ADTRAN FNID Deployment Guide

Section 61245201L1-5C

Issue 3, September 1999

CLEI Code: NCDIFBH4 _ _

FNID and T200 FNID

Fractional T1 Network Interface Device

Installation and Maintenance

CONTENTS

1.

GENERAL ............................................................................ 1

2.

INSTALLATION .................................................................. 2

3.

CONNECTIONS ................................................................... 3

4.

DSL SYSTEM TESTING .................................................... 4

5.

CONTROL PORT OPERATION ......................................... 4

6.

DSL DEPLOYMENT GUIDELINES ................................. 11

7.

TROUBLESHOOTING PROCEDURES ........................... 12

8.

MAINTENANCE ................................................................ 12

9.

PRODUCT SPECIFICATIONS .......................................... 12

10. WARRANTY AND CUSTOMER SERVICE .................... 12

Appendix A. FT1 Loopbacks ................................................... A-1

FIGURES

Figure 1.

Figure 2.

ADTRAN FNID ...................................................... 1

FNID Option Switch Locations .............................. 2

Figure 3.

FNID Network Loop Connection Locations .......... 4

Figure 4.

RS-232 (DB9) Pin Assignments ............................. 4

Figure 5.

Figure 6.

Figure 7.

Figure 8.

Introductory Menu Screen ...................................... 7

HDSL Main Menu Screen ...................................... 7

Current System Status Screen ................................. 8

Performance History Screen ................................... 8

Figure 9.

Loopback Options Screen ....................................... 9

Figure 10.

Self Test Options Screen ........................................ 9

Figure 11.

Provisioning Options Screen ................................. 10

Figure 12.

Troubleshooting Screen ......................................... 10

Figure 13.

DSL Deployment Guidelines ................................. 11

Figure A-1. FT1 Loopbacks .................................................... A-1

Figure A-2. FT1 DP Network Loopback ................................. A-1

Figure A-3. FT1 DP CPE Loopback ....................................... A-1

Figure A-4. FT1 Repeater #1 or # 2 Network Loopback ........ A-2

Figure A-5. FNID Network Loopback .................................... A-2

Figure A-6. FNID CPE Loopback ........................................... A-2

TABLES

Table A.

Table B.

Table C.

Table D.

Table E.

Table F.

Front Panel Functions ............................................. 3

FNID Card Edge Pin Definitions ........................... 3

Definition of Screen Abbreviations ........................ 5

Loop Insertion Loss Data ....................................... 11

Troubleshooting Guide .......................................... 12

FNID Unit Specifications ...................................... 13

Table A-1.

FT1 Loopback Select Codes ................................ A-3

3

2

S

2

FNID

1245201L1

ESF

(YEL)

B8ZS

(YEL)

DSL

DS1

SF

(GRN)

AMI

(GRN)

LBK

L

B

K

LOC

REM

M

TX

O

N

RX

Figure 1. ADTRAN FNID

1. General

This practice is an installation and maintenance (I/M) guide for the ADTRAN Fractional T1 Network

Interface Device (FNID). Figure 1 is an illustration of the ADTRAN FNID.

Revision History

This practice has been reissued to reflect additional support detail for two FT1 repeater applications.

The ADTRAN FNID is a network terminating unit used to deploy a fractional T1 circuit using 2-wire metallic facilities on CSA loops. This practice is written to support both the T200 FNID circuit pack

(P/N 1245201L1) and the FNID standalone

(P/N 4245201L1) units.

The FNID is housed in a standalone metal enclosure.

The T200 FNID card plugs into a standard Type

200/400 multiple mounting shelf.

61245201L1-5C 1 trademarks, registered trademarks, or trade names of their respective holders.

With the exception of the physical dimensions of the units, the FNID and T200 FNID units are functionally identical. The FNID terminates local loop DSL signals originating from the Central Office (CO) unit and transforms the DSL signal into fractional T1 signals to be delivered to the customer.

The DSL local loop operates over a single twisted pair. The FNID communicates over the twisted pair to the FT1 DP (ADTRAN part numbers 1242040L1,

1242046LX, 1242047LX, 1242048LX, 1245205L1,

1245206L1, 1245207L1, 1245208L1) located at the

CO. The payload between FT1 DP and FNID is programmable from the faceplate rotary switch as follows:

2 channels (minimum) .......... 128 kbps

3 channels ............................. 192 kbps

4 channels ............................. 256 kbps

5 channels ............................. 320 kbps

6 channels ............................. 384 kbps

7 channels ............................. 448 kbps

8 channels ............................. 512 kbps

9 channels ............................. 576 kbps

10 channels ........................... 640 kbps

11 channels ........................... 704 kbps

12 channels (maximum) ....... 768 kbps

The system carries a small amount of overhead used for maintenance and performance. The FNID delivers a standard ANSI T1.403 interface to the customer equipment at 1.544 Mbps. The extra bandwidth is nulled out in the form of idle stuffed channels.

2. INSTALLATION

C A U T I O N !

SUBJECT TO ELECTROSTATIC DAMAGE

OR DECREASE IN RELIABILITY.

HANDLING PRECAUTIONS REQUIRED.

After unpacking the unit, immediately inspect it for possible shipping damage. If damage is discovered, file a claim immediately with the carrier, then contact

ADTRAN Customer Service (see subsection 10 of this practice).

FNID Option Selections: Configuration strap P1 selects FNID settings. Figure 2 illustrates P1 location and options.

P1 o o o

P1 o o o

Figure 2. FNID Option Switch Locations

P1 selects DS1 Tx attenuation to the customer. It is selectable between 0dB and -15dB.

Provisioning options (selecting B8ZS/AMI or SF/

ESF) are automatically controlled on the FNID when selected at the FT1 DP.

The settings on the FT1 DP are encoded and transmitted to the FNID once the circuit has achieved synchronization.

Front Panel Indicators: There are five status indicators on the front panel. See Table A for a description of these indicators.

2 Section 61245201L1-5, Issue 3 61245201L1-5C

Table A. Front Panel Functions

Indicator Description

DSL .................

Indicates five possible states of the quality of the DSL signal

Off ........................ No synchronization of FT1 DP and FNID

Red ........................ Poor signal quality (

≥

10 -7 BER)

Yellow .................. Marginal signal quality (

≤

2 dB margin above 10 -7 BER)

Green .................... Good signal quality (

≤

2 dB margin above 10 -7 BER)

Blinking ................ An error detected on the loop will cause this LED to blink briefly

DS1 ..................

This LED indicates three possible conditions described below.

Off ........................ The customer-side DS1 signal is absent or in a format that does not match the provisioned options

Blinking ................ Indicates an error has been detected on the DS1 interface

On Solid ............... The customer-side DS1 signal is present and synchronized

LBK .................

This LED indicates two possible loopback states as described below.

Off ........................ Unit is not in loopback

On Solid ............... Local (FNID) loopback is active

RS-232 .............

DB9 connector for craft interface. Allows connection to controlling terminal. For further information, refer to subsection 6 of this practice.

REM LBK .......

Remote Loopback. Push button to toggle Loopback active/inactive.

LOL LBK ........

Local Loopback. Push button to toggle Local Loopback active/inactive.

3. CONNECTIONS

All connections of the FNID are made through card edge connectors. Table B gives the card edge pin assignments for the FNID circuit pack. The circuit pack operates in either the standalone chassis

(P/N 1242034L2), the ADTRAN HR4 HDSL shelf

(P/N 1242008L1), or the ADTRAN HR12 HDSL shelf (P/N 1242007L1).

When the circuit pack is installed in any of the FNID enclosures, all connections are made through the enclosure backplanes. See the following ADTRAN documents for more information:

• 61242007L1-5, HR12 I/M

• 61242008L1-5, HR4 I/M

• 61242034L2-5, T400 Single Mount I/M

(removable RJ-48 jacks)

NOTE: Ensure chassis ground is properly connected for either standalone or shelf-mounted applications.

61245201L1-5C Section 61245201L1-5, Issue 3

Table B. FNID Card Edge Pin Definitions

Pin Designation Description

1 ................. CH GND .......... Chassis ground

5 ................. DS1-T1 ............ DS1 Receive Out tip

(to Customer Interface)

7 ................. H1-T ................ DSL Loop Tip (facility)

11 ............... CH GND .......... Chassis ground

13 ............... H1-R ................ DSL Loop ring (facility)

15 ............... DS1-R1 ............ DS1 Receive Out ring

(to Customer Interface)

17 .......................................... -48 Return

27 ............... FG .................... Frame Ground

35 .......................................... -48 VDC

49 ............... DS1-R .............. DS1 Transmit In ring

(from Customer Interface)

55 ............... DS1-T .............. DS1 Transmit In tip

(from Customer Interface)

3

4. DSL SYSTEM TESTING

The ADTRAN DSL system provides extensive ability to monitor the status and performance of the DS1 signals and DSL loop signals. The front panel LEDs on the FNID are explained in subsection 2 of this practice. Additional testing features are described in this section. Specifically, the Bantam jacks on the front panel of the FNID are described.

DS1 MON Bantam Jack

The FNID provides a dual Bantam jack on the front panel. This jack, labeled “MON,” provides a non-intrusive access point for monitoring the transmit and receive signals at the DS1 interface point.

5. CONTROL PORT OPERATION

The FNID provides a faceplate-mounted DB9 connector that supplies an RS-232 interface for connection to a controlling terminal. The pinout of the DB9 is illustrated in Figure 4.

6

7

8

9

3

4

1

2

5

TXD (Transmit Data)

RXD (Receive Data)

SGN (Signal Ground)

NOTE: MON Rx provides access to the DS1 input from the customer’s equipment. MON Tx provides access to the DS1 output of the FNID toward the customer.

FNID Loopbacks

There are two loopbacks available to the FNID. FNID network loopback loops the FT1 signal back toward the network. FNID CPE loopback loops the FT1 signal back toward the customer. FNID network loop connection locations are illustrated in Figure 3.

Appendix A contains diagrams and descriptions of the

FT1 system loopback capabilities.

Figure 4. RS-232 (DB9) Pin Assignments

The terminal interface operates at data rates from

2.4 kbps to 19.2 kbps. The asynchronous data format is fixed at 8 data bits, no parity, and 1 stop bit. The supported terminal type is VT-100 or compatible.

NOTE: If you are using a personal computer (PC) with terminal emulation capability, be sure to disable any power saving programs.

Otherwise, communication between the PC and the HDSL unit may be disrupted, resulting misplaced characters or screen timeouts.

DS1

T1 TO CPE

R1 TO CPE

T FROM CPE

DS1

R FROM CPE

T1 LOOP1

R1 LOOP1

GND

-48V

Operation

A terminal session is initiated by entering multiple space bar characters, which are used by the FNID to determine the speed of the terminal. Once the speed has been determined, an Introductory menu will appear, as illustrated in Figure 5. For abbreviations used in the screen diagrams, refer to Table C.

From the Introductory menu, the Main menu may be selected. The Main menu provides access to detailed performance and configuration information, as illustrated in Figure 6, HDSL Main Menu Screen.

4

Figure 3. FNID Network Loop Connection

Locations

Section 61245201L1-5, Issue 3 61245201L1-5C

Table C. Definition of Screen Abbreviations

Abbreviation Definition

ES ......................... Errored seconds

DS1 (SF) ....... Second in which a BPV or frame bit error occurs

DS1 (ESF) .... Second in which a BPV or CRC error occurs

DSL .............. Second in which a CRC error occurs

SES ....................... Severely errored seconds

DS1 (SF) ....... Second in which 1554 BPVs or 8 frame bit errors occur

DS1 (ESF) .... Second in which 1544 BPVs or 320 CRC errors occur

DSL .............. Second in which 165 CRC errors occur

UAS ...................... Unavailable seconds

DS1 ............... Second in which there is a loss of signal or sync

DSL .............. Second in which there is a loss of signal or sync

SF .......................... Superframe format

ESF ....................... Extended superframe format

B8ZS ..................... Binary 8-zero substitution

AMI ...................... Alternate mark inversion

LBO ...................... Line build-out

BPV ...................... Bipolar violation

DS1 ............... Second in which a bipolar violation occurs

NIU ....................... T1 network interface unit

S/N ........................ Serial number

15M ...................... Fifteen-minute period

24H ....................... Twenty-four-hour period

From the Main menu the following screens can be accessed.

1. Current System Status

2. Performance History

3. ADTRAN Information

4. Loopback Options

5. Self Test

6. Provisioning

7. Troubleshooting

The Current System Status screen, illustrated in

Figure 7, provides quick access to status information for both the FT1-DP and FNID. The Elapsed Time display indicates the period of time since the unit began collecting performance information.

Current information for the DSL and DS1 interfaces is consolidated on this screen. A key to the information provided is found in the center of the screen. Arrows indicate the key applies to both the FT1 DP and FNID.

LOSS ........................ Pulse Attenuation Measurement

SYNC ....................... HDSL Loop 1 Sync Status

ES 15M/24H ............ Errored Seconds

SES 15M/24H .......... Severely Errored Seconds

UAS 15M/24H ......... Unavailable Seconds

For example: ES 012/264 indicates that 12 errored seconds have occurred in the current 15-minute period while a total of 264 errored seconds have occurred in the last 24 hours.

61245201L1-5C Section 61245201L1-5, Issue 3 5

A measure of signal quality for each HDSL loop is displayed in graphic form on the bottom right and left of the screen.

The measure is from 0 (poor signal quality) to 9 (excellent signal quality). Guidelines for interpreting the indicators are:

0 Noise margin is

≤

0 dB (

≈

10 -7 BER)

1-8 Margin measurement above 10 -7 BER in dB

9 Margin is

≥

9 dB (excellent quality) above 10 -7 BER

Predicting performance based upon signal quality varies with each loop. Generally, a noise margin of 0 or higher will support a bit error rate of better than 10 -7 .

The Performance History screen is illustrated in Figure 8.

At each 15-minute interval, the performance information is transferred to the 15-minute performance data registers accessed from the Performance History screen. At each

24-hour interval, the performance data is transferred into the 24-hour performance data register also accessed using this screen.

At the Current System Status screen, type “Z” in order to reset performance registers to zero at both the Current

System Status and Performance History screens.

Figure 9 depicts the FT1 Loopback Options screen while Figure 10 depicts the Self-Test Options screen.

Loopbacks and Self-Test may be evoked or terminated using these screens. A status of current loopback conditions is also provided.

Figure 11 shows the Provisioning Options screen.

Provisioning may only be viewed from the FNID at all times. Provisioning is controlled from the FT1 DP.

The Troubleshooting Display, shown in Figure 12, graphically presents an FT1 circuit. The unit reviews red, yellow, and blue alarm conditions in the circuit to automatically predict where a fault is located. Once a fault location is suspected, the corresponding portion of the circuit on the screen is highlighted and a message describing the failure will appear.

6 Section 61245201L1-5, Issue 3 61245201L1-5C

ADTRAN

901 Explorer Boulevard

Huntsville, Alabama 35806-2807

For Information or Technical Support,

Normal Support Hours ( 7am - 7pm CST ) or Emergency Support Hours ( 7x24 )

Voice Toll Free: 800.726.8663 Fax: 256.963.6217

Voice: 256.963.8100 Internet: www.adtran.com

—————————————————————————————--------------------------------------——————————-

FT1-DP INFORMATION SIGNAL QUALITY FNID INFORMATION SIGNAL QUALITY

————----------—————— [ ] 9 —————----------————— [ ] 9

S/N : [ ] 8 S/N : DATA NOT AVAIL [ ] 8

CLEI: [ ] 7 CLEI: [ ] 7

MANF: / [ ] 6 MANF: [ ] 6

[ ] 5 [ ] 5

[ ] 4 [ ] 4

[ ] 3 [ ] 3

[ ] 2 [ ] 2

[ ] 1 [ ] 1

[ ] 0 [ ] 0

AT FT1-DP AT FNID

Press “M” to view Main Menu.

Figure 5. Introductory Menu Screen

ADTRAN FT1 MAIN MENU

1) CURRENT SYSTEM STATUS

2) PERFORMANCE HISTORY

3) ADTRAN INFORMATION

4) LOOPBACK OPTIONS

5) SELF-TEST

6) PROVISIONING

7) TROUBLESHOOTING

Choose a screen by pressing the corresponding number.

61245201L1-5C

Figure 6. HDSL Main Menu Screen

Section 61245201L1-5, Issue 3 7

8

FT1-DP CURRENT SYSTEM STATUS FNID

NETWORK (DSL) ELAPSED TIME 00:08:18 CUSTOMER (DSL)

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

00 dB <- LOSS -> 00 dB

NO <- SYNC -> NO

000/00000 <- ES 15M/24H -> 000/00000

000/00000 <- SES 15M/24H -> 000/00000

498/00498 <- UAS 15M/24H -> 498/00498

LOOPBACKS INACTIVE LOOPBACKS INACTIVE

FT1-DP SIGNAL QUALITY FNID DS1 FNID SIGNAL QUALITY

[ ] 9 -------------------- [ ] 9

[ ] 8 FRAME ——> SF [ ] 8

[ ] 7 CODE ——> AMI [ ] 7

[ ] 6 LBO ——> 0 dB [ ] 6

[ ] 5 BPV ——> 00000 [ ] 5

[ ] 4 ES ——> 00000 [ ] 4

[ ] 3 SES ——> 00000 [ ] 3

[ ] 2 UAS ——> 00000 [ ] 2

[ ] 1 ALARMS ——> NONE [ ] 1

[ ] 0 NO SEALING CURRENT [ ] 0

Press “Z” to zero registers, “M” for Main Menu.

Figure 7. Current System Status Screen

PERFORMANCE HISTORY <VIEW 2 - FNID DS1 RECEIVER>

24 HOUR REGISTERS 15 MINUTE REGISTERS

—-ES-----SES-- —ES-SES-----ES-SES-

00000 00000 <-- CURRENT --> 000 000

-1: ----- ----- <-- --> -1: --- --- -17: --- ---

-2: ----- ----- | | -2: --- --- -18: --- ---

-3: ----- ----- | | -3: --- --- -19: --- ---

-4: ----- ----- | | -4: --- --- -20: --- ---

-5: ----- ----- |PREVIOUS | -5: --- --- -21: --- ---

-6: ----- ----- | | -6: --- --- -22: --- ---

-7: ----- ----- <-- | -7: --- --- -23: --- ---

| -8: --- --- -24: --- ---

VIEW LOCATION DIAGRAM | -9: --- --- -25: --- ---

| -10: --- --- -26: --- ---

-->|F| |F|--> | -11: --- --- -27: --- ---

|T| |N| | -12: --- --- -28: --- ---

|1|<--3-----DSL-----4-->|I| | -13: --- --- -29: --- ---

|D| |D| | -14: --- --- -30: --- ---

<--|P| | |<--2 | -15: --- --- -31: --- ---

--> -16: --- --- -32: --- ---

Press view number to select view, “M” to return to Main Menu

Figure 8. Performance History Screen

Section 61245201L1-5, Issue 3 61245201L1-5C

LOOPBACK OPTIONS

FT1-DP FNID

_____ _____

| | | |

| | | |

—-->| | | |<—-

| | | |

NET | |<===========================>| | CUST

| | | |

<—--| | | |—>

| | | |

| | | |

|_____| |_____|

1) LOOPBACK TO NETWORK AT FT1-DP =INACTIVE

2) LOOPBACK TO CUSTOMER AT FT1-DP =INACTIVE

3) LOOPBACK TO NETWORK AT FNID =INACTIVE

4) LOOPBACK TO CUSTOMER AT FNID =INACTIVE

Press corresponding number to toggle loopback option.

Press “M” for Main Menu.

Figure 9. Loopback Options Screen

SELF-TEST

Press “S” to initiate FT1-FP and FNID self-tests.

Press “M” to return to the Main Menu.

61245201L1-5C

Figure 10. Self-Test Options Screen

Section 61245201L1-5, Issue 3 9

PROVISIONING

___________________________________________________ ______________________

| | |

| PROVISIONS CURRENT SETTINGS | HARDWARE SETTINGS |

| ------------------------------------------ | ----------------- |

| 1. DS1 (FNID) LINE CODE = B8ZS | B8ZS |

| 2. DS1 (FNID) FRAMING = ESF | ESF |

| 3. DS1 (FNID) TX LEVEL = 0 dB | |

| 4. LOOPBACK TIMEOUT = 20 MIN | 20 MIN |

| 5. LATCHING LOOPBACK = ENABLED | ENABLED |

| 6. DSO SEQUENCE = ALTERNATING | ALTERNATING |

| 7. NUMBER OF DSOS = 12 (768Kbps) | 12 (768Kbps) |

|___________________________________________________|______________________|

10

Press: “n” — to change corresponding provision (ex. “2” for FRAMING)

“H” — to copy hardware settings to current settings

“I” — to implement and save current setting changes

“M” — to return to the main menu

Figure 11. Provisioning Options Screen

TROUBLESHOOTING DISPLAY

FT1-DP FNID

_____ _____

| | | |

| | | |

—-->| | | |<—--

| | | |

NET | |<===========================>| | CUST

| | | |

<---| | | |--—>

| | | |

| | | |

|_____| |_____|

ALARMS: PROBLEM INDICATED:

FT1-DP RED CHANNEL BANK ALARM

FT1-DP RED DSL LOSS

Press “M” for Main Menu.

Figure 12. Troubleshooting Screen

Section 61245201L1-5, Issue 3 61245201L1-5C

6. DSL DEPLOYMENT GUIDELINES

The ADTRAN FT1 DSL system is designed to provide Fractional DS1-based services over loops designed to comply with Carrier Service Area (CSA) guidelines. CSA deployment guidelines are given below.

1 . All loops are non-loaded only.

2. For loops with 26-AWG cable, the maximum loop length including bridged tap lengths is 9 kft.

3. For loops with 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

12 - {(3*L 26 )/9} - L BTAP (in kft)

L 26 = Total length of 26-AWG cable excluding bridged taps (in kft)

L BTAP = Total length of all bridged taps (in kft)

This deployment criteria is summarized in the chart shown in Figure 13.

An approximation for the maximum amount of wideband noise on a DSL local loop as measured by a

50 kbps filter is

≤

31 dBrn.

An approximation for the maximum level of impulse noise as measured using a 50 kbps filter on an DSL loop is

≤

50 dBrn.

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.

6

5

8

7

12

11

10

9

INVALID DSL CABLE LENGTHS

2.5

2.0

TOTAL

BRIDGED

TAP

1.5

1.0

LENGTH

0.5

0.0

(KFT)

2

1

4

3

0

0

VALID DSL CABLE LENGTHS

1 2 3 4 5 6 7 8

WORKING LENGTH OF 26 GAUGE CABLE (KFT)

9

Figure 13. DSL Deployment Guidelines

Recommended maximum local loop loss information for PIC cable at 70

°

F, 135

Ω

, resistive termination is provided in Table D.

Table D. Loop Insertion Loss Data

Frequency (Hz) Maximum Loss (dB)

3,000 .......................... 12.0

10,000 .......................... 15.0

50,000 .......................... 25.5

100,000 .......................... 30.0

150,000 .......................... 32.75

200,000 .......................... 35.25

61245201L1-5C Section 61245201L1-5, Issue 3 11

7. TROUBLESHOOTING PROCEDURES

Table E is a troubleshooting guide for the FNID.

8. MAINTENANCE

The ADTRAN FNID requires no routine maintenance.

In case of equipment malfunction, use the faceplate

Bantam jack connectors to help locate the source of the problem.

ADTRAN does not recommend that repairs be performed in the field. Repair services may be obtained by returning the defective unit to the

ADTRAN Customer Service RMA Department.

9. PRODUCT SPECIFICATIONS

Specifications for the FNID are provided in Table F.

10. WARRANTY AND CUSTOMER SERVICE

ADTRAN will replace or repair this product within five years from the date of shipment, if the product does not meet its published specifications or if it fails while in service. For detailed warranty, repair, and return information, refer to the ADTRAN Telco

Network Equipment Warranty and Return Policy and

Procedure, document 6000008-10A.

Return Material Authorization (RMA) is required prior to returning equipment to ADTRAN. ADTRAN does not recommend that repairs be performed in the field.

For service, RMA requests, or further information, contact one of the following numbers:

ADTRAN Customer Service:

ADTRAN Telco Technical Support . (800) 726-8663

Standard support hours ..................... Monday-Friday

7 a.m. - 7 p.m. CST

Emergency support ......... 7 days/week, 24 hours/day

Sales .................................................. (800) 827-0807

RMA (repair service) ....................... (256) 963-8722

Repair and Return Address:

ADTRAN, Inc.

Customer and Product Support (CAPS) Department

901 Explorer Boulevard

Huntsville, Alabama 35806-2807

Table E. Troubleshooting Guide

Condition Solution

All front panel indicators are off.

1. Verify that the FNID is properly seated in the housing.

2. Make sure power supply feed the FNID is in good working condition.

3. If Steps 1 and 2 pass, replace the FNID.

Power is OK, but does not achieve loop sync (DSL LED is off.)

1. Verify that the loop conforms with CSA guidelines (not too long, etc.).

2. Verify that the loop loss at 200 kHz is not greater than 36 dB.

3. Verify that noise on the DSL loop is within acceptable limits.

4. If Steps 1 through 4 pass and loop sync is still not available, replace the FNID.

12 Section 61245201L1-5, Issue 3 61245201L1-5C

Table F. FNID Unit Specifications

Loop Interface:

Modulation Type ................................................. 2B1Q

Mode .................................................................... Full Duplex, Echo Cancelling

Number of Pairs .................................................. One

Bit Rate ................................................................ 784 kbps

Baud Rate ............................................................ 392K baud

Service Range ..................................................... Defined by Carrier Service Area Guidelines

Loop Loss ............................................................ 36 dB maximum @ 200 kHz

Bridged Taps ....................................................... Single Taps < 2 kft, Total Taps < 2.5 kft

Performance ........................................................ Compliant with Bellcore TA-NWT-001210

Return Loss ......................................................... 20 dB (40 kHz to 200 kHz)

DSL Tx Signal Level .......................................... 13.5 dBm

Input Impedance .................................................. 135

Ω

DS1 Channelization ............................................ Channels 1-12

Customer Interface:

4-wire DS1 (T1.403-compatible)

DS1 Signal Output Level .................................... Programmable through FT1 DP at 0, or -15 dB

DS1 Input Signal Level ...................................... 0, or -15 dB

DS1 Line Coding ................................................ AMI, B8ZS

DS1 Framing Format .......................................... SF, ESF

Power:

Span Power .......................................................... Selectable: less than -140 VDC (Class A2 with GFI circuit), or less than -190 VDC

(Class A2 with GFI circuit)

Locally Powered ................................................. -48 V at 75 mA

Clock Sources:

Clock Sources ..................................................... Internal, DSL Loop Derived

Internal Clock Accuracy .....................................

±

25 ppm, (exceeds Stratum 4). Meets T1.101 timing requirements.

Tests:

Diagnostics .......................................................... Loopback (FNID), initiated with DDS latching loopbacks, initiated with FT1 DP command. Self-Test.

Physical:

Dimensions .......................................................... 2.25" High, 8.75" Wide, 10.25" Deep

Weight ................................................................. 4 pounds (standalone)

Environment:

Temperature ........................................................ Operating (Standard): -40

°

to +70

°

C; Storage: -40

°

to +85

°

C

Part Numbers:

Circuit Pack ......................................................... 1245201L1

61245201L1-5C Section 61245201L1-5, Issue 3 13

Appendix A

FT1 Loopbacks

1. GENERAL

This Appendix is an overall reference to the loopback capabilities of the ADTRAN Fractional T1 system.

Included in this Appendix is a description of the FT1 loopbacks and the methods for activating the FT1 loopbacks.

2. FT1 LOOPBACKS

Figure A-1 shows the application from the central office (CO) to customer premises. The FT1 Repeaters are shown for convenience and are not necessary parts of the FT1 network. The loopbacks shown are as follows:

A. FT1 DP network loopback

B. FT1 DP CPE loopback

C. FT1 Repeater # 1 network loopback

D. FT1 Repeater # 2 network loopback

E. FNID network loopback

F. FNID CPE loopback

There are two loopbacks available to the FT1 DP.

The FT1 DP network loopback loops the FT1 signal back to the network. The FT1 DP CPE loopback loops the FT1 signal back to the customer.

The FT1 DP network loopback is a digital loopback toward the CO (see Figure A-2). This loopback is initiated by the OCU latching loopback command

(N1010101), or by the craft interface, when available.

The OCU latching loopback code is detected in the primary DS0 of the FT1 circuit (the channel where the

FT1 DP is physically installed) to control the FT1 circuit looping. When the FT1 circuit is looped, all

DS0s in use will be looped back toward the network.

The DS0s will be transmitted on to the customer.

The FT1 DP CPE loopback is a digital loopback toward customer premises as shown in Figure A-3.

This loopback is initiated by the REM LBK button on the FNID, or by the craft interface when available.

When the FT1 circuit is looped, all DS0s in use will be looped back toward the customer. All DS0s in use will be filled with all 1s and sent toward the network.

DSX-1

Interface

FT1 DP

Central Office A

D4

Channel Bank

B C

FT1

Repeater

D

FNID

E

T1 NIU

Figure A-1. FT1 Loopbacks

DSX-1

Interface

FT1 DP

Central Office

D4

Channel Bank

HDSL

FT1

Repeater

Local Loop

FNID

DS1

Interface

Customer Premises

DSX-1

Interface

Figure A-2. FT1 DP Network Loopback

FT1 DP

HDSL

Local Loop

FNID

DS1

Interface

Customer Premises

Central Office

D4

Channel Bank

Figure A-3. FT1 DP CPE Loopback

Customer

Premises

Equipment

61245201L1-5C Section 61245201L1-5, Issue 3 A-1

There is one loopback available to the FT1 Repeaters.

The FT1 Repeater Network loopback is a digital loopback toward the CO as shown in Figure A-4. The loopbacks are initiated by the DDS latching loopback codes for NEI Position 1 (N1000001) for FT1 #1 or

NEI Position 2 (N100001) for FT1 Repeater # 2. The

NEI latching loopback is detected in the primary DS0 of the FT1 circuit, the channel where the FT1 DP is physically installed, to control the looping of the FT1 circuit. When the FT1 circuit is looped, all DS0s in use will be looped. The DS0s in use will also be transmitted on to the customer.

There are two loopbacks available to the FNID. The

FNID network loopback loops the FT1 signal back toward the network. The FNID CPE loopback loops the FT1 signal back toward the customer.

The FNID network loopback is a digital loopback toward the CO as illustrated in Figure A-5. This loopback is initiated by the DDS latching loopback code for NEI Position 1 (N1000001) for a non-repeatered loop, or NEI Position 2 (N1000001) for a single repeater loop or by NEI Position 3

(N1000001) for a two repeater loop; by the craft interface when available, or by the REM LBK button at the FT1 DP. The NEI Position 1 latching loopback is detected in the primary DS0 of the FT1 circuit (the channel in which the FT1 DP is physically installed), to control the looping of the FT1 circuit. When the

FT1 circuit is looped, all DS0s in use will be looped.

The DS0s in use will be filled with all 1s and transmitted toward the customer.

The FNID CPE loopback is a digital loopback toward customer premises as shown in Figure A-6. This loopback is initiated by the craft interface, when available. When the FT1 circuit is looped, all DS0s in use will be looped. The data in the DS0s in use will be transmitted toward the network.

A-2

DSX-1

Interface FT1 DP FNID

DS1

Interface

HDSL

Local Loop

Central Office

D4

Channel Bank

Figure A-4. FT1 Repeater # 1 or 2 Network Loopback

Customer Premises

DSX-1

Interface FT1 DP

Central Office

D4

Channel Bank

HDSL

Local Loop

Figure A-5. FNID Network Loopback

FNID

DS1

Interface

Customer Premises

DSX-1

Interface FT1 DP

Central Office

D4

Channel Bank

HDSL

Local Loop

Figure A-6. FNID CPE Loopback

Section 61245201L1-5, Issue 3

FNID

DS1

Interface

Customer Premises

61245201L1-5C

3. LOOPBACK ACTIVATION/DEACTIVATION

This section describes loopback activation and deactivation methods for the ADTRAN Fractional T1 system. Loopback activation and deactivation is controlled with the push-button located on the front panel, through craft interface, or latching loopback codes.

Latching loopbacks for the FT1 system are activated by transmitting the following latching loopback sequence in the primary DS0 of the FT1 system:

A. Minimum of 35 transition in progress (TIP) bytes

(N0111010).

B. Minimum of 35 loopback select code (LSC) bytes as defined in Table I.

Both the FNID and the FT1 DP have a push-button located on the front panel labeled REM LBK or RLB which controls the activation of remote loopback.

Pressing REM LBK or RLBon the FNID activates

FT1 DP CPE loopback. Pressing REM LBK or RLB on the FT1 DP activates FNID network loopback or repeater loopback when a repeater is present. Remote

C. Minimum of 100 loopback enable (LBE) bytes

(N1010110).

D. Minimum of 35 all 1s bytes (S1111111), plus a minimum of 100 LBE bytes. (N-1) iterations, where

N is the number of channel units of the same type

(i.e., same LSC) that lie between the test center and the loopback to be operated. This step is only used when there are identical channel units in tandem.

loopback is deactivated by pressing the REM LBK or

RLB or waiting for the 20-minute loopback timeout, if enabled.

E. Minimum of 32 far end voice (FEV) bytes

(N1011010).

The FNID and FT1 DP (when available) have a craft interface located on the front panel of the device. The craft interface allows access to the FT1 device through an RS-232-type interface. All loopbacks for the FNID and FT1 DP can be controlled from the craft interface.

The craft interface on the FNID can activate and deactivate the FNID network loopback and the FNID

CPE loopback. The FNID craft interface can also remotely activate and deactivate the FT1 DP network loopback, FT1 DP CPE loopback, and the repeater network loopback. The craft interface on the FT1 DP can activate and deactivate the FT1 DP network loopback and the FT1 DP CPE loopback. The FT1

DP craft interface can also remotely activate and deactivate the FNID network loopback and the FNID

CPE loopback and the repeater network loopback.

A 25-second watchdog timer is activated between the

35 TIP bytes and 35 LSC bytes, between the 35 LSC bytes and 100 LBE bytes, and between the 100 LBE bytes and 32 FEV bytes. The timer requires the correct receipt of the latter sequences less than 25 seconds after receipt of the prior sequence. This prevents inadvertent setting of the latching loopbacks.

Latching loopbacks for the FT1 system are deactivated by transmitting the following latching loopback sequence in the primary DS0 of the FT1 system:

Minimum of 35 TIP bytes (N0111010).

4. LOOPUP STATE

FT1 DP, FT1 Repeater, and FNID network loopbacks can be activated by the DDS latching loopback sequence. The latching loopback sequence is detected in the primary DS0 of the FT1 system. When the loopback is activated on the device, the whole FT1 bandwidth is looped. The

FT1 DP, FT1 Repeater, and FNID each respond to a different loopback select code allowing for sectionalization of the network during testing. Table A-1 is a list of FT1 devices and their loopback select codes.

FT1 Device

In the loopup state, the active FT1 loopback will provide a continuous loop for the FT1 bandwidth.

The data flow is continuously monitored for the loop deactivation commands to deactivate the loopbacks.

Also, a 20-minute loopback timeout is checked. If the loopback timeout is enabled, any loopback that is in the loopup state for 20 minutes will be deactivated.

Table A-1. FT1 Loopback Select Codes

Loopback Select

Code Name

Loopback Select

Code Byte

FT1 DP ................................. OCU loopback .............................. N1010101

FT1 Repeater #1 ................... NEI Position 1 loopback .............. N1000001

FT1 Repeater #2 ................... NEI Position 2 loopback .............. N1000001

FNID without repeater ......... NEI Position 1 loopback .............. N1000001

FNID with one repeater ....... NEI Position 2 loopback .............. N1000001

FNID with two repeaters ..... NEI Position 3 loopback .............. N1000001

61245201L1-5C Section 61245201L1-5, Issue 3 A-3