ADTRAN DDM+ H2TU-C Instruction Manual

161222003L1-5, Issue 161222003L1-5A
Section 61222003L1-5A
Issue 1, July 2001
CLEI # T1L3Y1BA _ _
DDM+ H2TU-C with Display
2-Wire HDSL (HDSL2)
Transceiver Unit for the Central Office
Installation and Maintenance
Trademarks: Any brand names and product names included in this document are
trademarks, registered trademarks, or trade names of their respective holders.
1. GENERAL
The ADTRAN DDM+ HDSL2 Transceiver Unit for
the Central Office (H2TU-C) ith Display,
P/N 1222003L1, is the Central Office (CO) unit used
to deploy an HDSL2 T1 circuit using t o- ire
metallic facilities. The unit occupies one slot in an
AT&T® DDM+ DS1 Extension shelf. The unit is
illustrated in Figure 1.
Revision History
This is the initial release of this document. Future
revisions to this document ill be explained in this
subsection.
CONTENTS
1. GENERAL ........................................................................ 1
2. INSTALLATION ............................................................. 2
3. CONNECTIONS .............................................................. 3
4. HDSL2 SYSTEM TESTING ........................................... 4
5. FRONT PANEL OPERATION ...................................... 4
6. CONTROL PORT OPERATION .................................... 7
7. HDSL2 DEPLOYMENT GUIDELINES.......................18
8. TROUBLESHOOTING PROCEDURES ...................... 19
9. MAINTENANCE ........................................................... 19
10. PRODUCT SPECIFICATIONS ..................................... 19
11. WARRANTY AND CUSTOMER SERVICE ............... 19
Appendix A. HDSL2 Loopbacks ....................................... A-1
Appendix B. Shelf Configuration .......................................B-1
FIGURES
Figure 1. ADTRAN DDM+ H2TU-C with Display ............ 1
Figure 2. H2TU-C Edge Connector Wiring ......................... 3
Figure 3. H2TU-C Span Powering Diagram ........................ 3
Figure 4. HDSL2 Loopbacks ................................................ 4
Figure 5. RS-232 (DB-9) Pin Assignments .......................... 7
Figure 6. HDSL2 Main Menu Screen ................................... 8
Figure 7. HDSL2 Unit Information Screen .......................... 9
Figure 8. Provisioning Screen .............................................. 9
Figure 9. Span Status Screen .............................................. 10
Figure 10. Detailed Status Screen ........................................ 10
Figure 11. Loopback and Test Commands Screen ............... 11
Figure 12. 15-Minute Performance History Path Data
Screen .................................................................. 12
Figure 13. 60-Minute Performance History Line Data
Screen .................................................................. 13
Figure 14. 24-Hour Performance History Line Data Screen 13
Figure 15. Performance History Data Definitions Screen ... 14
Figure 16. Performance History Data Definitions Screen
(Continued) .......................................................... 14
Figure 17. Circuit ID, Time/Date Screen ............................. 15
Figure 18. Terminal Modes Screen ...................................... 16
Figure 19. Alarm History Screen ..........................................17
Figure 20. Event History Screen .......................................... 17
Figure 21. Deployment Guidelines ....................................... 18
TABLES
Table 1. Faceplate Indicators ............................................... 2
Table 2. Compliance Codes ................................................. 2
Table 3. Status Condition and Alarm Messages .................. 5
Table 4. Option Setting Parameters ..................................... 6
Table 5. HDSL2 Loopback Options .................................... 7
Table 6. Screen Abbreviations Defined ...............................7
Table 7. HDSL2 Loss Values ............................................. 18
Table 8. Loop Insertion Loss Data ..................................... 18
Table 9. Troubleshooting Guide ........................................ 19
Table 10. DDM+ H2TU-C Specifications ........................... 20
Table A-1. HDSL2 Loopback Control Codes ..................... A-2
Table A-2. In-Band Addressable Loopback Codes ............ A-3
Figure 1. ADTRAN DDM+ H2TU-C with
Display
1222003L1
STATUS
MODE SELECT
M
A
R
G
I
N
d
B
R
S
2
3
2
H
D
S
L

2 61222003L1-5, Issue 1 61222003L1-5A
C A U T I O N !
SUBJECT TO ELECTROSTATIC DAMAGE
OR DECREASE IN RELIABILITY.
HANDLING PRECAUTIONS REQUIRED.
Description
DSX-1 signals are provided to and received from the
net ork hile HDSL2 signals are provided to the
local loop. The ADTRAN H2TU-C orks in
conjunction ith the ADTRAN H2TU-R to provide a
DS1 service up to 12,000 feet on the local loop.
This H2TU-C orks ith multiple list versions of the
HDSL2 Unit for the Remote end (H2TU-R) some of
hich are listed belo :
Part Number Description
1221026LX ........... T200 H2TU-R
1222026LX ........... 2nd Gen T200 H2TU-R
The H2TU-C can be deployed in circuits consisting of
one H2TU-C and one H2TU-R.
System po er and alarm bus connections are made
through the backplane of the DDM+ shelf. DSX-1 and
HDSL2 signals are connected through ire- rap pins
related to each individual slot on the rear of the shelf.
The H2TU-C contains an onboard fuse. If the fuse
opens, it supplies a -48 VDC voltage to the fuse alarm
bus and all Faceplate indicators turn Off. The fuse is
not designed to be replaced in the field.
The H2TU-C uses a DC-to-DC converter to derive its
internal logic and span po ering voltages from the
-48 VDC office supply. Span po ering voltages meet
all requirements of Class A2 voltages as specified by
Bellcore GR-1089-CORE.
2. INSTALLATION
After unpacking the unit, inspect it for damage. If
damage is noted, file a claim ith the carrier, then
contact ADTRAN. See Warranty and Customer
Service.
The H2TU-C plugs directly into the AT&T DDM+ shelf.
The unit may be plugged into any of the 28 slots of
the DDM+ shelf. No installation iring is required.
Faceplate Indicators
The H2TU-C has one faceplate LED hich indicates
operational status. Table 1 defines this LED.
Compliance Codes
CAUTION
Voltages up to -200 VDC may be present on the
telecommunications iring.
CAUTION
The DSX-1 connections should be connected to
intra-building iring only.
Table 2 sho s the Compliance Codes for the DDM+
H2TU-C ith Display. The DDM+ H2TU-C ith
Display complies ith the requirements covered under
UL 60950, Third Edition, and is intended to be
installed in an enclosure ith an Installation Code
(IC) of “B” or “E.”
NOTE
This product is intended for installation in
Restricted Access ocations only.
Table 1. Faceplate Indicators
ED Description Indication
STATUS ..... Blinking Red .......... Signal Quality of 0 or No
Sync on the HDSL2 loop
Solid Red ................ Alarm on the HDSL2 loop,
DSX, or DS1
Blinking Amber...... In-band loopbacks armed
Solid Amber ........... Loopbacks active
Blinking Green ....... ES, SES, or BPV occurred
Solid Green............. Everything functioning OK
Code Input Output
Installation Code (IC) A –
Telecommunication Code (TC) – X
Power Code (PC) F C
Table 2. Compliance Codes

361222003L1-5, Issue 161222003L1-5A
Powering Modes
The H2TU-C ill automatically provide span
po ering voltage. No voltage settings are required,
regardless of the presence of a H2R.
Shelf Population
(based on power requirements)
Typically, the AT&T DDM+ shelf is fused at 10 amps
per side (one half of the shelf). A orksheet for
calculating the maximum number of DDM+ H2TU-Cs
allo ed in the AT&T DDM+ Shelf is located in
Appendix B of this practice.
Several H2TU-C s can be mixed ith other DDM+
standard plug-ins, providing that the total current dra
per shelf side is less than or equal to 5A. Refer to the
original equipment manufacturer’s specifications for
more detail on specific po er requirements of these
units.
3. CONNECTIONS
The DDM+ H2TU-C occupies one card slot in an
AT&T DDM+ shelf. Po er and alarm signals are
provided to the card through the backplane of the
shelf. DSX-1 and HDSL2 loop signals are connected
to the ire- rap pins or mass termination shelf
connectors corresponding to the slot the unit occupies.
See Figure 2 for H2TU-C edge connection iring.
The H2TU-C is capable of span po ering the
H2TU-R by applying simplex current to the local
loop. From 10 to 150 mA of current is coupled onto
the HDSL2 span to po er the H2TU-R hen
deployed (see Figure 3).
H2TU-C Alarm Outputs
Pin 117 of the H2TU-C edge connector interface
provides a fuse alarm signal that connects -48 VDC to
this pin in the presence of a blo n fuse or loss of
signal. This indicates the card has malfunctioned and
should be replaced.
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+
H2TU-C until the HDSL2 circuit is terminated, by
connecting an H2TU-R. This allo s circuit pack
pre-provisioning. Once the HT2U-C is terminated
ith an H2TU-R, the unit ill go into an in-service
state.
Figure 2. H2TU-C Edge Connector Wiring
Figure 3. H2TU-C Span Powering Diagram
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
HDSL2 Tip
HDSL2 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
-48 V Return
-48 V Return
HDSL2
TIP (+)
RING (-)
SPAN POWER 190V
SPAN CURRENT
(101)
(102)

4 61222003L1-5, Issue 1 61222003L1-5A
4. HDSL2 SYSTEM TESTING
The ADTRAN HDSL2 system provides the ability to
monitor the status and performance of the DSX-1
signals, DS1 signals, and HDSL2 loop signals.
Detailed performance monitoring is provided by the
faceplate mounted RS-232 Control Port. These
features are valuable in troubleshooting and isolating
any system level problems that may occur at
installation or during operation of the HDSL2 system.
The follo ing subsections describe additional testing
features.
H2TU-C Loopbacks
The H2TU-C responds to three different loopbacks.
The first of hich may be activated using the craft
interface. The Loopback Options Screen hich
provides for the H2TU-C and H2TU-R loopbacks is
described in Section 6 of this practice.
Second, the H2TU-C responds to the industry defacto
standard for HDSL2 loopbacks. A detailed
description of these loopback sequences is given in
Appendix A.
Third, the H2TU-C responds to loopbacks initiated
using the operational display located on the faceplate
of the unit. See Section 5 of this practice for details.
This unit contains smartloop technology. That is, if
the unit is optioned to operate in Auto Frame mode, it
constantly monitors the DSX-1 for a framing pattern.
In Auto Frame mode, the unit ill initiate the proper
loopback regardless of ho the loopback control
sequence is sent (framed or unframed). With the
framing mode set to ESF, SF, or Unframed, the
loopback control code must match the framing format.
The loopback condition imposed in both cases is a
logic level loopback at the point ithin the H2TU-C
here the DSX-1 signal passes into the HDSL2
modulators. Figure 4 depicts all of the loopback
locations possible ith ADTRAN HDSL2 equipment.
In addition to net ork-side loopbacks, the H2TU-C
provides customer-side loopbacks initiated by using
either the terminal control port or in-band loop codes
(see Appendix A). In this mode, an AIS signal is
supplied to the net ork.
DSX-1
H2TU-C
LOCAL
LOOP
H2TU-C Network-Side Loopback
H2TU-R
H2TU-C
LOCAL
LOOP
H2TU-R Customer-Side Loopback
H2TU-R
H2TU-C
LOCAL
LOOP
H2TU-C Customer-Side Loopback
H2TU-R
X
X
DS1
DSX-1
H2TU-C
LOCAL
LOOP
H2TU-R Network-Side Loopback or
H2TU-R NIU Loopback
H2TU-R
X
DS1
DS1
DS1
X
AIS
AIS
AIS
X = Signal Inactive
D = Data Sent
H2TU-C
LOCAL
LOOP
H2TU-R Bidirectional Loopback
DS1DSX-1
H2TU-R
(Metallic)
X
Figure 4. HDSL2 Loopbacks
5. FACEPLATE OPERATION
The Faceplate interface consists of a four-character
alphanumeric LED display and t o pushbuttons that
control the display. The mode button toggles bet een
the available options, and the select button allo s the
user to choose an option.
The display is used to report the loop margin (dB),
and other operational conditions. In addition, the
display can be used to modify unit configuration and
control loopbacks.

561222003L1-5, Issue 161222003L1-5A
Status Mode
The display enters Status mode after po er up or a
reset. It scrolls “ADTRAN HDSL2” and then
alternately displays loop margin for the HDSL2 loop,
any active alarm condition, and general status
conditions.
The HDSL2 loop margin is displayed ith the
message “MARG” then “xx,” here “xx” is the
HDSL2 loop margin (0-20). The loop margin is held
on the display for t o seconds. The loop margin ill
not be displayed if the loop is in startup or DSL LOS
condition.
If any of the conditions listed in Table 3 are present,
the messages for those conditions ill be displayed
for t o seconds each after the loop margins.
Display Off Mode
The display enters Display Off Mode from Status
Mode after five minutes ith no activity on the
display button. While in this mode, the display is
completely Off.
The display ill return to Status Mode under the
follo ing conditions:
• Either MODE or SELECT is activated.
• A message other than loop margin is to be
displayed.
Faceplate
Display Message Condition
DSL ERR ...................... CRC error detected on HDSL2 Loop
LOC ERR ..................... Frame bit error (SF Mode), Bipolar Violation (BPV), or CRC error (ESF Mode) detected locally at
DSX-1 of the H2TU-C
REM ERR .................... Frame bit error (SF Mode), Bipolar Violation (BPV), or CRC error (ESF Mode) detected remotely
at DS-1 of the H2TU-R
DSL LOS ...................... No synchronization of H2TU-C and H2TU-R on loop
LOC LOS ..................... DSX signal is absent from the net ork interface or is of a format hich does not match the
provisioning of the HDSL2 circuit.
REM LOS ..................... DS1 signal is absent from the net ork interface or is of a format hich does not match the
provisioning of the HDSL2 circuit.
ARM ............................. NIU Loopback is armed
Table 3. Status Condition and Alarm Messages
Provisioning, View, Default, and Loopback
Mode
The provisioning, vie , default, or loopback mode is
entered from the Status Mode after the MODE button
is acticated. As soon as the MODE button is activated
the display message ill cycle through to “STAT,”
“PROV,” “VIEW,” “DFLT,” and “LPBK.”
Activating the button to the SELECT position ill
cause one of these modes to be entered.
NOTE
At any point in the menu tree, holding the
MODE button for three seconds ill cause the
display to go back one level in the menu tree.
Provisioning Mode
In this mode, the display alternates bet een the
selected configuration parameters and the current
setting for that parameter. Press the SELECT button
to choose the option to be changed. The current
setting ill appear on the display. Use the MODE
button to scroll through the possible settings. After the
desired setting appears, press SELECT to choose that
setting. The message “SAVE” ill appear on the
display follo ed by the default response “NO.” If
you ish to revert to the original setting, then press
the SELECT button. If you ish to choose the ne
setting, then press the MODE button. The message
“YES” ill appear, then press the SELECT button to
choose the ne setting. The display ill return to
alternating bet een the option name and the current
setting for that option. Use the MODE button to scroll
through the remaining options.

6 61222003L1-5, Issue 1 61222003L1-5A
The configuration parameters available in the
Provisioning Mode are described in Table 4.
View Mode
Select the VIEW mode to scroll through each option
setting ithout changing any of the parameters. (This
information is useful in verifying the current settings
of the HDSL2 circuit.) A listing of the circuit
parameters appears in Table 4. Each option ill flash
follo ed by the current setting. The display ill
return to “VIEW” mode after scrolling through each
of the options. To exit “VIEW” mode, press the
MODE button for three seconds. If connected to
H2TU-Rs ith hard are s itches the “VIEW” mode
ill also display these settings.
Default Mode
The DFLT mode can be used to enable all of the
factory-default HDSL2 circuit configuration
parameters. Once in this mode, you ill be prompted
to select the factory defaults or not by entering “YES”
or “NO,” respectively. Use the MODE button to
toggle bet een “YES” and “NO,” if necessary. If the
SELECT button is pressed hile the display reads
“YES,” then the factory defaults ill be enabled and
the message “DONE” ill appear. If the SELECT
button is pressed hile the display reads “NO,” then
the unit ill retain the current settings.
Loopback Mode
This mode selects and executes HDSL2 circuit
loopbacks. Only one loopback may be active at a
time. From the top level of the display, press the
“MODE” to scroll to “LPBK.” Press the “SELECT”
button to force the display into the loopback branch.
Use the MODE button to scroll through the different
HDSL2 system units on the circuit, hich may
include H2TU-C and H2TU-R. The display ill
toggle bet een the unit name and the current loopback
state of that unit. The choices are NONE, NET
(loopback to ard the net ork) and CST (loopback
to ard the customer).
To change the loopback state of a particular unit, first
press the “SELECT” button hen the appropriate
HDSL2 system unit appears. The unit’s current
loopback state ill be displayed. Use the “MODE”
button to scroll through the available choices. Once
the desired choice appears, use the “SELECT” button
to activate the choice. Press and hold the “MODE”
button for three seconds to return to the top level of
the display. Available loopbacks are described in
Table 5.
1 The forced frame format conversion (FFFC) mode sets the H2TU-C to ESF and the H2TU-R to SF. This mode should be used to force SF (DS1
from customer) to ESF (DSX-1 to net ork) conversion in the absence of net ork-provided ESF framing.
2 When operating in FT1 mode and during periods of T1 loss of signal, LOS, or T1 AIS from the customer CI, the HDSL2 system ill send in the
net ork direction from the H2TU-C a Fractional DS1 idle signal consisting of a repeating 7E (HEX) byte payload ithin a framed/unframed T1
signal. In addition, hen optioned for FT1 mode, the setting for Customer Loss Response is ignored.
* These are not changeable from the Four Character Display.
Table 4. Option Setting Parameters
Faceplate
Display Message Description Settings Default
LBO .................................. Line Build Out ............................................. 0, 133, 266, 399, 533 ................................... 0
CODE ............................... Line Code ..................................................... AMI, B8ZS ................................................... B8ZS
FRMG ............................... DSX-1 Framing ............................................ AUTO, ESF, SF, UNF, FFFC 1................... AUTO
NLBK ............................... NIU Loopback .............................................. EN, DIS ........................................................ EN
NELB ................................ Ne England 1:6 Loopback ........................ EN, DIS ........................................................ DIS
LBTO ................................ Loopback Time Out ..................................... NONE, 20, 60, 120 ...................................... 120
CLOS ................................ Customer Loss Response ............................. AISC, AIS, LPBK ........................................ AISC
LTCH ................................ Latching Loopback ...................................... T1, FT1 2....................................................... T1
PRM .................................. Performance Reporting Message ................. NONE, SPRM, NPRM ................................ NONE
TXLV ............................... DS1 Transmit Level ..................................... 0 dB, -7.5 dB, -15 dB ................................... -7.5 dB
SALM ............................... Shelf Alarm .................................................. EN, DIS ........................................................ EN
SPWR ............................... Span Po er ................................................... EN, DIS ........................................................ EN
* ........................................ Loop Attenuation Alarm Threshold ............ 0 (Disabled), 1-99 ........................................ 40 dB
* ........................................ SNR Margin Alarm Threshold .................... 0 (Disabled), 1-15 ........................................ 04 dB

761222003L1-5, Issue 161222003L1-5A
6. CONTROL PORT OPERATION
The H2TU-C provides a faceplate-mounted DB-9
connector that supplies an RS-232 interface for
connection to a controlling terminal. The pinout of
the DB-9 is illustrated in Figure 5.
The terminal interface operates at data rates from 1.2
kbps to 19.2 kbps. The asynchronous data format is
fixed at 8 data bits, no parity, and 1 stop bit. The line
rap feature of emulation programs should also be
displayed.
The H2TU-C supports t o types of terminal
emulation modes. The Manual Update Mode is a
dumb terminal mode, here the user can use print
screen and log files commands easily. This mode also
includes a “3 SPACES TO UPDATE” message on the
top of the terminal screen (press the space bar 3 times
to update the screen).
The Real Time Update Mode is a VT100 terminal
mode. This mode enables all screen highlighting and
cursor placement. Print screen and log file commands
are not available in this mode.
The default terminal mode is Real Time Update.
NOTE
If you are using a personal computer (PC) ith
terminal emulation capability, be sure to disable
any po er saving programs. Other ise,
communication bet een the PC and the HDSL2
unit may be disrupted, resulting in misplaced
characters or screen time outs.
Operation
For abbreviations used in the screen diagrams, see
Table 6. The Performance Data Definitions Screen
also offers a listing of screen definitions by selecting
“1” from the screen definitions.
6
7
8
9
1
2
3
4
5
TXD (Transmit Data)
RXD (Receive Data)
SGN (Signal Ground)
Figure 5. RS-232 (DB-9) Pin Assignments
Table 5. HDSL2 Loopback Options
Faceplate Display Message
oopback
Mode Select State Description
LPBK ... HTUC .... NET ....... Net ork loopback at the H2TU-C
CST ........ Customer loopback at the H2TU-C
NONE .... No active loopback
HTUR .... BLB ....... Bilateral loopback at the H2TU-R
NET ....... Net ork loopback at the H2TU-R
CST ........ Customer loopback at the H2TU-R
NONE .... No active loopback
Table 6. Screen Abbreviations
Abbreviation Definition
NET ............................. Net ork (DSX-1)
CUST ........................... Customer (DS1)
ATTEN ........................ Pulse Attenuation
LOS ............................. Loss of Signal
SF ................................. Superframe format
ESF .............................. Extended Superframe format
B8ZS ............................ Bipolar ith 8 Zero Substitution
AMI ............................. Alternate Mark Inversion
LBO ............................. Line Build Out
BPV ............................. Bipolar Violation
NIU .............................. T1 Net ork Interface Unit
S/N ............................... Serial Number
15M ............................. Fifteen-Minute period
60M ............................. Sixty-Minute period
24H .............................. T enty-Four-Hour period
The screens illustrated in Figure 6 through Figure 23
apply to an HDSL2 circuit deployed ith ADTRAN’s
HDSL2 technology. The circuit includes an H2TU-C
and an H2TU-R. Other configurations are possible
(i.e., other vendor’s equipment) and their displays ill
vary slightly from those sho n in this section.

8 61222003L1-5, Issue 1 61222003L1-5A
A terminal session is initiated by entering multiple
space bar characters, hich are used by the H2TU-C
to determine the speed of the terminal. Once the
speed has been determined, an HDSL2 Main Menu is
presented, as illustrated in Figure 6.
The Main Menu provides access to detailed
performance and configuration information. Selecting
the corresponding number ill access the follo ing
screens:
1. HDSL2 Unit Information
2. Provisioning
3. Span Status
4. Loopbacks and Test
5. Performance History
6. Circuit ID, Time/Date
7. Terminal Modes
8. Alarm History
9. Event History
Figure 6. HDSL2 Main Menu Screen
CIRCUIT ID: 01/01/00 00:03:05
Adtran HDSL2 Main Menu
1. HDSL2 Unit Information
2. Provisioning
3. Span Status
4. Loopbacks and Test
5. Performance History
6. Circuit ID, Time/Date
7. Terminal Modes
8. Alarm History
9. Event History
Selection:

961222003L1-5, Issue 161222003L1-5A
The HDSL2 Unit Information Screen, illustrated in
Figure 7 provides detailed product information on
each component in the HDSL2 circuit. This screen
also displays contact information for ADTRAN
Technical Support, Internet site and address.
Figure 8. Provisioning Screen
CIRCUIT ID: 01/01/00 00:03:51
Press ESC to return to precious menu
Provisioning
1. DSX-1 Line Buildout = 0-133 Feet
2. DSX-1/DS1 Line Code = B8ZS
3. DSX-1/DS1 Framing = Auto
4. NIU Loopback = Enabled
5. NEW ENGLAND 1:6 LPBK = Disabled
6. Loopback Timeout = 120 Min
7. Latching Loopback Mode = T1 (Disabled)
8. DS1 TX Level = -7.5 dB
9. Span Power = Enabled
10. Customer Loss Indicator = AIS / CI
11. PRM Setting = None
12. Loop Atten Alarm Thres = 40dB
13. SNR Margin Alarm Thres = 04dB
Selection:
CIRCUIT ID: 01/01/00 00:03:23
Press ESC to return to precious menu
ADTRAN
901 Explorer Boulevard
Huntsville, Alabama 35806-2807
--------------------- For Information or Technical Support ---------------------
Support Hours ( Normal 7am - 7pm CST, Emergency 7 days x 24 hours )
Phone: [phone] / 888.873.HDSL Fax: [phone] Internet: www.adtran.com
--------------------------------------------------------------------------------
ADTN H2TU-C ADTN H2TU-R
List: 1 List: 1
S/N: DA26D3779 S/N: 123456789
CLEI: T1L3Y1BAAA CLEI: T1L3RVTAAA
Manf: 08/31/2000 Manf: 01/01/2000
Figure 7. HDSL2 Unit Information Screen
The Provisioning Screen, illustrated in Figure 8,
displays the current provisioning settings for the
HDSL2 circuit. To change a particular option setting,
select the appropriate number and a ne menu ill
appear ith a list of the available settings.

10 61222003L1-5, Issue 1 61222003L1-5A
The Span Status Screen, illustrated in Figure 9,
provides quick access to status information for each
HDSL2 receiver in the circuit. The legend selection
provides a description of the messages that are used
on the Span Status screens.
The Detailed Status selection from the Span Status
Menu, illustrated in Figure 10, displays the HDSL2
and T1 status for each receiver point. From this
screen, all registers can be zeroed, hich requires
confirmation and min/max can be reset.
CIRCUIT ID: 01/01/00 00:04:23
Press ESC to return to precious menu
Span Status Screen
ATTEN
______ <-29dB-> ______
|H2TUC | |H2TUR |
<------| | | |------>
| | | |
NET | | <------> | | CUST
| |09dB 10dB| |
------>| | MARGIN | |<------
DSX-1 |______| |______| DS1
1. Legend
2. Detailed Status
Selection:
Figure 9. Span Status Screen
CIRCUIT ID: 01/01/00 00:04:53
Press ESC to return to precious menu
Detailed HDSL2 and T1 Status
HDSL2 RECEIVER DATA
H2TU-C H2TU-R
-------- --------
MARGIN(CUR/MIN/MAX): 08/00/10 11/00/12
ATTEN(CUR/MAX): 29/93 29/29
ES 15MIN: 010 000
SES 15MIN: 000 000
UAS 15MIN: 041 814
T1 RECEIVER DATA
DSX-1 DS1
------- -------
FRAMING: AUTO AUTO
LINE CODE: B8ZS B8ZS
ES-P/ES-L: 000/001 000/008 1. Zero Registers
SES-P/SES-L: 000/001 000/008 2. Restart Min/Max
UAS-P/UAS-L: 000/000 822/000
ALARMS: NONE NONE Selection:
Figure 10. Detailed Status Screen

1161222003L1-5, Issue 161222003L1-5A
Figure 11 illustrates the Loopback and Test
Commands Screen, hich provides the user ith the
ability to evoke or terminate all available HDSL2
loopbacks. Each HDSL2 circuit component can be
looped to ard the net ork or customer from this
screen. It also provides a self-test option to perform a
self-diagnostic of the H2TU-C and H2TU-R.
CIRCUIT ID: 01/01/00 00:05:12
Press ESC to return to precious menu
Loopback and Test Commands
______ ______
|H2TUC | |H2TUR |
<------| | | |------>
| | | |
NET | |<--------->| | CUST
| | | |
------>| | | |<------
DSX-1 |______| |______| DS1
1. Run Self Tests
2. H2TU-C Loopup Network
3. H2TU-C Loopup Customer
4. H2TU-R Loopup Network
5. H2TU-R Loopup Customer
Selection:
Figure 11. Loopback and Test Commands Screen

12 61222003L1-5, Issue 1 61222003L1-5A
The Performance History Screen, illustrated in Figure
12, Figure 13, and Figure 14, displays the historical
HDSL2 and T1 performance data in several different
registers. At each 15-minute interval, the performance
information is transferred to the 15-minute
performance data register. This unit stores
performance data in 15-minute increments for the last
24-hour period. Additionally, some units store up to
48 hours orth of 60-minute interval data. At each
24-hour interval, the performance data is transferred
into the 24-hour performance data registers. This unit
stores up to 31 days of 24-hour interval data.
The user is prompted to select a module and interface
to vie the corresponding performance data. Line (L)
and Path (P) data can be ie ed.
CIRCUIT ID: 01/01/00 00:06:47
Press ESC to return to precious menu
Menu 15 Minute H2TUC DSX-1 Performance Data
1. Definitions ES-P SES-P UAS-P SAS-P ES-PFE CV-P
2. Reset Data 000 000 000 000 000 00000
3. 15 Min Data 00:00 000 000 000 000 000 00000
4. 60 Min Data 23:45 000 000 000 000 000 00000
5. 24 Hr Data 23:30 000 000 000 000 000 00000
6. Line Data 23:15 000 000 000 000 000 00000
7. Path Data 23:00 000 000 000 000 000 00000
8. H2TUC DSX-1 22:45 000 000 000 000 000 00000
9. H2TUC LOOP 22:30 000 000 000 000 000 00000
10. H2TUR LOOP 22:15 --- --- --- --- --- -----
11. H2TUR DS1 22:00 --- --- --- --- --- -----
21:45 --- --- --- --- --- -----
21:30 --- --- --- --- --- -----
21:15 --- --- --- --- --- -----
Selection:
Figure 12. 15-Minute Performance History Path Data Screen
_ _ _ _ _ _
--8-->| | | |---->
| C |<-9--10->| R |
<-----|_ _ _| |_ _ _|<-11-

1361222003L1-5, Issue 161222003L1-5A
CIRCUIT ID: 01/01/00 00:07:07
Press ESC to return to precious menu
Menu 60 Minute H2TUC DSX-1 Performance Data
1. Definitions ES-L SES-L UAS-L PDVS-L B8ZS-L CV-L
2. Reset Data 0001 0001 0000 0002 0427 00000
3. 15 Min Data 01/01 00:00 1800 1800 1800 0000 0000 00000
4. 60 Min Data 12/31 23:00 ---- ---- ---- ---- ---- -----
5. 24 Hr Data 12/31 22:00 ---- ---- ---- ---- ---- -----
6. Line Data 12/31 21:00 ---- ---- ---- ---- ---- -----
7. Path Data 12/31 20:00 ---- ---- ---- ---- ---- -----
8. H2TUC DSX-1 12/31 19:00 ---- ---- ---- ---- ---- -----
9. H2TUC LOOP 12/31 18:00 ---- ---- ---- ---- ---- -----
10. H2TUR LOOP 12/31 17:00 ---- ---- ---- ---- ---- -----
11. H2TUR DS1 12/31 16:00 ---- ---- ---- ---- ---- -----
12/31 15:00 ---- ---- ---- ---- ---- -----
12/31 14:00 ---- ---- ---- ---- ---- -----
12/31 13:00 ---- ---- ---- ---- ---- -----
Selection:
Figure 13. 60-Minute Performance History Line Data Screen
CIRCUIT ID: 01/01/00 00:07:40
Press ESC to return to precious menu
Menu 24 Hour H2TUC DSX-1 Performance Data
1. Definitions ES-L SES-L UAS-L PDVS-L B8ZS-L CV-L
2. Reset Data 04497 04497 04496 00002 00460 0000000
3. 15 Min Data 12/31 ----- ----- ----- ----- ----- -------
4. 60 Min Data 12/30 ----- ----- ----- ----- ----- -------
5. 24 Hr Data 12/29 ----- ----- ----- ----- ----- -------
6. Line Data 12/28 ----- ----- ----- ----- ----- -------
7. Path Data 12/27 ----- ----- ----- ----- ----- -------
8. H2TUC DSX-1 12/26 ----- ----- ----- ----- ----- -------
9. H2TUC LOOP 12/25 ----- ----- ----- ----- ----- -------
10. H2TUR LOOP 12/24 ----- ----- ----- ----- ----- -------
11. H2TUR DS1 12/23 ----- ----- ----- ----- ----- -------
12/22 ----- ----- ----- ----- ----- -------
Selection:
Figure 14. 24-Hour Performance History Line Data Screen
_ _ _ _ _ _
--8-->| | | |---->
| C |<-9--10->| R |
<-----|_ _ _| |_ _ _|<-11-
_ _ _ _ _ _
--8-->| | | |---->
| C |<-9--10->| R |
<-----|_ _ _| |_ _ _|<-11-

14 61222003L1-5, Issue 1 61222003L1-5A
Abbreviations used in the Performance History
Screens are defined in Data Definitions Screens, see
Figure 15 and Figure 16.
Figure 15. Performance History Data Definitions Screen
CIRCUIT ID: 01/01/00 00:05:46
Press ESC to return to precious menu
Performance Data Definitions
H2TUC, H2TUR, and H2R LOOP Related: HDSL2 Framing
ES-L Errored Seconds CRC>=1 or LOSW>=1
SES-L Severely Errored Seconds CRC>=50 or LOSW>=1
UAS-L Unavailable Seconds >10 cont. SES-Ls
DS1 and DSX-1 Line Related: Superframe and Extended Superframe
ES-L Errored Seconds (BPV+EXZ)>=1 or LOS>= 1
SES-L Severely Errored Seconds (BPV+EXZ)>=1544 or LOS>=1
UAS-L Unavailable Seconds >10 cont. SES-Ls
PDVS-L Pulse Density Violation Secs EXZ>=1; >7 zeros if B8ZS, >15 if AMI
B8ZS-L B8ZS Seconds B8ZS coded signal received
CV-L Code Violation Count (BPV+EXZ) count
NOTE: Reverse video indicates invalid data due to a terminal restart (or power
cycle), a data register reset, or a system date or time change.
N. Next
P. Previous Selection:
Figure 16. Performance History Data Definitions Screen (Continued)
CIRCUIT ID: 01/01/00 00:06:01
Press ESC to return to precious menu
Performance Data Definitions
DS1 and DSX-1 Path Related: Superframe Extended Superframe
ES-P Errored Seconds FE>=1 or CRC>=1 or
SEF>=1 or AIS>=1 SEF>=1 or AIS>=1
SES-P Severely Errored Seconds FE>=8 or CRC>=320 or
SEF>=1 or AIS>=1 SEF>=1 or AIS>=1
UAS-P Unavailable Seconds >10 cont. SES-Ps >10 cont. SES-Ps
SAS-P SEF/AIS Seconds SEF>=1 or AIS>=1 SEF>=1 or AIS>=1
ES-PFE Far End Errored Seconds n/a PRM bits G1-G6,SE,
or SL=1, or RAI
CV-P Code Violation Count FE count CRC error count
NOTE: Under a UAS-P condition, ES-P and SES-P counts are inhibited.
Under a SES-L or SES-P condition, the respective CV-L or CV-P count is
inhibited.
P. Previous Selection:

1561222003L1-5, Issue 161222003L1-5A
Figure 17 illustrates the Circuit ID, Time/Date
Screen. The circuit ID can be any alphanumeric string
up to 25 characters in length.
The date should be entered as MMDDYY (for
example, enter January 02, 2000, as “010200”). The
time should be entered using military time (for
example, enter 3:15 p.m. as “151500”).
CIRCUIT ID: 01/01/00 00:09:03
Press ESC to return to precious menu
New Circuit ID =
New Date = / / (MM/DD/YY)
New Time = : : (HH:MM:SS)
Press TAB to skip to next entry field.
Figure 17. Circuit ID, Time/Date Screen

16 61222003L1-5, Issue 1 61222003L1-5A
This unit includes t o terminal emulation modes. The
desired terminal mode can be selected from the
Terminal Modes Screen, illustrated in Figure 18.
Additionally, pressing “CTRL” and “T” hile on any
screen can toggle the t o terminal modes.
The Manual Update Mode allo s the user to manually
update the provisioning option screens. This mode
supports efficient print screen and log file utilities for
storage of key provisioning parameters, alarm or
performance history and current system status. “3
SPACES TO UPDATE” appears at the top of each
screen.
By pressing the space bar 3 times the screen ill be
refreshed and ill reflect the most current circuit
conditions and provisioning options.
The second terminal emulation mode is the Real Time
Update Mode (VT100). This mode provides real time
updating of HDSL2 circuit conditions and
provisioning options as changes occur. The Real
Time Update Mode is the default mode.
CIRCUIT ID: 01/01/00 00:09:21
Press ESC to return to precious menu
TERMINAL MODES MENU
MANUAL UPDATE MODE:
* You can print or log screens
* No text is highlighted
* “3 SPACES TO UPDATE” appears at the top of each screen,
reminding you to press the spacebar 3 times to update the screen
* There is a delay between screen changes & updates
* After 30 min. of no interaction, a new baud rate search is begun
* Ignores input until screen is finished printing.
REAL-TIME UPDATE MODE:
* Faster of the two modes
* You cannot print screens to a log file
* Highlighting is enabled
* Recommended for daily operation
Press CTRL+T to toggle update modes on any screen.
Figure 18. Terminal Modes Screen

1761222003L1-5, Issue 161222003L1-5A
The Alarm History Screen, illustrated in Figure 19,
provides the user ith a detailed alarm history and
events log for the HDSL2, T1 spans and the system
alarm history. These screens include a time, date,
first/last occurrence and count for each type of
HDSL2, T1 alarm and system alarm history.
The Event History Screen, illustrated in Figure 20,
provides a log history of HDSL2 circuit events.
CIRCUIT ID: 01/01/00 00:09:39
Press ESC to return to precious menu
T1 Alarm History
LOCATION ALARM FIRST LAST CURRENT COUNT
--------------------------------------------------------------------------------
H2TU-C RED(LOS/LOF) 10/12/00 17:00:22 10/12/00 17:00:22 OK 001
(DSX-1) YELLOW(RAI) OK 000
BLUE(AIS) OK 000
H2TU-R RED(LOS/LOF) OK 000
(DS1) YELLOW(RAI) OK 000
BLUE(AIS) 01/01/00 00:00:04 10/12/00 18:15:03 OK 026
--------------------------------------------------------------------------------
1. T1 Alarm 2. HDSL2 Span 3. System Alarm C. Clear T1 Alarm
Selection:
Figure 19. Alarm History Screen
CIRCUIT ID: 01/01/00 00:10:24
Press ESC to return to precious menu
Num Description of Event Date Time Source
--------------------------------------------------------------------------
1. H2TU-R Powered Up 01/01/00 00:00:01 H2TU-R
2. H2TU-C Powered Up 10/12/00 17:00:22 H2TU-C
3. H2TU-R Powered Up 10/12/00 18:15:01 H2TU-R
4. H2TU-C Powered Up 01/01/00 00:00:43 H2TU-C
Page Number: 1/ 1 Number of Events: 4
--------------------------------------------------------------------------
‘P’ - Previous Page ‘H’ - Home ‘R’ - Reset Events
‘N’ - Next Page ‘E’ - End
Selection:
Figure 20. Event History Screen

18 61222003L1-5, Issue 1 61222003L1-5A
Figure 21. 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 CABLE LENGTHS
1.5
1.0
0.5
TOTAL
BRIDGED
TAP
LENGTH
(KFT)
VALID CABLE LENGTHS
2.0
0.0
7. HDSL2 DEPLOYMENT GUIDELINES
The ADTRAN HDSL2 system provides DS1-based
services over loops designed to comply ith the
Carrier Service Area (CSA) guidelines given belo .
1. All loops are non-loaded only.
2. For loops ith 26-AWG cable, the maximum
loop length including bridged tap lengths is 9 kft.
3. For loops ith 24-AWG cable, the maximum
loop length including bridged tap lengths is
12 kft.
4. Any single bridged tap is limited to 2 kft.
5. Total bridged tap length is limited to 2.5 kft.
6. The total length of multi-gauge cable containing
26-AWG cable must not exceed the follo ing:
12 - {(3*L26)/(9-LBTAP)} (in kft)
L26 = Total length of 26-AWG cable
excluding bridged taps (in kft)
LBTAP = Total length of all bridged taps (in kft)
This deployment criteria is summarized in Figure 21.
Loop loss per kft for other ire is summarized in
Table 7.
Recommended maximum local loop loss information
for PIC cable at 70° F, 135 Ω, resistive termination is
provided in Table 8.
An approximation for the maximum amount of
ideband noise on an HDSL2 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 HDSL2
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 8. Loop Insertion Loss Data
3,000 .............................................. 12.00
10,000 .............................................. 15.00
50,000 .............................................. 25.50
100,000 .............................................. 30.00
150,000 .............................................. 32.75
196,000 .............................................. 35.00
200,000 .............................................. 35.25
250,000 .............................................. 37.50
325,000 .............................................. 42.00
Frequency (Hz) Maximum Loss (dB)
Table 7. HDSL2 Loss Values
(200 kHz cable loss in dB/kft at 135 Ω)
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
Cable Cable Temperature
Gauge Type 68°90°120°
For more information regarding deployment
guidelines and applications, reference ADTRAN’s
Supplement Deployment Information for HDSL/
HDSL2 document, P/N 61221HDSLL1-10.

1961222003L1-5, Issue 161222003L1-5A
8. TROUBLESHOOTING PROCEDURES
Table 9 is a troubleshooting guide for the DDM+
H2TU-C.
9. MAINTENANCE
The ADTRAN DDM+ H2TU-C requires no routine
maintenance.
ADTRAN does not recommend that repairs be
performed in the field. Repair services may be
obtained by returning the defective unit to ADTRAN.
Refer to Warranty and Customer Service section of
this practice.
10. PRODUCT SPECIFICATIONS
Product specifications are detailed in Table 10.
11. WARRANTY AND CUSTOMER SERVICE
ADTRAN ill replace or repair this product ithin
ten (10) years from the date of shipment if it does not
meet its published specifications or fails hile in
service. Refer to ADTRAN U.S. and Canada Carrier
Net orks Equipment Warranty, document
60000087-10.
Contact Customer and Product Service (CAPS) prior
to returning equipment to ADTRAN.
For service, CAPS requests, or further information,
contact one of the follo ing numbers:
ADTRAN Sales
Pricing and Availability
[phone]
ADTRAN Technical Support
Pre-sales Applications/Post-sales Technical Assistance
[phone]
Standard hours: Monday-Friday, 7 a.m. - 7 p.m. CST
Emergency hours: 7 days/week, 24 hours/day
ADTRAN Repair/CAPS
Return for repair/upgrade
[phone]
Repair and Return Address
ADTRAN, Inc.
CAPS
901 Explorer Boulevard
Huntsville, Alabama 35806-2807
Condition Solution
All Faceplate indicators are Off. 1. Verify that -48 VDC power is properly connected to the shelf.
2. Inspect the fuse and verify that it is not blown.
3. Insert the H2TU-C into a slot known to be in good working condition, and check the
STATUS indicator.
4. If Steps 1 and 2 pass, but Step 3 fails, replace the H2TU-C.
Status LED is Blinking Red. Loop has poor signal quality or loss of sync. Basic troubleshooting procedures should
identify a problem with the cable pair.
Status LED is Solid Red. If customer equipment is not installed, initiate an H2TU-R to Network Loopback and
perform BERT test. If this test fails, or the craft interface indicates a loss of sync, then there
is a potential problem with the cable pair that should be identified through basic
troubleshooting procedures.
Status LED is Blinking Green. Errors are being taken on the DSX, DS1 or HDSL2 loop. The craft interface will identify
the source. BERT tests to the appropriate loopbacks should also reveal the source of the
problem.
Table 9. Troubleshooting Guide

20 61222003L1-5, Issue 1 61222003L1-5A
Table 10. DDM+ H2TU-C Specifications
oop Interface
Modulation Type ...................................................... 16-TC PAM
Mode ......................................................................... Full Duplex, Partially Overlapped, Echo Cancelling
Number of Pairs ........................................................ One
Line Rate................................................................... 1.552 mbps
Baud Rate ................................................................. 517.333 K baud
Service Range ........................................................... Defined by Carrier Service Area Guidelines
Loop Loss ................................................................. 35 dB maximum @ 196 kHz
Bridged Taps ............................................................ Single Taps < 2000 feet, Total Taps < 2500 feet
Performance .............................................................. Compliant ith ANSI T1.418-2000 (HDSL2 Standard)
H2TU-C Transmit Po er (Data) Level ................... 16.6 ±0.5 dBm (0 to 450 kHz)
H2TU-C Transmit Po er (Activation) Level .......... 16.3 ±0.5 dBm (0 to 350 kHz)
Input Impedance ....................................................... 135 Ω
Maximum Loop Resistance ...................................... 900 Ω per span
Return Loss ............................................................... 12 dB (50 kHz to 200 kHz)
Network Interface
DSX-1 Output Level ................................................ 0 dB
DSX-1 Line Build Out ............................................. 0-133 feet ABAM
134-266 feet ABAM
267-399 feet ABAM
400-533 feet ABAM
534-655 feet ABAM
DSX-1 Line Code ..................................................... AMI, B8ZS
DSX-1 Format .......................................................... Auto, SF, ESF, Unframed, FFFC (see footnote 1 on page 6)
Power
Tested ith the ADTRAN H2R (P/N 1222045L1) and the ADTRAN H2TU-R (1222026L1).
Total Po er .............................................................. -48 VDC @ 160 mA ith H2TU-R
HTU-C Po er Dissipation ....................................... 4.0 atts ith H2TU-R
Span Po er ............................................................... -190 VDC (Internally Generated) current limited at 150 mA
Fusing ....................................................................... 1.00 A (not field replaceable)
Clock
Clock Sources ........................................................... Internal, DSX-1 Derived ( ith HDSL2 frame bit stuffing)
Internal Clock Accuracy .......................................... ± 25 ppm (exceeds Stratum 4). Meets T1.101 timing requirements.
Tests
Diagnostics ............................................................... Self-Test, Local Loopback (H2TU-C), Remote Loopback (H2TU-R)
Physical
23 in. DDM+ Extension Shelf-Mounted
Dimensions ............................................................... 3.5 in. High x 5/8 in. Wide x 10.25 in. Deep
Weight....................................................................... Approximately 5oz.
Environment
Temperature .............................................................. Operating (Standard) ...... -40° C to +70° C
Storage ............................ -40° C to +85° C
Compliance
UL Listed
Bellcore NEBS Level 3 (SR-3580)
FCC 47CFR Part 15, Class A
Part Number
DDM Plus H2TU-C .................................................. 1222003L1