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150-412-181-01

March 31, 1998

Revision 01

HRU-412 List 8A

PairGain Engineering - Plant Series

29

L

OOPBACKS

The HRU-412 List 8A supports 6 types of loopbacks (see

).

•

TLOS (transmit loss of signal)

•

CREM (customer remote loopback)

•

NREM (network remote loopback)

•

NLOC (network local loopback)

•

CLOC (customer local loopback)

•

SMJK (Smart-Jack)

Loopback tests initiate at the CO, using in-band commands.

Figure 15.

HRU-412 List 8A Loopbacks

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Summary of Contents for 150-1103-81

Page 1: ...CHNOLOGIES INC ENGINEERING SERVICES TECHNICAL PRACTICE SECTION 150 412 181 01 Revision History of This Practice Revision 01 March 31 1998 A Initial Release Model List Number Part Number CLEI Code HRU...

Page 2: ...Technologies Inc Information contained in this document is company private to PairGain Technologies Inc and shall not be modified used copied reproduced or disclosed in whole or in part without the w...

Page 3: ...gineering Plant Series iii USING THIS TECHNICAL PRACTICE Two types of messages identified by icons may appear in the text Notes contain information about special circumstances Cautions indicate the po...

Page 4: ...el Features 7 Rear Panel Features 10 Local and Line Powering 12 Installation 14 Unpack and Inspect the Shipment 14 Install the HRU 412 List 8A 14 Installation Test 16 Configure Provision and Monitor P...

Page 5: ...150 412 181 01 March 31 1998 Revision 01 HRU 412 List 8A PairGain Engineering Plant Series v Technical Support 32 Warranty 32 FCC Compliance 33 UL Listing 34 CSA Certification 34...

Page 6: ...20 Figure 7 Main Menu Local Log On 20 Figure 8 Span Status Screen No Doublers in Use 21 Figure 9 Span Status Screen Doublers in Use 22 Figure 10 Set Clock Screen 23 Figure 11 System Settings Menu 24 F...

Page 7: ...1 4 92 002R2 technical standards and recommendations The HRU 412 List 8A mounts in a single slot of an industry standard 400 Mechanics type shelf The system also complies with GR 63 Core of Network Eq...

Page 8: ...ull duplex 2B1Q HDSL transmission on two pairs DS0 blocking support The HRU 412 List 8A supports PairGain s 1 x 1 Protection Switching System The HRU 412 List 8A can be line powered or locally powered...

Page 9: ...ble pairs between the HiGain line unit and the HiGain remote unit Without specific loop insertion loss data add 3 dB for each bridged tap and 1 dB for each cable gauge change The dc cable resistance d...

Page 10: ...B at 196 kHz 135 ohms Line Clock Rate Internal Stratum 4 clock Power Consumption 5 Watts typical 7 Watts maximum Electrical Protection Secondary surge and power cross protection on all DS1 and HDSL po...

Page 11: ...List 8A This provides a total capacity of 1 568 Mbps between the two units PairGain s HDSL technology provides full duplex services at standard T1 rates over copper wires between an HLU and an HRU wh...

Page 12: ...c 1 x 1 protection switch system For this application the HRU 412 List 8A must be installed in the two slot HRE 422 remote enclosure This enclosure provides access to the HRU 412 List 8A protection sw...

Page 13: ...ision 01 HRU 412 List 8A PairGain Engineering Plant Series 7 Front Panel Features Figure 2 shows the front view of the HRU 412 List 8A Table 2 describes the HRU 412 List 8A front panel components Figu...

Page 14: ...ic loopback in the HRU 412 List 8A TLOS Enabled Loopback LB LEDs NET LED lights green to indicate the HRU 412 List 8A is in a loopback state where the signal from the network is looping back to the ne...

Page 15: ...s synchronizing with the HLU The LED lights green to indicate that loop 2 is properly synchronized with the HLU LP2 MAR LED lights yellow when the HRU 412 List 8A margin on HDSL loop 2 has dropped bel...

Page 16: ...1998 150 412 181 01 10 PairGain Engineering Plant Series HRU 412 List 8A Rear Panel Features The HRU 412 List 8A back panel features are shown in Figure 3 Table 3 describes the features Figure 3 HRU 4...

Page 17: ...he CPE and returns the network signal back to the network The HLU displays TLOS in its front panel display This condition remains until a valid T1 signal is received from the CPE or until the 3 in 5 i...

Page 18: ...the two HDSL pairs JP2 shown in Figure 3 allows the sealing current to be enabled or disabled To enable the sealing current connect JP2 across both terminals To disable the sealing current remove the...

Page 19: ...lent is capable of powering two HRU 412 List 8A units with the I CPE option switch set to 0 mA or one HRU 412 List 8A with the I CPE option switch set to 60 mA The HRU 412 List 8A can be used in limit...

Page 20: ...packing list to ensure complete and accurate shipment If you must store the equipment for a prolonged period store it in the original container Install the HRU 412 List 8A The HRU 412 List 8A mounts i...

Page 21: ...150 412 181 01 March 31 1998 Revision 01 HRU 412 List 8A PairGain Engineering Plant Series 15 Figure 4 HRU 412 List 8A Pin Outs...

Page 22: ...dicating that the HRU 412 List 8A is in a digital NREM loopback state If possible verify that the HLU front panel displays NREM 2 Have the CO transmit a T1 test signal to the HLU Measure the return lo...

Page 23: ...the sealing current option JP2 connected Use a milli amp meter to verify transmit or receive current in either HDSL pair CONFIGURE PROVISION AND MONITOR PERFORMANCE The following sections describe ho...

Page 24: ...t 8A Figure 5 HRU 412 List 8A Craft RS 232 Wiring 2 Connect the other end of the terminal cable to the console port on the ASCII terminal 3 Configure the ASCII terminal to the following communication...

Page 25: ...and screens are those from the HRU 412 List 8A internal database When the HRU 412 List 8A is connected to an HLU and doublers are in use the port interface resets to remote when the two units synchor...

Page 26: ...Revision 01 March 31 1998 150 412 181 01 20 PairGain Engineering Plant Series HRU 412 List 8A Figure 6 Remote Log On Screen 2 Press The Main Menu displays Figure 7 Main Menu Local Log On...

Page 27: ...le on the Main Menu by typing the desired letter and then pressing View Span Status From the Main Menu type The Span Status screen displays When no doublers are in use the following Span Status screen...

Page 28: ...rGain Engineering Plant Series HRU 412 List 8A When doublers are in use the following Span Status screen displays Figure 9 Span Status Screen Doublers in Use Do any of the following Type to view the n...

Page 29: ...Set Clock This option is available during Local log on only 1 From the Main Menu type to display the Set Clock menu Figure 10 Set Clock Screen 2 Enter the time in 24 hour format at the Time prompt 3...

Page 30: ...ineering Plant Series HRU 412 List 8A System Settings 1 From the Main Menu type to display the System Settings menu Figure 11 System Settings Menu 2 View the HRU 412 List 8A system settings Change sys...

Page 31: ...s 25 View Performance Data 1 From the Main Menu type to display the Performance Data screen Figure 12 Performance Data Screen 2 If spans are in use do any of the following type to view them type to vi...

Page 32: ...gineering Plant Series HRU 412 List 8A View Performance History 1 From the Main Menu type to display the Performance History screen Figure 13 Performance History Screen 2 If spans are in use type to v...

Page 33: ...tory 1 From the Main Menu type to display the Alarm History screen Figure 14 Alarm History Screen 2 Type to update the Alarm History screen to the most current data 3 If spans are in use type to view...

Page 34: ...S1 Digital Service 1 BPVs exceed the ES threshold set at the HLU ACO Alarm Cut Off An Alarm Cut Off is in effect SMJK Smart Jack loopback Loopback at HRU 412 List 8A toward the network initiated by 2...

Page 35: ...412 List 8A supports 6 types of loopbacks see Figure 15 TLOS transmit loss of signal CREM customer remote loopback NREM network remote loopback NLOC network local loopback CLOC customer local loopbac...

Page 36: ...e network The HiGain system is in the AIS ENA Smart Jack loopback state It remains in this state until a loopdown command is detected or the default time out period if enabled at the HLU expires When...

Page 37: ...band commands include 3 in 7 command 16 bit addressable repeater commands or activation using the front panel MODE and SEL buttons When T1 loopback tests are made on the HiGain system with external me...

Page 38: ...hours a day by calling 714 730 3299 Transmission speeds up to 28 8 kbps are supported with a character format of 8 N 1 Warranty PairGain Technologies warrants this product to be free of defects and to...

Page 39: ...ipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is n...

Page 40: ...not install telephone wiring during a lightning storm Always disconnect telephone lines and power connections from wall outlets before servicing or disassembling this equipment CSA Certification The H...

Page 41: ......

Page 42: ...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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