Manuale d’uso / di manutenzione del prodotto HDSL2 del fabbricante ADTRAN
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HDSL2 for General Distribution Inst allation and Maintenance Practice Document Numbe r: 61223HDSL2L2-5B June 2005 Part Number Descripti on CLEI 1181113L2 Total Access 300 0 H2TU-C T1L71YLA_ _ 1223001L.
HDSL2 for General Distribution Installation and Maintenance Practice ii 61223HDSL2L2-5B Front Matter T rademar ks Any brand names and product names includ ed in this manual are trademarks, registered trademarks, or trade names of their respectiv e holders.
HDSL2 for General Distribution Installatio n and Maintenance Practice 61223HDSL2L2-5 B iii R e vision Histor y Con v entions The following typographical conventi ons are used in this document: This font indicates a cross-reference link. First-ti me references to tables and figures are shown in this font .
HDSL2 for General Distribution Installation and Maintenance Practice iv 61223HDSL2L2-5B T r aining ADTRAN offers training courses on ou r produc ts. These courses includ e overviews on product features and functions while covering applicat ions of ADTRAN’s prod uct lines.
61223HDSL2L2-5 B v Contents Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Illustrations . . . . . . . . . . . . . . . . . . . . . .
Contents HDSL2 for General Distribution Installation and Mainten ance Practice vi 61223HDSL2L2-5B Scratch Pad, Circuit ID, Time/ Date Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Terminal Modes .
HDSL2 for General Distribution Insta llatio n and Maintenance Practice Contents 61223HDSL2L2-5 B vii Fast Retrain Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-10 Appendix C Front Panel DSX and MUX Mode Test Access .
Contents HDSL2 for General Distribution Installation and Mainten ance Practice viii 61223HDSL2L2-5B Figure 20. Span Status Screen, Total Access 3000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Figure 21. Status Screen Legend .
HDSL2 for General Distribution Insta llatio n and Maintenance Practice Contents 61223HDSL2L2-5 B ix T a bles Table 1. HDSL2 Central Office Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Table 2. HDSL2 Remote Modules .
Contents HDSL2 for General Distribution Installation and Mainten ance Practice x 61223HDSL2L2-5B.
61223HDSL2L2-5 B 1 HDSL2 f or Gener al Distribution PR ODUCT DESCRIPTION The HDSL2 modules referenced in this document are used to deploy a T1 circuit using 2-wire metallic facilities. HDSL2 provides extended range to DS1/T1 transpor t while pr oviding spectral compatibility with ADSL and other transport te chnologies .
Product Description HDSL2 for General Distribution Installation and Maintenance Practice 2 61223HDSL2L2-5B Illustrations Figure 1 illustrates the front panels of the ADTR AN H2TU-C modules approved for general distribution.
HDSL2 for General Di stribution Installatio n and Maintenance Practice Product Descripti on 61223HDSL2L2-5 B 3 Figure 2 illustrates the front panels of the ADTR AN H2TU-R modules approved for general distribution.
Product Description HDSL2 for General Distribution Installation and Maintenance Practice 4 61223HDSL2L2-5B Compliance ADTRAN HDSL2 modules are NRTL listed to the applicable UL standards. The HDSL2 modules are to be installed in a restricted access location and in a type “B” or “E” enc losure only.
HDSL2 for General Distribution Insta llatio n and Maintenance Practice Installation Guidelines 61223HDSL2L2-5 B 5 INSTALLA TION GUIDELINES After unpacking an HDS L2 module, insp ect it for damage. If damage has occurred, file a claim with the carrier, then contact ADTRAN Custom er Service.
Installation Guidelines HDSL2 for General Distribution Instal lation and Maintenance Practice 6 61223HDSL2L2-5B P o wering Options H2TU-C A n H 2 T U - C m o d u l e i s c a p a b l e o f s p a n p o w e r i n g a n H 2 T U - R m o d u l e b y a p p l y i n g c u r r e n t t o t h e local loop.
HDSL2 for General Distribution Insta llatio n and Maintenance Practice Installation Guidelines 61223HDSL2L2-5 B 7 4. Slide the unit into the module slot. Simultaneous thumb pressure at the top and bottom of the unit will ensure that the module is firmly seated against the backplane of the chassi s.
Connections HDSL2 for General Distribution Installation and Maintenance Practice 8 61223HDSL2L2-5B CONNECTIONS An H2TU-C module occupies one card slot in the respective Office Repeater Bay for which it is named. Power and alarm signals are provided to t he module through the backplane of t he shelf.
HDSL2 for General Distribution Insta llatio n and Maintenance Practice Connections 61223HDSL2L2-5 B 9 Figure 5. HDSL2 Edge Connector Wiring, continued 3192 Edge Connector Wiring 1 2 3 4 5 6 7 8 9 10 A.
Provisioning HDSL2 for General Distribution Installation and Maintenance Practice 10 61223HDSL2L2-5B T otal Access 3000 H2 TU-C Edge Connector The Total Access 3000 shelf delivers DSX-1 from th e network to the H2TU-C via connectors on the backplane labeled Pair 7 and Pair 8 .
HDSL2 for General Distribution Installatio n and Maintenance Practice Provisioning 61223HDSL2L2-5 B 11 T able 6. Pr o visioning Options Provisioning Option Option Sett ings Default Settings 1. DSX-1 Line Build Out 1 0-133 feet, 133-266 feet, 266-399 feet, 399-533 feet, 533-655 feet, EXTERNAL 0 to 133 feet 2.
HDSL2 System Testing HDSL2 for General Distrib ution Installation and Mainten ance Practice 12 61223HDSL2L2-5B Pr ov isioning Options, T otal Access 3000 H2TU-C The Total Access 3000 H2TU-C is provisione d through the SCU on the Total Access 3000 chassis.
HDSL2 for General Distribution Installatio n and Maintenance Practice HDSL2 System Testing 61223HDSL2L2-5 B 13 H2TU-C Bantam Ja cks The front panel of an H2 TU-C module contains bo th metallic splitting ( EQ ) and monitor ( MON ) bantam jacks. The EQ jacks provide an intrusive access point, interrupting signal access to the local loop.
HDSL2 System Testing HDSL2 for General Distrib ution Installation and Mainten ance Practice 14 61223HDSL2L2-5B Figure 7. Bantam Jack Arrangements Loopbac ks The ADTRAN HDSL2 modules respond to three di fferent loopback activation processes.
HDSL2 for General Distribution Installatio n and Maintenance Practice HDSL2 System Testing 61223HDSL2L2-5 B 15 In addition to network-si de loopbacks, an H2 TU-C module provid es customer-side loo pbacks initiated by using either the terminal control port or in-band l oop codes.
H2TU-C Front Panel Operati on HDSL2 for General Distribution Installation and Mainten ance Practice 16 61223HDSL2L2-5B H2TU-C F R ONT PANEL OPERATION LED indicators mou nted on the front pane l of th e unit provide status of the HDSL2 circuit. Each indicator is described in Tabl e 9 for the H2TU-C and Table 10 for the H2TU-R .
HDSL2 for General Di stribution Installatio n and Maintenance Practice Control Port Operation 61223HDSL2L2-5 B 17 CONTROL POR T OPERATION The H2TU-C modules pr ovide a DB-9 connector o n the front pan el that supplies an RS-232 interface for connection to a controlling terminal .
Control Port Operation HDSL2 for General Distrib ution Installation and Maintenance Practice 18 61223HDSL2L2-5B Scr eens The screens illustrated in Figure 10 through Figure 47 are for an HDSL2 circuit deployed with the ADTRAN HDSL2 technology. The circuit in cludes an H2TU-C module and an H2TU-R module.
HDSL2 for General Di stribution Installatio n and Maintenance Practice Control Port Operation 61223HDSL2L2-5 B 19 Descripti ons for th e menu item s on the HDSL2 Main Menu include the following: • .
Control Port Operation HDSL2 for General Distrib ution Installation and Maintenance Practice 20 61223HDSL2L2-5B Figure 12. Total Access Main Menu The Access Module Menus screen ( Figure 13 ) will display the access modules occupying the Total Access 3000 shelf.
HDSL2 for General Di stribution Installatio n and Maintenance Practice Control Port Operation 61223HDSL2L2-5 B 21 Figure 14. Total Access 3000 H2TU-C Main Menu Screen HDSL2 Unit Infor mation The Unit Information screen ( Figure 15 ) provides detailed produc t information on each component in the HDSL2 circuit.
Control Port Operation HDSL2 for General Distrib ution Installation and Maintenance Practice 22 61223HDSL2L2-5B Provisioning The Provisioning menu ( Figure 16 ) displays current settings.
HDSL2 for General Di stribution Installatio n and Maintenance Practice Control Port Operation 61223HDSL2L2-5 B 23 To re-deploy this unit, press D which restores the factory default settings to those shown in Table 6 and Table 7 . The options shown in these tables ar e available with the H2TU-R (P/N 1223026L2).
Control Port Operation HDSL2 for General Distrib ution Installation and Maintenance Practice 24 61223HDSL2L2-5B Span Status The Span Status Scre en ( Figure 19 ) provides quick access to st atus information for each HDSL2 receiver in the circuit. Figure 19.
HDSL2 for General Di stribution Installatio n and Maintenance Practice Control Port Operation 61223HDSL2L2-5 B 25 Status Screen Le gend Screen The Status Screen Legend ( Figure 21 ) provides a description of me ssages used on the Status screens. Figure 21.
Control Port Operation HDSL2 for General Distrib ution Installation and Maintenance Practice 26 61223HDSL2L2-5B T otal Access 3000 H2TU-C A uto In Ser vice Status Screen The Auto In Service Status Scr een ( Figure 23 ) provides the status of the Auto In Service feature.
HDSL2 for General Di stribution Installatio n and Maintenance Practice Control Port Operation 61223HDSL2L2-5 B 27 Loopbacks and T est The Loopback and Test Commands screen ( Figure 24 ) provides the user with the ability to initiate or terminate all avai lable HDSL2 loopbacks.
Control Port Operation HDSL2 for General Distrib ution Installation and Maintenance Practice 28 61223HDSL2L2-5B Figure 25. Total Access 3000 H2TU-C Loopback and Te st Commands Screen BER T T est Functions The Bit Error Rate Testing (BERT) Tes t Screen ( Figure 26 ) is accessed by selecting the associated number on the Loopback and T est menu .
HDSL2 for General Di stribution Installatio n and Maintenance Practice Control Port Operation 61223HDSL2L2-5 B 29 Figure 26. BERT Test Screen NO TE When the BERT is started, the H2 TU-R will automatically be put in loopback and the default test leng th of 2 hours will be initiated.
Control Port Operation HDSL2 for General Distrib ution Installation and Maintenance Practice 30 61223HDSL2L2-5B Option 4, Enter Test Timeout from t he BERT Test Screen displays the Timeout Screen ( Figure 28 ).
HDSL2 for General Di stribution Installatio n and Maintenance Practice Control Port Operation 61223HDSL2L2-5 B 31 P erfor manc e Histor y The Performance History screens ( Figure 30 ) display the historical HDSL2 and T1 perfor- mance data in several different registers.
Control Port Operation HDSL2 for General Distrib ution Installation and Maintenance Practice 32 61223HDSL2L2-5B Figure 31. Performance Data Definitions, Loop Figure 32.
HDSL2 for General Di stribution Installatio n and Maintenance Practice Control Port Operation 61223HDSL2L2-5 B 33 Scratch P ad, Cir cuit ID, Time/Date Screen The Scratch Pad, Cir cuit ID, Time/Date screen ( Fig ure 33 ) provides a logging medium fo r circuit information.
Control Port Operation HDSL2 for General Distrib ution Installation and Maintenance Practice 34 61223HDSL2L2-5B T er minal Modes The module used in this example incl udes two ter minal emulation modes. • Manual Update Mode - This mode is used to manually update the screens.
HDSL2 for General Di stribution Installatio n and Maintenance Practice Control Port Operation 61223HDSL2L2-5 B 35 Alar m Histor y The Alarm History screens are divide d into three separate screens: .
Control Port Operation HDSL2 for General Distrib ution Installation and Maintenance Practice 36 61223HDSL2L2-5B HDSL2 Span Histor y The HDSL2 Span History screen ( Figure 36 ) displays th e following .
HDSL2 for General Di stribution Installatio n and Maintenance Practice Control Port Operation 61223HDSL2L2-5 B 37 HDSL2 Facility Alar m Histor y The HDSL2 Facility Alarm History screen ( Figure 37 ) displays the following information: •D C O p e n • Over-curr ent (short) • Ground fa ult • Power cycle Figure 37.
Control Port Operation HDSL2 for General Distrib ution Installation and Maintenance Practice 38 61223HDSL2L2-5B Ev ent Histor y The Event History screen ( Figure 38 ) provides a log history of HDSL2 circuit events. The following is a list (but not all- inclusive) of possible events: Figure 38.
HDSL2 for General Di stribution Installatio n and Maintenance Practice Control Port Operation 61223HDSL2L2-5 B 39 System PM/Scre en Repor t The System PM/Screen Report option ( Figure 39 ) offers four types of reports on performance monitoring.
Control Port Operation HDSL2 for General Distrib ution Installation and Maintenance Practice 40 61223HDSL2L2-5B T r oubleshooting The Troubleshooting screens include the new feat ure “Splice Detection.” This and other new features are described in more detail in “Appendix B, HDSL2 Featu res” .
HDSL2 for General Di stribution Installatio n and Maintenance Practice Control Port Operation 61223HDSL2L2-5 B 41 T r oubleshooting Guidance Selecting the option number associated with the Troubleshoo.
Control Port Operation HDSL2 for General Distrib ution Installation and Maintenance Practice 42 61223HDSL2L2-5B General Infor mation The General Information screen ( Figure 43 ), from the main Troubleshooting screen, provides a summary of the deployment guidelines n ecessary to provision this HDSL2 circuit.
HDSL2 for General Di stribution Installatio n and Maintenance Practice Control Port Operation 61223HDSL2L2-5 B 43 Chronic Cir cuit Guidance Selecting the Chronic Circuit Guidance option displays the Chronic Circuit Problems screen ( Figure 44 ).
Control Port Operation HDSL2 for General Distrib ution Installation and Maintenance Practice 44 61223HDSL2L2-5B The ( B ) Back command will allow the technician to sc roll back through the last 14 days Splice Detection Results.
HDSL2 for General Di stribution Installatio n and Maintenance Practice Control Port Operation 61223HDSL2L2-5 B 45 Figure 46. Histogram Screen R eset Splice Detector Choosing Reset Splice Detector will prompt to make sure a reset is desired. If Y (yes) is chosen the splice detector will re-ini tialize and start running again.
Control Port Operation HDSL2 for General Distrib ution Installation and Maintenance Practice 46 61223HDSL2L2-5B Vir tual T er minal Control The Virtual Terminal Control screen ( Figure 47 ) is availabl e on all modules except the Total Access 3000 H2TU-C.
HDSL2 for General Di stribution Installatio n and Maintenance Practice Control Port Operation 61223HDSL2L2-5 B 47 T otal Access 30 00 H2TU-C Flash Upg r ade Ability to download new firmware for the unit is available via the Total Access H2TU-C Flash Image screen ( Figure 48 ).
Control Port Operation HDSL2 for General Distrib ution Installation and Maintenance Practice 48 61223HDSL2L2-5B Figure 49. Download H2TU-C via Y-Modem Menu Figure 50 illustrates a Flash upgr ade session in progress.
HDSL2 for General Di stribution Installatio n and Maintenance Practice Control Port Operation 61223HDSL2L2-5 B 49 The Download H2TUC via TFTP menu ( Figure 51 ) is utilized to perform a TFTP file transfer from a remotely located computer/server to the H2TU-C.
Control Port Operation HDSL2 for General Distrib ution Installation and Maintenance Practice 50 61223HDSL2L2-5B Boot Block The Boot Block Status screen ( Figure 52 ) provides the status of the Boot Block sector, which in rare cases can becom e locked.
HDSL2 for General Distribution Insta llatio n and Maintenance Practice HDSL2 Deployment Gui delines 61223HDSL2L2-5 B 51 HDSL2 DEPLO YMENT GUIDELINES The ADTRAN HDSL2 system is designed to prov ide DS1 based services over loops designed to comply with carrier service ar ea (CSA) guidelines.
Maintenance HDSL2 for General Distribution Installation and Maintenance Practice 52 61223HDSL2L2-5B Loop loss per kilofoot for standa rd wire gaug es is summarized in Table 12 . An approximation for the maximu m amount of wid eband noi se as measured using an F filter on an HDSL2 loop having 35 dB loss is < –47 dBrnF.
HDSL2 for General Distribution Insta llatio n and Maintenance Practice Troubleshooting 61223HDSL2L2-5 B 53 T R OUBLESHOOTING Table 13 provides a H2 TU-C troubleshooting guide t o assist in problem reso lution. T able 13. H2TU-C T roubleshooting Gu idelines Condition Solution All front panel indicators are off .
Troubleshooting HDSL2 for General Distributio n Installation and Maintenance Practice 54 61223HDSL2L2-5B Table 14 provides an H2 TU-R troubleshoo ting guide to assist in p roblem resolution. T able 14. H2TU-R T roubleshooting Gu idelines Condition Solution All front panel indicators are off.
HDSL2 for General Distribution Installatio n and Maintenance Practice Specifications 61223HDSL2L2-5 B 55 SPECIFICA TIONS Table 15 lists the product specifications for ea ch H2TU-C included in this practice.
Specifications HDSL2 for General Distributio n Installation and Mainten ance Practice 56 61223HDSL2L2-5B Tests Diagnostics: Self-Test Local Loopba ck (H2TU-C) Remote Loopback (H2TU-R) Physical Dimensions: Total Access 3000 H2TU-C 220 H2TU-C: DDM+ H2TU -C: 3192 H2TU-C: Weight: 5.
HDSL2 for General Distribution Installatio n and Maintenance Practice Specifications 61223HDSL2L2-5 B 57 Table 16 lists the product specifications for each H2TU-R included in this practice.
Specifications HDSL2 for General Distributio n Installation and Mainten ance Practice 58 61223HDSL2L2-5B Tests Diagnostics: Self Test Loopback (H2TU-R) initia ted with T1 NIU in- band codes Loopback (.
61223HDSL2L2-5 B A-1 A ppendix A HDSL2 Loopbac ks HDSL2 LOOPBAC K AND CONTRO L CODES This appendix describes the operation of the HDSL2 system in detection of inband and ESF facility data link loopback codes. Upon deactivation of a loopback, the HD SL2 system will synchronize automatically.
HDSL2 Loopback and Control Codes HDSL2 for General Distribution Installation and Maintenance Practice A-2 61223HDSL2L2-5B NO TE In all control code sequences presented, the inband codes are shown leftmost bit transmitted first, and the ESF data link codes with rightmost b it transmit ted first.
HDSL2 for General Distribution Insta llatio n and Maintenance Practice HDSL2 Loopback and Control Codes 61223HDSL2L2-5 B A-3 T able A-2 . In-Band Addr essa ble Loopback Codes (All codes listed below must be sent for a minimu m of 5 seconds in order for them to be d etected and acted upon.
HDSL2 Loopback and Control Codes HDSL2 for General Distribution Installation and Maintenance Practice A-4 61223HDSL2L2-5B Loopback Query D5D5 (1101 0101 1101 0 101) (N) If unit is in loopback to wards pa ttern, errors are periodically injected toward pattern as long as pat- tern is present.
61223HDSL2L2-5 B B-1 A ppendix B HDSL2 F ea tur es HDSL NEW ENHANCED F EATURE OVER VIEW The new HDSL2 and HDSL4 products contain new features to enhance their performance and help the customer reduce down time.
HDSL New Enhanced Feature Overview HDSL2 for General Distribution In stallation and Maintenance Practice B-2 61223HDSL2L2-5B Figure B-1. TScan Diagnostic Capabilities NO TE For implementation of TScan please contact an ADTRAN sales representative. Splice Detection F eature Runtime TScan 2.
HDSL2 for General Distribution Insta llatio n and Ma intenance Practice HDSL New Enhanced Feature Overview 61223HDSL2L2-5 B B-3 The support mechani sms for this feature can l ogically be divided into the following six segments: These support mechanisms are described in the following subsections.
HDSL New Enhanced Feature Overview HDSL2 for General Distribution In stallation and Maintenance Practice B-4 61223HDSL2L2-5B EEPROM Suppor t The results of the splice detector are stored to the Elec tronically Erasable Programmable Read-Only Memory (EEPROM) on a daily basis at the same time the 24-hour PM registers are stored to EEPROM.
HDSL2 for General Distribution Insta llatio n and Ma intenance Practice HDSL New Enhanced Feature Overview 61223HDSL2L2-5 B B-5 Splices that are varying in impedance will caus e the HDSL data pump to see a reduced and/or fluctuating signal quality (margin).
HDSL New Enhanced Feature Overview HDSL2 for General Distribution In stallation and Maintenance Practice B-6 61223HDSL2L2-5B Figure B-3. Splice Results Scre en View Splice Histo gram Screen The View Splice Histogram Screen ( Figure B-4 ) displays the coun ters that the splice detector uses to make its result decision.
HDSL2 for General Distribution Insta llatio n and Ma intenance Practice HDSL New Enhanced Feature Overview 61223HDSL2L2-5 B B-7 Figure B-4. Splice Histogram Screen Compatibility The H2TU-C and H2TU-R .
HDSL New Enhanced Feature Overview HDSL2 for General Distribution In stallation and Maintenance Practice B-8 61223HDSL2L2-5B Using the Bad Splice Detector A brief synopsis of steps that might be utilize d on a trouble analysis are as follows: 1.
HDSL2 for General Distribution Insta llatio n and Ma intenance Practice HDSL New Enhanced Feature Overview 61223HDSL2L2-5 B B-9 Ev e nt Histor y Screen The Event History screen ( Figure B-5 ) shows the messages reported in the event log due to the splice detector.
HDSL New Enhanced Feature Overview HDSL2 for General Distribution In stallation and Maintenance Practice B-10 61223HDSL2L2-5B power. When th e software detects the power fault, the data pump goes into a fault br idging mode to protect the data pump fil ters and to maintain service until the anomaly clears.
61223HDSL2L2-5 B C-1 A ppendix C F r ont P anel DSX and MUX Mode T est Access GENER AL Figure C-1 through Figure C-3 are DSX-1 fed modes of operation, and Figure C-4 through Figure C-7 are MUX fed mo des of operation.
DSX Mode Test Access HDSL2 for General Distribution Installation and Maintenance Practice C-2 61223HDSL2L2-5B Figure C-1. DSX MON, Tx to Customer DSX MON, Rx fr om Customer The Rx of the BERT receives data from the RX MON jack ( Figure C-2 ). This data has a monitor jack impedance of 432 ohms and comes fr om the customer originated data.
HDSL2 for General Di stribution Installatio n and Mainte nance Practice MUX Mode Test Access 61223HDSL2L2-5 B C-3 Figure C-3. DSX EQ, Tx to Customer, Rx from Customer MUX MODE T EST ACCESS MUX Mode tests through a MUX on the Total Access 3000 shelf. MUX MON, Tx to Customer The Rx of the BERT receives data from the TX MON EQ jack ( Figure C -4 ).
MUX Mode Test Access HDSL2 for General Distribution Installation and Maintenance Practice C-4 61223HDSL2L2-5B MUX MON, Rx from Customer The Rx of the BERT receives data from the RX MON jack ( Figure C-5 ). This data is 432 ohm copy of the data that the H2TU-C will re ceive from the customer and route to the Total Access shelf's MUX (network).
HDSL2 for General Di stribution Installatio n and Mainte nance Practice MUX Mode Test Access 61223HDSL2L2-5 B C-5 MUX EQ , Tx to Customer , Rx fr om Customer The Tx of the BERT is connected to the EQ TX jack, and the Rx of the BERT is connected to the RX EQ jack ( Figure C-7 ).
MUX Mode Test Access HDSL2 for General Distribution Installation and Maintenance Practice C-6 61223HDSL2L2-5B This page is intentionally blank..
61223HDSL2L2-5 B D-1 A ppendix D W ar r anty W AR RANTY AND CUSTOMER SER VICE ADTRAN will replace or repair this product within the warranty period if it do es not meet its published specifications or fails while in se rvice. Warr anty information can be found at www.
Carrier Networks Division 901 Explorer Blvd. Huntsville, AL 3580 6 ®.
Un punto importante, dopo l’acquisto del dispositivo (o anche prima di acquisto) è quello di leggere il manuale. Dobbiamo farlo per diversi motivi semplici:
Se non hai ancora comprato il ADTRAN HDSL2 è un buon momento per familiarizzare con i dati di base del prodotto. Prime consultare le pagine iniziali del manuale d’uso, che si trova al di sopra. Dovresti trovare lì i dati tecnici più importanti del ADTRAN HDSL2 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso ADTRAN HDSL2 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul ADTRAN HDSL2 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il ADTRAN HDSL2, ma non hai ancora letto il manuale d’uso, dovresti farlo per le ragioni sopra descritte. Saprai quindi se hai correttamente usato le funzioni disponibili, e se hai commesso errori che possono ridurre la durata di vita del ADTRAN HDSL2.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il ADTRAN HDSL2. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo ADTRAN HDSL2 insieme con le istruzioni su come risolverli. Anche se non si riesci a risolvere il problema, il manuale d’uso ti mostrerà il percorso di ulteriori procedimenti – il contatto con il centro servizio clienti o il servizio più vicino.
