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5

Section 61245001L7-5, Issue 1

61245.001L7-5A

4.

HDSL SYSTEM TESTING

The ADTRAN HDSL system provides the ability to
monitor the status and performance of the DSX-1 signals,
DS1 signals, and HDSL loop signals.  Detailed
performance monitoring is provided by the faceplate
mounted RS-232 Control Port or the ADTRAN HDSL
Fuse/Alarm/Control Unit (HFAC) Shelf Controller.  These
features are valuable in troubleshooting and isolating
any system level problems that may occur at installation
or during operation of the HDSL system.  The following
subsections describe additional testing features.

HTU-C DSX EQ Bantam Jacks
The front panel of HTU-C contains metallic splitting
bantam jacks for access to DSX-1 Tx and Rx from the
local loop.  This permits intrusive testing of the DSX-1
traffic on the HDSL local loop.

Figure 4 shows access provided by the DSX EQ bantam
jacks.

HTU-C

DATA

PUMP

HDSL

SPAN POWER

DSX-1

T

R

DSX-1

T1

R1

HDSL

LOOP 1

HDSL

LOOP 2

HTU-C

HDSL
LOOP 1

HDSL
LOOP 2

EQ

RX

EQ

TX

Figure 4. HTU-C Bantam Jack Arrangement

HTU-C Loopbacks
The HTU-C responds to two different loopback activation
processes.  First, loopback may be activated using the
craft interface.  The Loopback Options Screen which
provides for the HTU-C, HTU-R, and HRE loopbacks will
be described in subsection 5.

Secondly, the HTU-C responds to the industry defacto
standard for HDSL loopbacks.  A detailed description of
these loopback sequences is given in Appendix A.

The loopback condition imposed in both cases is a logic
level loopback at the point within the HTU-C where the
DSX-1 signal passes into the HDSL modulators.  Figure
5 depicts all of the loopback locations possible with
ADTRAN HDSL equipment.

When the unit is selected for framing, the addressable
loopback codes will only be detected when sent in the
appropriate framing mode.  When the unit is selected for
unframed, the addressable loopback codes will be
detected regardless of the framing mode in which they
are sent.

In addition to network-side loopbacks, the HTU-C
provides customer-side loopbacks initiated by using the
terminal control port.  In this mode, either an AIS signal
or customer data is supplied to the network.  Customer
side loopbacks must be deactivated by using the terminal.

Figure 5.  HDSL Loopbacks

DSX-1

HTU-C

LOCAL LOOP

HTU-C Network-Side Loopback

HTU-R

HTU-C

LOCAL LOOP

HTU-R Customer-Side Loopback

HTU-R

HTU-C

LOCAL LOOP

HTU-C Customer-Side Loopback

HTU-R

X

D

X

DS1

DSX-1

HTU-C

LOCAL LOOP

HTU-R Network-Side Loopback and/or
HTU-R NIU Loopback

HTU-R

X

DS1

DS1

DS1

X = Signal Inactive
D = Data Sent

X

AIS

D

AIS

HTU-C

HRE Network-Side Loopback

HTU-R

DS1

DSX-1

HRE

AIS

X

X

Summary of Contents for E220/220

Page 1: ... EN EN HTU C 1245001L7 133 0 EXT 266 399 533 CONTENTS 1 GENERAL 1 2 INSTALLATION 2 3 CONNECTIONS 4 4 HDSL SYSTEM TESTING 5 5 CONTROL PORT OPERATION 6 6 HDSL DEPLOYMENT GUIDELINES 13 7 TROUBLESHOOTING PROCEDURES 13 8 MAINTENANCE 14 9 PRODUCT SPECIFICATIONS 14 10 WARRANTY AND CUSTOMER SERVICE 14 Appendix A HDSL LOOPBACKS A 1 FIGURES Figure 1 ADTRAN HTU C 1 Figure 2 HTU C Edge Connector Wiring 4 Figu...

Page 2: ...or possible shipping damage Ifdamageisdiscovered fileaclaimimmediately withthecarrier thencontactADTRANCustomerService see subsection 10 The E220 220 Low Voltage HTU C plugs directly into standard 220 office repeater shelves These include Kentrox T Term 220 Wescom 34220 and 34230 Lynch 303MA30 as well as the ADTRAN E220 Shelf and the ADTRANE220RPShelf Noinstallationwiringisrequired One six positio...

Page 3: ...ree possible loopback states Off Unit is not in loopback or armed state Blinking The loopback arming sequence has been detected In this state the unit is armed ready for loopback but not in loopback On Solid Local HTU C loopback is active Table C Front Panel Indicators Indicator LP1 LP2 DSX ALM LBK Table B SW1 Option Settings 1 Default settings are indicated in bold typeface Function Loopback Time...

Page 4: ... Input to HTU C Output from HTU C Input to HTU C Output from HTU C The HTU C is capable of span powering the HTU R by applying simplex current to the local loop 30 to 155 mA of current is coupled onto the HDSL span to power the HTU R and HRE when deployed The span powering voltage is less than 140 volts with Loop 1 providing the negative voltage and Loop 2 the return see Figure 3 2B1Q HDSL SPAN PO...

Page 5: ... HTU C HTU R and HRE loopbacks will be described in subsection 5 Secondly the HTU C responds to the industry defacto standard for HDSL loopbacks A detailed description of these loopback sequences is given in Appendix A The loopback condition imposed in both cases is a logic level loopback at the point within the HTU C where the DSX 1 signal passes into the HDSL modulators Figure 5 depicts all of t...

Page 6: ...gy The circuit includes an HTU C Figure 6 RS 232 DB9 Pin Assignments Table D Screen Abbreviations Abbreviation ES SES UAS SF ESF B8ZS AMI LBO BPV NIU S N 15M 24H Definition Errored Seconds DSX DS1 SF Second in which a BPV or frame bit error occurs ESF Second in which a BPV or CRC error occurs HDSL Second in which a CRC error occurs Severely errored seconds DSX DS1 SF Second in which 1544 BPVs or 8...

Page 7: ...ion loss measured at 200 kHz The LOSS measurement is a better indication of the loop s attenuation of the 2B1Q signal than the insertion loss measured at a single frequency Adtran HDSL can operate on cables with an excess of 30 dB LOSS SYNC HDSL Loop 1 and Loop 2 Sync Status ES 15M 24H Errored Seconds SES 15M 24H Severely Errored Seconds UAS 15M 24H Unavailable Seconds The first number is for the ...

Page 8: ...n Menu Screen ADTRAN HDSL 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 7 Introductory Menu Screen ADTRAN 901 Explorer Boulevard Huntsville Alabama 35806 2807 For Information or Technical Support Normal Support Hours 7am 7pm CST or Eme...

Page 9: ...X 1 X 00000 UAS 00000 X 1 X X 0 X NONE ALARMS NONE X 0 X SEALING CURRENT PRESENT Press Z to zero registers M for Main Menu H for HDSL Range Extender 1 HRE View Figure 9A Current System Status Screen HRE HRE 1 CURRENT SYSTEM STATUS HRE 1 LOOP 1 NETWORK LOOP 2 ELAPSED TIME 00 00 03 LOOP 1 CUSTOMER LOOP 2 01 dB 01 dB LOSS 01 dB 01 dB YES YES SYNC YES YES 000 00000 000 00000 ES 15M 24H 000 00000 000 0...

Page 10: ...C 5 1 6 R 2 14 000 000 30 000 000 15 000 000 31 000 000 16 000 000 32 000 000 Press view number to select view M to return to Main Menu Press H to view HRE 1 history PERFORMANCE HISTORY VIEW 1 HRE NETWORK LP1 RECEIVER 24 HOUR REGISTERS 15 MINUTE REGISTERS ES SES ES SES ES SES 00000 00000 CURRENT 000 000 1 1 000 000 17 000 000 2 2 000 000 18 000 000 3 3 000 000 19 000 000 4 4 000 000 20 000 000 5 P...

Page 11: ...WORK AT HTU C INACTIVE 2 LOOPBACK TO CUSTOMER AT HTU C INACTIVE 3 LOOPBACK TO NETWORK AT HTU R INACTIVE 4 LOOPBACK TO CUSTOMER AT HTU R INACTIVE 5 LOOPBACK TO NETWORK AT HRE1 INACTIVE Press corresponding number to toggle loopback option Press M for Main Menu Figure 12 Self Test Options Screen SELF TEST Press S to initiate HTU C and HTU R self tests _ _ _ _ _ Press M to return to the Main Menu ...

Page 12: ...NGS HARDWARE SETTINGS 1 DSX 1 LINE BUILDOUT 0 133 FEET 0 133 FEET 2 DSX 1 DS1 LINE CODE B8ZS B8ZS 3 DSX 1 DS1 FRAMING ESF ESF 4 NIU LOOPBACK ENABLED ENABLED 5 LOOPBACK TIMEOUT 20 MIN 20 MIN 6 DS1 TX LEVEL 0 dB 7 DS0 BLOCKING 00000000 00000000 00000000 CHANNELS 1 24 X INDICATES A BLOCKED CHANNEL ________________________________________________ ______________________ Press n to change corresponding ...

Page 13: ... ___________________________________________ 26 PIC 3 902 4 051 4 253 26 Pulp 4 030 4 179 4 381 24 PIC 2 863 2 957 3 083 24 Pulp 3 159 3 257 3 391 22 PIC 2 198 2 255 2 333 22 Pulp 2 483 2 45 2 629 19 PIC 1 551 1 587 1 634 19 Pulp 1 817 1 856 1 909 ___________________________________________ Recommended maximum local loop loss information for PICcableat70 F 135Ω resistiveterminationisprovided in Ta...

Page 14: ...ommendthatrepairsbeperformed in the field Repair services may be obtained by returning the defective unit to the ADTRAN Customer Service RMA Department 9 PRODUCT SPECIFICATIONS Product specifications are detailed in Table H 10 WARRANTY AND CUSTOMER SERVICE ADTRAN will replace or repair this product within ten years from the date of shipment if it does not meet its published specifications or fails...

Page 15: ... the ADTRAN Low Voltage HRE P N 1244 042L1 and the ADTRAN Low Voltage HTU R 1245 021L1 Total Power 48 VDC 180 mA with HTU R 48 VDC 370 mA with HTU R and HRE HTU C Power Dissipation 5 watts with HTU R 6 watts with HRE and HTU R Span Power 140 VDC Internally Generated current limited at 150 mA Fusing 1 00 A BUSS GMT 1 00 or equivalent not field replaceable Clock Clock Sources Internal DSX 1 Derived ...

Page 16: ...ed as a Different Tandem Dataport For a complete description of the DDS Latching Loopback codes refer to Bellcore TA TSY 000077 Issue 3 Section 5 1 3 Loopback Control Codes AsummaryofcontrolsequencesisgiveninTablesA 1 and A 2 In all control code sequences presented the in band codes are shown left most bit transmitted first and the ESF data link codes with right most bit transmitted first Table A ...

Page 17: ... be injected every 20seconds Whenthepatternisremoved theunitwillremainin loopback If the pattern is reinstated the injection of 10 bit errors will resume at 20 second intervals Any HTU C and HRE units currently in loopback towards the network will loopdown and will not attain the armed state IftheunitsarearmedandtheHTU C HRE orHTU Rareinnetwork loopback errors are injected into the DSX 1 signal up...

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