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Troubleshooting

 150-231-184-05, Revision 05

44

October 25, 1999

 HLU-231 List 8D

Initiating a Manual Loopback Session

To initiate a manual loopback session:

1

Press both the MODE and SEL buttons on the front panel for at least 3 seconds. The message 

MAN LPBK NLO?

 appears on the front panel display:

2

Press SEL to activate NLOC. The display changes to 

MAN LPBK NLOC

.

3

Press MODE to advance to the next available loopback (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, the loopback stays active until it times out (based on the LBTO setting). 
When a loopback times out, the display then returns to the normal display mode.

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.

With the exception of SmartJack, any of the HiGain loopbacks can be executed using the MODE 
and SEL buttons.

When executing a manual loopback session using the MODE and SEL buttons:

•

The next loopback option can be presented by pressing the MODE button; however, the 
previously activated loopback remains active until the SEL button is pressed, which 
activates the new loopback. 

•

If neither button is pressed for a period of 30 seconds and no loopback is in effect, the 
manual loopback session terminates and the display returns to normal mode. 

•

If any loopback is in effect, the 30-second time-out is inhibited. The active loopback and the 
manual loopback session continue until the loopback times out in accordance with the LBTO 
setting. 

•

Only the SMJK loopback can exist with other network loopbacks at any given time. 

•

If there is an active loopback, pressing the MODE and SEL buttons for 3 or more seconds 
terminates any active loopback, ends the manual loopback session and returns the display 
to normal mode. 

SMJK loopback commands are only activated by inband commands.

Содержание T1L2BZ0A

Страница 1: ...HIGAIN LINE UNIT PAIRGAIN TECHNOLOGIES INC ENGINEERING SERVICES TECHNICAL PRACTICE 150 231 184 05 Model List Number Part Number CLEI Code HLU 231 8D 150 1111 84 T1L2BZ0A ...

Страница 2: ...s is believed to be accurate and reliable However no responsibility is assumed by PairGain Technologies for its use nor for any infringement of patents or other rights of third parties which may result from its use No license is granted by implication or otherwise under any patent or patent rights of PairGain Technologies PairGain Technologies reserves the right to change specifications at any tim...

Страница 3: ...ubject 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 transit immediately report the extent of damage to the transportation company and to PairGain Order replacement equipment if necessary Check the packing list to ensure complete and accurate shipment o...

Страница 4: ...Inspecting the Shipment 150 231 184 05 Revision 05 iv October 25 1999 HLU 231 List 8D ...

Страница 5: ...ith a Downstream Device 9 Provisioning Requirements 10 Provisioning_________________________________________________________________________ 11 Using the MODE and SEL Buttons 11 Setting Options through MODE and SEL 11 Resetting to Factory Default Values 12 Displaying System Parameter Settings 12 Disabling an Alarm 12 Loopback Modes 12 Using a Maintenance Terminal 13 Connecting to a Maintenance Ter...

Страница 6: ... without Doubler 30 Performance History Screen for Doubler Applications 7 Day and 31 Day 31 View Alarm History Screen 32 Alarm History Screen without Doubler 33 Alarm History Screen for Doubler Applications 33 System Inventory Screen 34 System Inventory Screen without Doubler 35 System Inventory Screen for Doubler Applications 35 View Troubleshooting Screen 36 Troubleshooting _____________________...

Страница 7: ...larm Relay Output 55 Craft Port 55 Appendix B Functional Operation _____________________________________________________ 56 Timing 56 Ground Fault Detect 57 Appendix C Compatibility ___________________________________________________________ 58 T1 Repeater Shelves and Related Equipment 58 HiGain Doubler Circuit Deployment 58 Appendix D Product Support ______________________________________________...

Страница 8: ... 29 14 7 Day Performance History Screen No Doubler 30 15 31 Day Performance History Screen Four Doublers Span 5 31 16 Alarm History Screen No Doubler 33 17 Alarm History Screen Four Doublers Span 5 33 18 System Inventory Screen No Doubler 35 19 System Inventory Screen Four Doublers 35 20 Troubleshooting Screen for a Doubler Application 36 21 Troubleshooting Screen Describing Circuit Problem 36 22 ...

Страница 9: ...ory Fields and Descriptions 32 12 HDSL System Alarms 40 13 Summary of HiGain Loopback Codes 42 14 Addressable Repeater Loopback Commands A5LB 46 15 HDSL Loss Over Cables 50 16 Power Parameters No Doubler 50 17 Power Parameters Single Doubler HDU 451 List 1 or 2 51 18 Power Parameters Single Doubler HDU 439 or HDU 437 Lists 1 and 1B 51 19 Power Parameters Single Doubler HDU 409 List 2 51 20 Power P...

Страница 10: ...List of Tables 150 231 184 05 Revision 05 x October 25 1999 HLU 231 List 8D ...

Страница 11: ...hancements Fast Loss of Sync Word LOSW reporting Five span range with four doublers 60 kft 24 AWG Four line powered spans three doublers and one remote Reduced power consumption Ultra low wander Stratum 1 compliant Low line power option 140 Vdc for circuits with a single doubler Selectable Power Feed PWRF modes Auto High and Low Grounded loop detection on High bit rate Digital Subscriber Line HDSL...

Страница 12: ... enhanced features of newer HiGain doublers refer to HiGain Doubler Circuit Deployment on page 58 APPLICATIONS HiGain systems provide a cost effective easy to deploy method for delivering T1 High Capacity Digital Service HCDS over metallic pairs The service is deployed over two unconditioned non loaded copper pairs yet it demonstrates a quality that is competitive with fiber optics Conventional in...

Страница 13: ...an power the 200 mW PCS remote radio ports The HLU recognizes the HRU 411 if the Customer Premises Equipment CPE Power switch is set to ON and performs the following two functions required by the HRU 411 to bring up the National Electric Code NEC radio port Increases the HDSL line voltage to its high 112 V level with the PWRF option set to AUTO Enables HRU 411 to turn on its 130 V radio port suppl...

Страница 14: ...ONT PANEL The HLU 231 List 8D front panel is shown in Figure 1 The front panel components are described in Table 1 on page 5 For pinout diagrams of the HLU card edge connector and the craft port refer to Appendix A Specifications on page 49 Figure 1 HLU 231 List 8D Front Panel ...

Страница 15: ...access jacks SPAN Provides splitting jack access to XMT and from RCV the HDSL span at the DSX 1 interface Breaks the XMT and RCV paths to permit test signal insertion and retrieval BRG Provides non intrusive bridging jack access to XMT and from RCV the HDSL span at the DSX 1 interface Allows the two T1 payloads to be monitored Craft RS 232 port Provides bidirectional communication between the unit...

Страница 16: ...tion The Fast LOSW feature is enabled when the Bipolar Violation Transparency BPVT option is enabled see BPVT Option on page 23 MAL1 or MAL2 Margin Alarm Loop 1 or Loop 2 The margin on HDSL Loop 1 or 2 has dropped below the threshold 1 to 15 dB as set by the operator RLOS Remote Loss of Signal Indicates that no signal is detected at the DS1 input to the HRU LOOPBACK MESSAGES CDUn Customer Doubler ...

Страница 17: ...HLU 231 List Number The software list number xxxx appears during the System Settings review mode Press the MODE button for 3 seconds to display the list number MNGD Managed The HLU is under control of the HMU 319 Network Management Unit In this state the front panel craft port and pushbuttons are disabled PWR GND Power Feed Ground One of the HDSL loops has been grounded PWR ON Power Feed On Indica...

Страница 18: ...mbs on the HLU 231 front panel and push the HLU 231 into the card edge connector until it is entirely within the card guides and the retaining latch closes This indicates that the card is properly seated Upon receipt of the equipment visually 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 a...

Страница 19: ...unicate with downstream devices status LED flashes green One of the following occurs a If downstream devices are successfully identified and the HDSL loops synchronize the HLU status LED will be a steady green The HLU reports normal margin messages on the front panel display b If downstream devices are not successfully identified the HLU reports four character status messages and enters self test ...

Страница 20: ...you connect a PC to the craft port can handle all provisioning tasks Complete the following tasks 1 Set the time and date see Set Clock Screen on page 19 2 Set the circuit IDs see System Inventory Screen on page 34 Assuming that the HLU has been successfully installed and provisioned do the following to ensure an accurate Alarm History and Performance History 1 Clear the Span Status Performance Da...

Страница 21: ...rnately 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 desired setting has been selected press the MODE button This updates the currently displayed parameter to the selected setting and then advances to the next configurable parameter After the last parameter has been selected a...

Страница 22: ...default values do one of the following Press the MODE button to return to the normal display mode Wait 30 seconds for the unit to return to the normal display 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 software version number HLU List number Type of ...

Страница 23: ...No parity 8 data bits 1 stop bit Hardware flow control to OFF 5 Press the several times to initiate the autobaud connection and to initialize the Maintenance Terminal screens Accessing the Maintenance Terminal Screens The following sections describe how to use the Maintenance Terminal screens to view provision and diagnose an HLU 231 List 8D system Navigation Keys Table 3 lists keys you can use on...

Страница 24: ...ow you to view the Errored Seconds ES and Unavailable Seconds UAS between the HLU and the HRU in 15 minute intervals over a 4 hour time period per screen for a total of 24 hours 6 screens 28 View Performance History 7 Day Provides access to subscreens that allow you to view the ES and UAS between the HLU and the HRU in 24 hour intervals over a 7 day period 30 View Performance History 31 Day Provid...

Страница 25: ... 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 page 16 If no doubler HDU is present the screen reports span status for the subscriber lines between the HLU and the HRU If there are additional doublers the Span Status screen reports status on each span Fi...

Страница 26: ...00 00 00 dB INS LOSS 00 00 00 00 dB 24 HOUR ES 00004 00003 00006 00007 seconds 24 HOUR UAS 00014 00013 00000 00001 seconds DS1 STATUS HLU HRU 24 HOUR ES Count 00001 00002 24 HOUR UAS Count 00000 00002 Frame type ESF ESF Code type AMI AMI AUTOUPDATE OFF E xit C lear A uto U pdate SPAN 5 STATUS TIME 12 06 04 DATE 10 08 99 Circuit ID ALARMS NONE LOOPBACK OFF POWER LEVEL HIGH HDU4 HRU HDSL 1 HDSL 2 HD...

Страница 27: ...e cable pair The pulse attenuation is a more direct indication of the loop attenuation to the 2B1Q signal than is the 196 kHz loss The 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 attenuation by 1 25 Normal range is 0 dB to 35 dB 24 Hour ES The number of...

Страница 28: ... the MODE and SEL buttons on HLU 231 List 8D front panel or by the maintenance terminal CLOC Customer Local Loopback Loopback at HRU local to CI initiated from Customer Premises Equipment CPE by the ILR 2 code the MODE and SEL buttons on the HLU 231 front panel or by the maintenance terminal CREM Customer Remote Loopback Loopback at HLU 231 remote to customer initiated by Intelligent Office Repeat...

Страница 29: ...y format then press The Update Remote field appears Update the HRU Date and Time Use this option to set the remote unit date and time Press to update the HRU to the same date and time set for the HLU 231 List 8D Press The remote unit is not updated Time information is lost when power is removed The last date however is retained in NVRAM and reappears when power is restored When editing entries in ...

Страница 30: ...ave the following options at the Systems Settings screen Press the desired 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 exit and return to the main menu C SYSTEM SETTINGS TIME 00 01 54 DATE 10 08 99 CIRCUIT ID A EQUALIZATION EXT K MARGIN ALARM THR...

Страница 31: ...contacts on pins 20 and 21 of the card edge connector and flashes the red Status LED when the BER exceeds 10 6 See BER Option on page 23 1E 7 Activates closes the system alarm relay contacts on pins 20 and 21 of the card edge connector and flashes the red Status LED when 10 6 BER 10 7 NONE Prevents generation of a system alarm due to BER Loopback Timeout a LBTO NONE Disables automatic time out can...

Страница 32: ...t its DS1 ports for LOSW T1 LOS and Margin alarms LOS Enables HiGain to output an LOS condition at its DS1 ports for LOSW T1 LOS and Margin alarms Remote Provisioning RTPV ENA Enables provisioning at the remote end when remotely logged in DIS Disables remote provisioning Bipolar Violation Transparency See BPVT Option below BPVT ENA Enables BPVs and HDSL CRC errors at the DS1 input to be converted ...

Страница 33: ...HDSL loop of each span are counted and added in with the BPV count to produce a Total Error Count TEC that indicates the integrity of both the T1 and HDSL paths A TEC in each direction is calculated each second by adding the number of BPVs to the number of HDSL CRCs in that direction The maximum TEC count is 12 000 This TEC number is converted into BPVs at the distant end during the following seco...

Страница 34: ...ally powered two doubler circuits up to 140 V if the appropriate HiGain products HDU 409 HDU 404 or HDU 407 and HRU 402 or HRU 411 are used along with the HLU 231 List 8D These HiGain units are the only ones that have sufficiently low power consumption to allow their doubler circuits to be line powered from 140 V The HRU 411 must have the CPE power option disabled if it is used in a 140 V doubler ...

Страница 35: ...ect HRU Network Loop Type to select HLU Customer Loop Type to select HRU Customer Loop For doubler applications additional loopback selections appear on the screen Type to exit and return to the previous menu Table 9 lists the HLU 231 Loopback field messages and descriptions Table 9 Loopback Field Messages and Descriptions Messages Full Name Description NREM Network Remote Loopback Loopback at HRU...

Страница 36: ...U 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 10 08 99 CIRCUIT ID A DISABLE LOOPBACKS B NETWORK LOOP HLU NLOC M NETWORK LOOP DOUBLER 4 NDU4 C NETWORK LOOP HRU NREM N CUSTOMER LOOP DOUBLER 4 CDU4 D NETWORK LOOP DOUBLER 1 NDU1 F NETWORK LOOP DOUBLER 2 NDU2 G CUSTOMER LOOP HLU CREM H CUSTOMER LOOP HRU CLOC I CUSTOMER LOOP DOUBL...

Страница 37: ...al Main Menu Disabling a Loopback The Disable Loopbacks option Figure 9 on page 26 allows you to disable cancel any of the loopbacks listed in the screen To disable loopbacks press in the Loopback Menu The following prompt appears PLEASE WAIT A series of dots moves from left to right indicating that the command has been issued When this process completes the system returns to the Maintenance Termi...

Страница 38: ...een 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 Data counters can be set to zero by pressing clear from the HLU 231 Span Status screen shown in Figure 5 on page 16 The HLU 231 is considered the master module it clears all performance data screens at both the HLU 231 and the HRU Counters can...

Страница 39: ...e fifth span HDU4 to the HRU Figure 13 Performance Data Screen Four Doublers Span 5 Date 10 08 99 PERFORMANCE DATA CIRCUIT ID ERRORED SECONDS UNAVAILABLE SECONDS DS1 HDSL 1 HDSL 2 HLU HRU HLU HRU HLU HRU 00 00 00 15 00 30 00 45 01 00 01 15 01 30 01 45 02 00 02 15 02 30 02 45 03 00 03 15 03 30 03 45 001 002 002 004 014 006 003 013 007 001 E xit P revious N ext Date 10 08 99 SPAN 5 PERFORMANCE DATA ...

Страница 40: ...s From the 31 day Performance History screen press next for a continued history From the 31 day Performance 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 7 day history for a non doubler application Figure 14 7 Day Performance History Screen No Doubler All Performance History count...

Страница 41: ... of a 31 day screen showing data for the fifth span between HDU4 and the HRU Figure 15 31 Day Performance History Screen Four Doublers Span 5 Time 03 09 34 Span 5 PERFORMANCE HISTORY 31 DAY CIRCUIT ID ERRORED SECONDS UNAVAILABLE SECONDS DS1 HDSL 1 HDSL 2 HLU HRU HDU4 HRU HDU4 HRU 09 17 09 18 09 19 09 20 09 21 09 22 09 23 09 24 09 25 09 26 09 27 09 28 09 29 00001 00005 00415 00035 00492 09 30 10 01...

Страница 42: ...story screens for doubler and non doubler applications Table 11 Alarm History Fields and Descriptions Field Description Type Identifies the type of alarm LOS DS1 HLU First and last instance of LOS at the HLU Current condition number of alarms LOS DS1 HRU First and last instance of LOS at the HRU Current condition number of alarms BER First and last instance of a BER at the HRU Current condition nu...

Страница 43: ... 10 08 99 CIRCUIT ID Type First Last Current Count LOS DS1 HLU OK 000 LOS DS1 HRU OK 000 BER OK 000 SPAN1 LOSW HDSL1 10 08 99 00 00 10 08 99 00 00 OK 001 SPAN1 LOSW HDSL2 10 08 99 00 00 10 08 99 00 00 OK 001 SPAN1 MARGIN L1 OK 000 SPAN1 MARGIN L2 OK 000 PWR SHRT OK 000 PWR GND OK 000 LAST CLEARED 10 08 99 00 01 E xit C lear U pdate ALARM HISTORY TIME 13 59 20 DATE 10 08 99 CIRCUIT ID Type First La...

Страница 44: ...t number listed When the HLU 231 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 reidentified Only the Circuit ID appears in the other HLU 231 List 8D Terminal Maintenance screens Press at the Maintenance Terminal Main Menu to display the System Inventory screen Figure 18 and Figure 19 on page 35 From each System Inv...

Страница 45: ... TIME 00 27 59 DATE 10 08 99 A CIRCUIT ID UNIT PRODUCT UNIT ID HLU HLU 231 L8D V7 2 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 the ID SYSTEM INVENTORY TIME 18 16 37 DATE 10 08 99 A CIRCUIT ID UNIT PRODUCT UNIT ID HLU HLU 231 L8D V7 1 NOT REQUIRED B HRU HRU 402 L1A V1 3 Remote Unit C DB1 HDU 404 L2 V1 2 D DB2 HDU 404...

Страница 46: ...he type of problem Figure 21 Troubleshooting Screen Describing Circuit Problem J TIME 17 34 31 TROUBLESHOOTING DATE 10 08 99 CIRCUIT ID ___ ___ ___ ___ ___ ___ 1 1 1 1 1 ___ 2 ___ 2 ___ 2 ___ 2 ___ 2 ___ NTWK HLU HDU1 HDU2 HDU3 HDU4 HRU CUST SYSTEM OPERATIONAL AUTOUPDATE OFF E xit A uto U pdate H elp L oopbacks Signal Direction Doubler HDSL LIne 1 HDSL LIne 2 TIME 17 36 07 TROUBLESHOOTING DATE 10 ...

Страница 47: ...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 AutoUpdate is on or off Press to directly access the Loopback menu see Loopback Mode Screen on page 25 Figure 22 Troubleshooting with Help H M I H M I E B U A A L TIME 17 35 05 TROUBLESHOOTING with HELP DATE 10 08 99 CIRCUIT ID ...

Страница 48: ...n 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 pdate B ack L oopbacks I TIME 01 34 56 TROUBLESHOOTING with INSERTION LOSS VALUES DATE 09 20 99 CIRCUIT ID ___ ___ ___ ___ ___ ___ 01 00 00 01 00 00 00 00 00 01 ___ 01 00 ___ 00 01 ___ 00 00 ___ 00 00 _...

Страница 49: ...n the graph indicates a DS1 error has occurred The maximum value can be displayed is 999 Some causes of HDSL errors Shorts interference noise Some causes of DS1 errors Bipolar Violation Framing error CRC error AUTOUPDATE OFF E xit A uto U pdate B ack L oopbacks N O O TIME 01 35 12 TROUBLESHOOTING with 24 HOUR UAS DATE 09 20 99 CIRCUIT ID ___ ___ ___ ___ ___ ___ 135 013 002 022 002 178 001 030 002 ...

Страница 50: ... Loss of Signal Loss of the DSX 1 input signal Cannot be inhibited ALRM RLOS Remote Loss of Signal Loss of the HRU DS1 input signal Disable the RDA Remote DS1 Alarm option This prevents an LOS condition at the DS1 input to an HRU from closing the alarm contacts pins 20 and 21 on the card edge connector The front panel Status LED still flashes red and the ALRM RLOS message displays to alert you of ...

Страница 51: ...s are not in sync has been enhanced to include the input DS1 transceiver chip The Self Test procedure can cause the all ones pattern which is normally transmitted from the HLU 231 during these out of sync intervals to exhibit occasional BPVs LOOPBACK OPERATION HiGain has a fixed A5LB Addressable Repeater Loopback Figure 27 for analyzing circuit functionality The loopback signal is transmitted and ...

Страница 52: ...and CREM D3D3 IOR LPBK 231 2 bit errors X X X NDU1 and CDU1 C741 ILR 1 LPBK 10 bit errors X X X NDU2 and CDU2 C754 ILR 20 LPBK 200 bit errors X X X NDU3 and CDU3 C743 ILR 3 LPBK 30 bit errors X X X NDU4 and CDU4 C744 ILR 4 LPBK 40 bit errors X X X NREM and CLOC C742 ILR 2 LPBK 20 bit errors X X X HiGain systems feature the SmartJack option which can emulate a Network Interface Device NID for the p...

Страница 53: ...ds from exiting the HLU into the network and replace it with the AIS code Unblock the AIS code by executing the Far End Activate code Since A5LB never blocks the arming code from exiting the HLU the Far End Activate code is not available in A5LB Manual Loopback Session A manual loopback session allows you to select any one of the HiGain A5LB loopbacks listed in Table 13 on page 42 with the excepti...

Страница 54: ... 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 With the exception of SmartJack any of the HiGain loopbacks can be executed using the MODE and SEL buttons When executing a manual loo...

Страница 55: ... the DS1 channels to the customer and the local DSX 1 interface General Troubleshooting Tips If trouble is encountered on the DSX 1 interface of the HLU 231 List 8D 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 per Table 8 on page 21 All equalizers should be set to the distance from the DSX...

Страница 56: ...a is being sent in the AUTO framing mode the number of the 231 bit errors 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 The HRU and HLU generate this bit pattern in a series of discontinuous bursts containing 20 bit errors each including frame bits T...

Страница 57: ...Doubler 2 was sent 30 errors if ILR 3 Doubler 3 was sent 40 errors if ILR 4 Doubler 4 was sent 20 errors 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 The HLU is now in logic loopback if the IOR NLOC loopback command was sent The Time out Override...

Страница 58: ...me out of 120 minutes but this timer is reset to 120 for any of the following events Loopback terminates manually or time out Query Alternate query Far end activate Another ARM command This timer is inhibited while any of the valid command codes are being sent Once the codes are removed the timer restarts at 120 ...

Страница 59: ...SX 1 Line Impedance 100 DSX 1 Pulse Output 6 V pk pk pre equalized for 0 to 655 feet of ABAM cable DSX 1 Input Level 1 5 to 7 5 dB DSX DS1 Line Rate 1 544 Mbps 200 bps DS1 Line Format AMI or B8ZS DS1 Frame Format ESF SF Maximum Heat Dissipation See Power Consumption on page 50 Fusing Internal connected to Fuse Alarm output on pin 32 HDSL Span Voltage 140 V or 112 Vdc Electrical Protection Secondar...

Страница 60: ...its maximum current drain Table 16 describes line powered circuits on 9 kft 26 AWG loops without a doubler Table 15 HDSL Loss Over Cables Cable Gauge AWG mm Loop Loss a dB kft a At 196 kHz 68 F 20 C Loop Resistance per kft 26 0 4 3 88 83 24 0 51 2 84 52 22 0 61 2 18 32 19 0 91 1 54 16 A Windows based program Cable Calculator may be downloaded from the Customer Site portion of PairGain s web site a...

Страница 61: ...628 HRU 402 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 18 Power Parameters Single Doubler HDU 439 or HDU 437 Lists 1 and 1B HRU Model No HRU CPE Power 42 5 V Power Consumption Watts Heat Dissipation Watts 42 5 V Current mA Typical Maximum Typical Maximum Typical Maximum HRU 412 List 1 2 3 4 ON 22 3 24 5 7 9 8 6 525 578 HRU 412 List 1 2 3 4 OFF 21 4 23 5 7 8 8 5 502 5...

Страница 62: ...ximum 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 Table 22 Power Parameters Two Doublers HDU 409 List 2 HRU Model No HRU CPE Power 42 5 VPowerConsumption Watts Heat Dissipation Watts 42 5 V Current mA Typical Maximum Typical Maximum Typical Maximum...

Страница 63: ...ures are determined by applying its power parameters to the manufacturer s requirements for each specific housing The 42 5 V Power Consumption is the maximum total power that the HLU 231 consumes or draws from the shelf power source This parameter is needed when the HLU 231 is in a location remote to the CO it is serving It determines the battery capacity required to maintain an 8 hour stand by ba...

Страница 64: ... Control Bus The HLU 231 List 8D provides a Network Management Control Bus on pin 46 of the card edge connector This allows the various PairGain Management System protocols to manage the HLU through the HMU 319 HiGain Management Unit When the HLU 231 is under management the MNGD message displays periodically on the HLU 231 List 8D front panel display Some HLU 231 List 8D features are affected when...

Страница 65: ...Relay Output The normally open alarm contacts available across pins 20 and 21 Figure 29 on page 54 comprise the HLU 231 List 8D system alarm output These alarm contacts close for any system alarms condition See Troubleshooting on page 40 for further information CRAFT PORT Figure 30 shows the pinout for the craft port connector and its connection to a DB 9 or DB 25 connector on a maintenance termin...

Страница 66: ...1 is shown in Figure 31 The HLU 231 receives a 1 544 Mbps DSX 1 data stream from the DSX 1 digital cross connect interface The HLU 231 contains a DS1 frame synchronizer controlled by an 8 bit microprocessor that determines the type of framing on the DS1 stream and synchronizes to it The HLU 231 recognizes Superframe SF including D4 or Extended Superframe ESF framing When the data is unframed the H...

Страница 67: ... high voltage applications 112 V When the circuit is active the system is compliant with Class A2 requirements of GR 1089 When the circuit is not active the system is compliant with Class A3 requirements of GR 1089 When the GFD circuit detects 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 l...

Страница 68: ...lication enhancements of newer doubler models require that all circuit modules be of the same product release date in order to realize these enhancements Enhanced doubler applications preclude the mixing of newer doubler models with older models of the HRU and HLU Table 24 on page 59 provides a matrix of HiGain doubler deployment rules to achieve maximum circuit enhancement It lists Maximum number...

Страница 69: ...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 OFF I CPE ON I CPE OFF I CPE ON I CPE OFF I CPE ON I CPE OFF I CPE ON I CPE OFF HLU 231 Lists 3D 6D HLU 319 List 2X HLU 388 List 2X 1 1 2 2 1 1 2 2 1 1 2 2 HLU 231 List 7X HLU 431 List 1D 1 1 2 2 1 2 b b 2000 maximum lo...

Страница 70: ...rectly 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 callback within 30 minutes of initiating the request WORLD WIDE WEB PairGain product and company information can be found at http www pairgain com using any Web browser To download PairGain product m...

Страница 71: ...r b The original purchase order number c A description of the equipment as well as the number of units that you are returning Be sure to include the model and part number of each unit d The shipping address to which PairGain should return the repaired equipment e The reason for the return The equipment needs an ECO ECN upgrade The equipment is defective If there is another reason for returning the...

Страница 72: ... IOR Intelligent Office Repeater CI Customer Installation IR Intelligent Repeater CLEI Common Language Equipment Identifier LED Light Emitting Diode CLOC Customer Local Loopback LOS Loss of Signal CO Central Office LOSW Loss of Sync Word CPE Customer Premises Equipment NEC National Electric Code CRC Cyclic Redundancy Check NI Network Interface CREM Customer Remote Loopback NID Network Interface De...

Страница 73: ...lossary HLU 231 List 8D October 25 1999 63 RLOS Remote Loss of Signal RMA Return Material Authorization SAIS SmartJack AIS SF Super Frame SMJK SmartJack TEC Total Error Count TSEC Total System Error Count UAS Unavailable Seconds XMT Transmit ...

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Страница 75: ...tion Do not try to repair the unit If it fails replace it with another unit and return the faulty unit to PairGain for repair Any modifications of the unit by anyone other than an authorized PairGain representative voids the warranty If a unit needs repair call PairGain for a Return Material Authorization RMA number and return the defective unit freight prepaid along with a brief description of th...

Страница 76: ...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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