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PAIRGAIN TECHNOLOGIES

Section 150-431-114

Technical Practice

Release 01

Engineering - PLANT Series

January 17, 1997

Page 1

AIR

AIN

ECHNOLOGIES

AIN

INE

NIT

MODEL HLU-431

List 1D, PairGain #150-1504-14, CLEI Code: T1L2FKDAAA

CONTENTS

PAGE

A. PRODUCT OVERVIEW

(Doubler and Non-Doubler)

DESCRIPTION AND FEATURES

HIGAIN SYSTEM APPLICATIONS

FUNCTIONAL OPERATION

ALARMS

SYSTEM OPTIONS

HDSL LINE VOLTAGE OPTION

11. TECHNICAL ASSISTANCE

B. APPLICATIONS WITHOUT HIGAIN

DOUBLERS (HDU-451)

12. SECTION INTRODUCTION

13. POWER CONSUMPTION

14. LOOPBACK OPERATION

15. TESTING

16. SYSTEM MAINTENANCE MENU

SCREENS

C. APPLICATIONS USING HIGAIN DOUBLERS

(HDU-451)

17. DOUBLER DEPLOYMENT RULES

18. POWER CONSUMPTION

19. LOOPBACK OPERATION

20. TESTING

21. SYSTEM MAINTENANCE MENU

SCREENS

Figure 1. HLU-431, List 1D Front Panel.

The PairGain

HLU-431 is the local unit used in conjunction with the HRU-412
remote unit to provide a complete HiGain HDSL system.

CAUTION

This product incorporates static sensitive

components. Proper electrostatic discharge

procedures must be followed.

Summary of Contents for HLU-431

Page 1: ...1 10 WARRANTY 12 11 TECHNICAL ASSISTANCE 12 B APPLICATIONS WITHOUT HIGAIN DOUBLERS HDU 451 12 SECTION INTRODUCTION 13 13 POWER CONSUMPTION 13 14 LOOPBACK OPERATION 13 15 TESTING 15 16 SYSTEM MAINTENAN...

Page 2: ...HDSL interfaces 784 kbps full duplex 2B1Q HDSL transmission on two pairs Front panel status indicating LED On Off front panel display power cycling DS1 LOS detector 125 consecutive zeros Margin thres...

Page 3: ...704 bits 6 milliseconds in length The HDSL frames contain a 14 bit Frame Sync Word FSW 6 bit Cyclic Redundancy Check CRC 21 bit operations channel and DSX 1 payload The DSX 1 stream is separated into...

Page 4: ...faces Switch S2 allows the user to configure the HDSL line powering voltage to be unipolar 0 to 130 V and 0 to 200 V or bipolar 65 V and 100 V see Figure 5 The line power supply can be turned on or of...

Page 5: ...lose sync word LOSW a minor alarm condition exists but because the HLU 431 List 1D enters a self test cycling mode the front panel LED lights yellow instead of red and the SELF TEST message is display...

Page 6: ...ing the SEL button for six seconds until the message DFLT NO appears To set the default values press the SEL button while the DFLT NO message is displayed DFLT YES will be displayed indicating the fac...

Page 7: ...s E to Exit and C to Confirm the changes This activates the new choices and returns control to the Main Menu screen 5 11 The new T1 transceiver chip in the List 2D allows the unit to process both B8ZS...

Page 8: ...m to respond to the Teltrend Mod 1 addressable repeater in band loopback codes PWRF DIS Disables powering to the HRU 412 and doubler ENA Enables powering to the HRU 412 and doubler ZBTS ON Tells the H...

Page 9: ...signal at both the HLU 431 List 1D and HRU 412 T1 output ports when both of the HDSL loops are not in sync LOSW 1LP Causes the HiGain system to transmit the AIS signal at both the HLU 431 List 1D and...

Page 10: ...ng reduces the maximum ground referenced voltage to 100 V but applies positive voltage to the cable pairs which could accelerate corrosion on the cable pairs 6 04 The line voltage power supply used fo...

Page 11: ...6 Watts without doubler 9 Watts with doubler Fusing Internal connected to Fuse Alarm output on pin 25 HDSL Span Voltage Differential 130 or 200 Vdc Margin Indicator Displays HDSL loop SNR margin for...

Page 12: ...n Avenue Tustin CA 92680 ATTN Repair and Return Dept 714 832 9922 800 638 0031 11 TECHNICAL ASSISTANCE 11 01 PairGain Technical Assistance is available 24 hours a day 7 days a week by contacting PairG...

Page 13: ...standard 14 slot 23 inch HLU 431 List 1D shelf is 7 024 sq ft Thus the maximum bay dissipation is limited to 840 Watts At 6 Watts per slot this limits the number of occupied slots to 140 per bay 13 0...

Page 14: ...3LB and A4LB are patterned after the Wescom addressable T1 repeater loopbacks All four SPLBs have been enhanced to handle the specific requirements of the following HiGain system customers A2LB Teltre...

Page 15: ...rns the display to normal Note that these same loopbacks can be initiated from the RS 232 maintenance port by choosing the Loopback Mode option D from the Main Menu This displays the Loopback Menu see...

Page 16: ...14 Release 01 Page 16 Figure 6 HLU 431 List 1D Non Doubler Loopback Configurations The most important of the HiGain family of loopback options is the Smart Jack loopback which emulates the functions o...

Page 17: ...mal 4 Have the CO tester send the HLU 431 List 1D 4 in 7 in band loop up code for five seconds Observe that the HLU 431 List 1D displays the NLOC message which indicates that an HLU 431 List 1D loopba...

Page 18: ...n the returned pattern 20 errors if ILR 2 was sent followed by Normal looped data Note This error pattern will repeat every 20 seconds as long as the IOR loopback pattern is being sent This same 20 se...

Page 19: ...pback 1101 0101 1110 1010 D5EA TIME OUT OVERRIDE Loopback Time out Override 1101 0101 1101 0110 D5D6 FAR END NI ACTIVATE Unblock AIS and pass 2 in 5 1100 0101 0101 0100 C554 IOR POWER DOWN HLU Removes...

Page 20: ...n 20 errors if ILR 2 was sent followed by Normal looped data Note This error pattern will repeat every 20 seconds as long as the IOR loopback pattern is being sent This same 20 second repeat scenario...

Page 21: ...ack 1101 0101 1110 1010 D5EA TIME OUT OVERRIDE Loopback Time out Override 1101 0101 1101 0110 D5D6 FAR END NI ACTIVATE Unblock AIS and pass 2 in 5 1100 0101 0101 0100 C554 IOR POWER DOWN HLU Removes H...

Page 22: ...d to execute all the HiGain loopbacks see Figure 6 Note that all code sequences must be present for at least five seconds ABBREVIATIONS USED BELOW LU Loop Up LD Loop Down NI Network Interface CI Custo...

Page 23: ...the codes required to execute all the HiGain system loopbacks see Figure 6 Note that all code sequences must be present for at least five seconds ABBREVIATIONS USED BELOW LU Loop Up LD Loop Down NI Ne...

Page 24: ...e bits occur in the returned pattern 20 errors if ILR 2 was sent followed by Normal looped data Note This error pattern will repeat every 20 seconds as long as the IOR loopback pattern is being sent T...

Page 25: ...ERNATE QUERY LPBK Alternate Query Loopback 1101 0101 1110 1010 D5EA TIME OUT OVERRIDE Loopback Time out Override 1101 0101 1101 0110 D5D6 IOR POWER DOWN HLU Removes HDSL line power 0110 0111 0110 0111...

Page 26: ...RAIS Remote Alarm Indicating Signal Indicates an AIS all 1 pattern is being transmitted from the remote T1 output port LAIS Local Alarm Indicating Signal Indicates an AIS all 1 pattern is being trans...

Page 27: ...see Figure 6 initiated from CO network by either the Intelligent Office Repeater IOR code the HLU 431 front panel Manual Loopback push buttons or the maintenance terminal CLOC Customer Local Loopback...

Page 28: ...period Earlier and later data in four hour chunks on six different screens can be accessed by pressing P Previous or N Next respectively All of the counters can be set to zero by pressing C Clear fro...

Page 29: ...of tolerance components or excessive temperature drift in critical components HDSL 24 Hours ES Errored Seconds The number of 1 second intervals which contained at least 1 HDSL CRC error This value is...

Page 30: ...loop 1 SIG2 Signal 2 The HLU and HRU transceivers are trying to establish contact with each other on loop 2 ACQ1 Acquisition 1 The HLU and HRU multiplexers are trying to establish synchronization ove...

Page 31: ...MI B8ZS The line code that HLU 431 List 1D is receiving at its DSX 1 interface if the DS1 option is set to Auto Otherwise it mimics either of the other two DS1 line code settings AMI or B8ZS Displayed...

Page 32: ...Section 150 431 114 Release 01 Page 32 Figure 7 HLU 431 List 1D Main Menu Figure 8 HLU 431 List 1D Non Doubler Status Display...

Page 33: ...Section 150 431 114 Release 01 Page 33 Figure 9 HLU 431 List 1D Set Clock Menu Figure 10 HLU 431 List 1D System Settings Menu...

Page 34: ...Section 150 431 114 Release 01 Page 34 Figure 11 HLU 431 List 1D Non Doubler Loopback Menu Figure 12 HLU 431 List 1D Non Doubler Performance Data Screen...

Page 35: ...Section 150 431 114 Release 01 Page 35 Figure 13 HLU 431 List 1D Non Doubler 7 Day Performance History Screen Figure 14 HLU 431 List 1D Non Doubler Alarm History Screen...

Page 36: ...er a worst case application The worst case application for the HLU 431 List 1D occurs on a loop with one HDU doubler four 9000 ft 26 AWG spans and an HRU 412 that is providing 60 mA of CPE current Und...

Page 37: ...hould be placed between every other shelf in racks containing more than two shelves This technique deflects the rack heat outward and reduces thermo stress on the plugs 19 LOOPBACK OPERATION 19 01 The...

Page 38: ...08 When T1 loopback tests are performed on the HiGain system with metallic loopback connections at either end the T1 code which exists at the metallic loopback interface may be different from the T1...

Page 39: ...rification of 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 20 02 The HLU 431 List 1D 4 character front panel di...

Page 40: ...431 114 Release 01 Page 40 Figure 15 HLU 431 Doubler Loopback Configurations The most important of the HiGain family of loopback options is the Smart Jack loopback which emulates the functions of a s...

Page 41: ...ir or the HRU 412 If it fails the problem is in the CO equipment 6 The NREM and NLOC loopbacks can also be initiated from the front panel of the HLU 431 List 1D with the Mode and SEL push buttons see...

Page 42: ...rors if ILR 1 was sent 200 errors if ILR 20 was sent and 20 errors if ILR 2 was sent followed by Normal looped data Note This error pattern will repeat every 20 seconds as long as the IOR loopback pat...

Page 43: ...uery Loopback 1101 0101 1101 0101 D5D5 IR ALTERNATE QUERY LPBK Alternate Query Loopback 1101 0101 1110 1010 D5EA TIME OUT OVERRIDE Loopback Time out Override 1101 0101 1101 0110 D5D6 FAR END NI ACTIVA...

Page 44: ...rors if ILR 1 was sent 200 errors if ILR 20 was sent and 20 errors if ILR 2 was sent followed by Normal looped data Note This error pattern will repeat every 20 seconds as long as the IOR loopback pat...

Page 45: ...uery Loopback 1101 0101 1101 0101 D5D5 IR ALTERNATE QUERY LPBK Alternate Query Loopback 1101 0101 1110 1010 D5EA TIME OUT OVERRIDE Loopback Time out Override 1101 0101 1101 0110 D5D6 FAR END NI ACTIVA...

Page 46: ...t five seconds ABBREVIATIONS USED BELOW LU Loop Up LD Loop Down NI Network Interface CI Customer Interface ESF DL Extended Super Frame Data Link ADDRESSABLE 3 A3LB REPEATER LOOPBACK COMMANDS Position...

Page 47: ...be present for at least five seconds ABBREVIATIONS USED BELOW LU Loop Up LD Loop Down NI Network Interface CI Customer Interface ESF DL Extended Super Frame Data Link ADDRESSABLE 4 A4LB REPEATER LOOP...

Page 48: ...was sent 200 errors if ILR 20 was sent and 20 errors if ILR 2 was sent followed by Normal looped data Note This error pattern will repeat every 20 seconds as long as the IOR loopback pattern is being...

Page 49: ...0011 1001 0011 9393 IR QUERY LPBK Query Loopback 1101 0101 1101 0101 D5D5 IR ALTERNATE QUERY LPBK Alternate Query Loopback 1101 0101 1110 1010 D5EA TIME OUT OVERRIDE Loopback Time out Override 1101 0...

Page 50: ...nly NLOC NREM CLOC and CREM are available for non doubler applications 21 07 Figure 24 through Figure 27 show the Performance Data screens for doubler applications The Errored Seconds and Unavailable...

Page 51: ...sage Full Name Description ALARMS NONE No Alarms None indicates no alarms LLOS Local Loss of Signal No signal from HLU 431 List 1D local DSX 1 interface RLOS Remote Loss of Signal No signal from HRU 4...

Page 52: ...ack The loopback at doubler 2 toward network see Figure 15 initiated by either the IOR code the HLU 431 front panel Manual Loopback push buttons or the maintenance terminal CLOC Customer Local Loopbac...

Page 53: ...DSL 24 Hours ES Errored Seconds The number of 1 second intervals which contained at least 1 HDSL CRC error This value is a running total of the last 24 hours HDSL 24 Hours UAS Unavailable Seconds The...

Page 54: ...Signal 1 The HLU and the first doubler transceivers are trying to establish contact with each other on loop 1 of span 1 SIG2 Signal 2 The HLU and the first doubler transceivers are trying to establish...

Page 55: ...Intelligent Repeater loop codes ACO Alarm CutOff A minor alarm occurred and was retired to an ACO condition after pressing the SEL button on the HLU front panel SELF TEST Self test The HLU is in a sel...

Page 56: ...larm LLOS Local Loss of Signal Indicates that no signal is detected at the DSX 1 input to the HLU Causes a minor alarm RLOS Remote Loss of Signal Indicates that no signal is detected at the DS1 input...

Page 57: ...Section 150 431 114 Release 01 Page 57 Figure 16 HLU 431 List 1D Main Menu Figure 17 HLU 431 List 1D Status Display Span 1 1 or 2 Doublers...

Page 58: ...Section 150 431 114 Release 01 Page 58 Figure 18 HLU 431 List 1D Status Display Span 2 1 Doubler Figure 19 HLU 431 List 1D Status Display Span 2 2 Doublers...

Page 59: ...Section 150 431 114 Release 01 Page 59 Figure 20 HLU 431 List 1D Status Display Span 3 2 Doublers Figure 21 HLU 431 List 1D Set Clock Menu...

Page 60: ...Section 150 431 114 Release 01 Page 60 Figure 22 HLU 431 List 1D System Settings Menu Figure 23 HLU 431 List 1D Doubler Loopback Menu...

Page 61: ...Section 150 431 114 Release 01 Page 61 Figure 24 HLU 431 List 1D Performance Data Screen Span 1 1 or 2 Doublers Figure 25 HLU 431 List 1D Performance Data Screen Span 2 1 Doubler...

Page 62: ...Section 150 431 114 Release 01 Page 62 Figure 26 HLU 431 List 1D Performance Data Screen Span 2 2 Doublers Figure 27 HLU 431 List 1D Performance Data Screen Span 3 2 Doublers...

Page 63: ...Section 150 431 114 Release 01 Page 63 Figure 28 HLU 431 List 1D 7 Day Performance History Screen Span 1 1 or 2 Doublers Figure 29 HLU 431 List 1D 7 Day Performance History Screen Span 2 1 Doubler...

Page 64: ...Section 150 431 114 Release 01 Page 64 Figure 30 HLU 431 List 1D 7 Day Performance History Screen Span 2 2 Doublers Figure 31 HLU 431 List 1D 7 Day Performance History Screen Span 3 2 Doublers...

Page 65: ...Section 150 431 114 Release 01 Page 65 Figure 32 HLU 431 List 1D Alarm History Screen Span 1 1 or 2 Doublers Figure 33 HLU 431 List 1D Alarm History Screen Span 2 1 or 2 Doublers...

Page 66: ...ase 01 Page 66 Figure 34 HLU 431 List 1D Alarm History Screen Span 3 2 Doublers Copyright 1997 PairGain Technologies Inc PairGain is a registered trademark CopperOptics and HiGain are trademarks of Pa...

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