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150-432-100-02, Revision 02

Troubleshooting

HLU-432 List 1

July 18, 2002

41

L

OOPBACK

O

PERATION

HiGain has a family of loopback options for analyzing circuit functionality. The loopback signal is transmitted
and returned to the sending device for comparison. This allows you to verify the integrity of the HDSL channels
to the HLU, and the HLU DSX-1 interface and the DS1 channels to the customer. Loopback options include:

•

Generic Loopback (GNLB) options, including the SmartJack (SMJK) option (see

Table 13 on page 42

)

•

Special Loopback (SPLB) options (see

“Special Loopback Commands” on page 43

and the following tables:

–

Addressable Repeater Loopback commands: A1LB, A2LB, A5LB (see

Table 14 on page 47

–

Addressable Repeater Loopback commands: A3LB, A4LB (see

Table 15 on page 50

Loopback commands can be initiated by:

•

selecting the loopback type using the MODE and SEL buttons on the HLU (or the Manual Loopback button
on the HRU)

•

selecting the loopback type from the Maintenance Terminal Main Menu when connected to the craft port of
the HLU or HRU

•

entering the loopback code into the test equipment connected to the HLU or HRU

Generic Loopback Commands

The HiGain Generic Loopback (GNLB) commands allow you to use inband codes to loop up either NLOC
(4-in-7) or NREM (3-in-7) towards the network. In addition, these inband codes loop up CREM (6-in-7) or CLOC
(5-in-7) towards the customer. Either loop-up condition can be terminated (looped down) with the 3-in-5 SMJK
loopdown code. All inband codes must be present for 5 seconds before the HiGain system responds. HiGain also
supports NDUn doubler loopbacks to the network and CDUn doubler loopbacks towards the customer.

summarizes the available loopbacks in the system, and

Table 13 on page 42

summarizes the HiGain

generic loopback commands. See

“GNLB Test Procedures” on page 45

for the test procedures that apply when

using the GNLB mode.

Figure 25.

Loopback Summary

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Summary of Contents for 150-2248-01

Page 1: ...ER MANUAL HLU 432 L1 HiGain RS 232 DCE B R G B R G S P A N X M T R C V D S X 1 M A R G I N dB S P A N S E L M O D E SETUP STATUS HiGain Line Unit HLU 432 List 1 Part Number 150 2248 01 CLEI Code T1L4JLGB ...

Page 2: ... respective companies Disclaimer of Liability Information contained in this document is company private to ADC DSL Systems Inc and shall not be modified used copied reproduced or disclosed in whole or in part without the written consent of ADC Contents herein are current as of the date of publication ADC reserves the right to change the contents without prior notice In no event shall ADC be liable...

Page 3: ...nspect the contents for signs of damage If the equipment has been damaged in transit immediately report the extent of damage to the transportation company and to ADC Order replacement equipment if necessary Check the packing list to ensure complete and accurate shipment of each listed item If the shipment is short or irregular contact ADC as described in the Warranty located inside the back cover ...

Page 4: ...Inspecting Shipment 150 432 100 02 iv July 18 2002 HLU 432 List 1 ...

Page 5: ...______________________________________________________________________ 10 Using the MODE and SEL Buttons 10 Setting Options through MODE and SEL 10 Resetting to Factory Default Values 11 Displaying System Parameter Settings 11 Disabling an Alarm 11 Loopback Modes 11 Using a Maintenance Terminal 12 Connecting to a Maintenance Terminal 12 Accessing the Maintenance Terminal Screens 12 Using the Maint...

Page 6: ... 52 Power Consumption with Doublers 53 Maximum Power Dissipation 55 Maximum Current Drain 55 HLU 432 Card Connector 56 Network Management Control Bus 56 Fuse Alarm 56 System Alarm Relay Output 57 Craft Port 57 Appendix B Functional Operation _____________________________________________________ 58 Timing 58 Ground Fault Detect 59 Appendix C Compatibility____________________________________________...

Page 7: ...9 13 Performance Data Screen Four Doublers Span 5 29 14 31 Day Performance History Screen No Doubler 30 15 31 Day Performance History Screen Four Doublers Span 5 31 16 Alarm History Screen No Doubler 33 17 Alarm History Screen Four Doublers Span 5 33 18 System Inventory Screen No Doubler 35 19 System Inventory Screen Four Doublers 35 20 Troubleshooting Screen for a Doubler Application 36 21 Troubl...

Page 8: ...4 Addressable Repeater Loopback Commands A1LB A2LB A5LB 47 15 Addressable Repeater Loopback Commands A3LB and A4LB 50 16 HDSL Loss Over Cables 52 17 HLU 432 List 1 Power Parameters No Doubler 52 18 HLU 432 List 1 Power Parameters Single Doubler HDU 451 List 1 or 2 53 19 HLU 432 List 1 Power Parameters Single Doubler HDU 439 or HDU 437 Lists 1 and 1B 53 20 HLU 432 List 1 Power Parameters Single Dou...

Page 9: ...pliant Low line power option 135 Vdc for circuits with a single doubler Selectable Power Feed PWRF modes Auto High and Low Grounded loop detection on High bit rate Digital Subscriber Line HDSL Bipolar Violation Transparency BPVT options Bit Error Rate BER alarm options HRU loopback screen Inventory and troubleshooting screens Loss of Signal Alarm Indicator Signal LOS AIS payload alarm option Remot...

Page 10: ...or permanent basis Provide a means of quickly deploying service in advance of fiber optic transmission systems With a HiGain system service can be provided within hours Fiber optic systems can be installed incrementally and cut over from the installed HiGain system when convenient to do so HiGain Doubler Applications For applications without doublers the HLU 432 is directly connected to the HRU by...

Page 11: ...e HLU card edge connector and the craft port refer to Appendix A Specifications on page 51 Figure 1 HLU 432 List 1 Front Panel dB HLU 432 L1 HiGain S E L S P A N B R G X M T RS 232 DCE STATUS Front panel display System option buttons DSX 1 access jacks Status LED SETUP M O D E M A R G I N S P A N B R G R C V List number Craft port D S X 1 CLEI ECI bar code label Configuration number label inside h...

Page 12: ...igent Repeater Loop ILR codes DSX 1 access jacks SPAN Provides splitting jack access both to the transmit XMT and from the receive RCV HDSL span at the DSX 1 interface Breaks the XMT and RCV paths to permit test signal insertion and retrieval BRG Provides non intrusive bridging jack access to both to the transmit XMT and from the receive RCV HDSL span at the DSX 1 interface Allows the two T1 paylo...

Page 13: ...HRU CREM Customer Remote Loopback Signal from customer is looped back to the customer at HLU 432 NDUn Network Doubler n Loopback Query to initiate loopback at doubler n to network where n is the number of the doubler NLOC Network Local Loopback DSX 1 signal is looped back to DSX 1 at HLU NREM Network Remote Loopback DSX 1 signal is looped back to DSX 1 at the HRU SMJK Remote SmartJack Loopback Sig...

Page 14: ...d One of the HDSL loops has been grounded PWRF ON Power Feed On Indicates that the HDSL loops are neither short nor grounded PWRF OFF Power Feed Off HDSL span power has been turned off by setting the PWFD option to DIS or HDSL span power has been turned off by use of the A1LB A2LB A5LB Intelligent Office Repeater IOR Power Down code PWRF SHRT Power Feed Short Indicates a short between the two HDSL...

Page 15: ...eceipt of the equipment visually inspect the contents for signs of damage If the equipment has been damaged in transit immediately report the extent of damage to the transportation company and to ADC When installing an HLU 432 in a chassis be sure to wear an antistatic wrist strap Avoid touching components on the circuit board 200 mechanics enclosure HL U 43 2 L1 HiGa in M A R G I N dB S E L SE TU...

Page 16: ...ate with downstream devices status LED flashes green One of the following occurs If downstream devices are successfully identified and the HDSL loops synchronize the HLU status LED will be a steady green The HLU reports normal margin messages on the front panel display If downstream devices are not successfully identified the HLU reports four character status messages and enters self test mode The...

Page 17: ... to the craft port can handle all provisioning tasks Tasks that you need to complete are 1 Set the time and date see Set Clock Screen on page 18 2 Set the circuit IDs see View System Inventory Screen on page 34 Assuming that the HLU has been successfully installed and provisioned you should do the following to ensure an accurate Alarm History and Performance History 1 Clear the Span Status Perform...

Page 18: ...display alternately shows the first system parameter and its current setting 2 Press the SEL button to step the display through all possible settings one at a time of the selected parameter 3 After the desired setting has been selected press the MODE button This updates the current displayed parameter to the selected setting and then advances to the next configurable parameter After the last param...

Page 19: ...ing System Parameter Settings To scroll through the current settings of all system parameters press the MODE button for three or more seconds The following parameters are displayed HLU software version number HLU List number Type of frame pattern being received from the DSX 1 Line code of the signal being received from the DSX 1 see note HDSL power level setting All user configured parameter setti...

Page 20: ...ty 8 data bits 1 stop bit hardware flow control to OFF 5 Press the several times to initiate the autobaud connection and to initialize the Maintenance Terminal screens Accessing the Maintenance Terminal Screens The following sections describe how to use the Maintenance Terminal screens to view provision and diagnose an HLU 432 system Navigation Keys Table 3 lists keys you can use on the maintenanc...

Page 21: ...pbacks at both the network and customer side 25 View Performance Data Provides access to subscreens that allow you to view the Errored Seconds ES and Unavailable Seconds UAS between the HLU and the HRU in 15 minute intervals over a 4 hour time period per screen for a total of 24 hours 6 screens 28 View Performance History Provides access to subscreens that allow you to view the ES and UAS between ...

Page 22: ...nd on whether the system includes one two three or four doublers Press from the Maintenance Terminal Main Menu to open the Span Status screen Figure 5 on page 15 If no doubler HDU is present the screen reports span status for the subscriber lines between the HLU and the HRU If there are additional doublers the Span Status screen reports status on each span Figure 6 on page 15 shows status between ...

Page 23: ...E ATTN 00 00 00 00 dB INS LOSS 00 00 00 00 dB 24 HOUR ES 00000 00000 00000 00000 seconds 24 HOUR UAS 00000 00000 00000 00000 seconds DS1 STATUS HLU HRU 24 HOUR ES Count 00000 00000 24 HOUR UAS Count 00000 00000 Frame type ESF ESF Code type AMI AMI AUTOUPDATE OFF E xit C lear A uto U pdate SPAN 5 STATUS TIME 00 01 50 DATE 04 13 00 CIRCUIT ID ALARMS NONE LOOPBACK OFF POWER LEVEL HIGH HLU HDU1 HDSL 1...

Page 24: ...kHz loss The normal HiGain ATTN operation range is from 0 to 28 dB INS Loss Indicates the approximate insertion loss of the loops at the HDSL line rate of 196 kHz It is generated by multiplying the pulse attenuation by 1 25 Normal range is 0 dB to 35 dB 24 Hour ES The number of one second intervals that contained at least one CRC error This value is a running total of the last 24 Hours 24 Hour UAS...

Page 25: ... DC voltage and Loop 2 is specified to carry the simplex DC voltage SPx indicates that the first occurrence of a reversed span is on Span x where x is the span number CLOC Customer Local Loopback Loopback at HRU local to CI initiated from Customer Premises Equipment CPE by the ILR 2 code the MODE and SEL buttons on the HLU 432 front panel or by the maintenance terminal CREM Customer Remote Loopbac...

Page 26: ...The Update Remote field appears Update the HRU Date and Time The remote unit date and time is set by using this option Do one of the following Press to update the HRU to the same date and time set for the HLU 432 Press The date and time are not updated All time information is lost when power is removed The last date however is retained in NVRAM and reappears when power is restored When editing ent...

Page 27: ...option letter to change that setting Press to set all user options to the factory default values If changes were made press to confirm or press any other key to ignore changes Press to exit and return to the main menu C SYSTEM SETTINGS TIME 10 12 34 DATE 04 14 00 CIRCUIT ID A EQUALIZATION 0 P MARGIN ALARM THRESH 4 B SMART JACK LPBK ENABLED Q RLOS DS1 LOS ALARM ENABLED C SPECIAL LPBK GNLB R ALARM P...

Page 28: ...e repeater Power PLEV DIS Disables powering to the HDSL pair See HDSL Line Voltage Options on page 24 LOW Keeps the HDSL line voltage at 135 Vdc maximum for all applications AUTO Allows the HDSL line voltage to automatically switch between 135 Vdc maximum for non doubler applications and 112 Vdc for doubler applications HIGH Forces the HDSL line voltage to 112 Vdc for all applications ZBTSI ZBTS O...

Page 29: ...U 432 and HRU T1 output ports when either of the two HDSL loops is not in sync LOSW or if a Margin alarm occurs AIS on SMJK NREM SAIS ENA Causes the HRU to transmit the AIS signal towards the Customer Interface CI when in NREM or SmartJack loopback DIS Causes the HRU to either transmit the signal from the network towards the CI RCV port or to open and terminate its RCV CI port when an HRU NREM or ...

Page 30: ...SL loop of each span are also counted and added in with the BPV count to produce a Total Error Count TEC that indicates the integrity of both the T1 and HDSL paths A TEC in each direction is calculated each second by adding the number of BPVs to the number of HDSL CRCs in that direction The maximum TEC number is 12000 This TEC number is converted into BPVs at the distant end during the following s...

Page 31: ...unused DS0 channels of a fractional T1 service are filled with information other than an idle code of all ones the HiGain system blocks this information from reaching the remote end of the circuit and replaces those DS0 channels with an idle code of all ones Blocking the idle code results in a mismatch between the CRC checksum delivered to the remote end when the payload is in the ESF format and t...

Page 32: ...n at turn up when one conductor does open a system alarm occurs and causes the AIS LOS condition This alerts the maintenance personnel of the problem 2LP requires both HDSL loops to be out of sync LOSW before the HAIS signal is transmitted 2LP preserves the integrity of the 12 surviving channels when just one loop is lost HDSL Line Voltage Options The PWRF option has four settings for HDSL line po...

Page 33: ...elect HRU Network Loop Press to select HLU Customer Loop Press to select HRU Customer Loop For doubler applications additional loopback selections appear on the screen Press to exit and return to the previous menu Table 9 lists the HLU 432 Loopback field messages and descriptions Table 9 Loopback Field Messages and Descriptions Messages Full Name Description NREM Network Remote Loopback Loopback a...

Page 34: ...NLOC C NETWORK LOOP HRU NREM G CUSTOMER LOOP HLU CREM H CUSTOMER LOOP HRU CLOC E xit LOOPBACK MENU TIME 00 03 33 DATE 04 05 00 CIRCUIT ID A DISABLE LOOPBACKS B NETWORK LOOP HLU NLOC M NETWORK LOOP DOUBLER 4 NDU4 C NETWORK LOOP HRU NREM N CUSTOMER LOOP DOUBLER 4 CDU4 D NETWORK LOOP DOUBLER 1 NDU1 F NETWORK LOOP DOUBLER 2 NDU2 G CUSTOMER LOOP HLU CREM H CUSTOMER LOOP HRU CLOC I CUSTOMER LOOP DOUBLER...

Page 35: ...Maintenance Terminal Main Menu Disabling a Loopback The Disable Loopbacks option Figure 9 on page 26 allows you to disable cancel any of the loopbacks listed in the screen To disable loopbacks press in the Loopback Menu The following prompt appears PLEASE WAIT A series of dots moves from left to right indicating that the command has been issued When this process completes the system returns to the...

Page 36: ...hour data screen Press to view the next available span for doubler applications Press or to select a specific span for doubler applications Press to exit All Performance Data counters can be set to zero by pressing Clear from the HLU 432 Span Status screen shown in Figure 5 on page 15 The HLU 432 is considered the master module it clears all performance data screens at both the HLU 432 and the HRU...

Page 37: ...fifth span HDU4 to the HRU Figure 13 Performance Data Screen Four Doublers Span 5 Date 04 05 00 PERFORMANCE DATA CIRCUIT ID ERRORED SECONDS UNAVAILABLE SECONDS DS1 HDSL 1 HDSL 2 HLU HRU HLU HRU HLU HRU 00 00 00 15 00 30 00 45 01 00 01 15 01 30 01 45 02 00 02 15 02 30 02 45 03 00 03 15 03 30 03 45 001 002 002 004 014 006 003 013 007 001 E xit P revious N ext Date 04 05 00 SPAN 5 PERFORMANCE DATA CI...

Page 38: ...us for the previous screen Press to exit from the Performance History screen Performance History Screen without Doubler Figure 14 shows a non doubler application Figure 14 31 Day Performance History Screen No Doubler All Performance History counters can be set to zero by pressing Clear from the HLU 432 Span Status screen shown in Figure 5 on page 15 The HLU 432 is considered the master module it c...

Page 39: ...ve span screens Figure 15 31 Day Performance History Screen Four Doublers Span 5 Time 00 26 29 SPAN 5 PERFORMANCE HISTORY 31 DAY CIRCUIT ID ERRORED SECONDS UNAVAILABLE SECONDS DS1 HDSL 1 HDSL 2 HLU HRU HDU4 HDRU HDU4 HRU 01 17 01 18 01 19 01 20 01 21 01 22 01 23 01 24 01 25 01 26 01 27 01 28 01 29 00001 00005 00415 00035 00492 01 30 01 31 00001 00002 00002 00004 00014 00006 00003 00013 00007 00001...

Page 40: ...ly to the Alarm History for doubler applications as well Table 11 Alarm History Fields and Descriptions Field Description Type Identifies the type of alarm LOS DS1 HLU First and last instance of LOS at the HLU current condition number of alarms LOS DS1 HRU First and last instance of LOS at the HRU current condition number of alarms BER First and last instance of a BER at the HRU current condition ...

Page 41: ...n 5 ALARM HISTORY TIME 00 27 54 DATE 04 07 00 CIRCUIT ID Type First Last Current Count LOS DS1 HLU OK 000 LOS DS1 HRU OK 000 BER OK 000 SPAN1 LOSW HDSL1 02 01 00 00 00 02 01 00 00 00 OK 001 SPAN1 LOSW HDSL2 02 01 00 00 00 02 01 00 00 00 OK 001 SPAN1 MARGIN L1 OK 000 SPAN1 MARGIN L2 OK 000 PWR SHRT OK 000 PWR GND OK 000 LAST CLEARED NONE E xit C lear U pdate ALARM HISTORY TIME 10 57 59 DATE 04 14 0...

Page 42: ...ll detected modules have the product number listed Whenever the HLU 432 loses sync with Span 1 the product types are replaced by the N A label until sync is reestablished and each module can in turn be reidentified Only the Circuit ID appears in the other HLU 432 Terminal Maintenance screens Press at the Maintenance Terminal Main Menu to display the System Inventory screen Figure 18 and Figure 19 ...

Page 43: ...D UNIT PRODUCT CLEI UNIT ID HLU HLU 432 L1 V7 3 T1L4JLGB NOT REQUIRED B HRU HRU 488 L1 V1 0 T1L3KL7D C DB1 N A D DB2 N A F DB3 N A G DB4 N A E xit Enter the item letter to change any ID SYSTEM INVENTORY TIME 10 59 37 DATE 04 14 00 A CIRCUIT ID UNIT PRODUCT CLEI UNIT ID HLU HLU 432 L1 V7 3 T1L4JLGB NOT REQUIRED B HRU HRU 488 L1 V1 0 T1L3KL7D C DB1 HDU 409 L2 V1 6 T1R6AEDC D DB2 HDU 409 L2 V1 6 T1R6...

Page 44: ... 1 1 1 1 ___ 2 ___ 2 ___ 2 ___ 2 ___ 2 ___ NTWK HLU HDU1 HDU2 HDU3 HDU4 HRU CUST SYSTEM OPERATIONAL AUTOUPDATE OFF E xit A uto U pdate B ack L oopbacks HDSL Loop 1 HDSL Loop 2 Signal direction Doubler 4 TIME 11 01 51 TROUBLESHOOTING with HELP DATE 04 14 00 CIRCUIT ID ___ ___ ___ ___ ___ ___ 1 1 1 1 1 ___ 2 ___ 2 ___ 2 ___ 2 ___ 2 ___ NTWK HLU HDU1 HDU2 HDU3 HDU4 HRU CUST SYSTEM OPERATIONAL SYMBOLS...

Page 45: ... Loss screens Press to update a screen Press to automatically update the screen Press again to deactivate automatic update The Troubleshooting screen indicates whether AutoUpdate is on or off Press to directly access the Loopback menu see Loopback Mode Screen on page 25 Figure 22 Troubleshooting with Help H M I H M I E B U A A L TIME 11 01 51 TROUBLESHOOTING with HELP DATE 04 14 00 CIRCUIT ID ___ ...

Page 46: ...s a margin lower than 4 dB Low margin is a result of high noise level and or low HDSL signal level Some causes of low margin Long loop External interference Excessive cross talk AUTOUPDATE OFF E xit A uto U pdate B ack I TIME 00 30 11 TROUBLESHOOTING with INSERTION LOSS VALUES DATE 04 07 00 CIRCUIT ID ___ ___ ___ ___ ___ ___ 35 36 36 36 36 36 36 36 36 35 ___ 36 36 ___ 36 36 ___ 36 36 ___ 36 36 ___...

Page 47: ...s of Signal Loss of the DSX 1 input signal Cannot be inhibited ALRM RLOS Remote Loss of Signal Loss of the HRU DS1 input signal Disable the RDA Remote DS1 Alarm option This prevents an LOS condition at the DS1 input to a HRU from closing the alarm contacts pins 20 and 21 on the card edge connector The front panel Status LED still flashes red and the ALRM RLOS message displays to alert you of the L...

Page 48: ...m alarm press the SEL button and execute an Alarm Cutoff ACO An ACO turns the alarm off and replaces the ALRM message with an ACO message The second part of the ALRM message which defines the cause of the alarm remains Both parts of the message remain until the alarm condition clears or another higher priority alarm occurs Self Test The Self Test mode that occurs when both HDSL loops are not in sy...

Page 49: ...L buttons on the HLU or the Manual Loopback button on the HRU selecting the loopback type from the Maintenance Terminal Main Menu when connected to the craft port of the HLU or HRU entering the loopback code into the test equipment connected to the HLU or HRU Generic Loopback Commands The HiGain Generic Loopback GNLB commands allow you to use inband codes to loop up either NLOC 4 in 7 or NREM 3 in...

Page 50: ...Customer Doubler 4 Invokes HDU4 loopback towards the customer X X X CREM 1111110 6 in 7 Customer Remote Invokes HLU loopback towards the customer X X X SMJK LpUp PL 11000 2 in 5 SmartJack Loopup or NID payload PL code Invokes HRU loopback towards network X SMJK LpUp ESF DL 1111 1111 0100 1000 SmartJack Loopup or NID ESF DL code Invokes HRU loopback towards network X SMJK LpDn PL 11100 3 in 5 Smart...

Page 51: ...Telephone A5LB Teltrend Mod 1 Southern New England Telephone SNET Southwestern Bell Pacific Bell The A1LB loopback selection complies with that proposed for HDSL systems in the T1E1 4 92 recommendation with the following additions query loopback IOR Intelligent Office Repeater power down four loopback time out choices initiation from either end repeating bit error signatures alternate query loopba...

Page 52: ...ck ND1 ND2 ND3 ND4 NRE CRE CD1 CD2 CD3 CD4 CLO 4 Press SEL to activate the selected loopback The previous loopback is terminated Once a loopback is selected and activated the loopback stays active until it times out based on the LBTO setting When a loopback times out the display then returns to the normal display mode With the exception of SmartJack any of the HiGain loopbacks can be executed usin...

Page 53: ...bridging jacks as shown in Figure 1 on page 3 Connecting one cable between the two bridging jacks and another between the two SPAN jacks splits the XMT and RCV and creates metallic loopbacks towards both the DSX 1 and the HLU 432 If separate plugs are inserted into both SPAN jacks with the other end disconnected the BRG jacks can be used to send and receive test patterns towards the DSX 1 GNLB Tes...

Page 54: ...Troubleshooting 150 432 100 02 Revision 02 46 July 18 2002 HLU 432 List 1 Figure 26 Loopback Configurations ...

Page 55: ...ors detected by the test set varies from 229 to 231 depending on whether or not the test set counts frame errors as bit errors and on the number of frame bits contained in the block of 231 error bits The HRU and HLU generate this bit pattern in a series of discontinuous bursts containing 20 bit errors each including frame bits Those test sets that do not count frame error bits as data bit errors w...

Page 56: ...bler 4 was sent 20 errors if ILR 2 HRU was sent d normal looped data This error pattern repeats every 20 seconds as long as the IOR loopback pattern is being sent This also applies to ILR Time out Override and Query commands The HLU is now in logic loopback if the IOR NLOC loopback command was sent The Time out Override command or a Loopdown command can override the selection made for the loopback...

Page 57: ...down disarmed and returned to normal operation send the disarm inband code 11100 or the ESF DL code FF24 The Armed mode has an automatic time out of 120 minutes but this timer is reset to 120 for any of the following events Loopback terminates manually or time out Query Alternate query Far end activate Another ARM command This timer is inhibited while any of the valid command codes are being sent ...

Page 58: ...inary Code a Hexadecimal Equivalent a The left most bit arrives first in all sequences The detection algorithm functions reliably with a random 10 3 Bit Error Ratio BER on the facility The entire arming and loopback sequence can also be initiated at the remote HRU location NLOC HLU 432 line unit from NI 1111 1111 0001 1110 FF1E CREM HLU 432 line unit from CI 0011 1111 0001 1110 3F1E NDU1 HDU doubl...

Page 59: ... Impedance 100 W DSX 1 Pulse Output 6 V pk pk pre equalized for 0 655 feet of ABAM cable DSX 1 Input Level 1 5 to 7 5 dBDSX DS1 Line Rate 1 544 Mbps 200 bps DS1 Line Format AMI B8ZS or ZBTSI DS1 Frame Format ESF SF or UNFR Maximum Heat Dissipation See Power Consumption on page 52 Fusing Internal connected to Fuse Alarm output on pin 32 HDSL Span Voltage 135 Unipolar or 112 Bipolar Electrical Prote...

Page 60: ...maximum power dissipation and its maximum current drain Table 17 describes line powered circuits on 9 kft 26 AWG loops without a doubler Table 16 HDSL Loss Over Cables Cable Gauge Loop Loss a dB per kft a At 196 kHz 68 F 20 C Loop Resistance W per kft 26 AWG 0 4 mm 3 88 83 24 AWG 0 51 mm 2 84 52 22 AWG 0 61 mm 2 18 32 19 AWG 0 91 mm 1 54 16 A Windows based program Cable Calculator may be downloade...

Page 61: ...12 List 6 7 8 OFF 24 3 26 7 7 1 7 8 571 628 HRU 402 N A OFF 21 23 1 6 3 6 9 494 543 Table 19 HLU 432 List 1 Power Parameters Single Doubler HDU 439 or HDU 437 Lists 1 and 1B HRU Model No HRU CPE Power 42 5 Vdc Power Consumption Watts Heat Dissipation Watts 42 5 Vdc Current mA Typical Maximum Typical Maximum Typical Maximum HRU 412 List 1 2 3 4 ON 22 3 24 5 7 9 8 6 525 578 HRU 412 List 1 2 3 4 OFF ...

Page 62: ...Maximum Typical Maximum Typical Maximum HRU 412 List 1 2 3 4 OFF 30 3 33 3 8 0 8 8 713 784 HRU 412 List 6 7 8 OFF 28 1 30 9 7 7 8 5 660 726 HRU 402 N A OFF 24 8 27 3 7 2 7 9 584 642 Table 23 HLU 432 List 1 Power Parameters Two Doublers HDU 409 List 2 HRU Model No HRU CPE Power 42 5 Vdc Power Consumption Watts Heat Dissipation Watts 42 5 Vdc Current mA Typical Maximum Typical Maximum Typical Maximu...

Page 63: ...sures are determined by applying its power parameters to the manufacturer s requirements for each specific housing The 42 5 Vdc Power Consumption is the maximum total power that the HLU 432 consumes or draws from the shelf power source This parameter is needed when the HLU 432 is in a location remote to the CO it is serving It determines the battery capacity required to maintain an 8 hour standby ...

Page 64: ...ontrol Bus on pin 46 of the card edge connector This allows the various ADC Management System protocols to manage the HLU through the HMU 319 HiGain Management Unit Whenever the HLU 432 is under management the MNGD message appears periodically on the HLU 432 front panel display Fuse Alarm Pin 25 on the card edge connector is a Fuse Alarm that is driven to 48 Vdc whenever the onboard fuse opens Som...

Page 65: ...nd 30 Figure 27 on page 56 comprise the HLU 432 system alarm output These alarm contacts close for any system alarms condition See View Troubleshooting Screen on page 36 for further information CRAFT PORT Figure 28 shows the pinout for the craft port connector and its connection to a DB 9 or DB 25 connector on a maintenance terminal Figure 28 RS 232 Craft Port Pinouts ...

Page 66: ...LU 432 is shown in Figure 29 The unit receives a 1 544 Mbps DSX 1 data stream from the DSX 1 digital cross connect interface The HLU 432 contains a DS1 frame synchronizer controlled by an 8 bit microprocessor that determines the type of framing on the DS1 stream and synchronizes with it The HLU 432 recognizes SuperFrame SF including D4 or Extended SuperFrame ESF framing When the data is unframed t...

Page 67: ...high 112 Vdc applications When the circuit is active the system is compliant with Class A2 requirements of GR 1089 When the circuit is not active the system is compliant with Class A3 requirements of GR 1089 Whenever the GFD circuit detects a grounded loop the line power is immediately removed from the spans and a PWR FEED GND alarm is generated and displayed The power is reapplied 30 seconds late...

Page 68: ...HiGain HLU and HRU modules are compatible with each other Although all HiGain doublers are backward compatible with all prior HLU and HRU models some of the circuit application enhancements of newer doubler models require that all circuit modules be of the same vintage in order to realize these enhancements Enhanced doubler applications preclude the mixing of newer doubler models with older models...

Page 69: ...e Powered Local Powered Line Powered Local Powered HLU Model I CPE ON I CPE OFF I CPE ON I CPE OFF I CPE ON I CPE OFF I CPE ON I CPE OFF I CPE ON I CPE OFF I CPE ON I CPE OFF HLU 231 List 3D 6D HLU 319 List 2X HLU 388 List 2X 1 1 2 2 1 1 2 2 1 1 2 2 HLU 231 List 7X HLU 431 List 1D 1 1 2 2 1 2 b b 2000 W maximum loop resistance Requires HRU 412 List 7A L8A or HRU 402 2 2 1 2 2 2 HLU 231 Lists 8 8D ...

Page 70: ... to installation Network Design and Integration Testing System Turn Up and Testing Network Monitoring upstream or downstream Power Monitoring and Remote Surveillance Service Maintenance Agreements Systems Operation ADC Technical Assistance Center 800 638 0031 714 730 3222 Fax 714 730 2400 Email wsd_support adc com Technical Information System Network Configuration Product Specification and Applica...

Page 71: ...ack CEV Controlled Environmental Vault CI Customer Installation CLEI Common Language Equipment Identifier CO Central Office CRC Cyclical Redundancy Check CREM Customer Remote Loopback CSA Carrier Service Area CSU Channel Service Unit D dB Decibel DDS Digital Data Service DIS Disabled DLC Digital Loop Carrier DS0 Digital Signal Level 0 DS1 Digital Signal Level 1 DSU Digital Service Unit DSX 1 Digit...

Page 72: ...ment Building System NID Network Interface Device NLOC Network Local Loopback NMA Network Management and Administration NVRAM Non Volatile RAM P PL Payload POTS Plain Old Telephone System PWRF Power Feed PWRF GND Power Feed Ground PWRF OFF Power Feed Off PWRF ON Power Feed On PWRF SHRT Power Feed Short R RAIS Remote Alarm Indicating Signal RCV Receive RDA Remote DS1 Alarm RLOSL Remote Loss of Sign...

Page 73: ...o charge if it is returned to ADC during the 30 day warranty period along with proof of the date of shipment The transportation charges for shipment of returned products to ADC will be prepaid by the Buyer ADC will pay transportation charges for shipment of replacement products to Buyer unless no trouble is found NTF in which case the Buyer will pay transportation charges ADC may use reconditioned...

Page 74: ...ED FIRM ISO 9001 TL 9000 ADC DSL Systems Inc 14402 Franklin Avenue Tustin CA 92780 7013 Tel 714 832 9922 Fax 714 832 9924 Technical Assistance Tel 800 638 0031 Tel 714 730 3222 Fax 714 730 2400 DOCUMENT 150 432 100 02 GP 54 1239485 ...

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