gauge AWG mm Loop Loss a dB kft a At 196 kHz 68 F 20 C Loop Resistanc...

Страница 64: ...N A OFF 21 23 1 6 3 6 9 494 543 HRU 411 OFF 20 22 0 6 2 6 8 471 518 Table 20 HLU 388 Power Parameters Single Doubler HDU 439 or HDU 437 Lists 1 and 1B HRU Model No HRU CPE Power 42 5 Vdc Power Consum...

Страница 65: ...mum Typical Maximum HRU 412 List 1 2 3 4 OFF 30 3 33 3 8 0 8 8 713 784 HRU 412 List 6 7 8 OFF 28 1 30 9 7 7 8 5 660 726 HRU 402 N A OFF 24 8 27 3 7 2 7 9 584 642 HRU 411 OFF 27 7 30 5 7 5 8 3 652 717...

Страница 66: ...s are determined by applying its power parameters to the manufacturer s requirements for each specific housing The 42 5 Vdc Power Consumption is the maximum total power that the HLU 388 consumes or dr...

Страница 67: ...ent the MNGD message displays periodically on the HLU 388 List 5 front panel display Fuse Alarm Pin 117 on the card edge connector is a Fuse Alarm that is driven to 48 Vdc through a 1000 resistor when...

Страница 68: ...port connector and its connection to a DB 9 or DB 25 connector on a maintenance terminal Figure 28 RS 232 Craft Port Pinouts HLU 388 Female DB9 210 adapter supplied with each unit DB 9 connector DCE...

Страница 69: ...arbitrarily defines a frame bit Figure 29 HLU 388 List 5 Block Diagram TIMING The low loop wander 0 3 UI max of an HLU 388 List 5 when used with compatible doublers HDU 409 HDU 404 or HDU 407 and remo...

Страница 70: ...ects a grounded loop the line power is immediately removed from the spans and a PWR FEED GND alarm is generated and displayed The power is reapplied 30 seconds later as part of a new start up procedur...

Страница 71: ...iGain HLU and HRU modules are compatible with each other Although all HiGain doublers are backward compatible with all prior HLU and HRU models some of the circuit application enhancements of newer do...

Страница 72: ...ne and two doublers only HDU 451 List 3 3B 4 4B HDU 437 439 HDU 404 407 409 Line Powered Local Powered Line Powered Local Powered Line Powered Local Powered HLU Model I CPE ON I CPE OFF I CPE ON I CPE...

Страница 73: ...by a Customer Service Engineer At other times a request for technical assistance is handled by an on duty Customer Service Engineer through a callback process This process normally results in a callba...

Страница 74: ...ss to which PairGain should return the repaired equipment The original purchase order number A description of the equipment that includes the model and part number of each unit being returned as well...

Страница 75: ...ce IOR Intelligent Office Repeater CLEI Common Language Equipment Identifier IR Intelligent Repeater CLOC Customer Local Loopback LED Light Emitting Diode CO Central Office LOS Loss of Signal COM Comm...

Страница 76: ...ror Count RMA Return Material Authorization TLOS LB Transmit Loss of Signal Loopback SAIS SmartJack AIS TSEC Total System Error Count SF Super Frame TSGR Transport System Generic Requirements SMJK Sma...

Страница 77: ...e This warranty also does not apply to any of Seller s Products which have been connected installed used adjusted or in which operating materials have been installed or materials assembled otherwise t...

Страница 78: ...Corporate Office 14402 Franklin Avenue Tustin CA 92780 Tel 714 832 9922 Fax 714 832 9924 For Technical Assistance 800 638 0031 714 730 3222...

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