PairGain HLU-319 User manual

HIGAIN LINE UNIT
PAIRGAIN TECHNOLOGIES, INC.
ENGINEERING SERVICES TECHNICAL PRACTICE
™150-319-153-01[¨
SECTION 150-319-153-01
Model List Number Part Number CLEI Code
HLU-319 5C 150-1140-53 T1L2B27AAA

Revision History of This Practice 150-319-153-01, Revision 01
ii April 30, 1999 HLU-319 List 5C
REVISION HISTORY OF THIS PRACTICE
USING THIS TECHNICAL PRACTICE
Two types of messages, identified by icons, appear in the text.
If you have comments or questions about this Technical Practice, send email to
[e-mail].
Type the product name and document “section” number in the subject area of the email message.
INSPECTING SHIPMENT
Upon receipt of the equipment:
•Unpack each container and 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 PairGain.
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 PairGain as described in the Warranty. If you must store the equipment for a prolonged
period, store the equipment in its original container.
©Copyright 1999 PairGain Technologies, Inc.
PairGain and HiGain are registered trademarks of PairGain Technologies, Inc.
Information contained in this document is company private toPairGain Technologies, Inc., and shall not be modified, used, copied,
reproduced or disclosed in whole or in part without the written consent of PairGain.
Other product names mentioned in this practice are used for identification purposes only and may be trademarks or registered
trademarks of their respective companies.
Revision Release Date Revisions Made
01 April 30, 1999 Initial release
Notes contain information about special circumstances.
Cautions indicate the possibility of equipment damage or the possibility of personal injury.
When installing anHLU in a chassis, besure to wear anantistatic wrist strap. Avoid touching
components on the circuit board.

150-319-153-01, Revision 01 Table of Contents
HLU-319 List 5C April 30, 1999 iii
TABLE OF CONTENTS
Overview ____________________________________________________________________________ 1
Product Enhancements.......................................................................................................................1
Standard Features...............................................................................................................................2
Compatibility .....................................................................................................................................2
Applications .......................................................................................................................................2
Applications without HiGain Doublers...............................................................................2
Applications with HiGain Doublers ....................................................................................3
PCS Applications.................................................................................................................3
Front Panel __________________________________________________________________________ 4
Installation___________________________________________________________________________ 6
Provisioning__________________________________________________________________________ 7
Navigating the Maintenance Terminal Screens .................................................................................7
System Spans.......................................................................................................................7
Navigation Keys ..................................................................................................................7
Selecting an Option .............................................................................................................8
Accessing the Maintenance Terminal Screens...................................................................................8
View Span Status .............................................................................................................................10
Span Status Screen for Non-doubler Applications............................................................10
Span Status Screen for Doubler Applications ...................................................................11
Set Clock..........................................................................................................................................14
Set Time.............................................................................................................................14
Set Date..............................................................................................................................14
Update the HRU Time and Date........................................................................................14
System Settings................................................................................................................................15
BPV and BER Options ......................................................................................................18
DS0 Blocking Option ........................................................................................................19
DS1 Line Code Option......................................................................................................19
Margin Alarm Threshold...................................................................................................19
HAIS Selections ................................................................................................................20
HDSL Line Voltage Options.............................................................................................20
Ground Fault Detect ..........................................................................................................21
Loopback Menu Screen ...................................................................................................................21
Loopback Menu for Non-doubler Applications ................................................................21
Loopback Menu for Doubler Applications........................................................................22
Initiating a Loopback.........................................................................................................23
Disable Loopbacks ............................................................................................................23

Table of Contents 150-319-153-01, Revision 01
iv April 30, 1999 HLU-319 List 5C
Performance Data Screens............................................................................................................... 24
Performance Data Screen for Non-doubler Applications................................................. 25
Performance Data Screen for Doubler Applications......................................................... 25
View Performance History.............................................................................................................. 26
Performance History for Non-doubler Applications......................................................... 26
Performance History for Doubler Applications................................................................ 27
View Alarm History Screens........................................................................................................... 28
Alarm History Screen for Non-doubler Applications....................................................... 29
Alarm History Screen for Doubler Applications .............................................................. 30
System Inventory Screen................................................................................................................. 31
Troubleshooting _____________________________________________________________________ 32
System Alarms................................................................................................................................. 32
Loopback Operation........................................................................................................................ 33
Generic Loopback Code (GNLB)..................................................................................... 33
Addressable Repeater Loopback Functions...................................................................... 33
Loopback Test Procedures................................................................................................ 34
Loopback Operation.......................................................................................................... 35
GNLB Loopback Test Procedures.................................................................................... 36
Appendix A - Specifications____________________________________________________________ 42
HDSL Insertion Loss Guidelines..................................................................................................... 43
Power Consumption ........................................................................................................................ 43
Power Consumption without Doublers............................................................................. 43
Power Consumption with Doublers.................................................................................. 44
Maximum Power Dissipation.......................................................................................................... 47
Maximum Current Drain................................................................................................................. 47
HLU-319 Card Connector............................................................................................................... 48
Network Management Control Bus .................................................................................. 48
Fuse Alarm........................................................................................................................ 48
System Alarm Output Pin................................................................................................. 49
Appendix B - Functional Operation _____________________________________________________ 50
Functional Description .................................................................................................................... 50
Timing ............................................................................................................................................. 50
Appendix C - Compatibility____________________________________________________________ 51
Appendix D - Product Support _________________________________________________________ 53
BBS.................................................................................................................................................. 53
World Wide Web............................................................................................................................. 53
Documentation ................................................................................................................................ 53
Returns............................................................................................................................................. 54
Appendix E - Glossary ________________________________________________________________ 55
Certification and Warranty______________________________________________ Inside Back Cover

150-319-153-01, Revision 01 List of Figures
HLU-319 List 5C April 30, 1999 v
LIST OF FIGURES
Figure 1. HLU-319 Front Panel........................................................................................................................4
Figure 2. Installing the HLU-319 into a Shelf..................................................................................................6
Figure 3. System Spans....................................................................................................................................7
Figure 4. Maintenance Terminal Main Menu...................................................................................................8
Figure 5. Span Status Screen (No Doubler) ...................................................................................................10
Figure 6. Span 1 Status Screen.......................................................................................................................11
Figure 7. Set Clock Screen.............................................................................................................................14
Figure 8. System Settings Screen...................................................................................................................15
Figure 9. Loopback Menu: No Doubler.........................................................................................................21
Figure 10. Loopback Menu: Four Doublers...................................................................................................22
Figure 11. NLOC Loopback Mode in the Maintenance Terminal Main Menu .............................................23
Figure 12. Performance Data Screen: No Doublers.......................................................................................25
Figure 13. Span 5 Performance Data Screen..................................................................................................25
Figure 14. Performance History Screen: No Doubler....................................................................................26
Figure 15. Performance History Screen: Four Doublers (Span 5) .................................................................27
Figure 16. Alarm History Screen: No Doubler ..............................................................................................29
Figure 17. Alarm History Screen for Span 5..................................................................................................30
Figure 18. System Inventory Screen ..............................................................................................................31
Figure 19. Doubler Loopback Configurations................................................................................................35
Figure 20. HLU-319 Card-Edge Connector...................................................................................................48
Figure 21. HLU-319 Block Diagram..............................................................................................................50

List of Tables 150-319-153-01, Revision 01
vi April 30, 1999 HLU-319 List 5C
LIST OF TABLES
Table 1. Front Panel Description..................................................................................................................... 5
Table 2. Navigational Keys on the Maintenance Terminal ............................................................................. 7
Table 3. Maintenance Terminal Screens.......................................................................................................... 9
Table 4. Span Status Fields and Descriptions................................................................................................ 12
Table 5. Status Menu Messages: Alarms....................................................................................................... 13
Table 6. HLU-319 System Settings Screen Options...................................................................................... 16
Table 7. Errored and Unavailable Seconds Definitions................................................................................. 24
Table 8. Alarm History Fields and Descriptions ........................................................................................... 28
Table 9. HDSL System Alarms ..................................................................................................................... 32
Table 10. SPLB Loopback Command Set..................................................................................................... 36
Table 11. Addressable 1, 2, 5 (A1LB, A2LB, A5LB) Repeater Loopback Commands................................ 39
Table 12. Addressable 3 and 4 (A3LB and A4LB) Repeater Loopback Commands.................................... 41
Table 13. HDSL Loss Over Cables ............................................................................................................... 43
Table 14. Power Parameters: No Doubler..................................................................................................... 43
Table 15. Power Parameters: Single Doubler with HDU-451 List 1 or 2..................................................... 44
Table 16. Power Parameters: Single Doubler with HDU-439 or HDU-437 Lists 1 and 1B ......................... 44
Table 17. Power Parameters: Single Doubler with HDU-409 List 2............................................................. 45
Table 18. Power Parameters: Two Doublers with HDU-451 List 3, 4, 3B or 4B ......................................... 45
Table 19. Power Parameters: Two Doublers with HDU-439 or HDU-437 Lists 1 and 1B........................... 45
Table 20. Power Parameters: Two Doublers with HDU-409 List 2.............................................................. 46
Table 21. Power Parameters: Three and Four Doublers with HDU-409 List 2............................................. 46
Table 22. HiGain Doubler Deployment Matrix............................................................................................. 52

150-319-153-01, Revision 01 Overview
HLU-319 List 5C April 30, 1999 1
OVERVIEW
The PairGain®HiGain®HLU-319 List 5C is the Central Office (CO) side of a repeaterless, T1 transmission
system. When used in conjunction with a HiGain Remote Unit (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. To provision and view status, use the HiGain Management Unit
(HMU-319).
The CSA includes loops up to 12,000 feet of 24 AWG or 9,000 feet of 26 AWG wire, including bridged taps. The
HiGain system uses HDSL transmission technology as recommended by Bellcore TA-TSY-001210. The HiGain
system complies with GR-63-CORE, TR-TSY-000499, and GR-1089-CORE.
PRODUCT ENHANCEMENTS
New features of the HLU-319 include:
•Five-span range with four doublers (60 kft, 24 AWG)
•Four line-powered spans (three doublers and a remote)
•Low line-power option (135 V) for circuits with a single doubler
•Reduced power consumption
•Ultra-low wander (Stratum 1 compliant)
•Selectable Power Feed (PWRF) modes: AUTO, HIGH and LOW
•HDSL grounded loop detection
•BPV transparency options
•BER alarm options
•HRU Loopback screen
•Inventory Screen (displays Circuit ID and model number)
•LOS/AIS (Alarm Indicating Signal) payload alarm option (ALMP)
•RLOS ALARM disable option (RDA)
•Supports HRU-411 in PCS applications
•Improved performance for AUTO DS1 line code mode
•Default setting screen option
•Payload (PL) or HiGain (HG) loopback source ID

Overview 150-319-153-01, Revision 01
2 April 30, 1999 HLU-319 List 5C
STANDARD FEATURES
•Selectable DS1 pre-equalizer
•DS1 splitting and bridge access
•Status LED
•Compatible with Span Terminating Shelf (STS) high-density shelves
•Selectable loopback activation codes
•Network Management and Administration (NMA) interface
•Lightning and power cross protection on HDSL interfaces
•Full duplex 2B1Q HDSL transmission on two pairs at 784 kbps
•Margin threshold alarm
COMPATIBILITY
For a list of compatible T1 repeater shelves, see “Appendix C - Compatibility” on page 51.
All generations of HiGain HLU and HRU modules are compatible with each other. To take advantage of the
enhanced features of newer HiGain doublers, refer to Table 22 on page 52.
APPLICATIONS
HiGain systems 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.
HiGain systems can do the following:
•operate with any number of other T1, POTS, Digital Data Service (DDS) or other HiGain systems sharing the
same cable binder group.
•can be used with customers requiring DS1 service on a temporary 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.
Applications without HiGain Doublers
For applications without doublers, the HLU-319 is directly connected to the HRU by the two HDSL cable pairs.
HLU-319 is compatible with all HiGain HRUs.

150-319-153-01, Revision 01 Overview
HLU-319 List 5C April 30, 1999 3
Applications with HiGain Doublers
For doubler applications, one to four doublers may be used in the HDSL loops between the HLU and HRU.
•The HLU-319 can power three doublers and a remote unit (HRU-402 or HRU-411) for a total of four spans.
•If the HRU is locally powered, the HLU can power up to four doublers for a total of five spans.
PCS Applications
The HLU-319 is required for Personnel Communications Systems (PCS) applications that use the
HRU-411. The HRU-411 has an onboard 130 V, 8.5 W power supply that can power the 200 mW PCS remote
radio ports. The Line Unit recognizes the HRU-411 (when the Customer Premises Equipment [CPE] POWER
switch is set to ON) and performsthe following two functions required bythe HRU-411 tobring up the NEC radio
port:
•Increases the HDSL line voltage to its high ± 220 V level with the PWRF option set to AUTO
•Enables HRU-411 to turn on its 130 V radio port supply
These extended ranges are only available when using the HDU-409, HDU-404 or HDU-407
micro-doublers with the HRU-411 or HRU-402. Older doublers (HDU-451, HDU-439 and HDU-437)
cannot be used in circuits with more than two doublers in any line or local power system. For
additional information refer to the respective technical practice
(see “Documentation” on page 53).
For a list of compatible T1 repeater shelves and related equipment, refer to
“Appendix C - Compatibility” on page 51.

Front Panel 150-319-153-01, Revision 01
4 April 30, 1999 HLU-319 List 5C
FRONT PANEL
The HLU-319 front panel is shown is Figure 1. The front panel components are described in Table 1 on page 5.
Figure 1. HLU-319 Front Panel

150-319-153-01, Revision 01 Front Panel
HLU-319 List 5C April 30, 1999 5
Table 1. Front Panel Description
Front Panel Feature Function
Status LED
Green Normal operation
Flashing green HDSL loop acquisition
Red Fuse Alarm
Flashing red System alarm
Yellow Self Test is in process or an HLU-319 Customer Remote Loopback (CREM) or a Network Local
Loopback (NLOC) is in effect.
Flashing yellow HLU-319 is in an Armed state
DSX-1 access jacks
XMT and RCV testing Provides splitting jack access to (XMT) and from (RCV), the HDSL span at the DSX-1 interface.
Breaks the XMT and RCV paths to permit test signal insertion and retrieval.
XMT and RCV bridging Provides non-intrusive bridging jack access to (XMT) and from (RCV) the HDSL span at the DSX-1
interface. Allows the two T1 payloads to be monitored.
CLEI and ECI bar code label
(located on the side of the
unit)
Provides the human-readable Common Language Equipment Identifier (CLEI) code number and
the Equipment Catalog Item (ECI) bar code number.
Configuration Number
(located on the side of the
unit)
Contains either a five-digit or six-digit warranty configuration number or a standalone two or
three-digit configuration number as follows:
•Digit 1 = Last digit of shipment year
•Digits: 2 and 3 = Shipment month
•Digits: 4 and 5 = Configuration number
The configuration number can also be found on a small bar label that also contains the Julian date
code and part number. This gummed label may be attached to the PC board or to the front panel.

Installation 150-319-153-01, Revision 01
6 April 30, 1999 HLU-319 List 5C
INSTALLATION
Figure 2. Installing the HLU-319 into a Shelf
To install the HLU-319:
1Slide the HLU-319 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 2).
2Place your thumbs on the HLU-319 front panel and push the HLU-319 into the card-edge connector until it
is entirely within the card guides and the retaining latch closes. This indicates that the card is properly seated.
Upon receipt of the equipment,visually inspect it for signs ofdamage. If the equipment has been
damaged in transit, immediately report the extent of damage to the transportation company and
to PairGain Technologies, Inc.
When installing an HLU in a chassis,be sure to wear anantistatic wrist strap. Avoid touching
components on the circuit board.

150-319-153-01, Revision 01 Provisioning
HLU-319 List 5C April 30, 1999 7
PROVISIONING
NAVIGATING THE MAINTENANCE TERMINAL SCREENS
The following sections describe how the Maintenance Terminal displays an HLU-319 system with and without
doublers, how to navigate through the maintenance screens, and how to select options.
System Spans
As shown in Figure 3, the HLU can support up to four doublers with five HDSL spans. The Span Status,
Performance Data, and Performance History may display as many six screens to depict an HLU-319 system.
Figure 3. System Spans
Navigation Keys
Table 2 lists keys you can use on the maintenance terminal to navigate within the Maintenance Terminal screens.
Table 2. Navigational Keys on the Maintenance Terminal
Key Function
Updates a report.
Clears a report.
Selects the next Span Status screen, or , , , , or
will access span directly (for doubler applications).
Selects the previous page of a report.
Selects the next page of a report.
Exits the current screen.
HiGain
Doubler
D1
HiGain
Doubler
D2
HiGain
Doubler
D3
HiGain
Doubler
D4
HiGain
Remote
Unit
HiGain
Line Unit
Span 1 Span 2 Span 3 Span 4 Span 5 4 Doublers
Span 1
Span 1
Span 1
Span 1
Span 2
Span 2
Span 2
Span 3
Span 3
Span 4 3 Doublers
2 Doublers
1 Doubler
No Doubler
Central Office
8
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64567 8
3
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Provisioning 150-319-153-01, Revision 01
8 April 30, 1999 HLU-319 List 5C
Selecting an Option
To select an option within the Maintenance Terminal screens, you can:
•Press the key indicated to the left of the selection.
•Press the letter in parenthesis of the parameter to be changed.
An invalid entry produces the following message and identifies the name of a field where the invalid entry
occurred:
> error
This happens only for margin alarm threshold or DSO blocking.
ACCESSING THE MAINTENANCE TERMINAL SCREENS
Figure 4 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 3.
Figure 4. Maintenance Terminal Main Menu
The maintenance terminal screens can not be accessed through the HLU-319 List 5C, as this
model does not provide a craft port. View these maintenance terminal screens through the
HiGain Management Unit (HMU) or OS port located on the rear of the HiGain shelf or WBS-3190.
HI-GAIN HLU-319 MAINTENANCE TERMINAL MAIN MENU (ver V7.0L-5C)
CIRCUIT ID#:
A. VIEW SPAN STATUS
B. SET CLOCK
C. SYSTEM SETTINGS
D. LOOPBACK MODE: NONE
E. VIEW PERFORMANCE DATA
F. VIEW PERFORMANCE HISTORY
G. VIEW ALARM HISTORY
H. VIEW SYSTEM INVENTORY

150-319-153-01, Revision 01 Provisioning
HLU-319 List 5C April 30, 1999 9
Table 3. Maintenance Terminal Screens
Screen Function See page:
View Span Status Provides access to subscreens that allow you to monitor the HDSL
line between the HLU and the HRU.
10
Set Clock Allows you to set both the time and the date parameters at the HLU,
and to update the same settings at the HRU.
14
System Settings Allows you to set all user options. 15
Loopback Mode Provides access to subscreens that allow you to issue and disable
loopbacks from both the network and customer side.
21
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 four-hour time period.
24
View Performance History Provides access to subscreens that allow you to view the ES and UAS
between the HLU and the HRU in 24-hour intervals over a 31-day
period.
26
View Alarm History Provides access to subscreens that allow you to view alarm
conditions between the HLU and the HRU.
28
View System Inventory Allows you to enter a unique circuit ID (up to 24 characters). 31

Provisioning 150-319-153-01, Revision 01
10 April 30, 1999 HLU-319 List 5C
VIEW SPAN STATUS
The View Span Status option allows you to view six system status screens that provide information about the
HDSL Loop 1, HDSL Loop 2, and the DS1. For doubler applications, the available Span Status screens depend
on whether the system includes one, two, three, or four doublers.
From each Span Status screen you can:
•Press to clear the cur (current), min (minimum) and max (maximum) numeric counts.
•Press to update cur (current) values.
•Press to view the next available span (for doubler applications).
•Press to return to the previous screen.
Span Status Screen for Non-doubler Applications
Press from the Maintenance Terminal Main Menu to open the Span Status screen (Figure 5). If no doubler
(HDU) is present, the screen reports span status for the subscriber lines between the HLU and the HRU.
Figure 5. Span Status Screen (No Doubler)
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SPAN STATUS
TIME: 00:14:11
DATE: 04/13/99 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: 21/17/21 20/17/21 21/18/21 20/18/21 dB
PULSE ATTN: 19 19 19 19 dB
INS LOSS: 23 23 23 23 dB
24 HOUR ES: 00002 00004 00005 00007 seconds
24 HOUR UAS: 00016 00013 00002 00001 seconds
DS1 STATUS
HLU HRU
24 HOUR ES Count: 00000 00000
24 HOUR UAS Count: 00000 00000
Frame type: ESF ESF
Code type: B8ZS B8ZS
(E)xit (C)lear (A)uto(U)pdate

150-319-153-01, Revision 01 Provisioning
HLU-319 List 5C April 30, 1999 11
Span Status Screen for Doubler Applications
If doublershave beenadded, statusis also reportedfor these.After pressing to access the Maintenance Terminal
Main Menu, press to navigate through the span status screens. Span Status can have up to six screens,
depending on the number of HDUs. Figure 6 shows status between an HLU and its first doubler (HDU1). If there
is only one doubler, the next screen shows status between HDU1 and the HRU. If there are additional doublers
the Span Status screen will report status on each span.
Figure 6. Span 1 Status Screen
Highlighted text in the Span Status screens (Figure 5 and Figure 6) will change depending on
system configuration.
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6
SPAN 1 STATUS
TIME: 12:06:04
DATE: 04/13/99
ALARMS: NONE
LOOPBACK: OFF
POWER LEVEL: HIGH
HLU HDU1
HDSL-1 HDSL-2 HDSL-1 HDSL-2
cur/min/max cur/min/max cur/min/max cur/min/max
MARGIN: 21/21/21 21/21/21 21/21/21 21/21/21 dB
PULSE ATTN: 19 19 20 19 dB
INS LOSS: 23 23 25 23 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: B8ZS B8ZS
(E)xit (C)lear (A)uto(U)pdate (S)pan(1)(2)(3)(4)(5)
Circuit ID#:

Provisioning 150-319-153-01, Revision 01
12 April 30, 1999 HLU-319 List 5C
Table 4 lists the Span Status fields and descriptions. Table 5 on page 13 lists all possible alarms and their
descriptions.
Table 4. Span Status Fields and Descriptions
Field Description
Time Time of day when Span Status was checked.
Date Date when Span Status was checked.
Circuit ID Shows the user-defined circuit ID.
Alarms Presence or absence of alarm conditions. See Table 9 on page 32.
Loopback Indicates Off condition or identifies specific active loopback. See Table 10 on page 36.
Power Level Indicates the HDSL line voltage in its Low (-140 V) or High (±112 V) state.
Margin Indicates the excess signal-to-noise ratio, at either the HLU or HRU, relative to a 10-7 Bit Error
Ratio. The first value is the current margin, the second is the minimum margin, and the third is the
maximum value. NA means “Not Available.” The minimum and maximum margins are cleared and
updated every time the Span Status screen is cleared and every time the system clock passes
12:00 AM midnight.
Pulse Attenuation (ATTN) Indicates the attenuation of the 2B1Q pulse from the distant end. The value is related to the 196 kHz
loss of the cable pair. The pulse attenuation is a more direct indication of the loop attenuation to
the 2B1Q signal than is the 196 kHz loss. The normal HiGain ATTN operation range is from 0 to
28 dB.
INS Loss Indicates the approximate attenuation of the HDSL loop at 196 kHz. It is generated by multiplying
the pulse attenuation by 1.25.
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 The number of seconds the HDSL loop was out of sync.
24-Hour ES Count The number of errored seconds derived by DS1 BPVs, frame errors, UAS, and ESF CRC errors.
24-Hour UAS Count The number of seconds during which the DS1 input signal was absent (125 or more consecutive
0s) over a 24-hour period.
Frame type Type of DS1 framing used on the input stream (SF or ESF).
Code type Type of DS1 line coding used (AMI, B8ZS, AMI: ZBTSI or B8ZS: ZBTSI). The latter two conditions
indicate the code type that is being received when 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.
(DP) DP = Data Path. The loopback was initiated by a command that was embedded in the T1 data path.
(HG) HG = HiGain. The loopback was initiated by a maintenance terminal loopback command.
The Status Menu displays a four-character code that identifies the signal being transmitted or
received, where the code is one of the following: LLOS, RLOS, LAIS, or RAIS.
RCV (xxxx) - Signal received (xxxx) at the T1 input to either the HLU or HRU.
XMT (xxxx) - Signal transmitted (xxxx) at the T1 output of either the HLU or HRU.

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Table 5. Status Menu Messages: Alarms
Message Full Name Description
LLOS Local Loss of Signal No signal from HLU-319 local T1 input.
RLOS Remote Loss of Signal No signal from HRU T1 input.
LOSW1
LOSW2
Loss of Sync Word 1 or 2 One of the HDSL loops has lost synchronization.
BER Bit Error Rate The total system error count (TSEC) has exceeded the user-selected threshold.
R(L)AIS Remote (Local) Alarm Indicating
Signal
Indicates an AIS (all ones) pattern is being transmitted (XMT) from the remote
(local) T1 output port.
MAL1 Margin Alarm 1 The margin on the HDSL Loop 1 has dropped below the threshold (1 to 15 dB)
set by the user. Setting the threshold to zero inhibits the margin alarm.
MAL2 Margin Alarm 2 The margin on the HDSL Loop 2 has dropped below the threshold (1 to 15 dB)
set by the user. Setting the threshold to zero inhibits the margin alarm.
CHREV-SPx Channels Reversed The Loop 1 and Loop 2 HDSL pairs are reversed. SPx indicates the span with
channel reversed.
SMJK SmartJack Loopback Loopback from HRU to network initiated by (2-in-5) in-band loopback code or
out-of-band ESF data link code.
NREM Network Remote Loopback Loopback at HRU to network initiated from CO (network) by Intelligent Line
Repeater (ILR) #2 code or by the maintenance terminal.
NLOC Network Local Loopback Loopback HLU-319 (local) to network initiated from CO by IOR code or from the
maintenance terminal.
NDU1 Network Doubler 1 Loopback Loopback at Doubler #1 to network initiated by IOR code or by the maintenance
terminal.
NDU2 Network Doubler 2 Loopback Loopback at Doubler #2 to network initiated by IOR code or by the maintenance
terminal.
NDU3 Network Doubler 3 Loopback Loopback at Doubler #3 to the network initiated by IOR code or by the
maintenance terminal.
NDU4 Network Doubler 4 Loopback Loopback at Doubler #4 to the network initiated by IOR code or by the
maintenance terminal.
CLOC Customer Local Loopback Loopback at HRU (local) to CI initiated from CPE by the ILR code or by the
maintenance terminal.
CREM Customer Remote Loopback Loopback at HLU-319 (remote) to customer initiated by IOR code or by the
maintenance terminal.
CDU1 Customer Doubler 1 Loopback Loopback at Doubler #1 to CI initiated by ILR code or by the maintenance
terminal.
CDU2 Customer Doubler 2 Loopback Loopback at Doubler #2 to CI initiated by ILR code or by the maintenance
terminal.
CDU3 Customer Doubler 3 Loopback Loopback at Doubler #3 to CI initiated by ILR code or by the maintenance
terminal.
CDU4 Customer Doubler 4 Loopback Loopback at Doubler #4 to CI initiated by ILR code or by the maintenance
terminal.
ARM Armed The HiGain system has detected the IR loopback (2-in-5) arming code.
TLOS Transmit Loss of Signal
Loopback
HRU is in a logic loopback state caused by a loss of its T1 input from the CI (if
enabled at the HRU through its TLOS switch option).

Provisioning 150-319-153-01, Revision 01
14 April 30, 1999 HLU-319 List 5C
SET CLOCK
Press from the Maintenance Terminal Main Menu to open the Set Clock screen (Figure 7).
Figure 7. Set Clock Screen
Set Time
The cursor defaults to the New Time field. To set the system time, type the hour and minute in the 24-hour format
of hh:mm:ss (setting the seconds is optional), then press . The New Date field displays.
Set Date
To set the system date, type the month, day and year in a mm/dd/yy format, then press . The Update
Remote field displays.
Update the HRU Time and Date
The remote unit date and time is set by using this option. To update the remote, do one of the following:
•Press to update the HRU to the same date and time set for the HLU-319 or
•Press . (The remote unit is 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 entries in the Clock screen and when using the Terminal emulation program in
Windows 3.1, pressing the key deletes two characters at a time.
%
SET CLOCK
TIME: 00:14:33
DATE: 04/13/99
CIRCUIT ID#:
Format: HH:MM
MM/DD/YY
NEW TIME:
NEW DATE:
(U)PDATE REMOTE?
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