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Troubleshooting

150-388-151-01, Revision 01

46

September 15, 1999

HLU-388 List 5A

Table 14.

Summary of HiGain Loopback Codes

Method of Transmission

Loopback

Code

Description

Test Set

Craft Port

MODE/SEL

NLOC

1111000

4-in-7

Network Local. Invokes HLU loopback toward the network.

X

X

X

NDU1

110000

2-in-6

Network Doubler #1. Invokes HDU1 loopback toward the
network.

X

X

X

NDU2

111000

3-in-6

Network Doubler #2. Invokes HDU2 loopback toward the
network.

X

X

X

NDU3

1010001

Network Doubler #3. Invokes HDU3 loopback toward the
network.

X

X

X

NDU4

1010010

Network Doubler #4. Invokes HDU4 loopback toward the
network.

X

X

X

NREM

1110000

3-in-7

Network Remote. Invokes HRU loopback towards the
network.

X

X

X

CLOC

1111100

5-in-7

Customer Local. Invokes HRU loopback towards the
customer.

X

X

X

CDU1

111100

4-in-6

Customer Doubler #1. Invokes HDU1 loopback towards
the customer.

X

X

X

CDU2

111110

5-in-6

Customer Doubler #2. Invokes HDU2 loopback towards
the customer.

X

X

X

CDU3

1011001

Customer Doubler #3. Invokes HDU3 loopback towards
the customer.

X

X

X

CDU4

1011010

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

SmartJack Loopdown or NID payload (PL) code. Removes
SMJK, NLOC, NREM, CREM, CLOC, CDU

n

, and NDU

n

.

X

SMJK LpDn

(ESF-DL)

1111-1111-
0010-0100

SmartJack Loopdown or NID (ESF-DL) code. Removes
SMJK, NLOC, NREM, CREM, CLOC, CDU

n

, and NDU

n

.

X

HiGain systems feature the SmartJack option, which can emulate a Network Interface Device
(NID) for the purpose of loopback testing of the HiGain circuit. SMJK and NREM loopbacks
perform the same functions but their initiation differs. SMJK indicates that the loopback was
initiated by the 2-in-5 inband command. NREM is initiated by the 3-in-7 inband command or by
a command issued from the maintenance terminal or the MODE and SEL buttons.

Use the inband commands to enable or disable the SMJK loopback options. (Pressing the
remote loopback button will also loop down the SmartJack loopback.) The HLU-388 system
setting is normally enabled to recognize all inband SmartJack loopback commands.

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Summary of Contents for T1L2N20A

Page 1: ... TECHNOLOGIES INC ENGINEERING SERVICES TECHNICAL PRACTICE SECTION 150 388 151 01 Model List Number Part Number CLEI Code HLU 388 5A 150 1141 51 T1L2N20A MODE SEL M A R G I N dB SETUP STATUS RS 232 DCE HLU 388 H G HD I AIN L 5A ...

Page 2: ...ies Inc and shall not be modified used copied reproduced or disclosed in whole or in part without the written consent of PairGain Information furnished by PairGain Technologies is believed to be accurate and reliable However no responsibility is assumed by PairGain Technologies for its use nor for any infringement of patents or other rights of third parties which may result from its use No license...

Page 3: ...ent in the subject area of the email message INSPECTING THE SHIPMENT Upon receipt of the equipment Unpack each container and 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 PairGain Order replacement equipment if necessary Check the packing list to ensure complete and accurate shipmen...

Page 4: ...eam Device 9 Verification with a Downstream Device 9 Provisioning Requirements 10 Provisioning_________________________________________________________________________ 11 Using the MODE and SEL Buttons 11 Setting Options through MODE and SEL 11 Resetting to Factory Default Values 12 Displaying System Parameter Settings 12 Disabling an Alarm 12 Loopback Modes 12 Using a Maintenance Terminal 13 Conn...

Page 5: ... Consumption 56 Power Consumption without Doublers 56 Power Consumption with Doublers 57 Maximum Power Dissipation 59 Maximum Current Drain 59 HLU 388 List 5A Card Connector 60 Network Management Control Bus 60 Fuse Alarm 60 Craft Port 61 Appendix B Functional Operation _____________________________________________________ 62 Timing 62 Ground Fault Detect 62 Appendix C Compatibility ______________...

Page 6: ...4 31 Day Performance History Screen No Doubler 33 15 31 Day Performance History Screen Four Doublers Span 5 34 16 Alarm History Screen No Doubler 36 17 Alarm History Screen Four Doublers Span 5 36 18 System Inventory Screen No Doubler 38 19 System Inventory Screen Four Doublers 38 20 Troubleshooting Screen for a Doubler Application 39 21 Troubleshooting Screen Describing Circuit Problem 39 22 Trou...

Page 7: ...essable Repeater Loopback Commands A1LB A2LB A5LB 51 16 Addressable Repeater Loopback Commands A3LB and A4LB 54 17 HDSL Loss Over Cables 56 18 HLU 388 Power Parameters No Doubler 56 19 HLU 388 Power Parameters Single Doubler HDU 451 List 1 or 2 57 20 HLU 388 Power Parameters Single Doubler HDU 439 or HDU 437 Lists 1 and 1B 57 21 HLU 388 Power Parameters Single Doubler HDU 409 List 2 HDU 407 List 2...

Page 8: ...List of Tables 150 388 151 01 Revision 01 viii September 15 1999 HLU 388 List 5A ...

Page 9: ...er Stratum 1 compliant Low line power option setting 140 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 Screen displays Circuit ID and unit IDs Loss of Signal Alarm Indicator Signa...

Page 10: ...ems provide a cost effective easy to deploy method for delivering T1 High Capacity Digital Service HCDS over metallic pairs The service is deployed over two unconditioned non loaded copper pairs yet it demonstrates a quality that is competitive with fiber optics Conventional in line T1 repeaters are not required Cable pair conditioning pair separation and bridged tap removal are not required Each ...

Page 11: ...y powered the HLU 388 List 5A can power up to four doublers for a total of five spans Personal Communications System Applications The HLU 388 List 5A is required for Personal Communications System PCS applications that use the HRU 411 The HRU 411 has an onboard 130 Vdc 8 5 W power supply that can power the 200 mW PCS remote radio ports The line unit recognizes the HRU 411 if CPE POWER switch is se...

Page 12: ...in Table 2 on page 5 For pinout diagrams of the HLU card edge connector and the craft port refer to Appendix A Specifications on page 55 Figure 1 HLU 388 List 5A Front Panel Front panel display List number RS 232 craft port 210 jack Setup buttons Status LED Configuration number CLEI ECI bar code label M A R G I N dB HLU 388 HiGain HD L RS 232 DCE STATUS SETUP MODE SEL PAIRGAIN 5A ...

Page 13: ...8 List 5A Customer Remote Loopback CREM or a Network Local Loopback NLOC is in effect Flashing yellow HLU 388 List 5A is armed to respond to Intelligent Repeater IR Loop Codes RS 232 craft port Provides bidirectional communication between the unit and an external terminal to allow configuration and performance monitoring through the Maintenance Terminal screens CLEI and ECI bar code label Provides...

Page 14: ...emote Loss of Signal Indicates that no signal is detected at the DS1 input to the HRU Causes a system alarm LOOPBACK MESSAGES CDUn Customer Doubler Unit n Loopback Query to initiate loopback at doubler n to Customer Interface CI where n is the number of the doubler CLOC Customer Local Loopback Signal from customer is looped back to the customer at the HRU CREM Customer Remote Loopback Signal from ...

Page 15: ...he HLU is under control of the HMU 319 network management unit In this state the front panel craft port is disabled PWR FEED GND Power Feed Ground One of the HDSL loops has been grounded PWR FEED ON Power Feed On Indicates that the HDSL loops are not grounded or shorted PWR FEED OFF Power Feed Off HDSL span power has been turned off by setting the PWFD option to DIS or HDSL span power has been tur...

Page 16: ...e unit into the shelf 3 Press down on the front panel until the unit is secure Upon receipt of the equipment 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 PairGain Technologies When installing an HLU in a chassis be sure to wear an antistatic wrist strap Avoid touching components on...

Page 17: ...fication with a Downstream Device If a downstream device has been installed 1 Verify that the HLU powers up The front panel display illuminates and reports status messages 2 Verify that the HLU attempts to communicate with downstream devices status LED flashes red One of the following occurs If downstream devices are successfully identified and the HDSL loops synchronize the HLU status LED will be...

Page 18: ...minal screens to configure the HLU While the MODE and SEL buttons can be used to manually accomplish some provisioning tasks such as setting system options the Maintenance Terminal screens available when you connect a PC 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 21 2 Set the circuit IDs see System In...

Page 19: ...ase it The front panel display alternately shows the first system parameter and its current setting 2 Press the SEL button to step through all possible settings 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 paramete...

Page 20: ...ing System Parameter Settings To scroll through the current settings of all system parameters press the MODE button for 3 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 the note below HDSL power level setting All user configured parameter...

Page 21: ...ance terminal you can access the maintenance provisioning and performance screens To connect to a maintenance terminal 1 Insert the 210 to DB9 adapter into the jack on HLU 388 front panel 2 Connect an RS 232 cable to the adapter 3 Connect the other end of the cable to the console port on the maintenance terminal 4 If necessary start a terminal emulation program such as ProComm emulating a VT 100 t...

Page 22: ...creens Table 4 Navigational Keys on the Maintenance Terminal Key Function Automatically updates the screen data Updates screen data Clears screen data Selects the next Span Status screen for doubler applications or Selects a specific Span Status screen for doubler applications Selects the previous page of screen data Selects the next page of screen data Exits the current screen Selects the Loopbac...

Page 23: ...disable loopbacks at both the network and customer side 28 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 31 View Performance History Provides access to subscreens that allow you to view the ES and U...

Page 24: ...plications the available Span Status screens depend 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 17 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 ea...

Page 25: ...6 4 5 6 7 8 SPAN STATUS TIME 00 27 25 DATE 08 15 99 CIRCUIT ID ALARMS NONE LOOPBACK OFF POWER LEVEL LOW HLU HRU HDSL 1 HDSL 2 HDSL 1 HDSL 2 cur min max cur min max cur min max cur min max MARGIN 21 20 22 23 22 24 21 19 22 22 21 24 dB PULSE ATTN 00 00 00 00 dB INS LOSS 00 00 00 00 dB 24 HOUR ES 00004 00003 00006 00007 seconds 24 HOUR UAS 00014 00013 00000 00001 seconds DS1 STATUS HLU HRU 24 HOUR ES...

Page 26: ...IME 12 06 04 DATE 08 15 99 ALARMS NONE LOOPBACK OFF POWER LEVEL HIGH HDU4 HRU HDSL 1 HDSL 2 HDSL 1 HDSL 2 cur min max cur min max cur min max cur min max MARGIN 23 23 23 23 21 23 24 20 25 24 21 24 dB PULSE ATTN 07 07 07 07 dB INS LOSS 08 08 08 08 dB 24 HOUR ES 00010 00008 00001 00002 seconds 24 HOUR UAS 00021 00020 00004 00002 seconds DS1 STATUS HLU HRU 24 HOUR ES Count 00000 00017 24 HOUR UAS Cou...

Page 27: ...96 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 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 28: ...tage and Loop 2 is specified to carry the simplex DC voltage SPn indicates that the first occurrence of a reversed span is on Span n where n is the number of the span 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 388 front panel or by the maintenance terminal CREM Customer Remote Loopbac...

Page 29: ...en press The Update Remote field appears Update the HRU Time and Date 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 388 List 5A 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...

Page 30: ...etter to change that setting Press to set all user options to the factory default values If changes were made press when exiting to confirm or press any other key to ignore changes Press to exit and return to the main menu SYSTEM SETTINGS TIME 12 46 06 DATE 08 15 99 CIRCUIT ID A EQUALIZATION 0 O MARGIN ALARM THRESH 4 B SMARTJACK LPBK ENABLED P RLOS DS1 LOS ALARM ENABLED C SPECIAL LPBK GNLB Q ALARM...

Page 31: ...gures the HiGain system to respond to the inband loopback codes of the Wescom Mod 1 addressable repeater A5LB Configures the HiGain system to respond to the inband loopback codes of the Teltrend Mod 1 addressable repeater Power PWRF DIS Disables power to the HDSL pair See HDSL Line Voltage Options on page 27 LOW Keeps the HDSL line voltage at 140 Vdc maximum for all applications AUTO Allows the HD...

Page 32: ...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 SmartJack loopback is executed The AIS sig...

Page 33: ...VT option is Disabled DIS LOSW conditions may take up to 10 seconds In addition the CRCs in each direction of every HDSL 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 dire...

Page 34: ...cked for all HiGain system loopback tests for all DS1 blocking settings This allows the standard full bandwidth T1 loopback tests to be performed for all DS0 blocking settings If any of the 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 ...

Page 35: ...lerts 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 power feed DIS LOW AUTO and HIGH DIS disables any voltage from being applied to the HDSL cable pairs It i...

Page 36: ...ons additional loopback selections appear on the screen Type to exit and return to the previous menu Table 10 lists the HLU 388 Loopback field messages and descriptions If the HLU 388 is used with the HRU 411 to power PCS sites the PWRF option should be set to AUTO This causes the HLU to automatically detect the need to switch to the HIGH power feed mode when it receives a request from the HRU to ...

Page 37: ...LU 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 08 15 99 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 DOUB...

Page 38: ...g Figure 11 NLOC Loopback Mode Reported in the Maintenance Terminal Main Menu Disabling a Loopback The Disable Loopbacks option Figure 9 on page 29 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 t...

Page 39: ...ata screen Press to view the next 4 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 388 Span Status screen shown in Figure 5 on page 17 The HLU 388 is considered the master module it clears all performance data scr...

Page 40: ...th span HDU4 to the HRU Invalid report entries are indicated by dashes Figure 13 Performance Data Screen Four Doublers Span 5 Date 08 15 99 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 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 Da...

Page 41: ...press Previous for the previous screen Press to exit from the Performance History screen Performance History Screen without Doubler Figure 14 shows a non doubler application Invalid report entries are indicated by dashes Figure 14 31 Day Performance History Screen No Doubler All Performance History counters can be set to zero by pressing clear from the HLU 388 Span Status screen shown in Figure 5 ...

Page 42: ...lid report entries are indicated by dashes 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 00...

Page 43: ...ptions These descriptions apply to the Alarm History for doubler applications as well Table 12 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 ...

Page 44: ...4 DATE 08 15 99 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 99 00 00 02 01 99 00 00 OK 001 SPAN1 LOSW HDSL2 02 01 99 00 00 02 01 99 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 13 59 20 DATE 08 15 99 CIRCUIT ID Type First Last C...

Page 45: ...er is lost The System Inventory screen displays HiGain unit serial numbers For HLU 388 List 5A units manufactured prior to August 5 1999 the screen displays only the last six digits of the serial number Those HLUs manufactured after that date display all ten digits The HLU requires no unit ID number since it is usually identified by the Circuit ID number Press at the Maintenance Terminal Main Menu...

Page 46: ...NIT PRODUCT SERIAL NUMBER UNIT ID HLU HLU 388 L5A V7 2 000004 NOT REQUIRED B HRU HRU 402 L1 V1 5 3499000400 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 18 16 37 DATE 08 15 99 A CIRCUIT ID UNIT PRODUCT SERIAL NUMBER UNIT ID HLU HLU 388 L5A V7 2 000004 NOT REQUIRED B HRU HRU 402 L1 V1 5 3499000400 C DB1 HDU 404 L2 V1 2 002311 D DB2 HDU 4...

Page 47: ...e legend describes the type of problem Figure 21 Troubleshooting Screen Describing Circuit Problem TIME 17 34 31 TROUBLESHOOTING DATE 08 15 99 CIRCUIT ID ___ ___ ___ ___ ___ ___ 1 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 H elp L oopbacks HDSL Line 1 Doubler 4 HDSL LIne 2 Signal Direction TIME 01 36 29 TROU...

Page 48: ...ggle keys to enter or exit the respective troubleshooting screen Press to return back to the Maintenance Terminal Main Menu Press to return back to the main Troubleshooting screen from the Help Margin Values or Insertion Loss screens Press to update a screen Press to automatically update the screen Press again to deactivate auto update The Troubleshooting screen indicates whether AutoUpdate is on ...

Page 49: ...gin 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 L oopbacks TIME 01 34 56 TROUBLESHOOTING with INSERTION LOSS VALUES DATE 08 15 99 CIRCUIT ID ___ ___ ___ ___ ___ ___ 01 00 00 01 00 00 00 00 00 01 ___ 01 00 ___ 00 01 ___ 00 00 ___ 00 00 _...

Page 50: ...DSL CRC error has occurred An ERR symbol on the graph indicates a DS1 error has occurred The maximum value can be displayed is 999 Some causes of HDSL errors Shorts interference noise Some causes of DS1 errors Bipolar Violation Framing error CRC error AUTOUPDATE OFF E xit A uto U pdate B ack L oopbacks 1 2 TIME 01 35 12 TROUBLESHOOTING with 24 HOUR UAS DATE 08 15 99 CIRCUIT ID ___ ___ ___ ___ ___ ...

Page 51: ...U 388 enters a self test cycling mode the front panel LED lights yellow instead of red and the SELF TEST message displays instead of the ALRM message One of the HDSL loops has lost synchronization Cannot be inhibited ALRM LLOS Local Loss 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 The front panel Status LED flashes r...

Page 52: ...tem alarm press the SEL button and execute an Alarm Cut Off 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...

Page 53: ...ected 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 loopup condition can b...

Page 54: ...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 SmartJack Loopdown or NID payloa...

Page 55: ...elephone 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 powerdown four loopback time out choices initiation from either end repeating bit error signatures alternate query loopback...

Page 56: ...ss 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 using the MODE and SEL buttons When executing a manual l...

Page 57: ...t to the correct distance range see Table 9 on page 23 All equalizers should be set to the distance from the DSX 1 to the shelf GNLB Test Procedures Figure 28 on page 50 is a graphical representation of the various generic loopback configurations with the associated GNLB commands shown See Table 14 on page 46 for a description of these commands To perform the GNLB loopback test procedure 1 Have th...

Page 58: ...HLU HLU HLU HRU 412 4 in 7 HRU 412 5 IN 7 CLOC HRU 412 HRU 412 5 IN 7 CLOC HRU 412 HRU 412 5 IN 7 CLOC HRU 412 HRU 412 5 in 7 CLOC All ones HLU HLU HLU HLU HLU HLU HLU HLU HLU HLU HLU HLU HLU HLU HLU HLU HLU 1111000 NLOC HRU 412 HDSL SPAN HLU HLU HLU HRU 412 HRU 412 1110000 3 in 7 NREM HRU 412 HRU 412 HRU 412 HRU 412 HDSL SPAN HDSL SPAN HLU HLU HLU HLU HLU HLU HRU 412 HRU 412 HRU 412 HRU 412 HRU 4...

Page 59: ...errors 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 error...

Page 60: ...as 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 time ou...

Page 61: ...ped 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 termination manual 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 se...

Page 62: ...ion Binary 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 388 loopup from NI 1111 1111 0001 1110 FF1E CREM HLU 388 loopup from CI 0011 1111 0001 1110 3F1E NDU1 HDU double...

Page 63: ... Ω DSX 1 Pulse Output 6 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 56 Fusing Internal connected to Fuse Alarm output on pin 117 HDSL Span Voltage 140 or 112 Vdc Electrical Protection Secondary surge and po...

Page 64: ... Table 18 describes line powered circuits on 9 kft 26 AWG loops without a doubler Table 17 HDSL Loss Over Cables Cable Gauge Loop Loss a dB kft a At 196 kHz 68 F 20 C Loop Resistance Ω kft 26 AWG 0 4 3 88 83 24 AWG 0 51 2 84 52 22 AWG 0 61 2 18 32 19 AWG 0 91 1 54 16 A Windows based program Cable Calculator may be downloaded from the Customer Site portion of the PairGain Web site at www pairgain c...

Page 65: ...1 6 3 6 9 494 543 HRU 411 OFF 20 22 0 6 2 6 8 471 518 Table 20 HLU 388 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 21 4 23 5 7 8 8 5 502 552 HRU 412 Lis...

Page 66: ...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 HRU 411 OFF 27 7 30 5 7 5 8 3 652 717 Table 24 HLU 388 Power Parameters Two Doublers HDU 409 List 2 HDU 407 List 2 and HDU 404 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 Maxim...

Page 67: ...lt CEV or other enclosures 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 388 consumes or draws from the shelf power source This parameter is needed when the HLU 388 is in a location remote to the CO it is serving It determines the battery capacity required to mainta...

Page 68: ...agement the MNGD message displays periodically on the HLU 388 List 5A front panel display Fuse Alarm Pin 117 on the card edge connector is a Fuse Alarm that is driven to 48 Vdc through a 1000 Ω resistor when the onboard fuse opens Some features of the HLU 388 List 5A are affected when it is under management Consult the management unit practice for further information 106 105 104 103 102 101 100 DS...

Page 69: ...aft port connector and its connection to a DB 9 or DB 25 connector on a maintenance terminal Figure 30 RS 232 Craft Port Pinouts HLU 388 Female DB9 210 adapter supplied with each unit DB 9 connector DCE RD Receive Data TD Transmit Data 2 Ring 210 jack Tip Sleeve 3 5 DB 9 connector DTE DB 25 connector DTE Terminal Terminal 3 2 5 3 2 7 GND ...

Page 70: ...rily defines a frame bit Figure 31 HLU 388 List 5A Block Diagram TIMING The low loop wander 0 3 UI max of an HLU 388 List 5A when used with compatible doublers HDU 409 HDU 404 or HDU 407 and remote units HRU 402 or HRU 411 allows the circuit to be used in all critical timing applications including those that are used to transport Stratum 1 timing GROUND FAULT DETECT The HLU 388 has a Ground Fault ...

Page 71: ...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 later as part of a new start up procedure If the ground condition persists on the span the power is removed again once the GFD circuit detects the grounded loop The indication of the location of the ground fault can be obtained by monito...

Page 72: ...Gain 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 o...

Page 73: ...st 3 3B 4 4B HDU 437 439 HDU 404 407 409 Line Powered Local Powered Line 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 Ω maximum loop resistance ...

Page 74: ...n Doubler Unit CDI Customer Disconnect Indicator HLU HiGain Line Unit CI Customer Interface HMS HiGain Management Shelf CLEI Common Language Equipment Identifier HMU HiGain Management Unit CLOC Customer Local Loopback HRE HiGain Remote Enclosure CO Central Office HRU HiGain Remote Unit COM Communications I CPE Current amperes requirements for Customer Premises Equipment CPE Customer Premises Equip...

Page 75: ...ess Memory SMJK SmartJack ORB Office Repeater Bay SNR Signal to Noise Ratio PCS Personal Communications System SPLB Special Loopback PL Payload STS Span Terminating Shelf POTS Plain Old Telephone Service TEC Total Error Count PPM Pulse Position Modulation TLOS LB Transmit Loss of Signal Loopback PWRF Power Feed TSEC Total System Error Count RCV Receive TSGR Transport System Generic Requirements RD...

Page 76: ...e Customer Site portion of the PairGain Web page at www pairgain com A password is required If you do not have a password contact your PairGain sales representative RETURNS To return equipment to PairGain 1 Locate the number of the purchase order under which the equipment was purchased You will need to provide this number to PairGain s Sales Administration RMA Department to obtain a return authori...

Page 77: ...son for returning the equipment please let us know so we can determine how best to help you 4 Pack the equipment in a shipping carton 5 Write PairGain s address and the Return Material Authorization RMA Number you received from the RMA Department clearly on the outside of the carton and return to PairGain Technologies Inc 14352 Franklin Ave Tustin CA 92780 7013 Attention CRF RMA Number If the equi...

Page 78: ...Appendix E Product Support 150 388 151 01 Revision 01 70 September 15 1999 HLU 388 List 5A ...

Page 79: ...nit If it fails replace it with another unit and return the faulty unit to PairGain for repair Any modifications of the unit by anyone other than an authorized PairGain representative voids the warranty If a unit needs repair call PairGain for a Return Material Authorization RMA number and return the defective unit freight prepaid along with a brief description of the problem to PairGain Technolog...

Page 80: ...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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