Instruction/ maintenance manual of the product ETU-751C ADC
Go to page of 82
WorldDSL U SER M ANUAL H D S L WorldDSL G.703 S Y N C A L M H D S L I/F L O C L P B K V. 2 4 R E M A L M SYNC ALM ALM HDSL I/F LPBK LOC REM R ATE S ELECTABLE HDSL L INE AND D ESKT OP U NI TS UTU-701C .
700-701-10 0-02 ii August 9, 2002 ETU-701C and E TU-751C Li st 1 Revision History of This Manual To order co pies of t his ma nual, use document n umber 700-7 01-100 -02.
700-701-10 0-02 Using This Manual ETU-701 C and ETU- 751C List 1 August 9, 2002 iii U SING T HIS M ANUAL The following conven tions are used in this man ual: • Monospace type indicates screen text. • Keys you press ar e indicated by small icons such as or .
Inspecting Sh ipmen t 700-701-10 0-02 iv August 9, 2002 ETU-701C and E TU-751C Li st 1.
700- 701 -100 -02 Tabl e of Conte nts ETU-701 C an d ETU-751 C List 1 A ugust 9, 2 002 v T ABLE OF C ONTENTS Overview _ ______ _____ _________ _____ ______ ______ ________ ______ _____ ______ _________ ____ 1 Rate Selectable HDSL Unit Firmware .......
Table of Conte nts 700-701-10 0-02 vi August 9, 2002 ETU-701C and ETU-75 1C List 1 System Configu ration ____ _____ _________ _____ ______ ______ ________ ______ _____ _________ __ 25 Maintenance Terminal Co nnection ........ ........... ........... .
700-701-10 0-02 List of Figu res ETU-701 C an d ETU-751 C List 1 A ugust 9, 2 002 vii L IST OF F IGURES 1. Leased Line Data App lication on a Single-pair G.70 3 Network ........................ ........... ........... ................. ... .. 3 2. UTU-701C Line Unit Front Panel .
List of Figures 700-701-10 0-02 viii August 9, 2002 ETU-701C and ETU-75 1C List 1 37. LTU Interfa ce Alarm History Screen .................. ........... ........... ............ ................. ........... .......... . ........... ..... 54 38. History HDSL Span 1 Menu .
700-701-10 0-02 List of Tables ETU-701 C and ETU- 751C List 1 August 9, 2002 ix L IST OF T ABLES 1. Rate Selectable G.703 Unit Characteristics ................ ................. ............ ........... ........... ................ . ........... .....
List of Tables 700-701-10 0-02 x August 9, 2002 ETU-701C and E TU-751C Li st 1 37. ECA-80 1 DB25M to DB15 F (X.21) Co nnector Adap ter Pinouts.................... ........... ................. ........... ..... 66 38. ECA-80 2 DB9M to RJ-45 Connector Adapter Pinouts .
700-70 1-100-02 Over view UTU-701 and ETU-751 List 1 August 9, 2002 1 O VERVIEW ADC ® Wor ldDSL ™ offers High-bit-rate Digital S ubscriber Line (HDSL) Line Termination Units (LTUs), Network Termination Units (NTUs), Uni versal Termination Units (UTUs), and ETSI Termination Units (ETUs).
Overview 700-701-10 0-02 2 August 9, 2002 UTU-701 and ETU-751 List 1 EMU F IRMWARE C OMPATIBILITY The EMU-830 Management Unit firmware must be V ersion 3.22.08 or later to support rate selectab le HDSL units. A PPLICATION I NTERFACE The UTU-701C and ETU-751C provide G.
700-70 1-100-02 Over view UTU-701 and ETU-751 List 1 August 9, 2002 3 Figur e 1. Leased L ine Data Appl icatio n on a Single- pair G.70 3 Networ k HDSL T ECHNOLOGY HDSL is the core technology for ADC’s WorldDSL lin e of LTUs, UTUs, and ETUs.
Overview 700-701-10 0-02 4 August 9, 2002 UTU-701 and ETU-751 List 1 F RONT AND R EAR P ANEL C OMPONENTS The line and deskt op unit front pane ls are sho wn in Figure 2 and Figure 3 , respectively. Th e components on these panels are des cribed i n Tabl e 3 on page 5 and in Tabl e 4 on p age 6 .
700-70 1-100-02 Over view UTU-701 and ETU-751 List 1 August 9, 2002 5 Table 3. Lin e and Desktop Unit Front Panel Components Name Functi on HDSL SYNC LED Displays synchron izatio n state for t he HDSL lo op. HDSL ALM LE D Displays alarm state for th e HDSL loop.
Overview 700-701-10 0-02 6 August 9, 2002 UTU-701 and ETU-751 List 1 Table 4 defines the s ystem states indicated by the front p ane l LEDs. When power is applied to th e unit, one of the LEDs listed in Table 4 will always be on.
700-70 1-100-02 Over view UTU-701 and ETU-751 List 1 August 9, 2002 7 Figure 4. ETU-751C Desktop Unit Rear Pa nel Table 5. ETU-751C Desktop Unit Rear -Panel Co mponents Item Descriptio n D15F 1 20 Ω G.703 connect or Conne cts E1 bal anced 120 Ω ci rcuits to the en closure.
Overview 700-701-10 0-02 8 August 9, 2002 UTU-701 and ETU-751 List 1 W ORLD DSL P RODUCT C OMPATIBILITY The line and deskto p units are compatible with the W orldDSL products listed in Table 6 .
700-701 -100-02 Spec ificatio ns UTU-701 and ETU-751 List 1 August 9, 2002 9 S PECIF ICAT IONS HDSL Interface Line C ode 2B1 Q Line Rate (s electable in incremen ts of 64 kbps) Up t o 2048 kbps Prote ctio n K.
Specificat ions 700-701-10 0-02 10 August 9, 2002 UTU-701 and ETU-751 List 1 Alarms Can be individually set to Disab led, Minor, or Majo r (major alarms actu ate the LTU or NTU alarm relay) E1 Interfa.
700-701-10 0-02 Funct ional Descript ion UTU-701 and ETU-751 List 1 August 9, 2002 11 F UNCTIONA L D ESCR IPTION This section provides a functio nal description of the li ne and desktop units, includin g major components, single-pair application m ode, alarms, and testing (including mon itoring and loopbacks).
Functiona l Descripti on 700-701-10 0-02 12 August 9, 2002 UTU-701 and ETU-751 List 1 G.703 Int erface The G.703 interf ace performs th e following function s: • provides a jumper-s electable 75 or .
700-701-10 0-02 Funct ional Descript ion UTU-701 and ETU-751 List 1 August 9, 2002 13 Powe r Sou rce s The line and deskto p units receive po wer from the following sourc es: • A shelf-mounted UTU-7 01C receives power f rom a local s ource of -36 Vdc to -72 Vdc.
Functiona l Descripti on 700-701-10 0-02 14 August 9, 2002 UTU-701 and ETU-751 List 1 R ATE S ELECTABLE A PPLICATION M ODES AND O PTIONS Applications for single-pair rate-selectable HDSL are thos e th at requ ire transport of v oice and data at var ious rates over variou s distances on a single pair of wires.
700-701-10 0-02 Funct ional Descript ion UTU-701 and ETU-751 List 1 August 9, 2002 15 For applications requirin g fractional use of the G.70 3 port, embe dd ed ge nerat ion and de tect ion of CRC -4 information, and A-bit insertion, select les s than 32 time slots to invoke the structured mode.
Functiona l Descripti on 700-701-10 0-02 16 August 9, 2002 UTU-701 and ETU-751 List 1 Unstructured Mode When 32 time slots are selected, the line and des ktop units automatically op erate in the unstructured mode (see “G.704 Framing an d Rate Selectable HDSL” on page 1 7 ).
700-701-10 0-02 Funct ional Descript ion UTU-701 and ETU-751 List 1 August 9, 2002 17 G.704 Fra ming and Rate Sele ctable HDSL Time slots 0 and 16 are always transpor ted in accordance with the G.
Functiona l Descripti on 700-701-10 0-02 18 August 9, 2002 UTU-701 and ETU-751 List 1 P ERFORMANCE M ONIT OR ING AND H ISTORY The UTU and ETU un its provide extensive real time, non-disruptive mon itoring of HDSL transmiss ion performance parameters for all units in a circuit.
700-701-10 0-02 Funct ional Descript ion UTU-701 and ETU-751 List 1 August 9, 2002 19 L OOPBACKS An HDSL system ma intains several di agnostic loopback configur ations, both toward and away from the lo cal unit, which can be used to verify proper transmission of test data through the lo cal unit, the HDSL facility, and the remote unit.
Functiona l Descripti on 700-701-10 0-02 20 August 9, 2002 UTU-701 and ETU-751 List 1 The following applies to LTU and NTU loopbacks: • No inband loo pback codes ar e recognized or g enerated.
700-701-10 0-02 Funct ional Descript ion UTU-701 and ETU-751 List 1 August 9, 2002 21 Table 13 summarizes the equivalent loopb acks for two differen t activation methods : • LTU and NTU LOC and REM .
Inspecti on, Safety , and Equipm ent Repa ir 700-701-10 0-02 22 August 9, 2002 UTU-701 and ETU-751 List 1 I NSPEC TION , S AFETY , AND E QUIP MENT R EPAIR This section describes the procedur es to be followed regarding product ins pection, safety, and repair.
700-701-10 0-02 Installation an d Startup UTU-701 and ETU-751 List 1 August 9, 2002 23 I NSTA LLA TION AND S TARTUP This section describes th e installation and st artup procedures for the line and de sktop units. UTU-701C L INE U NIT I NSTALLATION Perform the following step s to install t he UTU-701C line unit.
Installation and Startup 700-701-10 0-02 24 August 9, 2002 UTU-701 and ETU-751 List 1 ETU-751C D ESKTOP U NIT I NSTALLATION Perform the following step s to install an ETU-751C deskt op unit. 1 Insert the AC power cord into th e powe r cord recep tacle on the ETU rear pan el.
700-701-10 0-02 System Config uration UTU-701 and ETU-751 List 1 August 9, 2002 25 S YSTEM C ONFIGURATION Each line unit provides a system-wide view of th e en tire HDSL circuit, including the remote unit.
System C onfiguration 70 0-701-10 0-02 26 August 9, 2002 UTU-701 and ETU-751 List 1 To connect and con figure a maintenance term inal: 1 Connect a serial cable from the maintenance terminal 9- pin COM por t to the li ne or de sktop un it con sole port connector ( Fi gure 11 ).
700-701-10 0-02 System Config uration UTU-701 and ETU-751 List 1 August 9, 2002 27 L OGGING O N To log on to the maintenance terminal console screen: 1 Press the several times to di splay the Logon Password screen ( Figure 1 2 ).
System C onfiguration 70 0-701-10 0-02 28 August 9, 2002 UTU-701 and ETU-751 List 1 C ONSOLE S CREEN S TRUCTURE The following s ections describe the structure of the co nsole scr een and ho w to na vigate thr ough its menus and related display s. The structure of the console screen displays and dr op-down menus is shown in Figure 14 .
700-701-10 0-02 System Config uration UTU-701 and ETU-751 List 1 August 9, 2002 29 Table 14 desc ribes the drop-do wn menus selected from the console s creen.
System C onfiguration 70 0-701-10 0-02 30 August 9, 2002 UTU-701 and ETU-751 List 1 R EADING AND N AVIGATING M ENUS The menu and s tatus bars app ear on all console s creens. Th e infor mation on the rest of th e screen varies dep ending on the funct ion of t he menu or sc reen.
700-701-10 0-02 System Config uration UTU-701 and ETU-751 List 1 August 9, 2002 31 Use the keys described in Table 16 to navigate the co nsole screen and its menus: Table 16.
System C onfiguration 70 0-701-10 0-02 32 August 9, 2002 UTU-701 and ETU-751 List 1 Config Menu Options Type at the console screen ( Figure 15 ) to display the Config menu ( Figu re 16 ). Table 1 7 lists the Config menu options and the o rder of sy stem confi gurati on.
700-701-10 0-02 System Config uration UTU-701 and ETU-751 List 1 August 9, 2002 33 Configure Terminal Settings 1 Type at the Config dro p-dow n me nu to displ ay t he Co nfig Terminal Settings menu ( Figure 17 ).
System C onfiguration 70 0-701-10 0-02 34 August 9, 2002 UTU-701 and ETU-751 List 1 Configure Date and Time 1 Type at the Config drop-down menu to dis play the Config Date and Time menu ( Figure 1 8 ). Figure 18. C onfi g Date and Tim e Menu 2 Type the date in DD/MM/YY format, then press .
700-701-10 0-02 System Config uration UTU-701 and ETU-751 List 1 August 9, 2002 35 Change Password 1 Type at the Config dro p-dow n me nu to displ ay t he Config Chang e Pass word menu ( Figure 19 ). Figure 19. Con fig Ch ange P asswo rd Men u 2 Enter a new pas sword (up to eight ch aracters) to chang e the current syst em password.
System C onfiguration 70 0-701-10 0-02 36 August 9, 2002 UTU-701 and ETU-751 List 1 Configure Circuit ID The circuit ID appears on the status line of each consol e screen. Choose a unique circuit ID for each HDSL card. 1 Type at the Config dro p-dow n me nu to displ ay t he Config Cir cuit ID menu ( F igur e 20 ).
700-701-10 0-02 System Config uration UTU-701 and ETU-751 List 1 August 9, 2002 37 Configure System Settings Use the Syste m Set tin gs menu to sele ct and configure s ystem-wide oper ating parameters. C onfigure sy stem settings as follo ws: 1 Type at the Config dr op-down menu to dis play the Config System Settings menu.
System C onfiguration 70 0-701-10 0-02 38 August 9, 2002 UTU-701 and ETU-751 List 1 Table 18 . Fields and Option s Displayed in Config Sys tem Settings Menu Fiel d and Opt ions Description Applic atio n Mode (a) SINGLE System uses a si ngle-pair of twisted copper wire to tr ansport da ta.
700-701-10 0-02 System Config uration UTU-701 and ETU-751 List 1 August 9, 2002 39 Configure LTU a nd NTU Interfaces Select and configure the LTU- and NTU-related operating par ameters as follows: 1 T.
System C onfiguration 70 0-701-10 0-02 40 August 9, 2002 UTU-701 and ETU-751 List 1 2 Do the following for each in terface option to be changed. Table 19 describe s the fiel ds and op tions di splayed in the C onfig LTU and Config NT U Inte rface menus.
700-701-10 0-02 System Config uration UTU-701 and ETU-751 List 1 August 9, 2002 41 Configure Alarms Use the Config Alarm s menu to conf igure LTU and NTU Inter face alarm parame ters and the HDSL span alarm parameters.
System C onfiguration 70 0-701-10 0-02 42 August 9, 2002 UTU-701 and ETU-751 List 1 Alarms for LTU and NTU Interface 1 Type one of the fol lowing at the Conf ig Alarms drop-dow n menu to displa y the .
700-701-10 0-02 System Config uration UTU-701 and ETU-751 List 1 August 9, 2002 43 HDSL Span 1 Alarms 1 Type at the Conf ig Alarms drop-d own menu to dis play the Config Alarms HDSL Span 1 men u ( Figur e 27 ). Figu re 27. Config Alarms HDSL Spa n 1 Men u 2 Do the follo wing for each interfa ce option to b e changed.
System C onfiguration 70 0-701-10 0-02 44 August 9, 2002 UTU-701 and ETU-751 List 1 S ET TO F ACTORY D EFAULTS Set to Factory Dflts is the screen from which all operating options can be reset to the ADC factory def aults. 1 Type at the Config dr op-down menu to displ ay the Set to Factory Dflts screen ( Figure 28 ).
700-701-10 0-02 System Config uration UTU-701 and ETU-751 List 1 August 9, 2002 45 3 Do one of the following: • Type to keep the current settings. • Type to reset values to factory defaults. The system resets and both LTU and NTU units go through their respective synchronization processes.
Viewi ng Status 700-701-10 0-02 46 August 9, 2002 UTU-701 and ETU-751 List 1 V IEWIN G S TA TUS The following s ections describe the s creens that display status and system info rmation, such as current alarm status, perf ormance h istory, produ ct, and con figuration inform ation.
700-701-10 0-02 Viewi ng Status UTU-701 and ETU-751 List 1 August 9, 2002 47 Table 24 describ es th e fi elds di spl ayed on th e Main console screen. Table 24. Fields Displayed in Main Cons ole Screen Field Descrip tion Circ uit Co nfigu ration G.703 Indicates the interf ace st andard fo r G.
Viewi ng Status 700-701-10 0-02 48 August 9, 2002 UTU-701 and ETU-751 List 1 M ONITOR M ENU The Monitor men u contains the following o ptions: • LTU Interface scr een that displays the 24 hour an d cumulative count o f errors at the LTU G.703 port. • NTU Interface screen that d isplays the 24 hou r and cumulative count o f errors at the NTU G.
700-701-10 0-02 Viewi ng Status UTU-701 and ETU-751 List 1 August 9, 2002 49 Monitor LTU In terfac e Scre en At the Monitor menu ( Fig ure 30 ), type to di splay the Monitor LTU I nterface screen ( Figur e 31 ). Table 25 describes the fields display ed in the M onitor LTU and M onitor NTU Interf ace scr eens.
Viewi ng Status 700-701-10 0-02 50 August 9, 2002 UTU-701 and ETU-751 List 1 Monitor NTU Interface Screen At the Monitor menu ( Figure 30 ), type to display the Monitor NT U Interf ace screen ( Fi gure 32 ).
700-701-10 0-02 Viewi ng Status UTU-701 and ETU-751 List 1 August 9, 2002 51 Monitor HDSL Span 1 Screen The HDSL Span 1 s creen ( Figure 3 3 ) displays the circuit per formance an d 24-hour erro r counts at the HDSL span 1 interface.
Viewi ng Status 700-701-10 0-02 52 August 9, 2002 UTU-701 and ETU-751 List 1 H ISTORY M ENU The Histor y menu co ntains t he following status screens: • LTU/NTU Interfaces that d isplay alarm performance history for th e LTU and NTU interface. • HDSL Span that displ ays 24-ho ur, 7-day, an d alarm perf ormance history for the HDSL span.
700-701-10 0-02 Viewi ng Status UTU-701 and ETU-751 List 1 August 9, 2002 53 LTU and NTU Interface Performance Hist ory Screens At the History menu ( Figure 34 ), type to select the Hist ory LTU In terf ace menu ( Figur e 35 ).
Viewi ng Status 700-701-10 0-02 54 August 9, 2002 UTU-701 and ETU-751 List 1 LTU and NTU Interface Alarm His tory Screens At the History LTU or History N TU Interface menu , typ e the key to select an Alarm History status s creen. The LTU Interface Alarm History screen is shown in Figure 3 7 .
700-701-10 0-02 Viewi ng Status UTU-701 and ETU-751 List 1 August 9, 2002 55 HDSL Span P erformance Hist ory Screens At the History menu ( Figure 34 ), type to select the Hi stor y HDSL Span 1 menu ( Figure 38 ).
Viewi ng Status 700-701-10 0-02 56 August 9, 2002 UTU-701 and ETU-751 List 1 The 24 H our Hist ory screen for HDSL Sp an 1 con tains three columns of data that show (fr om left to righ t) the: • Starting time of e ach 15-minut e interval. • Number of ES/UAS at the LTU end of the HDSL span ( LTU-1) fo r each interval.
700-701-10 0-02 Viewi ng Status UTU-701 and ETU-751 List 1 August 9, 2002 57 HDSL Span 1 Alarm History Screens At the Histor y HDSL Spa n 1 menu ( Figure 38 ), type to select th e Alarm History status screen for HDSL Span 1 ( Figure 41 ).
Viewi ng Status 700-701-10 0-02 58 August 9, 2002 UTU-701 and ETU-751 List 1 Clear Hi story Screens Use the f ollowing options to clear the 24 Hour, 7 D ay, or Alarm Hist ory stat us scr eens: • Clr.
700-701-10 0-02 Viewi ng Status UTU-701 and ETU-751 List 1 August 9, 2002 59 Tab le 29 . Inventory Screen Data Field Descrip tion Network Diagram Displ ays the con figurati on of the LT U or NTU circuit . Prod uct Displays the model numbers of the LTU, NTU , and any doubl er units t hat comp rise the cha nnel.
Testing 700-701-10 0-02 60 August 9, 2002 UTU-701 and ETU-751 List 1 T ESTING From the main conso le screen ( Figu re 29 ), type to display the Test menu from whi ch you can set and ru n loopback and BER tests ( Figure 43 ). Figure 43. Te st Me nu Scr een Table 30 on page 61 lists the Test menu opti ons.
700-701-10 0-02 Testing UTU-701 and ETU-751 List 1 August 9, 2002 61 Table 30. Test Menu Options Operatin g Option De fault Settin g Network Diagram Shows th e loopba ck position and direct ion when t he loopb ack is enabl ed and active . Lpbk Dir Select s one of three loopback d irection mo des: OFF No loopb acks a re activ e.
Firmware D ownload Utility 700-701-10 0-02 62 August 9, 2002 UTU-701 and ETU-751 List 1 F IRMWARE D OWNLOAD U TI LITY This section describes th e ETSI Firmware Download utility and how to use it to upgrade the line and deskt op unit firmware.
700-701-10 0-02 Firmware Download Utility UTU-701 and ETU-751 List 1 August 9, 2002 63 Initiate the D ownload and Navi gate the Menus To initiate th e download pr ocess, go to t he DOS prompt and type: dnl. Table 32 describes ETSI Firmware User Selectable Download Menu Options.
Referenc e Informati on 700-701-10 0-02 64 August 9, 2002 UTU-701 and ETU-751 List 1 R EFER ENCE I NFORMA TION This sect ion list s the pino uts for the ETU- 751C rear panel connectors and the ECA-80x co nnector adapters . ETU-751C C ONNECTOR P INOUT S The pinouts for the ETU-751 C rear panel conn ectors are list ed in Table 34 and Table 35 .
700-701-10 0-02 Reference Information UTU-701 and ETU-751 List 1 August 9, 2002 65 ECA-800 C ONNECTOR A DAPTER (DB2 5M TO M34F FOR V.35) The ECA-800 con nector adapter ( Figur e 45 ) con verts the DB25F data port connector on the desktop unit r ear panel to a standard V.
Referenc e Informati on 700-701-10 0-02 66 August 9, 2002 UTU-701 and ETU-751 List 1 ECA-801 C ONNECTOR A DAPTER (DB2 5M TO DB15F FOR X.21) The ECA-801 con nector adapter ( Figur e 46 ) converts the DB25F data port connector o n the desktop unit rear panel to a stand ard X.
700-701-10 0-02 Reference Information UTU-701 and ETU-751 List 1 August 9, 2002 67 Figur e 47. ECA-802 DB9M to RJ-45 Connect or Adap ter, P art Numb er 150- 1472-01 Table 38.
Referenc e Informati on 700-701-10 0-02 68 August 9, 2002 UTU-701 and ETU-751 List 1 ECA-804 C ONNECTOR A DAPTER (DB9 M TO F OUR -P OSITION T ERMINAL B LOCK ) The ECA-804 con nector adapter ( Figur e 48 ) converts the DB9F HDSL line c onnector on the desktop unit r ear panel to a four-position termin al-block style connector.
700-701-10 0-02 Product Support UTU-701 and ETU-751 List 1 August 9, 2002 69 P RODUCT S UPPOR T ADC Customer Service Gro up provides exp ert pre-sales an d post-sales support and training for all its products.
Abbrevi ations 700-70 1-100-02 70 August 9, 2002 UTU-701 and ETU-751 List 1 A BBRE VIATIO NS AIS Alarm Indication Signal LL Local Loopback ALM Alarm LOC Local ANSI American Nation al Standards Institu.
C ERTI FICA TION AND W ARRANTY D IRECTIVE EN300 386-2 C OMPLIANCE To indicate compliance with EN300 386-2 , these produ cts have be en affixed with th e CE mark.
DNV C ertificatio n, Inc. REGISTERED FIRM IS O 900 1/TL 9000 ADC DSL Systems , Inc. 14402 Fr anklin Avenue Tustin, CA 9278 0-70 13 Tel: 714.8 32.99 22 Fax: 714.
An important point after buying a device ADC ETU-751C (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought ADC ETU-751C yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data ADC ETU-751C - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, ADC ETU-751C you will learn all the available features of the product, as well as information on its operation. The information that you get ADC ETU-751C will certainly help you make a decision on the purchase.
If you already are a holder of ADC ETU-751C, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime ADC ETU-751C.
However, one of the most important roles played by the user manual is to help in solving problems with ADC ETU-751C. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device ADC ETU-751C along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
