ADC H4TU-C-231-L1 User manual

HDSL4
HDSL4
USER MANUAL
H4TU-C-231 List 1 Line Unit
Product Catalog: H4TU-C-231-L1
CLEI: VACJMTNE

LTPH-UM-1138-02, Issue 2
ii September 12, 2003 H4TU-C-231 List 1
Revision History of This Manual
To order copies of this document, use document catalog number LTPH-UM-1138-02.
Copyright
September 12, 2003
© 2003 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 in this document is company private toADC 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.
Issue Release Date Revisions Made
1March 15, 2002 Initial release
2September 12, 2003 Added “Maximum Loop Attenuation” to Appendix A - Specifications.

LTPH-UM-1138-02, Issue 2 Using This Manual
H4TU-C-231 List 1 September 12, 2003 iii
USING THIS MANUAL
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 69.
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 ADC DSL Systems,
Inc. Order replacement equipment, if necessary.
•Check the packing list to ensure complete and accurate shipment of each listed item. If the shipment is short
or irregular, contact ADC DSL Systems, Inc. as described in “Appendix D - Product Support” on page 67. 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 personal injury or equipment damage.
The Electrostatic Discharge (ESD) symbol indicates that a device or assembly is susceptible to
damage from electrostatic discharge.
YENTER
CTRL ESC

Inspecting Shipment LTPH-UM-1138-02, Issue 2
iv September 12, 2003 H4TU-C-231 List 1

LTPH-UM-1138-02, Issue 2 Table of Contents
H4TU-C-231 List 1 September 12, 2003 v
TABLE OF CONTENTS
Overview ____________________________________________________________________________ 1
Features..............................................................................................................................................1
Applications.......................................................................................................................................2
Front Panel __________________________________________________________________________ 3
Installation___________________________________________________________________________ 8
Verification ........................................................................................................................................9
Verification without a Downstream Device........................................................................9
Verification with a Downstream Device .............................................................................9
Provisioning_________________________________________________________________________ 10
Using the MODE and SEL Buttons.................................................................................................10
Setting Options through MODE and SEL.........................................................................10
Resetting to Factory Default Values..................................................................................11
Displaying System Parameter Settings..............................................................................11
Disabling an Alarm............................................................................................................11
Loopback Modes ...............................................................................................................11
Using a Maintenance Terminal........................................................................................................12
Connecting to a Maintenance Terminal.............................................................................12
Logon Screen.....................................................................................................................12
Provisioning Tasks...........................................................................................................................15
Setting Date and Time.......................................................................................................15
Setting Circuit ID Numbers...............................................................................................16
Configuring the System.....................................................................................................17
Clearing the History, Alarm, and Event Log Screens .......................................................24
Monitoring System Activity and Performance ____________________________________________ 25
System Overview.............................................................................................................................25
Using the Monitor Screen to View System Activity........................................................................26
Using the Performance Screens to View Performance Data............................................................28
Performance History at the DS1 Interface.........................................................................28
Performance History at the HDSL4 Interface ...................................................................32
Using the Performance Screens to View Alarm Data......................................................................35
Alarm History at the DS1 Interface...................................................................................35
Alarm History at the HDSL4 Interface..............................................................................37
Using the Event Log to Track System Events .................................................................................39
Using the Report Menu....................................................................................................................41
Testing _____________________________________________________________________________ 43
System Alarms.................................................................................................................................43

Table of Contents LTPH-UM-1138-02, Issue 2
vi September 12, 2003 H4TU-C-231 List 1
Alarm Option for Digital Loop Carrier (DLC) Feed ........................................................ 45
Retiring System Alarms.................................................................................................... 45
Remote LOS and AIS Response....................................................................................... 46
OCT55 Test Pattern with AMI Line Code...................................................................................... 46
Loopback Operation........................................................................................................................ 47
Generic Loopback Commands.......................................................................................... 48
Special Loopback Commands........................................................................................... 48
Manual Loopback Session................................................................................................ 49
Loopback Test Procedures .............................................................................................................. 50
General Troubleshooting Tips .......................................................................................... 50
GNLB Test Procedures..................................................................................................... 52
A3LB Test Procedure........................................................................................................ 53
A5LB Test Procedure........................................................................................................ 54
Testing with H4TU-C BERT Generator.......................................................................................... 57
Testing with H4TU-R BERT Generator.......................................................................................... 58
Appendix A - Specifications____________________________________________________________ 59
Power Consumption ........................................................................................................................ 60
Maximum Power Dissipation.......................................................................................................... 60
Maximum Current Drain................................................................................................................. 61
Loop Attenuation, Insertion Loss, and Reach ................................................................................. 61
H4TU-C-231 List 1 Card-Edge Connector ..................................................................................... 62
Network Management Control Bus .................................................................................. 62
Fuse Alarm........................................................................................................................ 62
Craft Port......................................................................................................................................... 63
Appendix B - Functional Operation _____________________________________________________ 64
Timing ............................................................................................................................................. 64
Ground Fault Detect........................................................................................................................ 64
Spectrum Issues............................................................................................................................... 65
Appendix C - Compatibility____________________________________________________________ 66
Appendix D - Product Support _________________________________________________________ 67
Appendix E - Abbreviations____________________________________________________________ 69
Certification and Warranty____________________________________________________________ 71

LTPH-UM-1138-02, Issue 2 List of Figures
H4TU-C-231 List 1 September 12, 2003 vii
LIST OF FIGURES
1. H4TU-C-231 List 1 List 1 Front Panel...........................................................................................................3
2. Installing the H4TU-C-231 List 1 into a Shelf ...............................................................................................8
3. Logon Screen ................................................................................................................................................13
4. Config Menu - Date and Time......................................................................................................................15
5. Inventory Menu.............................................................................................................................................16
6. Config Menu.................................................................................................................................................17
7. Config Menu - Standard Options (Defaults Shown).....................................................................................18
8. Config Menu - ADC Options (Defaults Shown) ..........................................................................................18
9. Configuration Menu - Reset to Factory Defaults..........................................................................................23
10. Configuration Menu - Master Clear..............................................................................................................24
11. System Spans ................................................................................................................................................25
12. Monitor Screen - Active Loopback with Alarms..........................................................................................26
13. H4TU-R DS1 31-Day Performance History.................................................................................................28
14. H4TU-C DS1 25-Hour Performance History ...............................................................................................29
15. H4TU-C DS1 48-Hour Performance History ...............................................................................................29
16. H4TU-R DS1 Current Statistics....................................................................................................................30
17. H4TU-C DS1 Current Statistics....................................................................................................................30
18. H4TU-C HDSL (Loop 1/Loop2) 31-Day Performance History...................................................................32
19. H4TU-C HDSL (Loop 1/Loop 2) 48-Hour Performance History ................................................................32
20. H4TU-C HDSL (Loop 1/Loop 2) 25-Hour Performance History ................................................................33
21. H4TU-C HDSL (Loop 1/Loop 2) Current Statistics.....................................................................................33
22. H4TU-C DS1 Alarm History Screen............................................................................................................35
23. H4TU-R DS1 Alarm History Screen............................................................................................................36
24. H4TU-C HDSL4 Alarm History Screen.......................................................................................................37
25. System Event Log.........................................................................................................................................39
26. Report Menu - Full Report............................................................................................................................41
27. H4TU-R LOS and AIS Response Priorities..................................................................................................46
28. Loopback Summary......................................................................................................................................47
29. Loopback Modes...........................................................................................................................................51
30. H4TU-C BERT Generator Screen ................................................................................................................57
31. H4TU-R BERT Generator Screen ................................................................................................................58
32. H4TU-C-231 List 1 Card-Edge Connector...................................................................................................62
33. RS-232 Craft Port Pinouts.............................................................................................................................63
34. H4TU-C-231 List 1 Block Diagram .............................................................................................................64

List of Figures LTPH-UM-1138-02, Issue 2
viii September 12, 2003 H4TU-C-231 List 1

LTPH-UM-1138-02, Issue 2 List of Tables
H4TU-C-231 List 1 September 12, 2003 ix
LIST OF TABLES
1. Front-Panel Description..................................................................................................................................4
2. Front-Panel Display Messages........................................................................................................................5
3. Navigational Keys for the HDSL4 Maintenance Terminal Screens.............................................................12
4. Logon Screen Menus ...................................................................................................................................13
5. H4TU-C-231 List 1 Standard Config Screen Options..................................................................................19
6. H4TU-C-231 List 1 ADC Config Screen Options........................................................................................20
7. DS1/DSX-1 24-Hour PM Threshold.............................................................................................................22
8. Monitor Screen Descriptions ........................................................................................................................27
9. Acronyms Used on the DS1 Performance History Screens..........................................................................31
10. Acronyms Used on the HDSL4 Performance History Screens.....................................................................34
11. DS1 Alarm Descriptions...............................................................................................................................36
12. HDSL4 Alarm Descriptions..........................................................................................................................38
13. Event Log Entry Messages List....................................................................................................................40
14. Report Types.................................................................................................................................................42
15. Front-Panel System Alarms..........................................................................................................................43
16. Summary of HDSL4 Loopback Codes .........................................................................................................52
17. A3LB Addressable Repeater Loopback Commands ....................................................................................53
18. A5LB Addressable Repeater Loopback Commands ....................................................................................54
19. BERT Signal Generator Option Settings......................................................................................................57
20. H4TU-C Power Parameters ..........................................................................................................................60
21. HDSL4 Reach Chart .....................................................................................................................................61

List of Tables LTPH-UM-1138-02, Issue 2
x September 12, 2003 H4TU-C-231 List 1

LTPH-UM-1138-02, Issue 2 Overview
H4TU-C-231 List 1 September 12, 2003 1
OVERVIEW
The H4TU-C-231 List 1 is the Central Office (CO) side of a repeaterless T1 transmission system. The four-wire
HDSL4 product family (hereafter referred to as “HDSL4”) is based on the HDSL4 standard ANSI T1.418 Issue 2.
The H4TU-C, when used with an H4TU-Rremote unit, transmits a 1.544 Mbps payload up to a maximum distance
of 12 kft. over two unconditioned copper pairs. Using two doublers (H4Ds), the Carrier Service Area (CSA) reach
can be extended to a maximum of 34 kft.
The H4TU-C-231 List 1 is designed to mount in 220 mechanics shelves. For a list of compatible shelves see
“Appendix C - Compatibility” on page 66.
FEATURES
The H4TU-C-231 List 1 line unit is the Central Office (CO) side of a T1 transmission system.
•HDSL4 transmission features
—Three-span range with two doublers (36 kft, 24 AWG)
—Lightning and power cross-protection on HDSL4 interfaces
—Full-duplex HDSL4 transmission on four wire at 1.568 Mbps
—Ultra-low wander (Stratum 1 compliant)
—Grounded loop detection on either HDSL4 spans
—Spectrum compatibility with Asymmetric Digital Subscriber Line (ADSL) services
—Bit Error Rate Tester (BERT)
•Front-panel provisioning features
—Four-character status display
—DS1 splitting and bridging access
—Status Light Emitting Diode (LED)
—RS-232 craft port for connection to a maintenance terminal
—MODE and SEL pushbuttons
—Front panel dual loopback commands
•Maintenance screens for inventory, provisioning, and troubleshooting
—DS1 and HDSL4 performance monitoring
—DS1 and HDSL4 alarm histories
—Payload (PL) and HDSL Generic (HG) loopback source identification
—Margin Alarm (MAL) threshold
—Report menu option for downloading status and performance monitoring data to a file
—Sources sealing current when connected to any locally powered H4TU-R-402 List 1
—Remote access and control of H4TU-R test signal generator
•Both doubler and non-doubler applications are compatible with ADSL services at same binder group
•Configuration options
—Selectable DSX-1 pre-equalizer

Overview LTPH-UM-1138-02, Issue 2
2 September 12, 2003 H4TU-C-231 List 1
—Bipolar Violation Transparency (BPVT)
—Bit Error Rate (BER) alarm
—Power Back Off Network (PBON) and Power Back Off Customer (PBOC) options for configuring
HDSL4 transmit power levels
—Loss of Signal/Alarm Indication Signal (LOS/AIS) payload alarm
—Remote provisioning
—Concurrent detection of all loopback activation codes
•Additional Loopback Timeout (LBTO) settings of 8 hours and 24 hours
•Network Management and Administration (NMA) interface
APPLICATIONS
HDSL4 systems provide a cost-effective, easy-to-deploy method for delivering T1 High Capacity Digital Service
(HCDS) over two pair of wires. HDSL4 systems support a multitude of network connections.
•The service is deployed over two unconditioned, non-loaded copper pair at 784 kps per loop.
•Conventional, inline DS1 repeaters are no longer required.
•Cable pair conditioning, pair separation, and bridged tap removal are not required.
For Span 1, each loop has no more than 47 dB of inserting loss at 196 kHz, with driving and terminating
impedances of 135Ω; for Span 2 and Span 3, each loop has no more than 43 dB of insertion loss at 196 kHz. In
general, HDSL4 systems:
•Operate effectively in the same cable binder group with other HDSL4 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.

LTPH-UM-1138-02, Issue 2 Front Panel
H4TU-C-231 List 1 September 12, 2003 3
FRONT PANEL
Figure 1 shows the H4TU-C-231 List 1 front panel. Table 1 on page 4 describes the front-panel components. For
a list of front-panel display messages, refer to Table 2 on page 5. For pinout diagrams of the H4TU-C card-edge
connector and craft port, refer to Figure 32 on page 62 and Figure 33 on page 63.
Figure 1. H4TU-C-231 List 1 List 1 Front Panel
H
4
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1
C
MODE SEL
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OUT
BRG
IN
LIST
LINE
LINE
BRG
DSX-1
R
S
2
3
2
STATUS
Front-panel display
MODE and SEL
system option buttons
DSX-1 access jacks
Craft port
CLEI and ECI
barcode label
List number
Retaining latch
Status LED
1
DCE

Front Panel LTPH-UM-1138-02, Issue 2
4 September 12, 2003 H4TU-C-231 List 1
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 5 for a listing of the four-character messages.
MODE and SEL system option
buttons
Permits user options to be monitored and modified without the need of a maintenance terminal.
Used to initiate all HDSL4 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 HDSL4 acquisition or system alarm.
Yellow An H4TU-C-231 List 1 Customer Remote Loopback (CREM) or a Network Local Loopback (NLOC)
is in effect.
Flashing yellow H4TU-C-231 List 1 is in an Armed (ARM) state.
DSX-1 access jacks
BRG Provides non-intrusive bridging jack access to (IN) and from (OUT) the HDSL4 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 HDSL4 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 H4TU-C-231.
Retaining latch Retains the card in the shelf when pulled up and extracts the card from the shelf when pulled
down.

LTPH-UM-1138-02, Issue 2 Front Panel
H4TU-C-231 List 1 September 12, 2003 5
Table 2 lists the front-panel display messages. The 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 pushbutton on the H4TU-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.
DU1U or DU1D Doubler 1 Upstream or
Downstream Port
Precedes LA, HBR, and MAL and indicates the first H4D doubler HDSL4
upstream or downstream interface.
DU2U or DU2D Doubler 2 Upstream or
Downstream Port
Precedes LA, HBR, and MAL and indicates the second H4D doubler HDSL4
upstream or downstream interface.
HBRx HDSL4 Block Error Rate Loop 1 or
Loop 2
A system HDSL4 Block Error Rate alarm is in effect. (xindicates Loop 1 or
Loop 2.)
LAxLoop Attenuation Loop 1 or Loop 2 The attenuation on the HDSL4 loop has exceeded the maximum threshold
value. (xindicates Loop 1 or Loop 2.)
LAIS Line Alarm Indication Signal Indicates an AIS (unframed all ones) pattern is being received or
transmitted at the H4TU-C DS1 input or output ports.
LLOS Line Loss of Signal Indicates that no signal is detected at the DSX-1 input to the H4TU-C.
Causes a system alarm.
LOF Loss of Frame The DS1 input does not contain the ESF or SF frame pattern setting of the
FRMG option.
LOSW Loss of Sync Word Indicates that one of the HDSL4 loops has lost synchronization.
LRAI Line RAI Indicates an RAI alarm (yellow) from the CPE with an error-free signal
from the line unit or network. RAI signal is transmitted towards the
network.
MALx Margin Alarm Loop 1 or Loop 2 The margin at Loop 1 or Loop 2 of the HDSL4 interface has dropped below
the threshold (0 to 15 dB) set by the operator. (xindicates Loop 1 or
Loop 2.)
PWR FEED GND Power Feed Ground The HDSL4 loop is grounded.
PWR FEED OPEN Power Feed Open Indicates a line power open condition.
PWR FEED SHRT Power Feed Short Indicates a short between the Loop 1 and Loop 2 of the HDSL4 pair.
PRMF Performance Report Messaging -
Far End
H4TU-R PRM-FE BER threshold has been exceeded at far end.
PRMN Performance Report Messaging -
Near End
H4TU-R PRM-NE BER threshold has been exceeded at near end.
RAIS Remote Alarm Indication Signal Indicates an AIS (unframed all ones) pattern is being received or
transmitted at the H4TU-R DS1 input or output ports.
RLOS Remote (Unit) Loss of Signal Indicates that no signal is detected at the DS1 input to the H4TU-R. Causes
a system alarm.
RRAI Remote RAI—Remote Alarm
Indication at the H4TU-R (Net
signal has errors.)
Indicates an RAI alarm (yellow) from the CPE with errors from the line unit
or network. RAI-CI signal is transmitted towards the network.
SPNnSpan Number Accompanies the LOSW alarm and identifies the span where the LOSW
alarm occurred.
TUC Transmission Unit Central Office Accompanies the DBER, HBER, MAL, LA, and LOF alarms and indicates
that the alarm has occurred at the H4TU-C central office unit.
TUR Transmission Unit Remote End Accompanies the DBER, HBER, MAL, LA, and LOF alarms and indicates
that the alarm has occurred at the H4TU-R remote unit.

Front Panel LTPH-UM-1138-02, Issue 2
6 September 12, 2003 H4TU-C-231 List 1
LOOPBACK MESSAGES
CDU1 Customer Doubler 1 Loopback DS1 signal from customer is looped back to the customer at H4D1
(111100).
CDU2 Customer Doubler 2 Loopback DS1 signal from customer is looped back to the customer at H4D2
(111110).
CLOC Customer Local Loopback DS1 signal from customer is looped back to the customer at the H4TU-R.
COLB Central Office Loopback Dual loopback at the H4TU-C.
CREM Customer Remote Loopback DS1 signal from customer is looped back to the customer at the H4TU-C.
NDU1 Network Doubler 1 Loopback Signal is looped back to the network at H4D1 (110000).
NDU2 Network Doubler 2 Loopback Signal is looped back to the network at H4D2. (111000)
NLOC Network Local Loopback DSX-1 signal is looped back to the network at the H4TU-C.
NREM Network Remote Loopback DSX-1 signal is looped back to the network at the H4TU-R.
RULB Remote Unit Loopback Dual loopback at the H4TU-R.
SMJK Remote SmartJack Loopback DSX-1 signal is looped back to the network at the H4TU-R SmartJack
module.
DIAGNOSTIC MESSAGES
A=xx Maximum Loop Attenuation The Attenuation (A) message appears followed by xx, where xx is the
highest loop attenuation of all HDSL interfaces.
ACQ1 or ACQ2 Acquisition 1 or Acquisition 2 The multiplexers of the H4TU-C and H4TU-R are trying to establish
synchronization over HDSL4 Loop 1 or Loop 2.
ARM System Armed Armed to respond to Intelligent Repeater Loop (ILR) codes.
BAD RT? No Response from H4TU-R The H4TU-C receives no response from the H4TU-R, and all HDSL4 loop
conditions are normal. Therefore, the integrity of the H4TU-R or the
HDSL4 loops is questionable.
FERR Framing Bit Error Occurred Framing bit error occurred at H4TU-C DSX-1 input.
HxES HDSL4 CRC Error Loop 1 or Loop 2 H4TU-C HDSL4 Loop 1 or Loop 2 Cyclical Redundancy Check (CRC) error.
(Loop 1 has display priority over Loop 2.)
LBPV Local Bipolar Violation A bipolar violation has been received at the DSX-1 input to the H4TU-C.
1=xx or 2=yy HDSL4 Loop Margin Indicates the power of the received HDSL4 signal of each loop 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 H4TU-C is under control of the HMU-319 network management unit.
In this state, the front-panel craft port and pushbuttons are disabled.
PWR FEED OFF Power Feed Off HDSL4 span power has been turned off by setting the PWRF option to off,
or HDSL4 span power has been turned off by use of the A5LB Intelligent
Office Repeater (IOR) powerdown code.
PWR FEED ON Power Feed On Indicates that the HDSL4 loop power is applied and neither pair is
grounded.
SIG1 or SIG2 Signaling The transceivers of the H4TU-Cand H4TU-R are trying to establish contact
with each other over HDSL4 on Loop 1 or Loop 2.
SYSTEM INFORMATION MESSAGES (a)
VER x.xx Software Version Number The software version number of the H4TU-C.
LIST xx List Number The list number of the H4TU-C.
Continued
Table 2. Front-Panel Display Messages (Continued)
Message Full Name Description

LTPH-UM-1138-02, Issue 2 Front Panel
H4TU-C-231 List 1 September 12, 2003 7
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).
CODE xxxx Line Code: AMI, B8ZS The line code that the H4TU-C is receiving at its DSX-1 interface, if the DS1
option is set to AUTO. Otherwise, it mimics either of the other two DS1 line
codes: Alternate Mark Inversion (AMI) or Bipolar with 8-Zero Substitution
(B8ZS).
LATT xx Loop Attenuation The current loop attenuation threshold setting measured in dB.
MARG xx Margin The current margin threshold setting measured in dB.
(a) System information messages scroll in the order listed. To scroll through the messages, press the MODE pushbutton for 3 or
more seconds. After system information messages scroll, the front panel displays the line card options (see Table 5 on
page 19 and Table 6 on page 20).
Table 2. Front-Panel Display Messages (Continued)
Message Full Name Description

Installation LTPH-UM-1138-02, Issue 2
8 September 12, 2003 H4TU-C-231 List 1
INSTALLATION
Figure 2. Installing the H4TU-C-231 List 1 into a Shelf
1Align the H4TU-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 H4TU-C into the slot guides until 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 H4TU-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 H4TU-C DSX-1 output ports to the
cross-connect panel must be grounded at both ends.
CO Shelf
H4TU-C-231

LTPH-UM-1138-02, Issue 2 Installation
H4TU-C-231 List 1 September 12, 2003 9
VERIFICATION
Once the H4TU-C is installed, verify that it is operating properly. To do this, monitor the following:
•Status LED
•Status messages reported by the front-panel display (see Table 2 on page 5)
Verification without a Downstream Device
If there is no downstream device installed:
1Verify that the H4TU-C powers up. The front-panel display illuminates and reports status messages. (See
Table 2 on page 5 for a list of messages.)
2Verify that the H4TU-C attempts to communicate with downstream devices (status LED flashes red). Even
if a downstream device is not present, the following events should occur:
•The front-panel display reports various four-character status messages.
•The H4TU-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 H4TU-C powers up. (The front-panel display illuminates and reports various status messages.)
2Verify that the H4TU-C attempts to communicate with downstream devices (status LED flashes red). One of
the following occurs:
•If downstream devices are successfully identified and the HDSL4 loop synchronizes, the H4TU-C status
LED lights steady green. The H4TU-C reports normal margin and loop attenuation messages on the
front-panel display.
•If downstream devices are not successfully identified, the H4TU-C reports four-character status
messages. The H4TU-C attempts communication again and reports four-character status messages. The
H4TU-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 H4TU-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 H4TU-C and the H4TU-R.
•If no DS1 signal is being applied to either the H4TU-C or the H4TU-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 H4TU-C and H4TU-R, then DS1 alarm indications should
be absent and the status LED should be steady green.

Provisioning LTPH-UM-1138-02, Issue 2
10 September 12, 2003 H4TU-C-231 List 1
PROVISIONING
There are two methods for provisioning:
•Use the MODE and SEL buttons on the front panel of the H4TU-C to:
—Set system options
—Reset the H4TU-C to its factory default settings for system options
—Display system option settings (scroll mode)
—Select system loopbacks
•Use a maintenance terminal (VT100 terminal or a PC running terminal emulation software) connected to the
H4TU-C craft port (or to an HMU craft port) to access the maintenance screens (Figure 3 on page 13). This
gives you full access to all H4TU-C status, history, inventory, and provisioning screens.
USING THE MODE AND SEL BUTTONS
Setting Options through MODE and SEL
To provision the H4TU-C-231 List 1 through the MODE and SEL pushbuttons on the front panel:
1Press the MODE button for 1 second and then release it. The front-panel display alternately shows the first
system parameter and its current setting.
2Press the SEL button to step through all possible settings of the selected parameter. (See Table 5 on page 19
and Table 6 on page 20.)
3After the desired setting has been selected, press the MODE button. This updates the currently displayed
parameter to the selected setting, then advances to the next configurable parameter. After the last parameter
has been selected, a CONF NO message appears on the front-panel display.
4Do one of the following:
•To cancel the session without saving the requested parameter changes, press the MODE button or do
nothing. (After 30 seconds, the display returns to its normal mode without saving the new changes.)
•To accept the requested parameter changes, press the SEL button. (A CONF YES message displays and
returns to its normal mode after saving the new changes.)
The MNGD message displays if the H4TU-C-231 List 1 is under HMU management. When this
occurs, the front-panel pushbuttons and craft port are disabled.
No dip switches or jumpers are required to provision the H4TU-C-231 List 1 as it contains a
non-volatile RAM (NVRAM) which stores the system option settings. System option settings are
retained if shelf power is lost or if the H4TU-C-231 List 1 is unplugged.