ADTRAN Network Card FNID User Manual

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  
FNID  
1245201L1  
DSL  
DS1  
ESF  
SF  
(YEL)  
(GRN)  
B8ZS  
AMI  
(YEL)  
(GRN)  
LBK  
LOC  
L
B
K
Appendix A. FT1 Loopbacks ................................................... A-1  
REM  
TX  
M
O
N
FIGURES  
RX  
Figure 1.  
Figure 2.  
Figure 3.  
Figure 4.  
Figure 5.  
Figure 6.  
Figure 7.  
Figure 8.  
Figure 9.  
ADTRAN FNID ...................................................... 1  
FNID Option Switch Locations .............................. 2  
FNID Network Loop Connection Locations .......... 4  
RS-232 (DB9) Pin Assignments ............................. 4  
Introductory Menu Screen ...................................... 7  
HDSL Main Menu Screen ...................................... 7  
Current System Status Screen................................. 8  
Performance History Screen ................................... 8  
Loopback Options Screen ....................................... 9  
2
3
2
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 1. ADTRAN FNID  
1. General  
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  
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.  
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  
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.  
Table A-1. FT1 Loopback Select Codes ................................ A-3  
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  
Trademarks: Any brand names and product names included in this document are  
trademarks, registered trademarks, or trade names of their respective holders.  
1
 
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 .................  
RS-232 .............  
This LED indicates two possible loopback states as described below.  
Off ........................ Unit is not in loopback  
On Solid ............... Local (FNID) loopback is active  
DB9 connector for craft interface. Allows connection to controlling terminal. For further information, refer to  
subsection 6 of this practice.  
REM LBK .......  
LOL LBK ........  
Remote Loopback. Push button to toggle Loopback active/inactive.  
Local Loopback. Push button to toggle Local Loopback active/inactive.  
3. CONNECTIONS  
Table B. FNID Card Edge Pin Definitions  
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).  
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  
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:  
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  
• 61242007L1-5, HR12 I/M  
• 61242008L1-5, HR4 I/M  
• 61242034L2-5, T400 Single Mount I/M  
(removable RJ-48 jacks)  
49 ............... DS1-R .............. DS1 Transmit In ring  
(from Customer Interface)  
55 ............... DS1-T .............. DS1 Transmit In tip  
(from Customer Interface)  
NOTE: Ensure chassis ground is  
properly connected for either  
standalone or shelf-mounted  
applications.  
61245201L1-5C  
Section 61245201L1-5, Issue 3  
3
 
4. DSL SYSTEM TESTING  
5. CONTROL PORT OPERATION  
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.  
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.  
1
6
DS1 MON Bantam Jack  
2
3
4
5
TXD (Transmit Data)  
RXD (Receive Data)  
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.  
7
8
9
SGN (Signal Ground)  
NOTE: MON Rx provides access to  
the DS1 input from the customer’s  
equipment. MON Txprovidesaccess  
totheDS1outputoftheFNIDtoward  
the customer.  
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.  
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.  
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.  
T1 TO CPE  
DS1  
Operation  
R1 TO CPE  
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.  
T FROM CPE  
DS1  
R FROM CPE  
T1 LOOP1  
R1 LOOP1  
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.  
GND  
-48V  
Figure 3. FNID Network Loop Connection  
Locations  
4
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.  
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.  
1. Current System Status  
2. Performance History  
3. ADTRAN Information  
4. Loopback Options  
5. Self Test  
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  
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.  
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  
Margin is 9 dB (excellent quality) above 10-7 BER  
9
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  
Voice: 256.963.8100  
Fax: 256.963.6217  
—————————————————————————————--------------------------------------——————————-  
FT1-DP INFORMATION  
————----------——————  
S/N :  
SIGNAL QUALITY  
FNID INFORMATION  
—————----------—————  
S/N : DATA NOT AVAIL  
CLEI:  
SIGNAL QUALITY  
[ ]  
[ ]  
[ ]  
[ ]  
[ ]  
[ ]  
[ ]  
[ ]  
[ ]  
[ ]  
9
8
7
6
5
4
3
2
1
0
[ ]  
[ ]  
[ ]  
[ ]  
[ ]  
[ ]  
[ ]  
[ ]  
[ ]  
[ ]  
9
8
7
6
5
4
3
2
1
0
CLEI:  
MANF:  
/
MANF:  
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.  
Figure 6. HDSL Main Menu Screen  
61245201L1-5C  
Section 61245201L1-5, Issue 3  
7
 
FT1-DP  
NETWORK (DSL)  
----------------------  
00 dB  
CURRENT SYSTEM STATUS  
ELAPSED TIME 00:08:18  
FNID  
CUSTOMER (DSL)  
-----------------  
00 dB  
<-  
LOSS  
SYNC  
->  
->  
NO  
<-  
NO  
000/00000  
000/00000  
498/00498  
<- ES  
<- SES 15M/24H ->  
<- UAS 15M/24H ->  
15M/24H ->  
000/00000  
000/00000  
498/00498  
LOOPBACKS INACTIVE  
LOOPBACKS INACTIVE  
FT1-DP SIGNAL QUALITY  
FNID DS1  
--------------------  
FNID SIGNAL QUALITY  
[ ]  
[ ]  
[ ]  
[ ]  
[ ]  
[ ]  
[ ]  
[ ]  
[ ]  
[ ]  
9
8
7
6
5
4
3
2
1
0
[ ]  
[ ]  
[ ]  
[ ]  
[ ]  
[ ]  
[ ]  
[ ]  
[ ]  
[ ]  
9
8
7
6
5
4
3
2
1
0
FRAME  
CODE  
LBO  
BPV  
ES  
SES  
UAS  
——>  
——>  
——>  
——> 00000  
——> 00000  
——> 00000  
——> 00000  
SF  
AMI  
0 dB  
ALARMS ——>  
NO SEALING CURRENT  
NONE  
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  
—-ES-----SES--  
00000 00000  
15 MINUTE REGISTERS  
—ES-SES-----ES-SES-  
000 000  
<-- CURRENT -->  
-1: ----- -----  
-2: ----- -----  
-3: ----- -----  
-4: ----- -----  
-5: ----- -----  
-6: ----- -----  
-7: ----- -----  
<--  
|
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-->  
|
|
-1: --- ---  
-17: --- ---  
-18: --- ---  
-19: --- ---  
-20: --- ---  
-21: --- ---  
-22: --- ---  
-23: --- ---  
-24: --- ---  
-25: --- ---  
-26: --- ---  
-27: --- ---  
-28: --- ---  
-29: --- ---  
-30: --- ---  
-31: --- ---  
-32: --- ---  
-2: --- ---  
-3: --- ---  
-4: --- ---  
-5: --- ---  
-6: --- ---  
-7: --- ---  
-8: --- ---  
-9: --- ---  
-10: --- ---  
-11: --- ---  
-12: --- ---  
-13: --- ---  
-14: --- ---  
-15: --- ---  
|
|
|PREVIOUS |  
|
<--  
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VIEW LOCATION DIAGRAM  
-->|F|  
|T|  
|F|-->  
|N|  
|1|<--3-----DSL-----4-->|I|  
|D|  
<--|P|  
|D|  
| |<--2  
--> -16: --- ---  
Press view number to select view, “M” to return to Main Menu  
Figure 8. Performance History Screen  
8
Section 61245201L1-5, Issue 3  
61245201L1-5C  
 
LOOPBACK OPTIONS  
FT1-DP  
_____  
FNID  
_____  
|
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—-->|  
|<—-  
|
|
NET |  
|<===========================>|  
| CUST  
|
|—>  
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<—--|  
|
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|_____|  
|_____|  
1) LOOPBACK TO NETWORK AT FT1-DP =INACTIVE  
2) LOOPBACK TO CUSTOMER AT FT1-DP =INACTIVE  
3) LOOPBACK TO NETWORK AT FNID  
4) LOOPBACK TO CUSTOMER AT FNID  
=INACTIVE  
=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.  
Figure 10. Self-Test Options Screen  
61245201L1-5C  
Section 61245201L1-5, Issue 3  
9
 
PROVISIONING  
___________________________________________________ ______________________  
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PROVISIONS  
CURRENT SETTINGS  
|
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HARDWARE SETTINGS |  
----------------- |  
------------------------------------------  
1. DS1 (FNID) LINE CODE =  
2. DS1 (FNID) FRAMING  
3. DS1 (FNID) TX LEVEL =  
B8ZS  
ESF  
0 dB  
B8ZS  
ESF  
|
|
|
|
|
|
|
=
4. LOOPBACK TIMEOUT  
5. LATCHING LOOPBACK  
6. DSO SEQUENCE  
=
=
=
=
20 MIN  
20 MIN  
ENABLED  
ALTERNATING  
12 (768Kbps)  
ENABLED  
ALTERNATING  
12 (768Kbps)  
7. NUMBER OF DSOS  
|___________________________________________________|______________________|  
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  
_____  
|
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—-->|  
|<—--  
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NET |  
|<===========================>|  
| CUST  
|
|--—>  
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<---|  
|
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|_____|  
|_____|  
ALARMS:  
FT1-DP RED  
FT1-DP RED  
PROBLEM INDICATED:  
CHANNEL BANK ALARM  
DSL  
LOSS  
Press “M” for Main Menu.  
Figure 12. Troubleshooting Screen  
10  
Section 61245201L1-5, Issue 3  
61245201L1-5C  
 
6. DSL DEPLOYMENT GUIDELINES  
Recommended maximum local loop loss information  
for PIC cable at 70°F, 135, resistive termination is  
provided in Table D.  
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.  
Table D. Loop Insertion Loss Data  
Frequency (Hz)  
Maximum Loss (dB)  
1. All loops are non-loaded only.  
3,000 .......................... 12.0  
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.  
10,000 .......................... 15.0  
50,000 .......................... 25.5  
100,000 .......................... 30.0  
150,000 .......................... 32.75  
200,000 .......................... 35.25  
6. The total length of multi-gauge cable containing  
26-AWG cable must not exceed  
An approximation for the maximum amount of  
wideband noise on a DSL local loop as measured by a  
50 kbps filter is 31 dBrn.  
12 - {(3*L26)/9} - LBTAP (in kft)  
L26  
=
=
Total length of 26-AWG cable  
excluding bridged taps (in kft)  
An approximation for the maximum level of impulse  
noise as measured using a 50 kbps filter on an DSL  
loop is 50 dBrn.  
LBTAP  
Total length of all bridged taps (in kft)  
This deployment criteria is summarized in the chart  
shown in Figure 13.  
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.  
12  
11  
INVALID DSL CABLE LENGTHS  
10  
TOTAL  
9
BRIDGED  
2.5  
TAP  
2.0  
8
7
6
5
4
3
2
1
0
1.5  
LENGTH  
(KFT)  
1.0  
0.5  
0.0  
VALID DSL CABLE LENGTHS  
0
1
2
3
4
5
6
7
8
9
WORKING LENGTH OF 26 GAUGE CABLE (KFT)  
Figure 13. DSL Deployment Guidelines  
61245201L1-5C  
Section 61245201L1-5, Issue 3  
11  
 
7. TROUBLESHOOTING PROCEDURES  
Table E is a troubleshooting guide for the FNID.  
Return Material Authorization (RMA) is required  
prior to returning equipment to ADTRAN. ADTRAN  
does not recommend that repairs be performed in the  
field.  
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.  
For service, RMA requests, or further information,  
contact one of the following numbers:  
ADTRAN Customer Service:  
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.  
ADTRAN Telco Technical Support. (800) 726-8663  
Standard support hours ..................... Monday-Friday  
7 a.m. - 7 p.m. CST  
9. PRODUCT SPECIFICATIONS  
Specifications for the FNID are provided in Table F.  
Emergency support......... 7 days/week, 24 hours/day  
Sales.................................................. (800) 827-0807  
RMA (repair service) ....................... (256) 963-8722  
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.  
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 1. Verify that the loop conforms with CSA guidelines (not too long, etc.).  
loop sync (DSL LED is off.)  
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  
back to the network. The FT1 DP CPE loopback  
loops the FT1 signal back to the customer.  
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.  
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.  
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:  
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.  
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  
DSX-1  
Interface  
FT1  
Repeater  
FNID  
FT1 DP  
Customer  
T1 NIU  
Premises  
Equipment  
Central Office  
A
B
C
D
E
D4  
Channel Bank  
Figure A-1. FT1 Loopbacks  
HDSL  
DS1  
Interface  
DSX-1  
Interface  
FT1  
Repeater  
FT1 DP  
FNID  
Customer Premises  
Central Office  
D4  
Channel Bank  
Local Loop  
Figure A-2. FT1 DP Network Loopback  
DS1  
Interface  
DSX-1  
Interface  
FT1 DP  
FNID  
HDSL  
Local Loop  
Customer Premises  
Central Office  
D4  
Channel Bank  
Figure A-3. FT1 DP CPE Loopback  
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.  
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.  
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 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.  
The FNID network loopback is a digital loopback  
toward the CO as illustrated in Figure A-5. This  
DSX-1  
DS1  
FT1 DP  
FNID  
Interface  
Interface  
HDSL  
Local Loop  
Central Office  
Customer Premises  
D4  
Channel Bank  
Figure A-4. FT1 Repeater # 1 or 2 Network Loopback  
DS1  
Interface  
DSX-1  
Interface  
FNID  
FT1 DP  
HDSL  
Local Loop  
Central Office  
Customer Premises  
D4  
Channel Bank  
Figure A-5. FNID Network Loopback  
DS1  
Interface  
DSX-1  
Interface  
FNID  
FT1 DP  
HDSL  
Local Loop  
Central Office  
Customer Premises  
D4  
Channel Bank  
Figure A-6. FNID CPE Loopback  
A-2  
Section 61245201L1-5, Issue 3  
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.  
C. Minimum of 100 loopback enable (LBE) bytes  
(N1010110).  
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  
loopback is deactivated by pressing the REM LBK or  
RLB or waiting for the 20-minute loopback timeout, if  
enabled.  
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.  
E. Minimum of 32 far end voice (FEV) bytes  
(N1011010).  
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.  
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.  
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  
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.  
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  
Table A-1. FT1 Loopback Select Codes  
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  
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  
 

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