Page 1: Table Of Contents
12. TESTING CAUTION This product incorporates static sensitive components. Proper electrostatic discharge procedures must be followed. Figure 1. HRU-612 List 2 Front Panel. The PairGain HRU-612 is the remote side of a single pair repeaterless T1 transmission system. Page 1...
Page 2: Product Overview
• RS-232 front panel terminal access for 1. DESCRIPTION AND FEATURES craft 1.01 PairGain’s HiGain-2 Remote Unit Model • CPE current monitor test points HRU-612, List 2, Figure 1, is the remote end • Front panel VHDSL margin threshold of a single pair repeaterless T1 transmission system.
Page 3: Specifications
Section 150-612-102 Revision 03 TABLE 1. HIGAIN-2 VHDSL LOOP LIMITS Cable Gauge Loss @ 392 Ohms per kft Maximum Loop For Ohms @ Maximum kHz dB/kft 35 dB Loss Loop Length 26/0.4 mm 4.97 83.3 7.0 kft / 2.13 km 24/051 mm 3.87 51.9...
Page 4: Warranty
PairGain representative will void the B. FUNCTIONAL DESCRIPTION warranty. 7. FUNCTIONAL OPERATION 5.03 If a unit needs repair, call PairGain for a Return Material Authorization (RMA) 7.01 HiGain-2 utilizes PairGain’s 2B1Q VHDSL number and return the defective unit, freight prepaid,...
Page 5 Section 150-612-102 Revision 03 7.03 The HRU-612 typically dissipates 6 watts of invokes autobaud from 1200 to 9600 baud. Note power and may consume up to 8 watts that if the RS-232 port in an HRE-421 is used to when feeding 60 mA. of simplex current to the CI. access the HRU-612, a null modem must be used since the HRE-421 is configured as DTE .
Page 6: Front Panel
Section 150-612-102 Revision 03 8. FRONT PANEL BUTTON - Depressing this front panel button for 5 seconds forces the HRU 8.01 DS1. The top 60% of the front panel into its NREM metallic loopback state. addresses the following DS1 interface The unit can be unlooped by either features: depressing the button again for 5...
Page 7: Options
Section 150-612-102 Revision 03 • TLOS-LB YELLOW LED indicating that framing pattern of DIS* : A loss of the T1 XMT signal from the CPE the signal being received at the HRU’s DS1 causes the HLU to transmit the AIS signal input is SF.
Page 8 Section 150-612-102 Revision 03 RLEV 15 : Configures the T1 RCV LEVEL to -15 dB. This sets the T1 output signal level from the 0 *: Configures the T1 RCV LEVEL to 0 dB. HRU towards the NI level to -15 dB. This This sets the T1 output signal level from the setting is recommended when the HRU HRU towards the NI to 0 dB.
Page 9: Loopbacks
Section 150-612-102 Revision 03 10. LOOPBACKS 10.04 When the HRU is in its AIS/ENA smart-jack metallic loop back state, its T1 input LOS, 10.01 Figure 5 shows all four HRU loopbacks. Of Code & Frame monitoring circuits are connected to these four, the TLOS and CLOC are logic the unframed AIS pattern which is being looped loopbacks.
Page 10: Installation And Test
10.08 The TLOS initiated loopback is a logic loopback that is equivalent to the PRE- PairGain’s HRE-421 (double width, single LOOP PASSED AIS/ENA loopback option. The mount), HRE-422 (double width, double mount), HRE-427 (double width, 7 unit wall mount), or HRE-...
Page 11 Section 150-612-102 Revision 03 TABLE 2. HRU-612 Test Procedures. Step Action Depress the loopback LB button on the HRU front panel for at least 5 seconds. Verify that the GREEN HRU front panel loopback LB NET LED turns on, indicating that the HRU is in its (NREM) loopback state.
Page 12 Section 150-612-102 Revision 03 12. TESTING 12.02 The HLU’s 4 character front panel has many useful diagnostic messages. They are listed 12.01 Table 2 provides a step by step test in Table 3. procedure for the HRU-612 unit. This procedure allows verification of the integrity of the 12.03 If trouble is encountered at the T1 interface, VHDSL channel to the HLU Line Hit as well as the...
Page 13 Section 150-612-102 Revision 03 TABLE 3. HLU 4 CHARACTER FRONT PANEL MESSAGES (CONTINUED) Message Full Name Description M =xx VHDSL Loop Margin Indicates the power of the received VHDSL signal relative to noise. Any value of ‘06’ or greater is adequate for reliable system operation.
Page 14 Section 150-612-102 Revision 03 TABLE 4. HRU-612 STATUS MENU DEFINITIONS Message Full Name Description ALARMS NONE No Alarms LLOS Local Loss of Signal No signal from local T1 interface RLOS Remote Loss of Signal No signal from remote T1 interface Minor Alrm A Minor Alarm condition is in effect.
Page 15 Section 150-612-102 Revision 03 TABLE 5. GLOSSARY OF HIGAIN TERMS Term Definition MARGINS Indicates the excess signal to noise ratio, at either the HLU or HRU, relative to a 10-7 Bit Error Rate. 1st value is current margin, 2nd value is minimum margin since (C)leared last, 3rd value is maximum value since cleared.
Page 16 Section 150-612-102 Revision 03 Figure 7. HRU-612 Maintenance Terminal Main Menu. Figure 8. HRU-612 View Span Status Display. Page 16...
Page 17 Section 150-612-102 Revision 03 Figure 9. HRU-612 System Settings Menu. Figure 10. HRU-612 Set Clock Menu. Page 17...
Page 18 Section 150-612-102 Revision 03 Figure 11. HRU-612 View Performance Data Display. Figure 12. HRU-612 View Performance History Display. Page 18...
Page 19 Section 150-612-102 Revision 03 Figure 13. HRU-612 View Alarm History Display. Copyright © 1996, PairGain Technologies, Inc. PairGain is a registered trademark, CopperOptics and HiGain are trademarks of PairGain Technologies, Inc. Page 19...

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