total access 2 wire 4 wire shdsl ltu installation and maintenance practice

8/3/2019 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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2 Issue 2, July 2004 61182118L1-5B

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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61182118L1-5B Issue 2, July 2004 3

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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4 Issue 2, July 2004 61182118L1-5B

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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61182118L1-5B Issue 2, July 2004 5

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




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




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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61182118L1-5B Issue 2, July 2004 7

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


Disabled

UAS 15 Minute Alarm Threshold Disabled


Disabled

CVC 15 Minute Alarm Threshold Disabled

1 to 65535 = Errors

Disabled

LOSWS 15 Minute Alarm Threshold Disabled


Disabled


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8 Issue 2, July 2004 61182118L1-5B

OS 15 Minute Alarm Threshold Disabled


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


Disabled

SES 15 Minute Alarm Threshold Disabled


Disabled

UAS 15 Minute Alarm Threshold Disabled


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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61182118L1-5B Issue 2, July 2004 9

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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10 Issue 2, July 2004 61182118L1-5B

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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61182118L1-5B Issue 2, July 2004 11

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


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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12 Issue 2, July 2004 61182118L1-5B

Remote Customer

Transparent

Loopback


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


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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61182118L1-5B Issue 2, July 2004 13

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

[email protected]

total access 2 wire 4 wire shdsl ltu installation and maintenance practice

Documents