PairGain HLU-231 Manual
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PairGain HLU-231 Manual

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Model
HLU-231
E
NGINEERING
H
G
L
I
AIN
INE
List Number
7E
HLU 231
H G
I AIN
HDSL
MODE
SEL
STATUS
BRG
SPAN
D
S
1
BRG
SPAN
L
PairGain
P
G
T
AIR
AIN
ECHNOLOGIES
S
ERVICES
™150-231-175-01T¨
S
150-231-175-01
ECTION
U
NIT
Part Number
150-1111-75
LINE UNIT
MARGIN
dB
XMT
RCV
R
S
2
3
2
, I
.
NC
T
P
ECHNICAL
RACTICE
CLEI Code
T1L2KSXAAA

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Summary of Contents for PairGain HLU-231

  • Page 1 Model List Number Part Number CLEI Code HLU-231 150-1111-75 T1L2KSXAAA HLU 231 LINE UNIT I AIN MARGIN HDSL MODE STATUS SPAN SPAN PairGain ECHNOLOGIES NGINEERING ERVICES ECHNICAL RACTICE ™150-231-175-01T¨ 150-231-175-01 ECTION...
  • Page 2 PairGain and HiGain are registered trademarks of PairGain 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 written consent of PairGain.
  • Page 3 Check the packing list to ensure complete and accurate shipment of each listed item. If the shipment is short or irregular, contact PairGain as described in the Warranty. If you must store the equipment for a prolonged period, store the equipment in its original container.
  • Page 4 Inspecting Shipment 150-231-175-01, Revision 01 September 23, 1998 HLU-231 List 7E...

  • Page 5: Table Of Contents

    Applications without HiGain Doublers ................2 Applications with HiGain Doublers ..................3 Product Description..........................3 Front Panel...........................4 Status LED...........................5 Front Panel Display ......................5 HLU-231 List 7E Card Connector..................7 Network Management Control Bus ..................8 Fuse Alarm ..........................8 System Alarm Relay Output....................8 Installation___________________________________________________________________________ 9 Provisioning the HLU-231 ______________________________________________________________ 9 Setting Options through SEL and MODE..................10...
  • Page 6 Loopback Test Procedures ......................38 Loopback Operation without Doublers ................... 39 Loopback Operation with Doublers ....................39 GNLB Loopback Test Procedures....................41 A1LB, A2LB, and A5LB Test Procedures ............... 41 A3LB and A4LB Test Procedures ..................44 September 23, 1998 HLU-231 List 7E...
  • Page 7 T1 Repeater Shelves and Related Equipment ..................53 HiGain Doubler Circuit Deployment ....................53 Appendix E - Product Support _________________________________________________________ 55 Technical Support ..........................55 Warranty............................55 FCC Compliance..........................56 Modifications ...........................56 Standards Compliance........................56 Barcode and Configuration Number Information ................57 HLU-231 List 7E September 23, 1998...
  • Page 8 IGURES Figure 1. HLU-231 List 7E Front Panel ......................4 Figure 2. HLU-231 List 7E Card-Edge Connector..................7 Figure 3. Installing the HLU-231 into a Shelf ....................9 Figure 4. DB-9 RS-232 I/O Pinouts....................... 12 Figure 5. System Spans..........................13 Figure 6.
  • Page 9 Table 15. Addressable 3 and 4 (A3LB and A4LB) Repeater Loopback Commands........45 Table 16. HLU-231 List 7E Power Parameters with HDU-451 Doublers, List 1, 2, 3, & 4, and M/M..52 Table 17. HLU-231 List 7E/HDU-451 List 1, 2, & 3 Deployment Guidelines ..........52 Table 18.
  • Page 10 List of Tables 150-231-175-01, Revision 01 September 23, 1998 HLU-231 List 7E...

  • Page 11: Overview

    The PairGain HiGain HLU-231 List 7E is the Central Office (CO) side of a repeaterless, T1 transmission system. When used in conjunction with a remote unit or HRU, the system provides 1.544 Mbps transmission on two unconditioned copper pairs over the full Carrier Service Area (CSA) range. This line unit can be used in applications with or without HDUs.

  • Page 12: Applications

    Applications without HiGain Doublers This section addresses HLU-231 List 7E operation when used without doublers. For applications without doublers, the HLU-231 is directly connected to the HRU by the two HDSL cable pairs. The HLU-231 is compatible with all HiGain HRUs.

  • Page 13: Applications With Higain Doublers

    The HLU-231 can line power one doubler and the remote unit for a total of two spans. If the remote unit is locally powered, the HLU-231 can power up to two doublers for a total of three spans. The HLU-231, List 7E has been enhanced over the older HiGain line units so that it can line power two doublers and the remote unit (three spans).

  • Page 14: Front Panel

    Overview 150-231-175-01, Revision 01 Front Panel The HLU-231 List 7E front panel is shown is Figure 1. The front panel components are described in Table 2 on page Figure 1. HLU-231 List 7E Front Panel September 23, 1998 HLU-231 List 7E...

  • Page 15: Status Led

    The front panel display turns on when power is initially applied to the HLU-231. To conserve power, the display only remains on for 4 minutes. The use of the MODE or SEL buttons activates the front panel display and restarts the 4-minute, power-control timer.

  • Page 16: Table 4. Front Panel Display Messages

    System Settings review mode defined above. CODE Line Code: AMI, B8ZS This is the line code that HLU-231 List 7E is receiving at its DSX-1 interface. Displayed during System Setting review mode defined above. LOSW Loss of Sync Word Indicates that 1 of the HDSL loops has lost sync.

  • Page 17: Hlu-231 List 7E Card Connector

    The margin on HDSL loop 1 (2) has dropped below the threshold (1 to 15 dB) set by the user. HLU-231 List 7E Card Connector Figure 2 shows the card-edge connectors on the HLU-231. Active pins are highlighted in black. Figure 2. HLU-231 List 7E Card-Edge Connector HLU-231 List 7E September 23, 1998...

  • Page 18: Network Management Control Bus

    150-231-175-01, Revision 01 Network Management Control Bus The HLU-231 List 7E provides a Network Management Control Bus on pin 46 of the card-edge connector. This allows the various PairGain Management System protocols to manage the HLU through the HMU-319 HiGain Management Unit.

  • Page 19: Installation

    Installation NSTALLATION To install the HLU-231: Slide the HLU-231 into the card guides for the desired slot, then push the unit back until it touches the backplane card-edge connector and the retaining latch on the front panel opens (Figure Figure 3. Installing the HLU-231 into a Shelf Place your thumbs on the HLU-231 front panel and push the HLU-231 into the card-edge connector until it is entirely within the card guides and the retaining latch closes.

  • Page 20: Setting Options Through Sel And Mode

    ETTING PTIONS THROUGH To provision the HLU-231 through the MODE and SEL buttons on the front panel: Press the MODE button and release it after 1 second. The message displayed on the front panel alternates between the first system parameter and its current setting.

  • Page 21: Displaying System Inventory

    AINTENANCE ERMINAL The 9-pin, RS-232 Craft port on the front panel allows you to connect the HLU-231 to a maintenance terminal (ASCII terminal or PC running a terminal emulation program). Once connected to a maintenance terminal, you can access the maintenance, provisioning, and performance screens.

  • Page 22: Maintenance

    As shown in Figure 5, the HLU can support up to two doublers with three HDSL spans. The Span Status, Performance Data, and Performance History may display as many as three screens to describe HLU-231 system status. September 23, 1998...

  • Page 23: Navigation Keys

    > error This happens only for Margin Alarm Threshold or DS0 blocking. NITIALIZING THE AINTENANCE ERMINAL CREENS  Press the several times to initiate the autobaud connection and to initialize the Maintenance Terminal screens. HLU-231 List 7E September 23, 1998...

  • Page 24: Maintenance Terminal Main Menu

    Figure 6 shows the Maintenance Terminal Main Menu from which you can access eight system administration screens. The function of each screen selection is listed in Table HI-GAIN HLU-231 MAINTENANCE TERMINAL MAIN MENU (ver V5.4L-7E) CIRCUIT ID#: A. VIEW SPAN STATUS B.

  • Page 25: View Span Status

    00002 00001 seconds DS1 STATUS 24 HOUR BPV Seconds: 00000 00000 24 HOUR UAS Count: 00000 00000 Frame type: Code type: B8ZS B8ZS (E)xit (C)lear (U)pdate (S)pa Figure 7. Span Status Screen (No Doubler) HLU-231 List 7E September 23, 1998...

  • Page 26: Figure 8. Span 1 Status Screen

    00000 00000 00000 seconds DS1 STATUS 24 HOUR BPV Seconds: 00000 00000 24 HOUR UAS Count: 00000 00000 Frame type: Code type: B8ZS B8ZS (E)xit (C)lear (U)pdate (S)pan Figure 9. Span 2 Status Screen September 23, 1998 HLU-231 List 7E...

  • Page 27: Span Status Fields, Alarms, And Loopbacks

    HiGain is set to its ZBTS1 mode. In either the AMI or B8ZS DS1 code mode, it displays the selected code as opposed to the code type that is actually being received. HLU-231 List 7E September 23, 1998...

  • Page 28: Table 8. Hlu-231 Status Menu Messages

    H2ES HDSL Loop 2 Errored Second Loop 2 CRC have exceeded the ES threshold. Digital Service 1 BPVs for either the HLU-231 List 7E or HRU DS1 input have exceeded the user selected ES threshold. R(L)AIS Remote (Local) Alarm Indicating Indicates an AIS (all “1”) pattern is being transmitted from the remote...

  • Page 29: Set Clock

    Full Name Description CDU 2 Customer Doubler 2 Loopback Loopback at Doubler 2 towards CI initiated by ILR code, HLU-231 front panel MANUAL LOOPBACK push-buttons, or maintenance terminal (Figure 15). Armed The HiGain system has detected the IR loopback (2 in 5) arming code.

  • Page 30: Set Date

    ETTINGS The options set from the System Settings screen are the same as the options set through the HLU-231 front panel Mode and SEL buttons (except for Margin Alarm Threshold and DS0 Blocking, which can only be set at this screen).

  • Page 31: Ds0 Blocking Option

    If DS0 blocking is invoked in a HiGain system that has an earlier version HRU that does not support the blocking option, blocking only occurs at the DSX-1 output of the HLU-231. The HRU DS1 output will not be blocked.

  • Page 32: Margin Alarm Threshold

    HDSL Line Voltage Operation A unique feature of the HLU-231 List 7E is that its 200 V output voltage for doubler applications is always bipolar. This bipolar voltage is required to support the Ground Fault Detection (GFD) circuit, which is also unique to the HLU-231 List 7E.

  • Page 33: Ground Fault Detect

    The GFD circuit immediately detects ground faults that occur at any point along any span on any conductor, and shuts down the HiGain circuit. The HLU-231 then applies power periodically to the first span to detect the ground fault condition. This power cycling and ground fault protection continues as long as the fault condition exists.
  • Page 34 HAIS 2LP* Causes the HiGain system to transmit the AIS signal at both the HLU-231 and HRU T1 output ports when both of the HDSL loops are not in sync (LOSW). Causes the HiGain system to transmit the AIS signal at both the HLU-231 and HRU T1 output ports when either of the two HDSL loops is not in sync (LOSW) or if a Margin alarm occurs.

  • Page 35: Loopback Menu

    150-231-175-01, Revision 01 Maintenance Table 9. HLU-231 List 7E System Settings Screen Options (Cont.) Front Panel System Settings Display Selection Description Screen Options Code 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 (see Figure 5).

  • Page 36: Loopback Menu: No Doubler

    F. NETWORK LOOP DOUBLER 2 (NDU2) G. CUSTOMER LOOP HLU (CREM) H. CUSTOMER LOOP HRU (CLOC) I. CUSTOMER LOOP DOUBLER 1 (CDU1) J. CUSTOMER LOOP DOUBLER 2 (CDU2) (E)xit Figure 13. Loopback Menu with Two Doublers September 23, 1998 HLU-231 List 7E...

  • Page 37: Initiating A Loopback

    NLOC loopback is in progress). The loopback continues to cycle in the system depending upon your Loopback Timeout setting. The Loopback Menu screen is also available at the HRU connected to the HLU-231, thus allowing all HiGain System loopbacks to be initiated from either end of the circuit.

  • Page 38: Performance Data Screens

    (Clear) from the HLU-231 Span Status screen shown below. Since the HLU-231 is considered the master module, this clears all performance data screens at both the HLU-231 and the HRU. The RS-232 interface at the HRU does not allow the counters to be cleared.

  • Page 39: Performance Data Screen: No Doubler

    Maintenance Terminal Main Menu to view the Performance Data screen for applications (Figure 15) without a doubler. This screen shows the Errored and Unavailable Seconds for the HDSL span between the HLU-231 and the HRU. Date: 02/02/98 PERFORMANCE DATA...

  • Page 40: View Performance History

    (Clear). Since the HLU-231 is considered the master module, this clears all performance data screens at both the HLU-231 and the HRU. The RS-232 terminal interface at the HRU does not allow the counters to be cleared. September 23, 1998...

  • Page 41: The 7 Day History Screen: No Doubler

    (View Performance History) from the Maintenance Terminal Main Menu to open the 7 Day History screen for applications (Figure 17) without a doubler. The 7 Day History Span 1 screen shows the ES and UAS for the HDSL loop between the HLU-231 and the HRU. Time: 00:16:55 7 DAY HISTORY CIRCUIT ID#:...

  • Page 42: View Alarm History

    From each Alarm History screen you can do the following: • Press to update the screen. • Press to view another span. • Press to clear all data from the screen. • Press to exit from the Alarm History screen. September 23, 1998 HLU-231 List 7E...

  • Page 43: Alarm History Screen: No Doubler

    SPAN1 LOSW, HDSL1 SPAN1 LOSW, HDSL2 SPAN1 ES, HDSL1 SPAN1 ES, HDSL2 SPAN1 MARGIN L1 SPAN1 MARGIN L2 PWR-OPEN PWR-SHRT LAST CLEARED: NONE (E)xit (C)lear (U)pdate (S)pan Figure 19. Alarm History Screen for Span 1 HLU-231 List 7E September 23, 1998...

  • Page 44: Alarm History Screen: With Doubler

    Type a unique identifier for the circuit, up to 24 characters, then press . If you type more than 24 characters, a warning beep sounds, and only the first 24 characters are accepted. Choose to confirm. September 23, 1998 HLU-231 List 7E...

  • Page 45: System Alarms

    Loop2 a When both HDSL loops lose sync word (LOSW), a system alarm condition exists. However, since the HLU-231 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.

  • Page 46: Self Test

    150-231-175-01, Revision 01 When both HDSL loops lose sync word (LOSW), a minor alarm condition exists. Because the HLU-231 List 7E enters a self test cycling mode, the front panel LED lights yellow instead of red and the “SELF TEST” message is displayed instead of the “ALRM”...

  • Page 47: Addressable Repeater Loopback Functions

    A5LB (Teltrend Mod 1) = Southern New England Telephone (SNET) A5LB differs from A2LB in that A5LB does not block the arming code from exiting the HLU-231 into the network. A2LB can be configured to either block this arming code after two seconds, and replace it with the AIS code, or to unblock it by executing the FAR-END ACTIVATE code.

  • Page 48: Loopback Test Procedures

    DS1 channels to the customer and the local DSX-1 interface. If trouble is encountered on the HLU-231 DSX-1 interface, verify that the HLU is making a positive connection with its mounting assembly (shelf) connector. Also, verify that the HLU internal equalizer is set to the correct distance range.

  • Page 49: Loopback Operation Without Doublers

    21. The loopbacks can be initiated from the HLU RS-232 Craft port, the HLU front-panel MODE and SEL buttons, or from a family of Special Loopback (SPLP) in-band loopback commands. Figure 21. HLU-231 Non-Doubler Loopback Configurations OOPBACK PERATION WITH OUBLERS...

  • Page 50: Figure 22. Doubler Loopback Configurations

    Loopback Command NDU1 1 1 0 0 0 0 (2-in-6) NDU2 1 1 1 0 0 0 (3-in-6) CDU1 1 1 1 1 0 0 (4-in-6) CDU2 1 1 1 1 1 0 (5-in-6) September 23, 1998 HLU-231 List 7E...

  • Page 51: Gnlb Loopback Test Procedures

    LOOP LED on the front panel and also display in the Span Status screen.) Have the CO tester transmit a T1 test signal into the HLU-231 and verify that the returned (looped) signal is error-free.
  • Page 52 If the Time-out Override code 1101 0101 1101 0110 (D5D6) is received, the activation sequence described in step 4, above, is repeated and the automatic timed expiration of the loopback is inhibited. If this Time-out Override is sent, then the only way to loop the HLU-231 down is to: •...
  • Page 53 (if enabled). A customer tester can activate loopbacks CLOC or CREM. All loopbacks shown in Table 14 can also be initiated from the HLU-231 front panel MODE and SEL buttons (see “Setting Options through SEL and MODE” on page 10).

  • Page 54: A3Lb And A4Lb Test Procedures

    16-bit loop-up command before the timer expires. When this time-out override state exists, the only way to loop the HLU-231 down is to issue one of the three loopdown commands listed in Step 2. The automatic time-out mode is restored during subsequent loopback sessions.

  • Page 55: Table 15. Addressable 3 And 4 (A3Lb And A4Lb) Repeater Loopback Commands

    ESF-DL = Extended Super Frame Data Link Information specific to HiGain doublers is shown in bold in Table Table 15. Addressable 3 and 4 (A3LB and A4LB) Repeater Loopback Commands Position Name Code HLU-231 LU FROM NI NLOC 1111(F) 1111(F)0001(1)1110(E) HLU-231 LU from CI CREM 0011(3)1111(F)0001(1)1110(E)

  • Page 56: Appendix A - Technical Specifications

    Operating Temperature -40° to +65° Celsius, 5 to 95% (non-condensing) and Humidity Mounting AT&T 220-configuration or equivalent. Dimensions Height: 5.9” (15 cm) Width: 1.4” (3.5 cm) Depth: 10” (25.4 cm) Weight 1 lb. 14 oz. September 23, 1998 HLU-231 List 7E...

  • Page 57: Appendixb - Abbreviations

    Extended SuperFrame Data Link ESF DL High Capacity Digital Service HCDS High-bit-rate Digital Subscriber Lines HDSL HiGain Doubler Unit HiGain Line Unit HiGain Remote Enclosure HiGain Remote Unit Interface-Customer Premises Equipment I-CPE Loss of Signal HLU-231 List 7E September 23, 1998...
  • Page 58 Plain Old Telephone Service POTS SmartJack AIS SAIS Super Frame Signal-to-Noise Ratio Special Loopback SPLB Span Terminating Shelf Transmit Loss of Signal-Loopback TLOS-LB Transport System Generic Requirements TSGR Unavailable Seconds Underwriters Laboratory Zero-Byte Timeslot Interchange ZBTSI September 23, 1998 HLU-231 List 7E...

  • Page 59: Appendix C - Functional Operation

    HRU, which comprise one HiGain system. HiGain systems use PairGain 2-Binary 1, Quartenary (2B1Q) HDSL transceiver systems to establish two, full-duplex, 784 kbps data channels between the HLU-231 and a remotely located HDU or HRU. This provides a total capacity of 1.568 Mbps between the two units.

  • Page 60: Power Consumption

    134.7 Watts/sq. ft. per Section 4.2.3 of the NEBS GR-63-CORE. The footprint of a standard 28-slot 23-inch HLU-231 shelf is 7.024 sq. ft. Thus, the maximum bay dissipation is limited to 946 Watts. At 7 Watts per slot, this limits the number of occupied slots to 135 per bay. The thermal loading limitations, imposed when using the HLU-231 in a Controlled Environmental Vault (CEV) or other enclosures, are determined by applying the HLU-231 power parameters to the manufacturer's requirements for each specific housing.

  • Page 61: Power Consumption: With Doublers

    The maximum current drain is the current drawn from the shelf power supply when it is at minimum voltage (-42.5 VDC) under a worst case application. The worst case application for the HLU-231 List 7E occurs on a loop with one HDU doubler, four 9000 ft, #26 AWG spans, and an HRU-412 that is providing 60 mA of CPE current.

  • Page 62: Table 16. Hlu-231 List 7E Power Parameters With Hdu-451 Doublers, List 1, 2, 3, & 4, And M/M

    The power consumption listed in Table 12 is the total power that the HLU-231 List 7E consumes or draws from its -48 VDC shelf power source. This parameter is needed when the HLU-231 List 7E is located remote to its serving CO.

  • Page 63: Appendixd - Compatibility

    D - C PPENDIX OMPATIBILITY T1 R EPEATER HELVES AND ELATED QUIPMENT The HLU-231 List 7E is compatible with the following T1 repeater shelves and associated equipment: • PairGain HMG-317 (28-slot, 23-inch shelf) • PairGain LS-417 (23”) • PairGain HCS-418 (19”) •...

  • Page 64: Table 18. Higain Doubler Deployment Matrix

    HDU-451, HDU-437 and HDU-439 are limited to applications with one and two doublers only. b 2000 ohm maximum loop resistance. Requires HRU-412 List 7A or 8A, or HUR-402 or HUR 411. c Requires HRU-402 or 411. d Requires HRU-402. September 23, 1998 HLU-231 List 7E...

  • Page 65: Appendixe - Product Support

    Do not try to repair the unit. 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.

  • Page 66: Fcc Compliance

    All wiring external to the products should follow the provisions of the current edition of the National Electrical Code. TANDARDS OMPLIANCE The HLU-231 List 7E has been tested and verified to comply with the applicable sections of the following standards. • GR-63-CORE - Network Equipment-Building System (NEBS) Requirements •...

  • Page 67: Barcode And Configuration Number Information

    ARCODE AND ONFIGURATION UMBER NFORMATION Figure 24 shows the location of the P1 barcode and configuration number label on the HLU-231 List 7E. Table 19 gives a brief description of what each label contains. HLU 231 HiGain LINE UNIT MARGIN...
  • Page 68 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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