total access 2 wire 4 wire shdsl ltu installation and maintenance practice
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Section 61182118L1-5BIssue 2, July 2004
61182118L1-5B 1Trademarks: Any brand names and product names included in this document aretrademarks, registered trademarks, or trade names of their respective holders.
CONTENTS
1. General .................................................................... 12. Description .............................................................. 1
3. Installation............................................................... 2
4. Provisioning ............................................................ 3
5. Testing................................................................... 10
6. Maintenance .......................................................... 13
7. Specifications ........................................................ 13
8. Warranty and Customer Service ........................... 14
FIGURES
Figure 1. Total Access 2W/4W SHDSL LTU............. 1
Figure 2. RS-232 (DB-9) Pin Assignments................. 3
Figure 3. 2W/4W SHDSL LTU Main Menu............... 4
Figure 4. 2W/4W SHDSL LTU Menu Tree................ 5
TABLES
Table 1. Compliance Codes ........................................ 2
Table 2. Front Panel LEDs.......................................... 3
Table 3. Default Provisioning Values ......................... 7
Table 4. Cross-Connect Map Timeslot Assignments.. 9
Table 5. Cross-Connect Map Commands ................... 9
Table 6. BERT Test Messages .................................. 10
Table 7. Loopback Types.......................................... 11
Table 8. 2W/4W SHDSL LTU Specifications.......... 13
1. GENERALThis practice is an installation and maintenance guide
for the ADTRANTotal Access2-Wire/4-Wire
SHDSL Line Termination Unit (LTU) (P/N
1182118L1). Figure 1 illustrates the 2W/4W SHDSL
LTU front panel.
Revision HistoryThis is the second issue of this practice. Revisions to
firmware are represented on the menu tree.
2. DESCRIPTIONThe SHDSL LTU receives a G.703 signal from the
network and transmits an SHDSL signal to the
customer. The G.703 and SHDSL signals are trans-
mitted/received via the chassis backplane connectors.
The SHDSL LTU supports loop rates from 192 kbps to
Figure 1. Total Access 2W/4W SHDSL LTU
2.048 Mbps. The unit is 100 percent compliant with the
ITU recommendation (G.991.2) for SHDSL trans-
mission, ensuring spectral compatibility and interopera-
bility.
The Total Access 3000/3010 shelf must contain the
Enhanced System Controller Unit (SCU), in order to
access the SHDSL LTU menus. For more information
regarding the SCU (P/N 1181018L1), refer to the Instal-
lation and Maintenance Practice (P/N 61181018L1-5).
PWR
TEST
SHDSL
ALM
SHDSL1182118L1
G.703
Total Access 2-Wire/4-Wire SHDSL LTU
Installation and Maintenance Practice
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FeaturesThe basic features of the Total Access 2W/4W SHDSL
LTU (P/N 1182118L1) include the following:
BAU interface with 4-wire SHDSL operation
Basic loopback test on a SHDSL loop basis
Full management support of the ADTRAN SHDSL
4-wire NTU Management under SNMP via SCU module
Flash programmable
Supports remote NTU software downloads
Data throughput is adjustable from 192 kbps to
2048 kbps in 64 k increments
SHDSL loop performance monitoring
SHDSL loop attenuation and signal-to-noise ratio
records
Compliance
Table 1 shows the compliance codes for the 2W/4WSHDSL LTU. The 2W/4W SHDSL LTU is NRTL
listed to the applicable UL standards. The 2W/4W
SHDSL LTU is to be installed in a restricted access
location and in a Type B or E enclosure only.
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 users authority to operate this
equipment.
ConnectionsThe SHDSL LTU module fits any one of the 1-28 slots
in the Total Access 3000 chassis or any one of the 1-22
slots in the Total Access 3010 chassis. Power and alarm
signals are provided to the card through the backplane
of the shelf.
The G.703 and SHDSL signals are transmitted/received
via the 64-pin backplane amphenol connectors. The
G.703 signal is transmitted to the network side via Pair
8, and the G.703 signal is received from the network
side via connector Pair 7. The SHDSL signal is trans-
mitted to and from the customer-side NTU via
connector Pair 2 for 2-wire mode and Pair 2 plus
Pair 1 for the 4-wire mode.
3. INSTALLATION
After unpacking the Total Access 2W/4W SHDSL
LTU, inspect it for damage. If damage has occurred, file
a claim with the carrier, then contact ADTRANCustomer Service. Refer to the Warranty and Customer
Service section for further information. If possible, keep
the original shipping container for returning the 2W/4W
SHDSL LTU for repair or for verification of shipping
damage.
Shipping ContentsThe contents include the following items:
2W/4W SHDSL LTU
2W/4W SHDSL LTU Job Aid
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.
Instructions for Installing the ModuleTo install the 2W/4W SHDSL LTU, perform the
following steps:
1. If present, remove the Access Module Blank (P/N
1181953L1) from the appropriate access module
slot of the Total Access 3000/3010 chassis.
Table 1. Compliance Codes
Code Input Output
Power Code (PC) F C
Telecommunication Code (TC) X
Installation Code (IC) A
C A U T I O N !SUBJECT TO ELECTROSTATIC DAMAGE
OR DECREASE IN RELIABILITY.
HANDLING PRECAUTIONS REQUIRED.
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2. Pull the ejector latch, located on the lower left-
hand side of the 2W/4W SHDSL LTU front panel,
from its closed position.
3. Hold the 2W/4W SHDSL LTU by the front panel
while supporting the bottom edge of the module
with the ejector latch opened to engage the chassis
edge.
4. Align the module edges to fit in the lower and
upper guide grooves for the access module slot.
5. Slide the module into the access module slot.
Simultaneous thumb pressure at the top (above the
PWR LED) and at the bottom (below the
electrostatic caution symbol) of the module will
ensure that the module is firmly seated against the
backplane of the chassis.
6. Secure the 2W/4W SHDSL LTU in place by
pushing in on the ejector latch.
When the 2W/4W SHDSL LTU first powers up it runsthe power up self-tests. Once the power up self-test is
complete, the status LEDs will reflect the true state of
the hardware.
Front Panel LEDsThe 2W/4W SHDSL LTU Access Module provides
front panel LEDs to display status information. See
Table 2 for a listing of the front panel LEDs and their
indications.
4. PROVISIONINGAll SHDSL LTU menus are accessed via the SCU. The
Total Access 3000 SCU provides a front panel 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 2.
Figure 2. RS-232 (DB-9) Pin Assignments
The terminal interface can operate at data rates of 9.6,
19.2, 38.4, 57.6, and 115.2 kbps. The asynchronous data
format is fixed at 8 data bits, no parity, and 1 stop bit.
The supported terminal type is VT100 or compatible.
6
7
8
9
1
2
3
4
5
TXD (Transmit Data)
RXD (Receive Data)
SGN (Signal Ground)
Table 2. Front Panel LEDs
Front Panel LED Indication Description
PWR OffGreen
Yellow
Flashing (any color)
No power, or fuse failure
Self-test passed and the module is In-Service
Self-test passed and the module is Out-of-Service
VT100 menu session in progress
SHDSL OffGreen
Red
Module is Out-of-Service, Unassigned
Module has achieved synchronization with the NTU
Module has not achieved synchronization with NTU
G.703 Off
Green
G.703 port not configured (Out-of-Service, Unassigned),
or an alarm condition exists
G.703 port configured and no alarms exist
TST Off
Green
Blinking Green
Red
Module is not in loopback or BERT
Local loopback is active, or BERT running with no errors
Module is running a BERT with bit errors
Module is running a BERT with no pattern sync
ALM OffYellow
Red
No alarm condition detected
Remote alarm condition detected
Alarm condition detected locally
PWR
TEST
SHDSL
ALM
SHDSL1182118L1
G.703
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Menuing SystemThe ADTRAN Total Access SCU provides a menuing
system for the Total Access shelf. All system-related
menus are controlled by the SCU. Each access module
has its own menu structure.
Menu Structure
The menu structure is a layered menu tree. Each menulevel consists of submenus and menu items. Some menu
items are restricted to certain user accounts. The
ADMIN account allows the user to change all provi-
sionable settings as well as network configuration
settings that are not accessible to READWRITE and
READONLY accounts. Examples include SNMP
provisioning, TL1 provisioning, Date/Time settings,
password administration, and software downloads. The
READWRITE account allows changes to standard
provisioning settings and the running of tests. The
READONLY account allows all provisioning settings,
alarms, and statistics to be viewed.
Main Menu
After a successful login, access the Total Access Main
Menu and select option 4, Access Modules. Then
choose the slot number of the desired 2W/4W SHDSL
LTU module. The 2W/4W SHDSL LTU Main Menu is
shown in Figure 3.
SubmenusSubmenus are elements that move the user down to the
next menu level. Menu items are elements which allow
the user to make changes to the current settings. There
are two different types of menu items: read-only and
read-write.
A read-only menu item displays information that
cannot be changed, such as status information.
A read-write menu item is displayed information
that when selected has options that can be changed,
such as the baud rate of the admin port.
Menu Tree
The menu tree in Figure 4 illustrates the path to every
provisioning, performance, and test access point in the
SHDSL menu system.
Figure 3. 2W/4W SHDSL LTU Main Menu
Shelf: 1 Slot: 1 Total Access System 10/21/03 16:29
Unacknowledged Alarms:
Circuit ID: ORIGINAL SLOT 1 CARD Terminal Mode: Local
Main Menu
1. Unit Information
2. Provisioning
3. Status
4. Test
5. Performance History
6. Terminal Mode
Selection:
?. System Help
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Figure 4. 2W/4W SHDSL LTU Menu Tree
1. Unit Information
SHDSL VersionVendor List NumberVendor Issue NumberVendor Software VersionUnit Identification Code (CLEI)Vendor IDVendor Model NumberVendor Serial NumberManufacture DatePROM Check Sum
2. Provisioning
1. Line Card Service State
2. Cross-Connect Map
3. LT Mode Clock Source
4. External Port Alarms
5. NTU Auto-Provisioning
6. Circuit ID7. Restore Factory Defaults
9. Local Management
10. Change Password
8. Upgrade Firmware
1. LTU
2. NTU
1. Interface Mode
2. Payload Rate (Kbps)
3. SNR Margin Alarm Threshold (dB)
1. Unit Options
2. SHDSL Options
1. In Service
2. Out of Service - Unassigned
3. Out of Service - Maintenance
1. Internal Clock
2. G.703 RX Clock
1. Disabled
2. Enabled
1. Disabled
2. Enabled
4. Loop Attenuation Alarm Threshold (dB)
5. Outage Auto-Retrain
6. PM Thresholds
1. 2-wire
2. 4-wire
0. Disabled
1 - 15. Threshold in dB
0. Disabled
1 - 127. Threshold in dB
1. Disabled
2. Enabled
2. SES 15 Minute Alarm Threshold
3. UAS 15 Minute Alarm Threshold
4. CVC 15 Minute Alarm Threshold
5. LOSWS 15 Minute Alarm Threshold
6. OS 15 Minute Alarm Threshold
7. ES 15 Minute Alarm Threshold
8. SES 15 Minute Alarm Threshold
1. ES 15 Minute Alarm Threshold
9. UAS 15 Minute Alarm Threshold
10. CVC 15 Minute Alarm Threshold
11. LOSWS 15 Minute Alarm Threshold
12. OS 15 Minute Alarm Threshold
Loop 2 PM Thresholds
Loop 1 PM Thresholds
A
B
C
3. SHDSL RX Clock
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Figure 4. 2W/4W SHDSL LTU Menu Tree (continued)
3. Status
4. Test
1. ISDN-PRA V3
2. G.704 CRC-4 Multiframing
3. Timeslot Idle Pattern
4. Spare Bits Insertion to Span
5. Spare Bits Pattern to Span
6. Spare Bits Insertion
7. Spare Bits Pattern
9. E-bit Generation
8. RAI Generation
RAM/ROM Power-on Self Test
1. SHDSL Local Loopback
2. SHDSL Remote Loopback
3. SHDSL BERT
4. G.703 Local Loopback
5. G.703 BERT
1. SHDSL Port
2. G.703 Port
3. Reset All Status
1. SHDSL
2. G.703
3. Reset All
5. Performance History
3. G.703 Options
4. Test Options
5. Terminal Mode
1. Disabled
2. Enabled
1. Disabled
2. Enabled
Enter Value
1. Disabled2. Enabled
Enter Value
1. Disabled
2. Enabled
Enter Value
1. Disabled
2. Enabled
1. Disabled
2. Enabled
10. PM Thresholds2. SES 15 Minute Alarm Threshold
3. UAS 15 Minute Alarm Threshold
4. CVC 15 Minute Alarm Threshold
1. ES 15 Minute Alarm Threshold
2. Loopback Timeout (Min)
3. BERT Tx Pattern
4. BERT Tx Pattern Polarity
1. Loopback Types1. SHSDL Loopback Type = Dual Sided
2. G.703 Loopback Type = Dual Sided
0. Disabled
1 - 999. Timeout in Minutes
2. 2047
3. 2e15-1
4. QRSS
1. ALT
1. Normal
2. Inverted
1. Reset Statistics
2. View Alarms
1. Reset Statistics
2. View Alarms
B
A
Shelf: 1 Slot: 17 Total Access System 01/19/04 21:11Unacknowledged Alarms: MAJOR INFOCircuit ID: Terminal Mode: Local
Cross-Connect MapSHDSL Timeslots G.703 Timeslots
TS0 = 0 TS12 = 0 TS24 = 0 TS0 = 0 TS12 = 0 TS24 = 0TS1 = 0 TS13 = 0 TS25 = 0 TS1 = 0 TS13 = 0 TS25 = 0TS2 = 0 TS14 = 0 TS26 = 0 TS2 = 0 TS14 = 0 TS26 = 0TS3 = 0 TS15 = 0 TS27 = 0 TS3 = 0 TS15 = 0 TS27 = 0TS4 = 0 TS16 = 0 TS28 = 0 TS4 = 0 TS16 = 0 TS28 = 0TS5 = 0 TS17 = 0 TS29 = 0 TS5 = 0 TS17 = 0 TS29 = 0
TS6 = 0 TS18 = 0 TS30 = 0 TS6 = 0 TS18 = 0 TS30 = 0TS7 = 0 TS19 = 0 TS31 = 0 TS7 = 0 TS19 = 0 TS31 = 0TS8 = 0 TS20 = 0 TS8 = 0 TS20 = 0TS9 = 0 TS21 = 0 TS9 = 0 TS21 = 0TS10 = 0 TS22 = 0 TS10 = 0 TS22 = 0TS11 = 0 TS23 = 0 TS11 = 0 TS23 = 0
Timeslot Assignments Commands0. Idle A. Apply New Map G. Full G.703 Service1. G.703 C. Cancel Changes32. G.704 Frame Z. Zero New Map Tab. SHDSL or G.703 Timeslots
Movement Keys: U. Up D. Down L. Left R. RightG.704 Framing = NA
C
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Table 3 lists the factory default values for each of the
2W/4W SHDSL LTU provisioning options.
Table 3. Default Provisioning Values
Provisioning Options Values Default
Unit Options
Line Card Service State In ServiceOut of Service - Unassigned
Out of Service - Maintenance
Out of Service - Maintenance
Cross-Connect Map For each timeslot assignment:
0 = unassigned, idle pattern transmitted
out of associated port
1 = G.703
32 = G.704 CCS Framing timeslot
Full G.703 Service with
G.704 Framing = NT Delivered
LT Mode Clk Source Internal Clock
G.703 RX Clock
SHDSL RX Clock
Internal Clock
External Port Alarms DisabledEnabled
Disabled
NTU Auto Provisioning Disabled
Enabled
Disabled
SHDSL Options
Interface Mode 2-wire
4-wire
2-wire
Payload Rate (kbps) Enter a new value for N from 3 to 32,
where Payload Rate (kbps) = N x 64
2048 (N=32)
SNR Margin Alarm Threshold (dB) Disabled
1-15 Threshold in dB
Disabled
Loop Attenuation Alarm Threshold (dB) Disabled
1-127 Threshold in dB
Disabled
Outage Auto-Retrain Disabled
Enabled
Disabled
PM Thresholds See below for Loop 1 and Loop 2
ES 15 Minute Alarm Threshold Disabled
1 to 900 = Alarm Threshold
Disabled
SES 15 Minute Alarm Threshold Disabled
1 to 900 = Alarm Threshold
Disabled
UAS 15 Minute Alarm Threshold Disabled
1 to 900 = Alarm Threshold
Disabled
CVC 15 Minute Alarm Threshold Disabled
1 to 65535 = Errors
Disabled
LOSWS 15 Minute Alarm Threshold Disabled
1 to 900 = Alarm Threshold
Disabled
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OS 15 Minute Alarm Threshold Disabled
1 to 900 = Alarm Threshold
Disabled
G.703 Options
ISDN-PRA V3 DisabledEnabled Disabled
G.704 CRC-4 Multiframing Disabled
Enabled
Disabled
Timeslot Idle Pattern 00h to FFh FFh
Spare Bits Insertion to Span Disabled
Enabled
Disabled
Spare Bits Pattern to Span 00h to 1Fh
(0, 0, 0, Sa4, Sa5, Sa6, Sa7, Sa8)
1Fh
Spare Bits Insertion Disabled
Enabled
Disabled
Spare Bits Pattern 00h to 1Fh
(0, 0, 0, Sa4, Sa5, Sa6, Sa7, Sa8)
1Fh
RAI Generation Disabled
Enabled
Enabled
E-bit Generation Disabled
Enabled
Disabled
PM Thresholds See below
ES 15 Minute Alarm Threshold Disabled
1 to 900 = Alarm Threshold
Disabled
SES 15 Minute Alarm Threshold Disabled
1 to 900 = Alarm Threshold
Disabled
UAS 15 Minute Alarm Threshold Disabled
1 to 900 = Alarm Threshold
Disabled
CVC 15 Minute Alarm Threshold Disabled
1 to 65535 = Errors
Disabled
Test Options
Loopback Types (for SHDSL and G.703) Dual Sided
Transparent
Non-Transparent
Dual Sided
Loopback Time Out Disabled
1-999 Time Out (Min)
Disabled
BERT Tx Pattern ALT
2047
2e15-1
QRSS
2e15-1
BERT Test Pattern Polarity Normal
Inverted
Normal
Table 3. Default Provisioning Values (Continued)
Provisioning Options Values Default
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Cross-Connect Map
The purpose of the cross-connect map (Table 4 on
page 5) is to allocate the time slots (TS0s) from the
SHDSL loop to user ports (E1) and configure framing.
The cross-connect maps can be accessed via the VT100
terminal screens.
1. select 2, Provisioning, from the Main Menu
2. select 1, Unit Options,
3. select 2, Cross Connect Map.
The cross-connect map is split down the middle in two
sections. The left section of the map lists the SHDSL
time slots and right section of the map lists the G.703
time slots. The user builds a new pending map before
making it active with the apply key. The options listed
at the bottom of the screen allow the user to setup and
manipulate the time slots. The statement at the bottom
of the screen indicates the framing status. Time slot
configuration options are described in Table 4.
Cross-connect commands are described in Table 5.
Typical Applications
Framed Full E1 Service is set up using the quick keyG, and then selecting A to save the changes.
Unframed Full E1 Service is set up using the quick key
G, entering 1 in both the SHDSL TS0 slot and the
G.703 TS0 slot, and then selecting A to save the
changes.
Table 4. Cross-Connect Map Timeslot Assignments
Option Description
0. Idle If a time slot is set for idle, an idle code is inserted. The pattern will always be FF hex (all
1s) toward the SHDSL network. The idle pattern out the G.703 interface is programmable
under the G.703 option. The default is FF hex (all 1s).
1. G.703 Service The selected time slot will carry G.703 service (Refer to the Full G.703 Services
subsection for more information).
32. G.704 Framing This option enables three different framing configurations. Framing is always set in the
first time slot (TS0). The framing will be locally generated if 32 is entered in the G.703
TS0 slot only. If 32 is entered in the G.703 TS0 and the SHDSL TS0, then the framing
will be passed transparently between the G.703 and SHDSL ports. If values other than 32
are assigned to both the SHDSL TS0 slot and G.703 TS0 slot then the operation is G.703unframed (if other G.703 service values are assigned to the G.703 time slots).
Table 5. Cross-Connect Map Commands
Command Description
A. Apply New Map This command saves and activates any changes made by the user.
C. Cancel Changes This command will undo any changes made by the user since the last saved
configuration. The new pending map will revert to the currently active time slot
assignments.
G. Full G.703Service
If this quick key command is selected, the cross-connect map will automatically
configure the time slots for Full G.703 service, and the framing will be set for
transparent. Refer to the Typical Applications subsection for more information.
Tab. Select SHDSL
or G.703 Time SlotsThe tab key moves the cursor between the SHDSL and G.703 sections of the cross-
connect map.
Arrow Keys Move
Cursor
The arrow keys allow movement between the individual time slots.
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5. TESTINGTesting of the SHDSL circuit from the LTU includes
the following capabilities:
Self Diagnostics
Loopbacks
Bit Error Rate Testing (BERT)
BERTThe 2W/4W SHDSL LTU contains a built-in Bit Error
Rate Test (BERT). The BERT involves injecting and
detecting a Pseudorandom Binary Sequence (PRBS)
toward the network on the selected payload (that is,
G.703 or entire SHDSL payload). The PRBS used in the
SHDSL NTU is PRS15 as defined in ITU-T 0.150 and
0.151. It is also known as a 2e-15 pattern.
The BERT is only accessible via the VT100 terminal
screens. Select 4. Test from the Main Menu Screen.
From the Test Screen, the SHDSL BERT, G.703 BERT,and options will appear, as described in Table 6.
Table 6. BERT Test Messages
Message Description
BERT Status:
N/A This BERT is currently unavailable. Only one BERT can be active at a time. For
example, if SHDSL BERT is active, all others will be N/A.
ACTIVE This BERT is currently in progress. The source column identifies the originator of theBERT in progress.
INACTIVE This BERT is not currently in progress. After selecting a BERT type from the Test
Screen, the BERT Screen will appear, illustrating both BERT statistics and commands.
BERT Commands (with inactive BERT):
Start Starts the BERT on the selected port/service.
Stop Stops the BERT in progress.
BERT Commands (with active BERT):
Inject a Single BitError
Injects one bit error into the pattern.
Restart Clears out all statistics and restarts the BERT.
Statistical Messages:
Bit Error Rate Total number of bit errors divided by the total number of bits in the current test interval.
Bit Error Count Total number of bit errors in the current test interval.
Pattern Sync Loss
CountTotal number of times that the BERT has lost pattern sync.
Errored Seconds Total number of seconds in which at least one bit error has occurred.
Total Elapsed Time Total time that has elapsed since the test began (Days: Hours: Minutes: Seconds).
BERT status field information:
On The BERT has started and has pattern sync.
Searching for pattern The BERT has lost pattern sync.
Off This BERT is currently off.
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LoopbacksThere are five types of local loopbacks and five types of
remote loopbacks available for each of the two line
interfaces (G.703, and SHDSL). When initiating a
loopback, the first step is choosing a line interface.
When G.703 is chosen, the loopback will occur at the
G.703 drivers and receivers. When SHDSL is chosen,
the loopback will occur at the SHDSL drivers andreceivers. The loopback descriptions and illustrations
are shown in Table 7.
NOTE
All remote loopbacks are initiated at the local
2W/4W SHDSL LTU unit.
Table 7. Loopback Types
Loopback Type Description Illustration
Local Dual Sided
Loopback
Provides a bidirectional loopback at the LTU.
Remote Dual SidedLoopback
Initiated at the LTU and provides bidirectionalloopback at the NTU.
Local Network
Transparent
Loopback
Provides a loopback at the LTU in the network
direction. Data is passed transparently to the
customer side.
Remote Network
Transparent
Loopback
Initiated at the LTU and provides a loopback at
the NTU in the network direction. Data is
passed transparently to the customer side.
Local Network
Nontransparent
Loopback
Provides a loopback at the LTU in the network
direction. AIS signal is injected into the
customer side.
Remote Network
Nontransparent
Loopback
Initiated at the LTU and provides a loopback at
the NTU in the network direction. AIS signal is
injected into the customer side.
Local CustomerTransparent
Loopback
Provides a loopback at the LTU in thecustomer direction. Data is passed
transparently to the network side.
LTU NTU
LTU NTU
LTUTX Data
NTU
LTU TX DataNTU
LTUTX AIS
NTU
LTU TX AISNTU
LTU
TX Data
NTU
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Remote Customer
Transparent
Loopback
Initiated at the LTU and provides a loopback at
the NTU in the customer direction. Data is
passed transparently to the network side.
Local Customer
Nontransparent
Loopback
Provides a loopback at the LTU in the
customer direction. AIS signal is injected into
the network side.
Remote Customer
Nontransparent
Loopback
Initiated at the LTU and provides a loopback at
the NTU in the customer direction. AIS signal
is injected into the network side.
Table 7. Loopback Types (Continued)
Loopback Type Description Illustration
LTU
TX Data
NTU
LTU
TX AIS
NTU
LTU
TX AIS
NTU
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6. MAINTENANCEThe Total Access 2W/4W SHDSL LTU requires no
routine maintenance for normal operation.
ADTRAN does not recommend that repairs be
attempted in the field. Repair services may be obtained
by returning the defective unit to ADTRAN. Refer to
the Warranty and Customer Service section for further
information.
7. SPECIFICATIONSSpecifications for the Total Access 2W/4W SHDSL
LTU are detailed in Table 8.
Table 8. 2W/4W SHDSL LTU Specifications
Network Interface
SHDSL Line Rate
SHDSL Service Range
G.703 Service Data Rate
Line Code
Timing Source
Impedance
SHDSL per ITU G991.2:
2-wire mode = 192 kbps to 2.048 Mbps
4-wire mode = 400 kbps to 2.064 Mbps
Refer toITU 991.2, Annex B, Performance Requirements
64 kbps to 1.984 Mbps
TC PAM
Internal clock (internal oscillator with >32 ppm tolerance,
OR G.703 RX clock (B.703 port-derived receive clock)120 ohms balanced
Environmental
Operating Temperature
Storage Temperature
Relative Humidity
Maximum Current Draw
Maximum Heat Dissipation
0C to +55C
20C to +65C
95 percent maximum noncondensing
0.025 A maximum
1.21 watts @ 48VDC
Power
Span Power 120 VDC, current limited, not more than 150 mA output
Physical
Dimensions
Weight
152.4 mm H x 15.9 mm W x 254 mm D
< 1 lb.
Compliance
SHDSL
G.703 Ports
Environmental
ITU-T G.991.2
ITU-T G.703
ETS 300 019-2-3
Part Number
Total Access 2W/4W SHDSL LTU Unit 1182118L1
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8. WARRANTY AND CUSTOMER SERVICEADTRAN will replace or repair this product within the
warranty period if it does not meet its published specifi-
cations or fails while in service. Warranty information
can be found at www.adtran.com/warranty.
U.S. and Canada customers can also receive a copy of
the warranty via ADTRANs toll-free faxback server at
877-457-5007.
Request Document 414 for the U.S. and Canada
Carrier Networks Equipment Warranty.
Request Document 901 for the U.S. and Canada
Enterprise Networks Equipment Warranty.
Refer to the following subsections for sales, support,
CAPS requests, or further information.
ADTRAN, Inc.Attention: International Department
901 Explorer Boulevard
Huntsville, Alabama 35806
USA
www.adtran.com
international@adtran.com
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