Page 1: Table Of Contents
10. INSTALLATION 11. TESTING CAUTION This product incorporates static sensitive components. Proper electrostatic discharge procedures must be followed. Figure 1. HLU-611 Front Panel. The PairGain HLU-611 is the Central Office side of a single pair repeaterless T1 transmission system. Page 1...
Page 2: Product Overview
1. DESCRIPTION AND FEATURES • Margin threshold alarm. 1.01 PairGain’s HiGain-2 Line Unit Model HLU- • Smart-jack AIS option. 611 Issue 1, List 3 Figure 1, is the Central Office side of a single pair repeaterless T1 • Easy return to factory default user transmission system.
Page 3: Specifications
Section 150-611-103 Revision 01 3. SPECIFICATIONS DS1 Line Format AMI, B8ZS or ZBTSI. VHDSL Line Code 1568 kb/s 2B1Q. DS1 Frame Format ESF, SF or unframed. VHDSL Output +13.5 dBm +/- 0.5 dB @ 135 ohms . Power Consumption 14 watts typ.; 18 watts max. VHDSL Line Impedance 135 ohms.
Page 4: Certification
1568 kb/s data channels between the HLU- 5.03 If a unit needs repair, call PairGain for a 611 and a remotely mounted HRU-612 HiGain-2 Return Material Authorization (RMA) Remote Unit. number and return the defective unit, freight prepaid, 7.02...
Page 5 Section 150-611-103 Revision 01 7.03 The HLU-611 contains a demultiplexer that 7.08 A DSX-1 interface driver converts the DS1 generates a 1568 kb/s data stream. The channel to an AMI or B8ZS format. The data stream contains VHDSL frames that are DSX-1 equalizer is programmable to 5 different lengths as determined by the distance between the nominally 9408 bits (6 milliseconds) in length.
Page 6 Section 150-611-103 Revision 01 7.12 In Central Office locations, the maximum The Maximum Current Drain is the 7.15 power dissipation for open faced, natural maximum current drawn from the shelf power convection cooled mountings is limited to 120 W / supply when it is at its minimum voltage (42.5 V).
Page 7: Options
Section 150-611-103 Revision 01 system option. See Section 8 for System Settings loopback session terminates and the normal margin information. The MAL1 alarm can be disabled by displays reappear. If this time-out occurs with an setting the margin alarm threshold to 0. All six active loopback in effect, the appropriate loopback message appears in addition to the loop margin alarms can be inhibited by selecting DIS (disable) for...
Page 8: Loopbacks
Section 150-611-103 Revision 01 is depressed, a YES message is displayed and the After all the new settings have been made, enter “E” chosen changes are installed. In either case the for exit and then “C” for confirm. The new choices are now installed.
Page 9 Section 150-611-103 Revision 01 9.03 GNLB is the HiGain-2 Generic loopback DS1 interface. All looped states are terminated code. The GNLB allows 4 in 7 or 6 in 7 in- (looped-down) with the 3 in 5 loop-down code. All band codes to loop-up the HLU (NLOC or CREM commands must be present for 5 seconds before HiGain-2 responds.
Page 10 Section 150-611-103 Revision 01 TABLE 2. SYSTEM OPTION SETTINGS MODE CHOICE DESCRIPTION “EQL” EXT* Replaces the internal equalizer with a 12 Vpk-pk drive source for an external equalizer. Sets the Equalizer to DSX-1 for 0-133 feet. Sets the Equalizer to DSX-1 for 133-266 feet. Sets the Equalizer to DSX-1 for 266-399 feet.
Page 11 Section 150-611-103 Revision 01 TABLE 2. SYSTEM OPTION SETTINGS (CONTINUED) MODE CHOICE DESCRIPTION “LNCD” B8ZS Places both the HLU-611 & HRU-612 into their B8ZS modes. AMI* Places both the HLU-611 & HRU-612 into their AMI modes. “FRMG” AUTO* Configures the HiGain system to operate in an auto-framing (AUTO) mode in which it continuously searches the input T1 bit stream for a valid SF or ESF frame pattern.
Page 12: Installation And Test
A3LB supports the additional 1 in 6 smart jack This is required to resolve a conflict between the HLU alarm relay output and loopback command. Refer to the PairGain HiGain-2 the Kentrox external equalizer output. Both Intelligent Repeater Application Note # 910 Part # use the same pins, 20 and 21.
Page 13: Testing
Section 150-611-103 Revision 01 11. TESTING 11.01 Tables 3 through 8 provide step by step test procedures for the HLU-611 Unit as a function of the loopback option selected. These procedures allow verification of the integrity of the FUSEALARM * VHDSL channel to the HRU-612 remote unit as well as the DS1 channels to the customer and the local VHDSLT I P1...
Page 14 Section 150-611-103 Revision 01 TABLE 3. HLU-611 TEST PROCEDURES FOR GNLB OPTION Step Action Have the C.O. tester send the HRU (3 in 7) in-band loop-up for 5 seconds. Observe that the HLU displays the “NREM” message indicating an HRU loopback is in effect (see Figure 5). Have the C.O.
Page 15 Section 150-611-103 Revision 01 TABLE 4. HLU-611 TEST PROCEDURES FOR A1LB OPTION Step Action Send into the HLU the inband ARMING and NIU (Network Interface Hit) LPBK code 11000 for at least 5 seconds, or at least 4 repetitions of the 16-bit ESF Data Link ARMING code 0001 0010 1111 1111. Monitor the output of the HLU-611 for the return of the pattern.
Page 16 Section 150-611-103 Revision 01 TABLE 4. HLU-611 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) shown in Figure 5. A CUSTOMER tester can activate loopbacks CLOC or CREM. Addressable 1 (A1LB) Repeater Loopback Commands ARMING or NIU LPBK (inband) Arming code...
Page 17 Section 150-611-103 Revision 01 TABLE 5. HLU-611 TEST PROCEDURES FOR A2LB OPTION Step Action Send into the HLU the inband ARMING and NIU (Network Interface Hit) LPBK code 11000 for at least 5 seconds, or at least 4 repetitions of the 16-bit ESF Data Link ARMING code 0001 0010 1111 1111. Monitor the output of the HLU-611 for the return of the pattern.
Page 18 Section 150-611-103 Revision 01 TABLE 5. HLU-611 TEST PROCEDURES FOR A2LB OPTION (CONTINUED) Step Action Using the following codes, a NETWORK tester can activate loopbacks NLOC or NREM or SMJK (if enabled) shown in Figure 5. A CUSTOMER tester can activate loopbacks CLOC or CREM. Addressable 2 (A2LB) Repeater Loopback Commands ARMING or NIU LPBK (inband) Arming code...
Page 19 Section 150-611-103 Revision 01 TABLE 6. HLU-611 TEST PROCEDURES FOR A3LB OPTION Step Action The HiGain-2 Line Hit can be looped back (NLOC in Figure 5) by sending the (Addressable Office Repeater) LPBK activation code 1111(F) 1111(F) 0001(1) 1110(E) for at least 5 seconds. This causes the HLU to enter its NLOC state shown in Figure 5.
Page 20 Section 150-611-103 Revision 01 TABLE 7. HLU-611 TEST PROCEDURES FOR A4LB OPTION Step Action The HiGain-2 Line Hit can be looped back (NLOC in Figure 5) by sending the (Addressable Office Repeater) LPBK activation code 1111(F) 1111(F) 0001(1) 1110(E) for at least 5 seconds. This causes the HLU to enter its NLOC state shown in Figure 5.
Page 21 Section 150-611-103 Revision 01 TABLE 8. HLU-611 TEST PROCEDURES FOR A5LB OPTION Step Action Send into the HLU the inband ARMING and NIU (Network Interface Hit) LPBK code 11000 for at least 5 seconds, or at least 4 repetitions of the 16-bit ESF Data Link ARMING code 0001 0010 11111111. Monitor the output of the HLU-611 for the return of the pattern.
Page 22 Section 150-611-103 Revision 01 TABLE 8. HLU-611 TEST PROCEDURES FOR A5LB OPTION (CONTINUED) Step Action Using the following codes, a NETWORK tester can activate loopbacks NLOC or NREM or SMJK (if enabled) shown in Figure 5. A CUSTOMER tester can activate loopbacks CLOC or CREM. Addressable 5 (A5LB) Repeater Loopback Commands ARMING or NIU LPBK (inband) Arming code...
Page 23 Section 150-611-103 Revision 01 TABLE 9. HLU 4 CHARACTER FRONT PANEL MESSAGES Message Full Name Description CREM Customer Remote Loopback Signal from customer is looped back to customer at HLU-611 NLOC Network Local Loopback DSX signal is looped back to DSX at HLU CLOC Customer Local Loopback Signal from Customer is looped back to customer at HRU-612...
Page 24 Section 150-611-103 Revision 01 TABLE 9. HLU 4 CHARACTER FRONT PANEL MESSAGES (CONTINUED) Message Full Name Description PWR FEED Power Feed Short Indicates a short across the VHDSL pair SHRT PWR FEED Power Feed Open Indicates an open circuit in the T&R of the VHDSL pair. OPEN PWR FEED Power Feed Off...
Page 25 Section 150-611-103 Revision 01 Figure 6. HLU-611 Maintenance Menu Main Menu. Figure 7. HLU-611 View Span Status Display. Page 25...
Page 26 Section 150-611-103 Revision 01 Figure 8. HLU-611 System Settings Menu. Figure 9. HLU-611 Set Clock Menu. Page 26...
Page 27 Section 150-611-103 Revision 01 Figure 10. HLU-611 View Performance Data Display. Figure 11. HLU-611 View Performance History Display. Page 27...
Page 28 Section 150-611-103 Revision 01 Figure 12. HLU-611 View Alarm History Display Figure 13. HLU-611 Loopback Menu Copyright © 1995, PairGain Technologies, Inc. PairGain is a registered trademark, CopperOptics and HiGain are trademarks of PairGain Technologies, Inc. Page 28...

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