ADC HiGain HDSL2 User manual

HiGain
HiGain
HiGain HDSL2 Line Unit
H2TU-C-231 List 1E
Part Number: 150-2404-15
CLEI Code: VACH4VYC

152-231-115-03, Issue 03
ii April 21, 2000 H2TU-C-231
Revision History of This Practice
Copyright
April 21, 2000
© 2000 ADC DSL Systems, Inc. All rights reserved.
Trademark Information
ADC is a registered trademark of ADC Telecommunications, Inc. HiGain is a registered trademark of ADC DSL Systems, Inc.
No right, license, or interest to such trademarks is granted hereunder, and you agree that no such right, license, or interest
shall be asserted by you with respect to such trademark. Other product names mentioned in this practice are used for
identification purposes only and may be trademarks or registered trademarks of their respective companies.
Disclaimer of Liability
Information contained inthis document is company privateto ADC DSL Systems, Inc., and shall not be modified, used, copied,
reproduced or disclosed in whole or in part without the written consent of ADC.
Contents herein are current as of the date of publication. ADC reserves the right to change the contents without prior notice.
In no event shall ADC be liable for any damages resulting from loss of data, loss of use, or loss of profits, and ADC further
disclaims any and all liability for indirect, incidental, special, consequential or other similar damages. This disclaimer of
liability applies to all products, publications and services during and after the warranty period.
Revision Release Date Revisions Made
01 November 29, 1999 Initial release.
02 April 21, 2000 Firmware update.
03 January 08, 2002 ADC rebranding

152-231-115-03, Issue 03 Using This Technical Practice
H2TU-C-231 April 21, 2000 iii
USING THIS TECHNICAL PRACTICE
The following conventions are used in this manual:
•Monospace type indicates screen text.
•Keys you press are indicated by small icons such as or . Key combinations to be pressed
simultaneously are indicated with a plus sign as follows: + .
•Items you select are in bold.
•Three types of messages, identified by icons, appear in text.
For a list of abbreviations used in this document, refer to “Appendix E - Abbreviations” on page 67.
DOCUMENTATION
If you have comments on this PairGain document, send an email to [e-mail]. Type
the product name and the section number of the document in the subject area of the email message.
INSPECTING 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 shipment of each listed item. If the shipment is short
or irregular, contact PairGain as described in the Warranty located inside the back cover. If you must store
the equipment for a prolonged period, store the equipment in its original container.
Notes contain information about special circumstances.
Cautions indicate the possibility of equipment damage or personal injury.
The Electrostatic Discharge (ESD) susceptibility symbol indicates that a device or assembly is
susceptible to damage from electrostatic discharge.
YENTER
CTRL ESC

Inspecting Shipment 152-231-115-03, Issue 03
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152-231-115-03, Revision 03 Table of Contents
H2TU-C-231 List 1E April 21, 2000 v
TABLE OF CONTENTS
Overview ____________________________________________________________________________ 1
Features..............................................................................................................................................1
Compatibility .....................................................................................................................................2
Applications .......................................................................................................................................2
HiGain Regenerators..........................................................................................................................3
Front Panel __________________________________________________________________________ 4
Installation___________________________________________________________________________ 9
Verification ......................................................................................................................................10
Verification without a Downstream Device......................................................................10
Verification with a Downstream Device ...........................................................................10
Provisioning Requirements..............................................................................................................11
Provisioning_________________________________________________________________________ 12
Using the MODE and SEL Buttons.................................................................................................12
Setting Options through MODE and SEL.........................................................................12
Resetting to Factory Default Values..................................................................................13
Displaying System Parameter Settings..............................................................................13
Disabling an Alarm............................................................................................................13
Loopback Modes ...............................................................................................................13
Using a Maintenance Terminal........................................................................................................14
Connecting to a Maintenance Terminal.............................................................................14
The Logon Screen..............................................................................................................14
Provisioning Tasks...........................................................................................................................16
Setting Date and Time.......................................................................................................16
Setting Circuit ID Numbers...............................................................................................17
Making Changes to the System Configuration..................................................................18
Clearing the History, Alarm, and Event Log Screens .......................................................30
Monitoring System Activity and Performance ____________________________________________ 31
System Overview.............................................................................................................................31
Using the Monitor Screen to View System Activity........................................................................32
Using the Performance Screens to View Performance Data............................................................34
Performance History at the DS1 Interface.........................................................................35
Performance History at the HDSL2 Interface ...................................................................37
Current Statistics Screens for the DS1 Interface ...............................................................38
Current Statistics for HDSL2 Interface .............................................................................39
Using the Performance Screens to View Alarm Data......................................................................40
Alarm History at the DS1 Interface...................................................................................40

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Alarm History at the HDSL2 Interface............................................................................. 42
Using the Event Log to Track System Events................................................................................. 43
Testing _____________________________________________________________________________ 45
Front-Panel System Alarms............................................................................................................. 45
Alarm Option for Digital Loop Carrier (DLC) Feed ........................................................ 46
Retiring System Alarms.................................................................................................... 46
Remote LOS and AIS Response....................................................................................... 47
OCT55 Test Pattern with AMI Code............................................................................................... 47
Loopback Operation........................................................................................................................ 48
Generic Loopback Commands.......................................................................................... 48
Special Loopback Commands........................................................................................... 50
Manual Loopback Session ................................................................................................ 51
Loopback Test Procedures .............................................................................................................. 52
General Troubleshooting Tips .......................................................................................... 52
GNLB Test Procedures..................................................................................................... 52
A2LB Test Procedures...................................................................................................... 54
A3LB and A4LB Test Procedures .................................................................................... 57
Appendix A - Specifications____________________________________________________________ 58
Power Consumption ........................................................................................................................ 59
Maximum Power Dissipation.......................................................................................................... 59
Maximum Current Drain................................................................................................................. 59
H2TU-C-231 List 1E Card Connector ............................................................................................ 60
Network Management Control Bus .................................................................................. 60
Fuse Alarm........................................................................................................................ 61
System Alarm Output Pins................................................................................................ 61
Craft Port......................................................................................................................................... 61
Appendix B - Functional Operation _____________________________________________________ 62
Timing ............................................................................................................................................. 63
Ground Fault Detect........................................................................................................................ 63
Appendix C - Compatibility____________________________________________________________ 64
Appendix D - Product Support _________________________________________________________ 65
Appendix E - Abbreviations____________________________________________________________ 67
Certification and Warranty______________________________________________ Inside Back Cover
Limited Warranty ............................................................................................................................ 69

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List of Figures 152-231-115-03, Revision 03
viii April 21, 2000 H2TU-C-231 List 1E
LIST OF FIGURES
1. HDSL2 System Model.................................................................................................................................. 3
2. H2TU-C-231 List 1E Front Panel................................................................................................................. 4
3. Installing the H2TU-C-231List 1E into a Shelf............................................................................................ 9
4. Logon Screen .............................................................................................................................................. 15
5. Configuration Menu - Date and Time......................................................................................................... 16
6. Inventory Screen ......................................................................................................................................... 17
7. Configuration Menu.................................................................................................................................... 18
8. Configuration Menu - Standard Options (Defaults Shown) .......................................................................19
9. Configuration Menu - PairGain Options (Defaults Shown) .......................................................................19
10. Configuration Menu - Reset to Factory Defaults........................................................................................ 29
11. Master Clear................................................................................................................................................ 30
12. System Spans .............................................................................................................................................. 31
13. Monitor Screen - Active Loopback with Alarms........................................................................................ 32
14. H2TU-R DS1 31-day Performance History................................................................................................ 35
15. H2TU-C DS1 25-hour Performance History.............................................................................................. 35
16. H2TU-C HDSL2 31-day Performance History .......................................................................................... 37
17. H2TU-R DS1 Current Statistics.................................................................................................................. 38
18. H2TU-C DS1 Current Statistics.................................................................................................................. 38
19. H2TU-C HDSL2 Current Statistics ............................................................................................................ 39
20. H2TU-C DS1 Alarm History Screen .......................................................................................................... 40
21. H2TU-R DS1 Alarm History Screen .......................................................................................................... 41
22. H2TU-C HDSL2 Alarm History Screen..................................................................................................... 42
23. System Event Log....................................................................................................................................... 43
24. H2TU-R LOS and AIS Response Priorities................................................................................................ 47
25. Loopback Summary.................................................................................................................................... 48
26. Loopback Modes......................................................................................................................................... 53
27. H2TU-C-231 List 1E Card-edge Connector............................................................................................... 60
28. RS-232 Craft Port Pinouts........................................................................................................................... 61
29. H2TU-C-231 List 1E Block Diagram......................................................................................................... 62

152-231-115-03, Revision 03 List of Tables
H2TU-C-231 List 1E April 21, 2000 ix
LIST OF TABLES
1. Front-panel Description..................................................................................................................................5
2. Front-panel Display Messages .......................................................................................................................6
3. Navigational Keys for the HiGain HDSL2 Maintenance Terminal Screens................................................14
4. Logon Screen Menus...................................................................................................................................15
5. H2TU-C-231 List 1E Standard Config Screen Options...............................................................................20
6. H2TU-C-231 List 1E PairGain Config Screen Options...............................................................................21
7. DS1/DSX-1 24-hour PM Threshold.............................................................................................................23
8. Response to H2TU-R DS1 Frame Conversion Options...............................................................................24
9. Extended SuperFrame Format......................................................................................................................25
10. SuperFrame Format......................................................................................................................................26
11. DDS NI and DS0 DP Latching Loopback Sequence...................................................................................26
12. HiGain HDSL2 Loopback vs. Latching Sequence.......................................................................................27
13. Response of H2TU-C and H2TU-R to LOS and AIS..................................................................................28
14. Monitor Screen Descriptions........................................................................................................................33
15. Error Acronyms Used on the DS1 Performance History Screens................................................................36
16. Error Acronyms Used on the HDSL2 Performance History Screens ..........................................................37
17. DS1 Alarm Descriptions ..............................................................................................................................41
18. HDSL2 Alarm Descriptions.........................................................................................................................42
19. Event Log Entry Messages List....................................................................................................................44
20. Front-Panel System Alarms Summary........................................................................................................45
21. Summary of HiGain HDSL2 Loopback Codes and Activation Methods....................................................49
22. Addressable Repeater Loopback Commands (A2LB).................................................................................54
23. Addressable Repeater Loopback Commands (A3LB and A4LB) ...............................................................57
24. H2TU-C Power Parameters—No Regenerator ............................................................................................59

List of Tables 152-231-115-03, Revision 03
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152-231-115-03, Revision 03 Overview
H2TU-C-231 List 1E April 21, 2000 1
OVERVIEW
The HiGain HDSL2 product family from ADC®is the industry’s first practical implementation of High- bit-rate
Digital Subscriber Line 2 (HDSL2). ADC products are fully compliant with the HDSL2 standard. Providing
full-rate T1 access using just a single copper pair, HDSL2 is a cost-effective solution that offers an open
architecture. The open architecture inherent in HDSL2 guarantees interoperability, allowing simple, economic
accommodation of network growth. HiGain HDSL2 uses the industry’s first HDSL2 chipset (ANSI T1/E1.4
compliant) developed by ADC.
HiGain HDSL2 products provide 1.552 Mbps transmission on one unconditioned copper pair over the full Carrier
Service Area (CSA) range. The CSA includes loops up to 12,000 feet of 24 American Wire Gauge (AWG) wire
or 9,000 feet of 26 AWG wire, including bridged taps.
FEATURES
The H2TU-C-231 List 1E line unit is the Central Office (CO) side of a T1 transmission system.
•HDSL2 transmission features
–Three-span range with two regenerators (36 kft, 24 AWG)
–Lightning and power cross-protection on HDSL2 interfaces
–Full duplex HDSL2 transmission on one pair at 1.552 Mbps
–Ultra-low wander (Stratum 1 compliant)
–Grounded loop detection on High-bit-rate Digital Subscriber Line 2 (HDSL2)
•Front-panel provisioning features
–Four-character status display
–DS1 splitting and bridging access
–Status LED
–RS-232 craft port for connection to a maintenance terminal
•HiGain HDSL2 maintenance screens for inventory, provisioning, and troubleshooting
–High-performance, non-volatile performance monitoring
–Non-volatile alarm histories
–Performance Report Messaging (PRM) support for Supplemental PRM (SPRM) and Network PRM
(NPRM) at the H2TU-R
•Configuration options
–Selectable DS1 pre-equalizer
–Bipolar Violation Transparency (BPVT)
–Bit Error Rate (BER) alarm
–Loss of Signal/Alarm Indication Signal (LOS/AIS) payload alarm
–Remote provisioning
–Selectable loopback activation codes
•Compatible with Small Cross-section Shelf (SXSS) and equipment
•Digital Data Service (DDS) latching loopback

Overview 152-231-115-03, Revision 03
2 April 21, 2000 H2TU-C-231 List 1E
•Payload (PL) and HiGain (HG) loopback source identification
•Network Management and Administration (NMA) interface
•Margin Alarm (MAL) threshold
COMPATIBILITY
The H2TU-C-231 is designed to mount in 220 mechanics shelves. For a list of compatible shelves see
“Appendix C - Compatibility”on page 64.
APPLICATIONS
HiGain HDSL2 systems provide a cost-effective, easy-to-deploy method for delivering T1 High Capacity Digital
Service (HCDS) over a single copper pair. HiGain HDSL2 systems support a multitude of network connections
and system models (see Figure 1 on page 3).
•The service is deployed over one unconditioned, non-loaded copper pair.
•Conventional, inline, T1 repeaters are no longer required.
•Cable pair conditioning, pair separation, and bridged tap removal are not required.
Each loop has no more than 35 dB of loss at 196 kHz, with driving and terminating impedances of 135 W. In
general, HiGain HDSL2 systems:
•Operate effectively inthe same cable binder group withother HDSL2 lines, HDSL, T1,ADSL, SDSL, POTS,
DDS, and other transmission schemes.
•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.
DS1 is used throughout this document to refer to either the remote unit’s DS1 interface or the
line unit’s DSX-1 interface.

152-231-115-03, Revision 03 Overview
H2TU-C-231 List 1E April 21, 2000 3
Figure 1. HDSL2 System Model
HIGAIN REGENERATORS
For applications without regenerators (doublers), the H2TU-C-231 is directly connected to an H2TU-R remote
unit by one HDSL2 cable pair. The H2TU-C-231 List 1E is compatible with all HiGain H2TU-Rs.
For applications with regenerators, one to two regenerators may be used in the HDSL2 loop between the H2TU-C
and H2TU-R.
•The H2TU-C-231 List 1E can power one regenerator (H2RU-407 or H2RU-409) and a remote unit
(H2TU-R-402) for a total of two spans.
•If the H2TU-R is locally powered, the H2TU-C can power up to two regenerators for a total of three spans.
Future product enhancements of the H2TU-C-231 will support regenerators.

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FRONT PANEL
Figure 2 shows the H2TU-C-231 List 1Efront panel. Table 1 on page 5 describesthe front-panel components. For
pinout diagrams of the H2TU-C card-edge connector and craft port, refer to “Appendix A - Specifications”on
page 58.
Figure 2. H2TU-C-231 List 1E Front Panel

152-231-115-03, Revision 03 Front Panel
H2TU-C-231 List 1E April 21, 2000 5
Table 1. Front-panel Description
Front-panel Feature Function
Front-panel display Displays four-character status, provisioning, and alarm system messages. The front-panel
display illuminates when power is initially applied. To conserve power, the display only remains
on for 5 minutes. Using the MODE or SEL buttons reactivates the display and restarts the
5-minute timer. Refer to Table 2 on page 6 for a listing of the four-character messages.
MODE and SEL system option
buttons Permits the user options to be monitored and modified without the need of a maintenance terminal. Used to initiate all HiGain HDSL2 loopbacks and to display DSX-1 line parameters and
line unit identity.
Status LED The status LED can report the following conditions:
Off Line power is off.
Green Normal operation.
Red Fuse alarm.
Flashing red HDSL2 acquisition and system alarm.
Yellow An H2TU-C-231 Customer Remote Loopback (CREM) or a Network Local Loopback (NLOC) is in
effect.
Flashing yellow H2TU-C-231 is in an Armed (ARM) state.
DSX-1 access jacks
BRG Providesnon-intrusive bridging jack accessto(IN)andfrom (OUT)theHDSL2 span at the DSX-1
interface. Allows the two DS1 payloads to be monitored.
LINE Provides splitting jack access to (IN) and from (OUT) the HDSL2 span at the DSX-1 interface.
Breaks the IN and OUT paths to permit test signal insertion and retrieval.
Craft port (RS-232) 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 the human-readable Common Language Equipment Identifier (CLEI) code number and
the Equipment Catalog Item (ECI) bar code number.
List number Identifies the list number of the H2TU-C-231.
Retaining latch Retains the card in the shelf when pulled up and extracts the card from the shelf when pulled
down.
Configuration number For some products the configuration number may contain either a five- or six-digit warranty
configuration number or a stand-alone two or three-digit configuration number as follows:
Digit 1 - Last digit of shipment year
Digits 2 and 3 - Shipment month
Digits 4, 5, and 6 - Configuration number
The configuration number identifies the version of the product. New configuration numbers
usually accompany changes in the last two characters of the CLEI code.
The configuration number is found on a small label attached to the front panel. It is the last two
numbers (following the x) of a 13-character part number. For example: 150-1234-01-x01.

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Table 2 lists the front-panel display messages. The three- or four-character display reports the code of a pertinent
alarm, loopback, or diagnostic message and, in some cases, is followed by a second four-character message that
modifies the first message with a value or current configuration setting.
Table 2. Front-panel Display Messages
Message Full Name Description
ALARM MESSAGES
ACO Alarm CutOff A system alarm has occurred and has been retired to an ACO
condition by pressing the SEL button on the H2TU-C front panel.
ALRM Alarm Condition Exists A system alarm condition is in effect.
DBER DS1 Bit Error Rate A system DS1 BER alarm is in effect and remains in effect until
cleared.
HBER HDSL2 Block Error Rate A system HDSL2 Block Error Rate alarm is in effect.
LA Loop Attenuation Indicates that the attenuation on the HDSL2 loop has exceeded the
maximum threshold value.
LAIS Local Alarm Indication Signal Indicates an AIS (all ones) pattern is being transmitted from the
local DS1 output port.
LLOS Local Loss of Signal Indicates that no signal is detected at the DSX-1 input to the
H2TU-C. Causes a system alarm.
LOSW Loss of Sync Word Indicates that the HDSL2 loop has lost synchronization.
MAL Margin Alarm The margin on HDSL2 loop has dropped below the threshold
(0 to 15 dB) as set by the operator.
PWR FEED GND Ground The HDSL2 loop is grounded.
PWR FEED OPEN Open Indicates a line power open condition.
PWR FEED SHRT Short Indicates a short between the Tip and Ring of the HDSL2 pair.
PRMF Performance Report Messaging - Far
End H2TU-R PRM-FE BER threshold has been exceeded.
PRMN PerformanceReportMessaging-Near
End H2TU-R PRM-NE BER threshold has been exceeded.
RAIS Remote Alarm Indication Signal Indicates an AIS (all ones) pattern is being received at the H2TU-R
DS1 input port.
RLOS Remote Loss of Signal Indicates that no signal is detected at the DS1 input to the H2TU-R.
Causes a system alarm.
RRAI Remote RAI—Remote Alarm
Indication at the H2TU-R Indicates an RAI alarm (yellow) from the CPE with errors from the line unit or network.
SPNnSpan Number Accompanies the LOSW alarm and identifies the span where the
LOSW alarm occurred.
TRCI Transmit RAI-CI—Remote Alarm
Indication at the H2TU-R Upon reception of an RAI (yellow alarm) from the CPE, the H2TU-R sends RAI-CI towards the network if the network signal received at
the H2TU-R is clear. If the network signal is impaired (LOS, AIS, or
LOF), then the RAI is passed on to the network unaltered.
TUC Transmission Unit Central Office Accompanies the HBER, MAL, and LA alarm and indicates that the
alarm has occurred at the H2TU-C central office unit.
TUR Transmission Unit Remote End Accompanies the HBER, MAL, and LA alarm and indicates that the
alarm has occurred at the H2TU-R remote unit.

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H2TU-C-231 List 1E April 21, 2000 7
LOOPBACK MESSAGES
CRGnCustomer Regenerator nLoopback Signal from customer is looped back to the customer at H2RUn,
where nis the number of the regenerator.
CLOC Customer Local Loopback Signal from customer is looped back to the customer atthe
H2TU-R.
CREM Customer Remote Loopback Signal from customer is looped back to the customer at
H2TU-C-231.
NRGnNetwork Regenerator nLoopback DSX-1signalisloopedbacktothenetworkatH2RUn,wherenisthe
number of the regenerator.
NLOC Network Local Loopback DSX-1 signal is looped back to the network at the H2TU-C.
NREM Network Remote Loopback DSX-1 signal is looped back to the network at the H2TU-R.
SMJK Remote SmartJack Loopback DSX-1 signal is looped back to the network at the H2TU-R
SmartJack module.
DIAGNOSTIC MESSAGES
A = xx Maximum Loop Attenuation The Attenuation (A) message appears followed by xx, where xx is
the loop attenuation of the longest (maximum loss) span measured
in dB.
ACQ Acquisition The multiplexers of the H2TU-C and H2TU-R (or the H2TU-C and
first regenerator) are trying to establish synchronization over the
HDSL2 loop of Span 1.
AnLAcquisition nLoop ThemultiplexersofthetwodevicesonSpannaretrying to establish
synchronization with each other, where nis the number of the span.
ARM HiGain System Armed Armed to respond to Intelligent Repeater Loop (ILR) codes.
BAD RT? No Response from H2TU-R The H2TU-C does not receive any response from the H2TU-R.
Therefore, the integrity of the H2TU-R or the HDSL2 loop is
questionable.
FERR Framing Bit Error Occurred Framing bit error occurred at H2TU-C DSX-1 input.
FLDL Flash Download Flash download of firmware updates. Contact Customer Service for
update procedures (see “Appendix D - Product Support” on
page 65.)
HES HDSL2 CRC Error H2TU-C HDSL2 Loop Cyclical Redundancy Check (CRC) error.
LBPV Local Bipolar Violation A bipolar violation has been received at the DSX-1 input to the
H2TU-C-231.
M=xx HDSL2 Loop Margin Indicates the power of the received HDSL2 signal relative to noise
(S/N with respect to 21.5 dB). Any value of 6 dB or greater is
adequate for reliable system operation.
MNGD Managed The H2TU-C-231 is under control of the HMU-319 network
management unit. In this state, the front-panel craft port and push
buttons are disabled.
PWR FEED OFF Power Feed Off HDSL2 span power has been turned off by setting the PWFD option
to OFF, or HDSL2 span power has been turned off by use of the
A2LB Intelligent Office Repeater (IOR) powerdown code.
PWR FEED ON Power Feed On Indicates that the HDSL2 loop is not grounded or shorted.
SIG Signaling The transceivers of the H2TU-C and H2TU-R (or the H2TU-C and
firstregenerator)are tryingtoestablishcontactwitheachotherover
the HDSL2 loop of Span 1.
Table 2. Front-panel Display Messages (Cont.)
Message Full Name Description

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8 April 21, 2000 H2TU-C-231 List 1E
SnLSynchronization nLoop The transceivers of the twodevicesonSpannaretryingtoestablish
contact with each other, where nis the number of the span.
SYSTEM INFORMATION MESSAGES(a)
CODE xxxx Line Code: AMI, B8ZS TheDS1linecodesetting:AlternateMarkInversion(AMI)orBipolar
with 8-Zero Substitution (B8ZS).
FRM xxxx Frame: SF, ESF, UNFR Defines the type of frame pattern being received from the DSX-1:
SuperFrame (SF), Extended SuperFrame (ESF), or Unframed
(UNFR).
LATT xx Loop Attenuation The current loop attenuation threshold setting is measured in dB.
LIST xx H2TU-C-231 List Number The list number xx.
MARG xx Margin The current margin threshold setting is measured in dB.
VER x.xx H2TU-C-231 Software Version
Number The software version number x.xx.
(a) System information messages are displayed in Scroll Mode. To scroll through the messages, press the MODE and SEL
buttons for 3 or more seconds.
Table 2. Front-panel Display Messages (Cont.)
Message Full Name Description

152-231-115-03, Revision 03 Installation
H2TU-C-231 List 1E April 21, 2000 9
INSTALLATION
Figure 3. Installing the H2TU-C-231List 1E into a Shelf
1Align the H2TU-C with the enclosure slot guides and slide the unit in. Push the unit back until it touches the
backplane card-edge connector and the retaining latch on the front panel opens.
2Place your thumbs on the front panel and push the H2TU-C into the card-edge connector until the retaining
latch closes. This indicates that the card is properly seated.
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 ADC.
When installing an H2TU-C in a chassis, be sure to wear an antistatic wrist strap. Avoid touching
components on the circuit board.
To comply with the intrabuilding wiring requirements of GR-1089 CORE, Section 4.5.9, the
shields of the ABAM-type cables that connect the H2TU-C-231 List 1E DSX-1 output ports to the
cross-connect panel must be grounded at both ends.

Installation 152-231-115-03, Revision 03
10 April 21, 2000 H2TU-C-231 List 1E
VERIFICATION
Once the H2TU-C-231 is installed, verify that it is operating properly. To do this, monitor the following:
•Status LED
•Status messages reported by the front-panel display (Table 2 on page 6).
Verification without a Downstream Device
If there is no downstream device installed:
1Verify that the H2TU-C powers up. The front-panel display illuminates and reports status messages. (See
Table 2 on page 6 for a list of messages.)
2Verify that the H2TU-C attempts to communicate with downstream devices (status LED flashes red). Even
if a downstream device is not present, the following events should occur:
aThe front-panel display reports various four-character status messages.
bThe H2TU-C again attempts communication until a downstream device is detected.
Verification with a Downstream Device
If a downstream device has been installed:
1Verify that the H2TU-C powers up. (The front-panel display illuminates and reports various status messages.)
2Verify that the H2TU-C attempts to communicate with downstream devices (status LED flashes red). One of
the following occurs:
•If downstream devicesare successfully identified and the HDSL2 loop synchronizes, the H2TU-C status
LED lights a steady green. The H2TU-C reports normal margin messages on the front-panel display.
•If downstream devices are not successfully identified, the H2TU-C reports four-character status
messages. The H2TU-C attempts communication again and reports four-character status messages. The
H2TU-C repeats this cycle until a downstream device is detected.
3If there is more than one span, verify that each subsequent span synchronizes normally by monitoring the
front-panel display messages.
4If a remote unit is installed, verify that the last span synchronizes normally. The H2TU-C status LED should
light a steady green and the front-panel display should report normal margin messages.
5Verify that a valid DS1 signal has been applied to the H2TU-C and the H2TU-R.
•If no DS1 signal is being applied to either the H2TU-C or the H2TU-R inputs, then the appropriate DS1
alarms (LLOS or RLOS) display on the front panel and the status LED flashes red.
•If a valid DS1 signal is being supplied to the H2TU-C and H2TU-R, then DS1 alarm indications should
be absent and the status LED lights a steady green.