Page 1: Table Of Contents
PAIRGAIN TECHNOLOGIES Section 150-388-124 Technical Practice Revision 01 Engineering - PLANT Series June 21, 1996 MODEL HLU-388 List # Part Number CLEI Code 150-1141-24 T1L2BBBAAA CONTENTS PAGE A. PRODUCT OVERVIEW 1. DESCRIPTION AND FEATURES 2. HIGAIN SYSTEM APPLICATIONS 3. FUNCTIONAL OPERATION 4.
Page 2: Product Overview
Section 150-388-124 Revision 01 • Non-volatile front panel operator setup A. PRODUCT OVERVIEW • Lightning and power cross protection on HDSL 1. DESCRIPTION AND FEATURES interfaces • 784 kbps full duplex 2B1Q HDSL transmission 1.01 PairGain’s HiGain Line Unit Model HLU-388, List 2D (see Figure 1) is the Central Office side of on two pairs a repeaterless T1 transmission system.
Page 3: Functional Operation
Section 150-388-124 Revision 01 3. FUNCTIONAL OPERATION 3.03 The HLU-388, List 2D contains a multiplexer that generates two parallel 784 kbps data streams. The 3.01 The HiGain system utilizes PairGain 2-Bit data streams contain HDSL frames that are nominally 4704 1-Quartenary (2B1Q) HDSL transceiver systems to bits (6 milliseconds) in length.
Page 4: Alarms
Section 150-388-124 Revision 01 3.04 3.09 The received HDSL channels are processed A 3-pin miniature 210 Bantam type connector jack by the transceiver and then passed on to the HLU- (Figure 3), is provided on the front panel of the 388, List 2D demultiplexer module.
Page 5 Section 150-388-124 Revision 01 HRU DS1 inputs, have exceeded the 24-hour user-selected threshold. 8. ALRM MAL1: The margin on HDSL loop 1 has dropped below the minimum threshold value set by the RS-232 terminal Margin Alarm Threshold; as described in Section 5. 9.
Page 6: System Options
Section 150-388-124 Revision 01 5. SYSTEM OPTIONS 5.04 Pressing the Mode button for three or more seconds causes the display to scroll through the 5.01 The HLU-388, List 2D contains a non-volatile HLU-388, List 2D software version number, its list number, RAM (NVRAM) which stores the system options the type of frame pattern being received from the DSX-1, settings.
Page 7 Section 150-388-124 Revision 01 5.07 5.11 The Circuit ID option is set by choosing the The new T1 transceiver chip in the List 2D allows H option from the terminal Main Menu screen (see the unit to process both B8ZS and AMI code Figure 7 for non-doubler applications and Figure 16 for inputs, regardless of the DS1 code setting (AMI or B8ZS).
Page 8 Section 150-388-124 Revision 01 TABLE 1. HLU-388, LIST 2D SYSTEM OPTIONS Mode Selection Description Sets the equalizer to DSX-1 for 0 to 132 feet. Sets the equalizer to DSX-1 for 133 to 265 feet. Sets the equalizer to DSX-1 for 266 to 398 feet. Sets the equalizer to DSX-1 for 399 to 532 feet.
Page 9 Section 150-388-124 Revision 01 TABLE 1. HLU-388, LIST 2D SYSTEM OPTIONS (CONTINUED) Mode Selection Description AUTO The HLU-388, List 2D and HRU-412 independently monitor their incoming T1 bit streams for the Binary Eight Zero Substitution (B8ZS) pattern. If either unit detects this pattern, it enters its B8ZS mode.
Page 10: Hdsl Line Voltage Option
Section 150-388-124 Revision 01 6. HDSL LINE VOLTAGE OPTION 7. INSTALLATION 6.01 The symmetry of the HDSL line powering voltage 7.01 Upon receipt of the equipment, visually inspect it can be set by the S2 switch, located on the printed for signs of damage.
Page 11: Specifications
Section 150-388-124 Revision 01 8. SPECIFICATIONS Dimensions Height: 3.5 in. (8.9 cm) HDSL Line Code Width: 0.72 in. (1.8 cm) 784 kbps 2B1Q Depth: 10.25 in. (26 cm) HDSL Output +13.5 dBm ± 0.5 dB at 135 ohms Weight: TBD HDSL Line Impedance 9.
Page 12: Warranty
Section 150-388-124 Revision 01 10. WARRANTY 11. TECHNICAL ASSISTANCE 10.01 PairGain Technologies warrants this product to be 11.01 PairGain Technical Assistance is available 24 free of defects and fully functional for a period of hours a day, 7 days a week by contacting 36 months from the date of original shipment, given proper PairGain’s Customer Service Engineering group at one of installation.
Page 13: Applications Without Higain
Section 150-388-124 Revision 01 B. APPLICATIONS WITHOUT HIGAIN 13.03 In Central Office locations, the maximum power DOUBLERS (HDU-451) dissipation for open-faced, natural convection cooled mountings is limited to 120 Watts/sq. ft. per Section 12. SECTION INTRODUCTION 4.2.3 of the NEBS standard TR-NWT-000063. footprint of a standard 28-slot 23-inch HLU-388, List 2D 12.01 This section addresses HLU-388,...
Page 14: Loopback Operation
Section 150-388-124 Revision 01 • A2LB (Teltrend) = Southwestern Bell 14. LOOPBACK OPERATION • A3LB (Wescom) = New England Telephone 14.01 The HiGain system has a family of loopback • A4LB (Wescom Mod 1) = New York options. The most important of these is the “Smart- Jack”...
Page 15: Testing
Section 150-388-124 Revision 01 14.08 15. TESTING Pressing both the Mode and SEL front panel push buttons, for at least three seconds, initiates a 15.01 Table 2 through Table 7 provide step-by-step test Manual Loopback session. This session allows the user to procedures for the HLU-388, List 2D as a function select one of four HiGain system loopbacks.
Page 16 Section 150-388-124 Revision 01 Figure 6. HLU-388, List 2D Non-Doubler Loopback Configurations. The most important of the HiGain family of loopback options is the Smart-Jack loopback, which emulates the functions of a standard NID. Page 16...
Page 17 Section 150-388-124 Revision 01 TABLE 2. HLU-388 GNLB TEST PROCEDURES Step Action Have the CO tester send the HRU-412 (3 in 7) in-band loop-up code for five seconds. Observe that the HLU- 388, List 2D displays the “NREM” message indicating an HRU loopback is in effect (see Figure 6). Have the CO tester transmit a DSX-1 test signal into the HLU-388, List 2D and verify that the returned (looped) signal is error free.
Page 18 Section 150-388-124 Revision 01 TABLE 3. HLU-388 A1LB TEST PROCEDURES Step Action Send the in-band Arming and NI LPBK code 11000 into the HLU-388, List 2D, for at least five seconds or at least four repetitions of the 16-bit ESF data link Arming code 1111 1111 0100 1000 (FF48).
Page 19 Section 150-388-124 Revision 01 TABLE 3. TEST PROCEDURES FOR A1LB OPTION (CONTINUED) Step Action Using the following codes, a network tester can activate loopbacks NLOC or NREM or SMJK (if ENAbled, see Figure 6). A customer tester can activate loopbacks CLOC or CREM. ADDRESSABLE 1 (A1LB) REPEATER LOOPBACK COMMANDS ARMING or NI LPBK (in-band) Arming code...
Page 20 Section 150-388-124 Revision 01 TABLE 4. HLU-388 A2LB TEST PROCEDURES Step Action Send the in-band Arming and NI LPBK code 11000 into the HLU-388, List 2D, for at least five seconds or at least four repetitions of the 16-bit ESF data link Arming code 1111 1111 0100 1000 (FF48).
Page 21 Section 150-388-124 Revision 01 TABLE 4. HLU-388 A2LB TEST PROCEDURES (CONTINUED) Step Action Using the following codes, a network tester can activate loopbacks NLOC or NREM or SMJK (if ENAbled, see Figure 6). A customer tester can activate loopbacks CLOC or CREM. ADDRESSABLE 2 (A2LB) REPEATER LOOPBACK COMMANDS ARMING or NI LPBK (in-band) Arming code...
Page 22 Section 150-388-124 Revision 01 TABLE 5. HLU-388 A3LB TEST PROCEDURES Step Action The HiGain Line Unit can be looped back (NLOC in Figure 6) by sending the Addressable Office Repeater (AOR) LPBK activation code 1111 1111 0001 1110 (FF1E) for at least five seconds. This causes the HLU-388, List 2D to enter its NLOC state (see Figure 6).
Page 23 Section 150-388-124 Revision 01 TABLE 6. HLU-388 A4LB TEST PROCEDURES Step Action The HiGain Line Unit can be looped back (NLOC in Figure 6) by sending the Addressable Office Repeater (AOR) LPBK activation code 1111 1111 0001 1110 (FF1E) for at least five seconds. This causes the HLU-388, List 2D to enter its NLOC state (see Figure 6).
Page 24 Section 150-388-124 Revision 01 TABLE 7. HLU-388 A5LB TEST PROCEDURES Step Action Send the in-band Arming and NI (Network Interface) LPBK code 11000 into the HLU-388, List 2D, for at least five seconds or at least four repetitions of the 16-bit ESF data link Arming code 1111 1111 0100 1000 (FF48).
Page 25 Section 150-388-124 Revision 01 TABLE 7. HLU-388 A5LB TEST PROCEDURES (CONTINUED) Step Action Using the following codes, a network tester can activate loopbacks NLOC or NREM or SMJK (if ENAbled, see Figure 6). A customer tester can activate loopbacks CLOC or CREM. ADDRESSABLE 5 (A5LB) REPEATER LOOPBACKS ARMING or NI LPBK (in-band) Arming code...
Page 26 Section 150-388-124 Revision 01 TABLE 8. HLU-388, LIST 2D STATUS MENU MESSAGES Message Full Name Description ALARMS: NONE No Alarms “None” indicates no alarms. LLOS Local Loss of Signal No signal from HLU-388, List 2D local DSX-1 interface. RLOS Remote Loss of Signal No signal from HRU-412 remote DS1 interface.
Page 27 Section 150-388-124 Revision 01 TABLE 8. HLU-388, LIST 2D STATUS MENU MESSAGES (CONTINUED) Message Full Name Description LOOPBACKS : SMJK Smart-Jack Loopback The loopback at HRU-412 (remote) toward network (see Figure 6) initiated by either the (2 in 5) in-band loopback code or the out-of-band ESF data link loopback code.
Page 28: System Maintenance Menu Screens
Section 150-388-124 Revision 01 16. SYSTEM MAINTENANCE MENU SCREENS 16.06 Figure shows 7-Day Performance History screen. The “Errored Seconds” and 16.01 Figure 7 is the Maintenance Terminal Main Menu “Unavailable Seconds” for both HDSL loops and each of screen. Its eight sub-menus provide many useful the two DS1 inputs are listed for the current and previous provisioning, test and monitoring tools.
Page 29 Section 150-388-124 Revision 01 TABLE 9. GLOSSARY OF HIGAIN TERMS Term Definition Margins Indicates the excess signal-to-noise ratio, at either the HRU-412 or HLU 388, List 2D HDSL ports, relative to a 10 Bit Error Rate. First value is current margin. Second value is minimum margin since (C)leared last.
Page 30 Section 150-388-124 Revision 01 TABLE 10. HLU-388, LIST 2D FOUR-CHARACTER FRONT PANEL MESSAGES Message Full Name Description CREM Customer Remote Loopback Signal from customer is looped back to customer at HLU-388. NLOC Network Local Loopback DSX-1 signal is looped back to DSX-1 at HLU. CLOC Customer Local Loopback Signal from customer is looped back to customer at HRU-412.
Page 31 Section 150-388-124 Revision 01 TABLE 10. HLU-388, LIST 2D FOUR-CHARACTER FRONT PANEL MESSAGES (CONTINUED) Message Full Name Description PWR FEED Power Feed Short Indicates a short between the two HDSL pairs. This same SHRT message can occur with an HRU which is drawing the correct amount of power over good cable pairs, but can not communicate with the HLU.
Page 32 Section 150-388-124 Revision 01 Figure 7. HLU-388, List 2D Main Menu. Figure 8. HLU-388, List 2D Non-Doubler Status Display. Page 32...
Page 33 Section 150-388-124 Revision 01 Figure 9. HLU-388, List 2D Set Clock Menu. Figure 10. HLU-388, List 2D System Settings Menu. Page 33...
Page 34 Section 150-388-124 Revision 01 Figure 11. HLU-388, List 2D Non-Doubler Loopback Menu Figure 12. HLU-388, List 2D Non-Doubler Performance Data Screen. Page 34...
Page 35 Section 150-388-124 Revision 01 Figure 13. HLU-388, List 2D Non-Doubler 7-Day Performance History Screen. Figure 14. HLU-388, List 2D Non-Doubler Alarm History Screen. Page 35...
Page 36: Applications Using Higain Doublers
Section 150-388-124 Revision 01 APPLICATIONS USING HIGAIN DOUBLERS 4. The HRU-412 CPE current option must be set to 0 (HDU-451) mA. Its 60 mA CPE current switch must be set to 0 mA, or, its card edge pins must be strapped for 0 17.
Page 37: Loopback Operation
Section 150-388-124 Revision 01 TABLE 11. HLU-388, LIST 2D DOUBLER POWER PARAMETERS 60 mA CPE CO Voltage CO Current Power Consumption HLU Power Doubler Models Current Volts Amps Watts Dissipation Watts HDU-439/437 42.50 0.50 21.5 also HDU-451 List 1, 2, 3, 4 48.00 0.44 21.5...
Page 38 Section 150-388-124 Revision 01 19.04 19.07 The A1LB loopback selection complies with that Two additional loopback points are added for each proposed for HDSL systems in the T1/E-1.4/92 doubler that is used, as shown in Figure 15. NDU1 recommendation with following additions and NDU2 are executed toward the network.
Page 39: Testing
Section 150-388-124 Revision 01 19.10 20. TESTING Depressing both the Mode and SEL push buttons on the front panel for at least three seconds 20.01 Table 12 through Table 17 provide step-by-step initiates a Manual Loopback session. This session allows test procedures for the HLU-388, List 2D as a the user to select one of eight HiGain system loopbacks.
Page 40 Section 150-388-124 Revision 01 Figure 15. HLU-388 Doubler Loopback Configurations. The most important of the HiGain family of loopback options is the Smart- Jack loopback, which emulates the functions of a standard NID. Page 40...
Page 41 Section 150-388-124 Revision 01 TABLE 12. HLU-388 GNLB TEST PROCEDURES Step Action Have the CO tester send the HRU-412 (3 in 7) in-band loop-up code for five seconds. Observe that the HLU-388, List 2D displays the “NREM” message indicating an HRU-412 loopback is in effect (see Figure 15). Have the CO tester transmit a DSX-1 test signal into the HLU-388, List 2D and verify that the returned (looped) signal is error free.
Page 42 Section 150-388-124 Revision 01 TABLE 13. HLU-388 A1LB TEST PROCEDURES Step Action Send the in-band Arming and NI LPBK code 11000 into the HLU-388, List 2D, for at least five seconds or at least four repetitions of the 16-bit ESF data link Arming code 1111 1111 0100 1000 (FF48). (Left bit arrives first.) Monitor the output of the HLU-388, List 2D for the return of the pattern.
Page 43 Section 150-388-124 Revision 01 TABLE 13. HLU-388 A1LB TEST PROCEDURES (CONTINUED) Step Action Using the following codes, a network tester can activate loopbacks NLOC or NREM or SMJK (if ENAbled, see Figure 15). A customer tester can activate loopbacks CLOC or CREM. ADDRESSABLE 1 (A1LB) REPEATER LOOPBACK COMMANDS ARMING or NI LPBK (in-band) Arming code...
Page 44 Section 150-388-124 Revision 01 TABLE 14. HLU-388 A2LB TEST PROCEDURES Step Action Send the in-band Arming and NI LPBK code 11000 into the HLU-388, List 2D, for at least five seconds or at least four repetitions of the 16-bit ESF data link Arming code 1111 1111 0100 1000 (FF48). (Left bit arrives first.) Monitor the output of the HLU-388, List 2D for the return of the pattern.
Page 45 Section 150-388-124 Revision 01 TABLE 14. HLU-388 A2LB TEST PROCEDURES (CONTINUED) Step Action Using the following codes, a network tester can activate loopbacks NLOC or NREM or SMJK (if ENAbled, see Figure 15). A customer tester can activate loopbacks CLOC or CREM. ADDRESSABLE 2 (A2LB) REPEATER LOOPBACK COMMANDS ARMING or NI LPBK (in-band) Arming code...
Page 46 Section 150-388-124 Revision 01 TABLE 15. HLU-388 A3LB TEST PROCEDURES Step Action The HLU-388, List 2D can be looped back (NLOC in Figure 15) by sending the Addressable Office Repeater (AOR) LPBK activation code 1111 1111 0001 1110 (FF1E) for at least five seconds. This causes the HLU-388, List 2D to enter its NLOC state (see Figure 15).
Page 47 Section 150-388-124 Revision 01 TABLE 16. HLU-388 A4LB TEST PROCEDURES Step Action The HLU-388, List 2D can be looped back (NLOC in Figure 15) by sending the Addressable Office Repeater (AOR) LPBK activation code 1111 1111 0001 1110 (FF1E)for at least five seconds. This causes the HLU-388, List 2D to enter its NLOC state (see Figure 15).
Page 48 Section 150-388-124 Revision 01 TABLE 17. HLU-388 A5LB TEST PROCEDURES Step Action Send the in-band Arming and NI LPBK code 11000 into the HLU-388, List 2D, for at least five seconds or at least four repetitions of the 16-bit ESF data link Arming code 1111 1111 0100 1000 (FF48). (Left bit arrives first.) Monitor the output of the HLU-388, List 2D for the return of the pattern.
Page 49 Section 150-388-124 Revision 01 TABLE 17. HLU-388 A5LB TEST PROCEDURES (CONTINUED) Step Action Using the following codes, a network tester can activate loopbacks NLOC or NREM or SMJK (if ENAbled) (see Figure 15). A customer tester can activate loopbacks CLOC or CREM. ADDRESSABLE 5 (A5LB) REPEATER LOOPBACK COMMANDS ARMING or NI LPBK (in-band) Arming code...
Page 50: System Maintenance Menu Screens
Section 150-388-124 Revision 01 21. SYSTEM MAINTENANCE MENU SCREENS 21.07 Figure through Figure show Performance Data screens for doubler applications. 21.01 Figure 16 is the Maintenance Terminal Main The “Errored Seconds” and “Unavailable Seconds” for both Menu screen. Its eight sub-menus provide many HDSL loops and each T1 input are listed at 15-minute useful provisioning, test and monitoring tools.
Page 51 Section 150-388-124 Revision 01 21.09 “Count” column lists the number of times each alarm Figure 32 through Figure 34 show the Alarm History screens for doubler applications. occurred. All the data can be cleared by pressing C (Clear). alarms are defined in Section A Paragraph 4.01. The LOS The maximum non-overflowing count is 999.
Page 52 Section 150-388-124 Revision 01 TABLE 18. HLU-388, LIST 2D STATUS MENU MESSAGES (CONTINUED) Message Full Name Description LOOPBACKS: SMJK Smart-Jack Loopback The loopback at HRU-412 (remote) toward network (see Figure 15) initiated by either the (2 in 5) in-band loopback code or the out-of-band ESF data link loopback code.
Page 53 Section 150-388-124 Revision 01 TABLE 19. GLOSSARY OF HIGAIN TERMS Term Definition Margins Indicates the excess signal-to-noise ratio, at the HRU-412, HDU-451, or HLU-388, List 2D HDSL ports, relative to a 10 BER. First value is current margin. Second value is minimum margin since (C)leared last.
Page 54 Section 150-388-124 Revision 01 TABLE 20. HLU-388, LIST 2D FOUR-CHARACTER FRONT PANEL MESSAGES Message Full Name Description CREM Customer Remote Loopback Signal from customer is looped back to customer at HLU-388. NLOC Network Local Loopback DSX-1 signal is looped back to DSX-1 at HLU. CLOC Customer Local Loopback Signal from customer is looped back to customer at HRU-412.
Page 55 Section 150-388-124 Revision 01 TABLE 20. HLU-388, LIST 2D FOUR-CHARACTER FRONT PANEL MESSAGES (CONTINUED) Message Full Name Description A2L1 Acquisition 2 Loop 1 The first doubler is trying to establish synchronization with either the HRU or the second doubler multiplexers on loop 1 of span 2.
Page 56 Section 150-388-124 Revision 01 TABLE 20. HLU-388, LIST 2D FOUR-CHARACTER FRONT PANEL MESSAGES (CONTINUED) Message Full Name Description BAD RT? No response from HRU The HLU does not receive any response from the HRU. Thus, the HRU’s integrity is questionable. VER XXXX HLU software Version number This is displayed during the System Settings review mode.
Page 57 Section 150-388-124 Revision 01 Figure 16. HLU-388, List 2D Main Menu. Figure 17. HLU-388, List 2D Status Display - Span 1 (1 or 2 Doublers). Page 57...
Page 58 Section 150-388-124 Revision 01 Figure 18. HLU-388, List 2D Status Display - Span 2 (1 Doubler). Figure 19. HLU-388, List 2D Status Display - Span 2 (2 Doublers). Page 58...
Page 59 Section 150-388-124 Revision 01 Figure 20. HLU-388, List 2D Status Display - Span 3 (2 Doublers). Figure 21. HLU-388, List 2D Set Clock Menu. Page 59...
Page 60 Section 150-388-124 Revision 01 Figure 22. HLU-388, List 2D System Settings Menu. Figure 23. HLU-388, List 2D Doubler Loopback Menu. Page 60...
Page 61 Section 150-388-124 Revision 01 Figure 24. HLU-388, List 2D Performance Data Screen - Span 1 (1 or 2 Doublers). Figure 25. HLU-388, List 2D Performance Data Screen - Span 2 (1 Doubler). Page 61...
Page 62 Section 150-388-124 Revision 01 Figure 26. HLU-388, List 2D Performance Data Screen - Span 2 (2 Doublers). Figure 27. HLU-388, List 2D Performance Data Screen - Span 3 (2 Doublers Page 62...
Page 63 Section 150-388-124 Revision 01 Figure 28. HLU-388, List 2D 7-Day Performance History Screen - Span 1 (1 or 2 Doublers). Figure 29. HLU-388, List 2D 7-Day Performance History Screen - Span 2 (1 Doubler). Page 63...
Page 64 Section 150-388-124 Revision 01 Figure 30. HLU-388, List 2D 7-Day Performance History Screen - Span 2 (2 Doublers). Figure 31. HLU-388, List 2D 7-Day Performance History Screen - Span 3 (2 Doublers). Page 64...
Page 65 Section 150-388-124 Revision 01 Figure 32. HLU-388, List 2D Alarm History Screen - Span 1 (1 or 2 Doublers). Figure 33. HLU-388, List 2D Alarm History Screen - Span 2 (1 or 2 Doublers). Page 65...
Page 66 Section 150-388-124 Revision 01 Figure 34. HLU-388, List 2D Alarm History Screen - Span 3 (2 Doublers). Copyright © 1996, PairGain Technologies, Inc. PairGain is a registered trademark, CopperOptics and HiGain are trademarks of PairGain Technologies, Inc. Page 66...

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