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239 T1 HDSL4 Repeater (H4R)

Installation and Maintenance Practice

Part Number - 61223445L1-5D

239 H4R

1223445L1

LP1

 

 

NET

LP2

 

LP1

 

 

CUST

LP2

 

LL /RL

(Y)

(G)

CLEI: T1R6U87D_ _

October 2004

239 H4R Installation and Maintenance Practice

Trademarks

Any brand names and product names included in this manual are trademarks, registered trademarks, or trade names of their respective holders.

To the Holder of the Manual

The contents of this publication are current as of the date of publication. ADTRAN reserves the right to change the contents without prior notice.

In no event will ADTRAN be liable for any special, incidental, or consequential damages or for commercial losses even if ADTRAN has been advised thereof as a result of issue of this publication.

®

901 Explorer Boulevard

P.O. Box 140000

Huntsville, AL 35814-4000

(256) 963-8000

©2004 ADTRAN, Inc.

All Rights Reserved.

Printed in U.S.A.

ii

61223445L1-5D

This font

239 H4R Installation and Maintenance Practice

Revision History

Revision

Date

Description of Changes

 

 

 

D

October 2004

Updated to add Bad Splice Detect and Fast Retrain feature

 

 

descriptions

 

 

 

Conventions

The following typographical conventions are used in this document:

This font indicates a cross-reference link. First-time references to tables and figures are shown in this font.

indicates screen menus, fields, and parameters.

THIS FONT indicates keyboard keys (ENTER, ESC, ALT). Keys that are to be pressed simultaneously are shown with a plus sign (ALT+X indicates that the ALT key and X key should be pressed at the same time).

This font indicates references to other documentation and is also used for emphasis. This font indicates on-screen messages and prompts.

This font indicates text to be typed exactly as shown.

This font indicates silkscreen labels or other system label items. This font is used for strong emphasis

NOTE

Notes inform the user of additional but essential information or features.

CAUTION

Cautions inform the user of potential damage, malfunction, or disruption to equipment, software, or environment.

WARNING

Warnings inform the user of potential bodily pain, injury, or death.

61223445L1-5D

iii

239 H4R Installation and Maintenance Practice

Training

ADTRAN offers training courses on our products. These courses include overviews on product features and functions while covering applications of ADTRAN’s product lines. ADTRAN provides a variety of training options, including customized training and course taught at our facilities or at customer sites. For more information about training, please contact us.

Training Phone:

800-615-1176, ext. 7500

Training Fax:

256-963-6700

Training Email:

training@adtran.com

iv

61223445L1-5D

Contents

1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2. Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Bad Splice Detection Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

View Splice Results Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Fast Retrain Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Shipping Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4. Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

5. HDSL4 Deployment Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

6. H4R Capacity Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

7. Front Panel LEDs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

8. Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

9. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Appendix A

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

Warranty and Customer Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

ADTRAN Sales . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

ADTRAN Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

ADTRAN Repair/CAPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

Repair and Return Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

Figures

Figure 1. HDSL4 239 T1 HDSL4 Repeater (H4R) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Figure 2. Splice Results Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Tables

Table 1. ADTRAN Unit Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Table 2. Compliance Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Table 3. H4R Card Edge Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Table 4. 239 H4R Capacity Guidelines for ADTRAN Housings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Table 5. 239 H4R Capacity Guidelines for Other Housings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Table 6. Front Panel LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Table 7. 239 T1 HDSL4 Repeater (H4R) Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

61223445L1-5D

v

Tables

239 H4R Installation and Maintenance Practice

 

 

This page is intentionally blank.

vi

61223445L1-5D

239 T1 HDSL4 Repeater (H4R)

1.GENERAL

This practice is an installation and maintenance guide for the ADTRAN® 239 T1 HDSL4 Repeater (H4R) (239 H4R). Figure 1 illustrates the 239 H4R (P/N 1223445L1) front panel.

239 H4R

1223445L1

LP1

 

 

NET

LP2

 

LP1

 

 

CUST

LP2

 

LL /RL

(Y)

(G)

Figure 1. HDSL4 239 T1 HDSL4 Repeater (H4R)

2.DESCRIPTION

HDSL4 provides extended range T1 (DS1) transport on the telecommunications network. HDSL4 features spectral compatibility with ADSL and other transport technologies.

This 239 H4R performs signal regeneration to extend the range of the HDSL4 circuit.

The H4TU-C (Central Office Transceiver) unit receives DSX-1 input signals from the network through the chassis, transports them across the HDSL4 circuit, and terminates them through an H4TU-R remote unit which provides a traditional DS1 to customer equipment. The H4TU-C provides testing, provisioning, and performance monitoring capabilities that address circuit status.

The H4TU-C works in conjunction with the ADTRAN H4TU-R (Remote) and up to three H4Rs (Repeaters) to provide a DS1 service on the local loop.

61223445L1-5D

1

Description

239 H4R Installation and Maintenance Practice

 

 

Features

The basic features of the HDSL4 239 T1 HDSL4 Repeater (H4R), include the following:

TC PAM line coding

Lightning protection

In-band loopback control

Standard 239 form factor repeater apparatus case design

Remote provisioning and pass-through performance monitoring

Bad Splice Detection

Fast Retrain

Bad Splice Detection Feature

This 239 H4R supports the Runtime TScan 2.0TM bad splice detection feature, an ADTRAN proprietary non-intru- sive algorithm for detection of anomalies (bad splices) in the copper pair.

Data transmission transceivers (especially echo-cancelled technologies) are subject to performance degradations and errors in the presence of bad splices. A splice may be benign for a period of time, allowing a circuit to behave appropriately for portions of the day. However, over time the splice will oxidize and incur small, rapid changes in impedance. This inconsistency in behavior makes the problem difficult to locate. Additionally, an impedance change that is large enough to cause the transceiver trouble may still be small enough to be undetected by test equipment utilized on the copper pairs. Therefore a non-intrusive method of identifying these bad splices has been developed to aid the customer in troubleshooting their distribution plant.

NOTE

The Splice Detection Feature is included with this product as an aid to troubleshooting. Due to inconsistency in environmental conditions and their effect on telecommunications plant, ADTRAN cannot guarantee the accuracy of the measurements. Comparison to existing engineering drawings should provide exact locations of suspect splices indicated by ADTRAN algorithms.

Splices that are varying in impedance will cause the HDSL data pump to see a reduced and/or fluctuating signal quality (margin). The HDSL data pump will attempt to track these changes. When the changes become too severe, errors or loss of synchronization result.

View Splice Results Screen

The Bad Splice Detection feature is accessed from the Troubleshooting screen via the craft access terminal of the H4TU-C or H4TU-R. Selecting the View Splice Results option from the Troubleshooting screen menu displays the screen illustrated in Figure 2. Results will be reported in the Splice Detection Results column for each transceiver:

NTF - Reported if the unit is active and no problems have been detected or the number of anomalies detected have not yet reached the detection count threshold, which facilitates the reporting of the result to this screen. (Eight is the present threshold.)

LOS - Reported if the remote unit has not been detected.

Number - Reported if an anomaly has been detected a number of times that exceeds the detection count threshold of eight. The number shown in this column represents the number of feet from the transceiver (Reference Point)

2

61223445L1-5D

239 H4R Installation and Maintenance Practice

Description

 

 

to that anomaly. This number will also reflect the highest anomaly count seen, as it is possible to have more than one bad splice per circuit. This screen will report the worst (most frequently detected) anomaly.

In this example, a detection has occurred approximately 650 feet from an H4TU-C module on Loop 2 of the HDSL4 circuit.

Circuit ID:HTSVALHDSL4

 

to return to previous menu

06/17/04 07:32:04

 

 

 

Press ESC

 

 

* Note: Chronic Circuit Results

are only valid after all other circuit

*

* qualification tests have been

performed and failed to show a trouble !! *

Splice Detector Version 1 Result Definitions:

 

 

 

---------------------------------------------

 

 

 

NTF

-

No Trouble Found yet.

 

 

 

 

LOS

-

Unit not in sync.

 

 

 

 

 

Number -

Distance from Reference point (in ft.) of suspect splice.

 

Reference

Splice Detection Results

Version

Result Shown

 

Point

 

Loop 1

Loop 2

Number

for date

 

---------

H4TUC

 

----------

----------

-------

MM/DD/YY

 

 

 

NTF

 

650

01

06/17/04--------

 

 

H4TUR

NET

NTF

 

NTF

01

 

 

H4RU1

NTF

 

NTF

01

(B)Back

 

 

H4RU1

CST

NTF

 

NTF

01

 

Figure 2. Splice Results Screen

Fast Retrain Feature

Fast Retrain is an ADTRAN proprietary feature whose intent is to minimize downtime when an intermittent non power-related impairment (bad splice, noise burst, etc.) affects the HDSL loop and cannot be bridged.

HDSL2 and HDSL4 transceivers normally train in approximately 25 to 30 seconds. For an initial circuit turn-up, this is not a big issue. However, once service has been established on the circuit, any large down-time will interrupt communications on the circuit. A loss of synchronization on the HDSL loop can cause excessive down times due not only to the 30-second HDSL retrain time, but also further delays due to the higher level protocols in the network going through re-synchronization. On the older generation HDSL2 and HDSL4 units, a 1-second loss of HDSL frame synchronization would cause the data pumps to retrain. This retrain would take approximately 25 seconds during which AIS would be sent to the terminating equipment. The reception of AIS by the terminating equipment then might trigger higher level protocol re-synchronizations.

In an effort to minimize this down time, the Fast Retrain feature has been implemented. If an impairment (bad splice, for example) causes the HDSL data pump to lose frame synchronization for 500 msec or longer, instead of retraining, a fast retrain will be attempted. This abbreviated train can achieve data mode in 5 to 7 seconds. A successful fast retrain should be evident by watching the Span Status screen and by reduced unavailable seconds (UAS) in the PM data for each LOS alarm recorded.

NOTE

Fast-Retrain capable units must be installed on both ends of the HDSL4 circuit for this feature to function properly. Also, if there is a failure of a fast retrain attempt, for any reason, then the traditional (25-30 second) retrain will be initiated.

61223445L1-5D

3

Description

239 H4R Installation and Maintenance Practice

 

 

Compatibility

The 239 H4R is used in conjunction with any T1.418 compliant span powering H4TU-C and H4TU-R. Compatible ADTRAN HDSL4 transceiver units are listed in Table 1.

Table 1. ADTRAN Unit Compatibility

Part Number

Unit Name

 

 

118141xLy

Total Access 3000 H4TU-C

 

 

122x401Ly

220 H4TU-C

 

 

122x403Ly

DDM+ H4TU-C

 

 

122x404Ly

3192 H4TU-C

 

 

122x407Ly

Soneplex H4TU-C

 

 

122x424Ly

T200 H4TU-R, Local Power

 

 

122x426Ly

T200 H4TU-R, Span Power

 

 

x = any generic number; y = any list number

Due to span power limits, the number of H4Rs permitted in the circuit depends upon the type of H4TU-C utilized. An ADTRAN 239 H4R provides DS1 transport on all revised resistance design (RRD) 26 AWG and/or 24 AWG loops. Three ADTRAN 239 H4R repeaters may be added to extend the range of a loop.

Repeater placement is determined by the following criteria:

On single H4R loops, only on the attenuation properties of the loop segment must be considered.

For a circuit requiring two H4Rs, both segment attenuation as well as segment DC resistance requirements be satisfied.

For a circuit requiring three H4Rs, H4TU-C and H4TU-R hardware requirements, segment attenuation, and segment DC resistance requirements must all be satisfied.

Refer to the “HDSL4 Deployment Guidelines” on page 6 of this practice and the Installation and Maintenance Practice for the deployed H4TU-C.

Compliance

Table 2 shows the compliance codes for the 239 H4R. The 239 H4R is NRTL listed to the applicable UL standards. The 239 H4R is to be installed in a restricted access location and in a Type “B” or “E” enclosure only.

Table 2. Compliance Codes

Code

Input

Output

 

 

 

Power Code (PC)

C

C

 

 

 

Telecommunication Code (TC)

 

X

 

 

 

Installation Code (IC)

A

 

 

 

4

61223445L1-5D

239 H4R Installation and Maintenance Practice

Installation

 

 

This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions:

1.This device may not cause harmful interference.

2.This device must accept any interference received, including interference that may cause undesired operation.

Changes or modifications not expressly approved by ADTRAN could void the user’s authority to operate this equipment.

3.INSTALLATION

C A U T I O N !

SUBJECT TO ELECTROSTATIC DAMAGE

OR DECREASE IN RELIABILITY.

HANDLING PRECAUTIONS REQUIRED.

After unpacking the 239 H4R, inspect it for damage. If damage has occurred, file a claim with the carrier, then contact ADTRAN Customer Service. Refer to “Appendix A, Warranty” for further information. If possible, keep the original shipping container for returning the 239 H4R for repair or for verification of shipping damage.

Shipping Contents

The contents include the following items:

239 T1 HDSL4 Repeater (H4R)

239 T1 HDSL4 Repeater (H4R) 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.

There are no manual option settings for the H4R.

H4R power is derived from an H4TU-C, independent of line impedance or wire gauge. The operating power from the H4TU-C may also be used to span power the H4TU-R.

The 239 H4R is designed for deployment in any environmentally controlled 239-type apparatus case. A retainer latch is available for securing the 239 H4R in the apparatus case.

When installing the ADTRAN 239 H4R refer to the Installation and Maintenance Practice for the housing being used.

61223445L1-5D

5

Connections

239 H4R Installation and Maintenance Practice

 

 

4.CONNECTIONS

All connections are made through card edge connectors.

Table 3 provides the card edge pin assignments.

CAUTION

The H4R dissipates a maximum of 5.4 watts.

NOTE

Ensure that the chassis ground is securely connected to the apparatus case. Ground pin designations are defined in Table 3.

Table 3. H4R Card Edge Pin Assignments

Pin

Designation

Description

 

 

 

1

GND

Ground

 

 

 

2

NC

No Connect

 

 

 

3

T1

Customer Loop 1 Tip

 

 

 

4

R1

Customer Loop 1 Ring

 

 

 

5

T1

Network Loop 1 Tip

 

 

 

6

R1

Network Loop 1 Ring

 

 

 

7

NC

No Connect

 

 

 

8

T

Network Loop 2 Tip

 

 

 

9

R

Network Loop 2 Ring

 

 

 

10

GND

Ground

 

 

 

11

T

Customer Loop 2 Tip

 

 

 

12

R

Customer Loop 2 Ring

 

 

 

5.HDSL4 DEPLOYMENT GUIDELINES

Refer to the H4TU-C Installation and Maintenance Practice, HDSL4 Deployment Guidelines section, for loop parameters including attenuation and loop resistance considerations.

NOTE

The H4TU-C with part numbers 1221401L6, 1221403L6, and 1221404L6 support only one H4R in the HDSL4 circuit.

Refer to the Detailed Status Screen by accessing the menus on the H4TU-C craft terminal interface for current Signal-to-Noise Ratio Margin and Attenuation status indications for the circuit.

6

61223445L1-5D

5D-61223445L1

7

6.H4R CAPACITY GUIDELINES

The ADTRAN 239 H4R is designed for installation in a prewired apparatus case, and the capacity guidelines for deployment are defined in Table 3 and Table 4. These housing capacity numbers are based upon testing results.

Table 4. 239 H4R Capacity Guidelines for ADTRAN Housings

 

 

 

 

 

H4R Capacity

Recommended Slot

 

Part

 

 

 

 

Assignments

 

Description

CLEI Code

Slots

Stub

 

 

Material

 

 

 

 

Number

Above

Below

Above

Below

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ground

Ground

Ground

Ground

 

 

 

 

 

 

 

 

 

 

 

1150027L1

239/439 Housing

DDMOABA1MA

4

Air

4

4

All

All

Stainless/Polymer

 

 

 

 

 

 

 

 

 

 

1150027L2

239/439 Housing

DDMOBBA1MA

4

Gel

4

4

All

All

Stainless/Polymer

 

 

 

 

 

 

 

 

 

 

1150057L1

Universal Housing

DDMODA01RA

4

Air

4

4

All

All

Stainless Steel

 

 

 

 

 

 

 

 

 

 

1150057L1

Universal Housing

DDMODA01RA

4

Gel

4

4

All

All

Stainless Steel

 

 

 

 

 

 

 

 

 

 

1150058L1

Universal Housing

DDMOEE01RA

8

Air

8

8

All

All

Stainless Steel

 

 

 

 

 

 

 

 

 

 

1150058L2

Universal Housing

DDMOFE01RA

8

Gel

8

8

All

All

Stainless Steel

 

 

 

 

 

 

 

 

 

 

Practice Maintenance and Installation (H4R) Repeater HDSL4 T1 239

Guidelines Capacity H4R

8

5D-61223445L1

Table 5. 239 H4R Capacity Guidelines for Other Housings

 

 

Manufacturer’s Part

 

H4R Capacity

Recommended Slot Assignments

 

Manufacturer

Description

Slots

 

 

 

 

Material

 

 

 

 

Number

Above

Below

Above Ground

Below Ground

 

 

 

 

 

 

 

 

Ground

Ground

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ADC

Radiator II

SPX-HRXC-30-AG-016GT

16

16

16

All

All

Stainless Steel

 

 

 

 

 

 

 

 

 

ADC

Radiator

SPX-HRXC-30-B1

8

8

8

All

All

Stainless Steel

 

 

 

 

 

 

 

 

 

Circa Telecom

HDSL-12A

760005

12

12

12

All

All

Stainless Steel

 

 

 

 

 

 

 

 

 

Circa Telecom

HDSL-12B

760006

12

12

12

All

All

Stainless Steel

 

 

 

 

 

 

 

 

 

Arris/Lucent/

Keptel® Inter

RF809A3-XXX or

12

8

N/A

1, 3, 4, 6

N/A

Polymer

AT&T

Link809

RF809B3-XXX

 

 

 

7, 9, 10, 12

 

 

Arris/Lucent/

Keptel® Inter

RF819A1 or RF819A2

25

12

16*

Chamber 1:

Chamber 1:

Polymer

AT&T

Link818/819

RF819B1 or RF819B2

 

 

 

1, 4, 7, 8, 11, 14

1, 3, 5, 7, 8, 10,

 

 

 

 

 

 

 

Chamber 2:

12, 14

 

 

 

 

 

 

 

15, 17, 19, 20, 23,

Chamber 2:

 

 

 

 

 

 

 

25

15, 16, 18, 19, 20,

 

 

 

 

 

 

 

 

22, 24, 25

 

 

 

 

 

 

 

 

 

 

Arris

Keptel Inter

AT819B1U or

12

8

8

2, 3, 5, 6, 8, 9,

2, 3, 5, 6, 8, 9,

Polymer

 

Link 819 Fam-

AT819A1U

 

 

 

11, 12

11, 12

 

 

ily

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Arris/Lucent/

Keptel Inter

RF820AX or

2 to 8

Full

Full

All

All

Polymer

AT&T

Link 820 Fam-

RF820BX

 

 

 

 

 

 

 

ily

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

* For 16 slot use, the ambient air temperature measured 1 foot away and parallel to the housing should not exceed 115°F (46.1°C).

Guidelines Capacity H4R

Practice Maintenance and Installation (H4R) Repeater HDSL4 T1 239

239 H4R Installation and Maintenance Practice

Front Panel LEDs

 

 

7.FRONT PANEL LEDS

The ADTRAN 239 H4R provides front panel LEDs to display status information. See Table 6 for a listing of the front panel LEDs and their indications.

 

 

Table 6. Front Panel LEDs

Unit

Label

Indication

Description

 

LP1/LP2

! Off

No span power is present

239 H4R

NET

" Solid Green

Synchronized with an Signal to Noise Ratio (SNR) margin greater than

 

1223445L1

 

 

the recommended SNR Margin Alarm Threshold

 

 

 

 

 

Fast Flashing Green

(Flashing 3 times per second) Attempting to synchronize with the

 

 

 

H4TU-C

 

 

Slow Flashing Green

(Flashing once per second) Synchronized with a SNR margin greater

LP1

 

 

than the recommended SNR Margin Alarm Threshold, and the attenua-

NET

 

 

tion is greater than the user recommended Loop Attenuation Alarm

LP2

 

 

LP1

 

 

Threshold

CUST

 

" Solid Yellow

Synchronized with a SNR margin greater than 0 dB but less than the

LP2

 

LL /RL

 

 

recommended SNR Margin Alarm Threshold

(Y) (G)

 

Flashing Yellow

Synchronized with a SNR margin greater than 0 dB but less than the

 

 

 

 

 

recommended SNR Margin Alarm Threshold, and the attenuation is

 

 

 

greater than the user recommended Loop Attenuation Alarm Threshold

 

" Solid Red

Synchronized with a SNR margin of 0 dB

 

Flashing Red

(Flashing once per second) Synchronized with a SNR margin of 0 dB,

 

 

and the attenuation is greater than the recommended Loop Attenuation

 

 

Alarm Threshold

 

 

 

LP1/LP2

! Off

No span power is present

CUST

" Solid Green

Synchronized with an Signal to Noise Ratio (SNR) margin greater than

 

 

 

the recommended SNR Margin Alarm Threshold

 

Fast Flashing Green

(Flashing 3 times per second) Attempting to synchronize with the

 

 

H4TU-R

 

Slow Flashing Green

(Flashing once per second) Synchronized with a SNR margin greater

 

 

than the recommended SNR Margin Alarm Threshold, and the attenua-

 

 

tion is greater than the user recommended Loop Attenuation Alarm

 

 

Threshold

 

" Solid Yellow

Synchronized with a SNR margin greater than 0 dB but less than the

 

 

recommended SNR Margin Alarm Threshold

 

Flashing Yellow

Synchronized with a SNR margin greater than 0 dB but less than the

 

 

recommended SNR Margin Alarm Threshold, and the attenuation is

 

 

greater than the user recommended Loop Attenuation Alarm Threshold

 

" Solid Red

Synchronized with a SNR margin of 0 dB

 

Flashing Red

(Flashing once per second) Synchronized with a SNR margin of 0 dB,

 

 

and the attenuation is greater than the recommended Loop Attenuation

 

 

Alarm Threshold

 

 

 

LL/RL

" Solid Yellow

Indicates that a loopback is active at the H4R towards the H4TU-C

 

Flashing Yellow

H4R is armed but not in loopback

 

" Solid Green

Indicates that a loopback is active at the H4R towards the H4TU-R

61223445L1-5D

9

Maintenance

239 H4R Installation and Maintenance Practice

 

 

8.MAINTENANCE

The HDSL4 239 T1 HDSL4 Repeater (H4R) requires no routine maintenance for normal operation. In case of equipment malfunction, perform an in-band loopback from the Central Office. If a malfunction is confirmed, replace the unit.

The ADTRAN 239 H4R has looping capability through the channel allowing digital loopback in fault isolation. The loopback is activated remotely. The type of loopbacks the H4R supports will be dependent upon the loopback capabilities of the transceiver units utilized on the circuit. Refer to the Installation and Maintenance Practice of the specific H4TU-C or H4TU-R for a list of loopback codes.

Performance monitoring, diagnostics, and loopbacks are also available from the craft interface at the H4TU-C or H4TU-R.

CAUTION

When testing indicates a faulty H4R, refer to the housing Installation and Maintenance Practice for the entry and pressurization control, the replace the faulty unit.

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 “Appendix A, Warranty” for further information.

9.SPECIFICATIONS

Specifications for the HDSL4 239 T1 HDSL4 Repeater (H4R) are detailed in Table 7.

10

61223445L1-5D

239 H4R Installation and Maintenance Practice

Specifications

 

 

Table 7. 239 T1 HDSL4 Repeater (H4R) Specifications

 

 

Specification

Description

 

 

Loop Interface

 

 

Modulation Type:

16 TC PAM

Mode:

Full Duplex, Partially overlapped echo canceling

Number of Pairs:

2

Line Rate:

1.552 Mbps

Baud Rate:

261.333 k baud

Loop Loss:

Refer to “HDSL4 Deployment Guidelines” on page 6.

Bridged Taps:

Single Taps < 2000 ft., Total Taps < 2500 ft.

Performance:

Compliant with T1.418-2000 (HDSL4 Standard, Issue 2)

H4TU-C Transmit Power (Data) Level:

14.1 ±0.5 dBm (0 to 400 kHz)

H4TU-C Transmit Power (Activation) Level:

14.1 ±0.5 dBm (0 to 307 kHz)

Input Impedance:

135 ohms

Maximum Loop Resistance:

Refer to “HDSL4 Deployment Guidelines” on page 6.

Return Loss:

12 dB (50 kHz to 200 kHz)

 

 

Power

Tested with the ADTRAN H4TU-R (P/N 1223426L1) and H4R (P/N 1223445L1)

H4R Input Power

5.0 watts (span powered by H4TU-C)

 

 

Clock

 

 

Clock Sources:

DSX-1 Derived (with HDSL4 frame bit stuffing)

Internal Clock Accuracy:

±25 ppm (Exceeds Stratum 4), Meets T1.101 Timing

 

Requirements

 

 

Tests

 

 

Diagnostics:

Loopback initiated with in-band codes or from H4TU-C or

 

H4TU-R craft interface

 

 

Physical

 

 

239 Repeater, Apparatus Shelf-Mounted, Weight:

< 1lb.

 

 

Environment

 

 

Standard Operating Temperature:

–40ºC to +70ºC

:Storage Temperature:

–40ºC to +85ºC

 

 

Compliance

UL 60950

NEBS Level 3 (SR-3580)

FCC 47CFR Part 15, Class A

Part Number

239 T1 HDSL4 Repeater (H4R): 1223445L1

61223445L1-5D

11

Specifications

239 H4R Installation and Maintenance Practice

 

 

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12

61223445L1-5D

Appendix A

Warranty

WARRANTY AND CUSTOMER SERVICE

ADTRAN will replace or repair this product within the warranty period if it does not meet its published specifications or fails while in service. Warranty information can be found at www.adtran.com/warranty.

Refer to the following subsections for sales, support, Customer and Product Service (CAPS) requests, or further information.

ADTRAN Sales

Pricing/Availability: 800-827-0807

ADTRAN Technical Support

Pre-Sales Applications/Post-Sales Technical Assistance: 800-726-8663

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: (256) 963-8722

Repair and Return Address

Contact CAPS prior to returning equipment to ADTRAN.

ADTRAN, Inc. CAPS Department

901 Explorer Boulevard Huntsville, Alabama 35806-2807

61223445L1-5D

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239 H4R Installation and Maintenance Practice

®

A-2

61223445L1-5D