ADTRAN HDSL DDM+ HTU-C Instruction Manual

HDSL DDM+
Transceiver Unit for Central Office
Installation and Maintenance Practice
Document Number: 61247003L6-5A
CLEI: T1I3AANA_ _
April 2008
®

HDSL DDM+ Transceiver Unit for Central Office Installation and Maintenance Practice
ii 61247003L6-5A
Front Matter
Trademarks
Any brand names and product names included in this document are trademarks, registered
trademarks, or trade names of their respective holders.
To the Holder of this Document
The contents of this document are current as of the date of publication. ADTRAN®reserves the
right to change the contents without prior notice.
In no event will ADTRAN be liable for any special, incidental, or consequential damages or
for commercial losses even if ADTRAN has been advised thereof as a result of issue of this
document.
901 Explorer Boulevard
P.O. Box 140000
Huntsville, AL 35814-4000
[phone]
©2007 ADTRAN, Inc.
All Rights Reserved.
®

61247003L6-5A iii
Revision History
Conventions
The following typographical conventions are used in this document:
This font indicates a cross-reference link.
This font indicates screen menus, fields, and parameters.
THIS FONT indicates keyboard keys (ENTER, ESC, ALT). Keys that are to be pressed simultaneously
are shown with a plus sign (ALT+Xindicates that the ALT key and Xkey should be pressed at the
same time).
This font indicates references to other documentation and is also used for emphasis.
This font indicates on-screen messages and prompts.
This font indicates text to be typed exactly as shown.
This font indicates silk-screen labels or other system label items.
This font is used for strong emphasis.
NOTE
Notes inform the user of additional, but essential, information or
features.
CAUTION
Cautions inform the user of potential damage, malfunction, or
disruption to equipment, software, or environment.
WARNING
Warnings inform the user of potential bodily pain, injury, or death.
Revision Date Description
AApril 2008 Initial release

HDSL DDM+ Transceiver Unit for Central Office Installation and Maintenance Practice
iv 61247003L6-5A
Training
ADTRAN offers training courses on our products. These courses include overviews on product
features and functions while covering applications of ADTRAN product lines. ADTRAN
provides a variety of training options, including customized training and courses taught at our
facilities or at customer sites.
For inquiries concerning training, contact ADTRAN:
Training Phone: [phone], ext. 6996
Training Fax: [phone]
Training Email: [email protected]

61247003L6-5A v
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
HDSL Deployment Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Shipping Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Shelf Population (Based on Power Requirements) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Instructions for Installing the DDM+ HTU-C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Front Panel Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Provisioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Alarm Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Front Panel Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Status/Alarm Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Display Off Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
View, Default, and Loopback Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
View Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Default Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Loopback Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Control Port Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Menu Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Menu Navigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Screen Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Menu Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
HDSL Main Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Current System Status Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Current System Status - HRE Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Performance History Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Performance History - HRE Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Loopbacks Options Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Self-Test Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

HDSL DDM+ Transceiver Unit for Central Office Installation and Maintenance Practice
vi 61247003L6-5A
Provisioning Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Troubleshooting Display Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Alarm History Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Set Time/Date/Circuit ID Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Set Time Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Set Date Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Set Circuit ID Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Default Options Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Terminal Modes Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
HDSL System Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
HTU-C Loopbacks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Troubleshooting Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Appendix A
HDSL Loopbacks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
HDSL Maintenance Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Loopback Process Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Loopback Control Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Appendix B
Remote Provisioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Remote Provisioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Loopback Process Description B-1 Unframed In-band 11-Bit Commands . . . . . . . . . . . . . . . . . . . . . . . B-1
ADA Mode Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
ADTRAN Mode Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-6
B-2 ESF FDL Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-8
Appendix C
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
Warranty and Customer Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
ADTRAN Sales . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
ADTRAN Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
ADTRAN Repair/CAPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
Repair and Return Address. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1

Contents
61247003L6-5A vii
Figures
Figure 1. DDM+ HTU-C Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2. HDSL Deployment Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 3. DDM+ HTU-C Edge Connector Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 4. DDM+ HTU-C Span Powering Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 5. Front Panel Four Character Display and Pushbuttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 6. RS-232 (DB9) Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 7. Introductory Menu Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 8. HDSL Main Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 9. Current System Status Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 10. Current System Status - HRE Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 11. Performance History Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 12. Performance History - HRE Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 13. Loopback Options Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 14. Self-Test Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 15. Provisioning Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 16. Troubleshooting Display Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 17. Alarm History Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 18. Set Time/Date/Circuit ID Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 19. Set Time Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 20. Set Date Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 21. Set Circuit ID Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 22. Default Options Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 23. Terminal Modes Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 24. HDSL Loopbacks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Tables
Table 1. HDSL Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Table 2. Compliance Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Table 3. HDSL Loss Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 4. Loop Insertion Loss Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 5. Front Panel LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 6. Provisioning Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 7. Four Character Display Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 8. Status/Alarm Display (STAT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 9. Option Settings Display (VIEW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 10. Loopback Options Display (LPBK) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Table 11. Screen Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Table 12. HDSL Main Menu Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 13. HDSL, DS1, and DSX-1 Key Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Table 14. Pair Reversal Key Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Table 15. HDSL Loop Signal Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Table 16. ADTRAN Noise Margin Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

HDSL DDM+ Transceiver Unit for Central Office Installation and Maintenance Practice
viii 61247003L6-5A
Table 17. Set Time/Date/Circuit ID Menu Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Table 18. Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Table 19. DDM+ HTU-C Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Table A-1. HDSL Loopback Control Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-2
Table A-2. In-band Addressable Loopback Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-3
Table B-1. ADA Mode 11-Bit Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-2
Table B-2. ADTRAN Mode 11-Bit Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-6
Table B-3. ESF FDL Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-8

61247003L6-5A 1
HDSL DDM+ Transceiver Unit
for Central Office
INTRODUCTION
This practice is an installation and maintenance guide for the ADTRAN®HDSL DDM+ Transceiver
Unit for Central Office (DDM+ HTU-C). The DDM+ HTU-C (P/N 1247003L6) front panel is illus-
trated in Figure 1.
Figure 1. DDM+ HTU-C Front Panel

HDSL DDM+ Transceiver Unit for Central Office Installation and Maintenance Practice
261247003L6-5A
DESCRIPTION
DSX-1 signals are provided to and from the network while 2B1Q HDSL signals are provided to
the local loop. The DDM+ HTU-C works in conjunction with the ADTRAN HDSL Transceiver
Unit for the Remote end (HTU-R) and HDSL Range Extender (HRE) to provide a DS1 service up
to 36,000 feet on the local loop.
The DDM+ HTU-C works with multiple list versions of the HTU-R and HRE as listed below in
Table 1.
The DDM+ HTU-C can be deployed in circuits consisting of one HTU-C and one HTU-R. When
deployment requires the HRE, the DDM+ HTU-C can be deployed with one or two HREs and
one HTU-R.
The HDSL local loop operates as two independent subsystems each operating over a single
twisted pair. The DDM+ HTU-C communicates over these two twisted pairs to the HTU-R.
Each subsystem carries half of the total bandwidth along with a small amount of overhead
used for maintenance and performance monitoring related functions.
System power and alarm bus connections are made through the backplane of the DDM+ shelf.
DSX-1 and HDSL signals are connected through the wire-wrap pins related to each individual
slot located on the rear of the shelf.
The DDM+ HTU-C uses a DC-to-DC converter to derive its internal logic and span powering
voltages from the –48 VDC office supply.
The DDM+ HTU-C can span power HREs and HTU-Rs as listed above. When used with HREs and
HTU-Rs, the DDM+ HTU-C can be configured to span power the HTU-R and HRE at –190 VDC
(for applications requiring two HREs and an HTU-R). Span powering voltages meet all require-
ments for Class A2 voltages of by Bellcore GR-1089-CORE.
The DDM+ HTU-C contains an onboard fuse. If a fuse opens, it supplies a –48 VDC voltage to
the fuse alarm bus and turns all front panel indicators off. These fuses are not designed to be
field replaceable.
Table 1. HDSL Compatibility
Part Numbers Description
1245024L1 T400 HTU-R with Local Power Option
1246026Lx 6th Gen HTU-R
1247024L1 7th Gen HTU-R, Local Power
1247026Lx 7th Gen HTU-R, Span Power
1246041L1 6th Gen T200 HRE
1246045L1 6th Gen 239 HRE
1247041L1 7th Gen T200 HRE
1247045L1 7th Gen 239 HRE
x = any number

Description
61247003L6-5A 3
Compliance
The DDM+ HTU-C is NRTL Listed to the applicable UL standards for continuous use in
–40°C to +50°C environmental conditions. Care should be exercised when handling
equipment when temperatures at these extremes exist, as surfaces could be very cold or
hot.
The DDM+ HTU-C meets or exceeds all the applicable requirements of NEBS, Telcordia
GR-63-CORE and GR-1089-CORE and is evaluated to ensure proper operational performance
is maintained if environmental conditions ranging from –40°C to +71°C are encountered.
The DDM+ HTU-C is intended for deployment in Central Office type facilities, EEEs, EECs,
and locations where the NEC applies (for example, customer premises). Install the DDM+
HTU-C in the appropriate chassis, which is intended to be installed only in Restricted Access
Locations by qualified personnel.
This device complies with Part 15 of the FCC rules. Operation is subject to the following two
conditions:
1. This device may not cause harmful interference
2. This device must accept any interference received, including interference that may cause
undesired operation.
Changes or modifications not expressly approved by ADTRAN could void the user’s authority
to operate this equipment.
Table 2 shows the compliance codes for the DDM+ HTU-C.
WARNING
Voltages up to –200 VDC with respect to ground may be present on
the HDSL telecommunications conductors. Voltages up to 200
VDC may be present between individual HDSL telecommunications
conductors.
CAUTION
Per GR-1089-CORE the HDSL System is designed and intended for
installation as part of a Common Bonding Network (CBN). The
HDSL System is not designed nor intended for installation as part
of an Isolated Bonding Network (IBN).
Table 2. Compliance Codes
Code Input Output
Power Code (PC) F C
Telecommunication (TC) – X
Installation Code (IC) A –

HDSL DDM+ Transceiver Unit for Central Office Installation and Maintenance Practice
461247003L6-5A
CAUTION
Per GR-1089-CORE Section 9, the DDM+ HTU-C does not have an
internal DC connection between battery return and frame ground.
As such, it may be installed in a DC-I (isolated) or DC-C (common)
installation. For installations where other cards or the host system
have internal connections between battery return and frame
ground, the system would be intended for deployment only in a
DC-C installation.
NOTE
The HDSL port is classified as Type 1, 3, and 5, as defined in
Appendix B of GR-1089-CORE Issue 4, and meets the lightning
and power fault criteria with any primary protector that meets
any of the voltage limits of GR-974-CORE or GR-1361-CORE
(i.e., carbon blocks, gas tubes, solid states, etc.).
NOTE
The DSX-1 port is classified as Type 2 or 4 as defined in Appendix B
of GR-1089-CORE Issue 4, and is suitable for connection to intra-
building or unexposed wiring or cabling only. Do not metallically
connect this port to interfaces which connect to the Outside Plant
(OSP) or to the OSP wiring. The DSX-1 port is designed for use as an
intra-building interface only (Type 2 or Type 4 ports as described in
GR-1089-CORE Issue 4) and requires isolation from exposed OSP
cabling. The addition of Primary Protectors is not sufficient
protection in order to connect this interface metallically to OSP
wiring.
NOTE
Current limiting protectors are not required.
NOTE
The DDM+ HTU-C is designed to operate with a nominal operating
voltage of –48 VDC and a minimum operating voltage of –40 VDC.
The DDM+ HTU-C will not be damaged by any steady state voltage
below –56.7 VDC.

HDSL Deployment Guidelines
61247003L6-5A 5
HDSL DEPLOYMENT GUIDELINES
The ADTRAN HDSL system is designed to provide DS1 based services over loops designed to
comply with carrier service area (CSA) guidelines. CSA deployment guidelines are given below.
• All loops are non-loaded only.
• For loops with 26-AWG cable, the maximum loop length including bridged tap lengths is 9 kft.
• For loops with 24-AWG cable, the maximum loop length including bridged tap lengths is 12 kft.
• Any single bridged tap is limited to 2 kft.
• Total bridged tap length is limited to 2.5 kft.
• The total length of multi-gauge cable containing 26-AWG cable must not exceed the
following:
–12–{(3*L
26)/(9 – LBTAP)} (in kft)
–L
26= Total length of 26-AWG cable excluding bridged taps (in kft)
–L
BTAP= Total length of all bridged taps (in kft)
This deployment criteria is summarized in the chart shown in Figure 2.
Loop loss per kft for other wire is summarized in Table 3.
Figure 2. HDSL Deployment Guidelines
0
12
11
10
9
8
7
6
5
4
3
2
1
0
1234
WORKING LENGTH OF 26 GAUGE CABLE (KFT)
WORKING LENGTH OF 24 GAUGE (OR COARSER) CABLE (KFT)
56789
2.5
INVALID HDSL CABLE LENGTHS
2.0 1.5 1.0 0.5 0.0
TOTAL
BRIDGED
TAP
LENGTH
(KFT)
VALID HDSL CABLE LENGTHS

HDSL DDM+ Transceiver Unit for Central Office Installation and Maintenance Practice
661247003L6-5A
Recommended maximum local loop loss information for PIC cable at 70°F, 135 Ωresistive
termination is provided in Table 4.
An approximation for the maximum amount of wideband noise on an HDSL local loop as
measured by a 50 kb filter is ≤31 dBrn.
An approximation for the maximum level of impulse noise as measured using a 50 kb filter on
an HDSL loop is ≤50 dBrn.
NOTE
These approximations are to be used as guidelines only and may
vary slightly on different loops. Adhering to the guidelines should
produce performance in excess of 10-7 BER.
Table 3. HDSL Loss Values
(200 kHz cable loss in dB/kft at 135 Ω)
Cable Gauge Cable Type Temperature
68° 90° 120°
26 PIC 3.902 4.051 4.253
26 Pulp 4.030 4.179 4.381
24 PIC 2.863 2.957 3.083
24 Pulp 3.159 3.257 3.391
22 PIC 2.198 2.255 2.333
22 Pulp 2.483 2.45 2.629
19 PIC 1.551 1.587 1.634
19 Pulp 1.817 1.856 1.909
Table 4. Loop Insertion Loss Data
Frequency (Hz) Maximum Loss (dB)
3000 12.00
10000 15.00
50000 25.50
100000 30.00
150000 32.75
196000 35.00
200000 32.25
250000 37.50
325000 42.00

Installation
61247003L6-5A 7
INSTALLATION
CAUTION
Electronic modules can be damaged by ESD. When handling
modules, wear an antistatic discharge wrist strap to prevent
damage to electronic components. Place modules in antistatic
packing material when transporting or storing. When working on
modules, always place them on an approved antistatic mat that is
electrically grounded.
After unpacking the DDM+ HTU-C, inspect it for damage. If damage has occurred, file a claim
with the carrier then contact ADTRAN Customer Service. Refer to “Appendix C, Warranty” for
further information. If possible, keep the original shipping container for returning the DDM+
HTU-C for repair or for verification of shipping damage.
Shipping Contents
The contents include the following items:
• HDSL DDM+ Transceiver Unit for Central Office
•HDSL DDM+ Transceiver Unit for Central Office Job Aid (P/N 61247003L6-22)
•HDSL DDM+ Transceiver Unit for Central Office Compliance Notice (P/N 61247003L6-17)
Shelf Population (Based on Power Requirements)
Typically the DDM+ shelf is fused at 10 amps per side (one half of the shelf).
Several DDM+ HTU-Cs can be mixed with other DDM+ standard plug-ins, providing that the
total current draw per shelf side is ≤5 amps. Refer to the original equipment manufacturer’s
specifications for more detail on specific power requirements of these units.
C A U T I O N !
SUBJECT TO ELECTROSTATIC DAMAGE
OR DECREASE IN RELIABILITY.
HANDLING PRECAUTIONS REQUIRED.

HDSL DDM+ Transceiver Unit for Central Office Installation and Maintenance Practice
861247003L6-5A
Instructions for Installing the DDM+ HTU-C
To install the DDM+ HTU-C, perform the following steps:
1. Hold the DDM+ HTU-C by the front panel while supporting its bottom edge to engage the
chassis edge.
2. Align the DDM+ HTU-C edges to fit in the lower and upper guide grooves for the module
slot.
3. Slide the DDM+ HTU-C into the module slot. Simultaneous thumb pressure at the top
(above the STATUS LED) and at the bottom (below the electrostatic caution symbol) of the
DDM+ HTU-C will ensure that it is firmly positioned against the backplane of the chassis.
When the DDM+ HTU-C first powers up it runs the power up self-tests. Once the power up
self-tests are complete, the status LEDs reflect the true state of the hardware.
Front Panel Indicator
The DDM+ HTU-C has one front panel LED which indicates operational status. Table 5
describes this LED.
Table 5. Front Panel LED
Label Status Description
STATUS z
2
z
2
z
2
Green
Green Flashing
Yellow
Yellow Flashing
Red
Red Flashing
Normal operation
ES, SES, or BPV detected
Loopbacks active
In-band loopbacks armed
Alarm on any HTU-C loops, HRE loops, DSX or DS1 interface
Signal margin of 0 or No Sync on the HDSL loops

Installation
61247003L6-5A 9
Provisioning
The provisioning settings can be viewed through the view mode of the front panel Four Character
Display (FCD). For more information on the FCD refer to “Front Panel Operation” on page 12.
The provisioning option settings can be viewed and manipulated through the management
access via the front panel RS-232 port. For more information on access through the RS-232
port, refer to “Control Port Operation” on page 16.
Table 6 lists the available provisioning options, option settings, and default settings.
Table 6. Provisioning Options
Provisioning Option Option Settings Default Setting
DSX 1 LBO 0-133 feet;
133-266 feet;
266-399 feet;
399-533 feet;
533-655 feet;
0-133 feet
Line Code B8ZS;
AMI
B8ZS
DSX-1 Framing Auto;
UNF
UNF
NIU Loopback Enabled;
Disabled
Enabled
LBTO None;
1 hr;
2 hr;
8 hr;
24 hr
1 hr
CLOS AIS;
LBK
AIS
DS1 TX LVL 0 dB;
–15 dB
0 dB
PRM None;
NPRM;
SPRM;
Auto
Auto
HTU-C Shelf Alarm Enabled;
Disabled
Enabled
Span Power Enabled;
Disabled
Enabled

HDSL DDM+ Transceiver Unit for Central Office Installation and Maintenance Practice
10 61247003L6-5A
CONNECTIONS
The DDM+ HTU-C occupies one card slot in a DDM+ shelf. Power and alarm signals are
provided to the card through the backplane of the shelf. DSX-1 and HDSL loop signals are
connected to the shelf connector and transmitted to the corresponding slot the unit occupies.
Refer to Figure 3 for DDM+ HTU-C edge connection wiring.
Figure 3. DDM+ HTU-C Edge Connector Wiring
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
LP1 Tip
LP1 Ring
HDSL Loops 1 and 2 are full duplex
loops — capable of simultaneously
transmitting and receiving data.
LP2 Tip
LP2 Ring
DSX-1 Rx Tip
DSX-1 Rx Ring
DSX-1 Tx Tip
DSX-1 Tx Ring
Alarm (to Alarm Module)
-48V Return
Frame Ground
-48V
-48V Return
-48V Return

Connections
61247003L6-5A 11
The DDM+ HTU-C is capable of span powering the HTU-R by applying simplex current to the
local loop. From 30 mA to 155 mA of current is coupled onto the HDSL span to power the
HTU-R and HRE when deployed. The span powering voltage can be configured to be –190
volts with Loop 1 providing the negative voltage and Loop 2 the return (Figure 4).
Figure 4. DDM+ HTU-C Span Powering Diagram
Alarm Connections
The following alarm signal is connected to the DDM+ Alarm Module:
•Pin 117
• Label LOS and Fuse Alarm
• Function Loss of signal and fuse alarm of –48 V supply
Alarm processing is actually performed by the DDM+ Alarm Module. Refer to the DDM+ Alarm
module documentation for further information.
Alarm conditions are not reported at the DDM+ HTU-C until the HDSL circuit is terminated by
connecting an HTU-R. This allows circuit pack pre-provisioning. Once the DDM+ HTU-C is
terminated with an HTU-R, the unit will go into an in-service state.
SPAN POWER
REGULATOR
T (101)
R (102)
T1 (105)
R1 (106)
LOOP 1
LOOP 2
2B1Q
HDSL SPAN CURRENT

HDSL DDM+ Transceiver Unit for Central Office Installation and Maintenance Practice
12 61247003L6-5A
FRONT PANEL OPERATION
The front panel interface consists of an alphanumeric LED Four Character Display (FCD) and
two pushbuttons, MODE and SELECT, that control the FCD. Pressing the MODE pushbutton cycles
through the FCD modes listed in Table 7. The FCD is used to report the loop margins (dB),
and other operational conditions. In addition, the FCD is used to reset unit configuration
defaults and control loopbacks. The FCD and front panel pushbuttons are illustrated in
Figure 5.
Figure 5. Front Panel Four Character Display and Pushbuttons
Table 7. Four Character Display Modes
Mode Display Function
Status STAT This mode displays HDSL loop margins, for detailed information, refer to
the “Status/Alarm Mode” section of this practice on page 13.
Display Off Blank This mode results after five minutes of no activity, for detailed
information, refer to the “Display Off Mode” section of this practice on
page 13.
View VIEW This mode displays current option settings without the ability to change
them, for detailed information, refer to the “View Mode” section of this
practice on page 14.
Default DFLT This mode resets all factory defaults, for detailed information, refer to the
“Default Mode” section of this practice on page 15.
Loopback LPBK This mode selects and executes HDSL circuit loopbacks, for detailed
information, refer to the “Loopback Mode” section of this practice on
page 15.