Instruction/ maintenance manual of the product Switched Rack Power Distribution Unit (PDU) APC
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® USER’S GUIDE switched rack pdu Contents i Introdu ction -- 1 Product De scripti on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Features of the PDU 1 Acce ss Proc edures . . . . . . . . . . . . . . . . . . . . . . . . . .
® USER ’ S GUIDE switched rack pdu ii Network opti on 19 System option 20 Web Interface -- 21 How t o L og On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Overview 21 Supported Web browsers 22 URL address f ormats 23 Summary Page .
® USER ’ S GUIDE switched rack pdu iii Overview 43 Sev erity l evel s 4 4 Event log action 44 SNMP traps action 44 Email acti on 45 Event Recipients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Overview 46 Trap receiver set tings 46 E-mail Feature .
® USER ’ S GUIDE switched rack pdu iv Ping utili ty (control console) 65 FTP Server, and Telnet & Web options 66 SNMP 67 Email 68 Boot Mode -- 69 Intr oduc tion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 9 Overview 69 DHCP & BOOTP boot proc ess 70 DHCP Configu ration Settings .
® ® ® ® USER ’ S GUIDE switched rack pdu 1 Intr oduction Pr oduct Description Featur es of the PDU The APC ® Switched Rack Power Distribution Unit (PDU) is a stand-alone, network-manageable de vice that allows programma ble control of eig ht, sixteen, or twenty-four p ower outlets (depending on t he model).
® ® ® ® USER ’ S GUIDE switched rack pdu 2 Initial setup Y ou must define three TCP/IP settings for the Switched Rack PDU before it can operate on the ne twork. • IP address of the PDU • Subnet mask • IP address of the defa ult gateway The PDU do es not provid e power protection.
® ® ® ® USER ’ S GUIDE switched rack pdu 3 Access Pr ocedur es Overview The PDU has two intern al interfaces (cont rol console and Web interface) which provide m enus with options that all ow you to manage the PD U.
® ® ® ® USER ’ S GUIDE switched rack pdu 4 T ypes of user accounts The PDU has three leve ls of access (Admi nistrator , Device M anager , and Outlet user), all of which are protected by p assword and user n ame requirements. • An Administrator can us e all of the mana gement menus available in the control console and the Web interface.
® ® ® ® USER ’ S GUIDE switched rack pdu 5 How to Recover Fr om a Lost Passwor d Y ou can use a local co mputer that conn ect s to the PDU throu gh the serial port on the front panel of the unit. 1. Select a serial port at th e local computer , and disable any service which uses that port.
® ® ® ® USER ’ S GUIDE switched rack pdu 6 Upgrading Firmwar e 0 Y ou can use a local co mputer that conn ect s to the PDU throu gh the serial port on the front panel of the unit. 1. Select a serial port at th e local computer , and disable any service which uses that port.
® ® ® ® USER ’ S GUIDE switched rack pdu 7 9. In the terminal program, send the file usin g the XMODEM protocol. Upon completion of th e transfer , the console will prom pt you to restore the baud rate to norma l. The PDU will reboot whe n the download i s complete.
® ® ® ® USER ’ S GUIDE switched rack pdu 8 Fr ont Panel Single-phase Thr ee-phase Link - Rx/Tx 10 / 100 Status Seri al P ort Rese t Pre ss a nd hol d to inver t disp lay - W ar ning - OK - Overl oad Link - Rx/Tx 10 / 100 Status Serial Port Rese t Pre ss to sele ct li ne.
® ® ® ® USER ’ S GUIDE switched rack pdu 9 Item Function Load Indicator LED Identifies overload and warn ing conditions for the displayed ph ase. See Load indi cator LED . Input Selector On three-phase models, press the input selector to monitor the current of the next phase.
® ® ® ® USER ’ S GUIDE switched rack pdu 10 Link-RX /TX (10/ 100) LE D This LED indicates the n etwork status. Status LED This LED indicates the n etwork status of the PDU. Condition Descr iption Off The device which connects the PDU to the network is off or not operating correctly .
® ® ® ® USER ’ S GUIDE switched rack pdu 11 Load indicator LED The load indicator LED identifies overload and warning conditions for the displayed phas e. Condition Descr iption Solid G reen The displayed phase is below the current overload thresholds.
® ® ® ® USER ’ S GUIDE switched rack pdu 12 Wa t c h d o g F e a t u r e s Overview T o detect internal problems and recover from unanticipated inputs, the PDU uses internal, system-wide wa tchdog mechanism s. When it restart s itself to recover from an internal problem, a Syste m: W armstart event is recorded in the Event Log.
® ® ® ® USER ’ S GUIDE switched rack pdu 13 Contr ol Console How to Log On Overview Y ou can use either a l ocal (serial) conne ction, or a remote (T elnet) connection to access th e control console .
® ® ® ® USER ’ S GUIDE switched rack pdu 14 Local access to the contr o l consol e Y ou can use a local co mputer that conn ect s to the Switched Rack PDU through the serial port on the front of th e unit. 1. Select a serial port at th e local computer , and disable an y service which uses that port.
® ® ® ® USER ’ S GUIDE switched rack pdu 15 Main Scr een Example main scr e en The main screen that is dis played when you lo g on to the control console of a Switched Rack PDU. Infor matio n and status fiel ds Main scr e en info rmatio n fiel ds.
® ® ® ® USER ’ S GUIDE switched rack pdu 16 Name : MS3 Test Unit Contact : Bill Cooper Location : Testing Lab •A n Up Time field reports how long the Switched Rack PDU has been running since it was last reset or since po wer was applied. Up Time : 0 Days 0 Hours 43 Minutes • T wo fields iden tify when you logged on, by Date and Tim e .
® ® ® ® USER ’ S GUIDE switched rack pdu 17 Main scr een status fields. •A Stat field rep ort s the Switched Ra ck PDU status. S t a t:P +N +A + • A Switched Rack PDU model and name fie ld reports the st atus of the Switched Rack PDU.
® ® ® ® USER ’ S GUIDE switched rack pdu 18 Contr ol Console Menus Menu stru ctur e The menus in the contr ol console list opt ions by number and name . T o use an option, type the co rresponding number and press E NTER , the n follow any on-screen instructio ns.
® ® ® ® USER ’ S GUIDE switched rack pdu 19 Main menu The main control consol e menu has optio ns that provide access to the management features of the control con sole: 1- Device Manager 2- Network 3- System 4- Logout s Dev ice Manage r opt ion This option accesses th e Device Manage r menu.
® ® ® ® USER ’ S GUIDE switched rack pdu 20 System option T o do any of t he following tasks, see System Menu : • Control Administrator , Device Ma nager , and Outlet User a ccess • Define t.
® ® ® ® USER ’ S GUIDE switched rack pdu 21 We b I n t e r f a c e How to Log On Overview Y ou can use the DNS name or System IP address of the Switched Rack PDU for the URL addres s of the Web interface.
® ® ® ® USER ’ S GUIDE switched rack pdu 22 Supported W eb br owsers Y ou can use the Microsoft ® Internet Explorer (IE) browser (5.0 or higher) or the Netscape ® browser (4.0.8 or higher) to access the Switch ed Rack PDU through its Web interface.
® ® ® ® USER ’ S GUIDE switched rack pdu 23 URL addr ess formats T ype the DNS name or IP address of the Switched Rack PDU in the Web browser ’ s URL address field and press E NT ER . Except as noted below , http:// is automatically added by th e browser .
® ® ® ® USER ’ S GUIDE switched rack pdu 24 Summar y Page When you log on to the web interface at the Switched Rack PDU, the status view is displayed at the right side of the screen, the quick status tab is displayed at the uppe r right, and the n avigation menu is displaye d at the left.
® ® ® ® USER ’ S GUIDE switched rack pdu 25 Quick status tab The quick status tab is displayed at the upper rig ht on every page in the Web interface.
® ® ® ® USER ’ S GUIDE switched rack pdu 26 Navigation Menu Overview On the Web interface, the navi gation menu (left frame) has the followin g elements: • IP address of the PDU • Switched R.
® ® ® ® USER ’ S GUIDE switched rack pdu 27 Selecting a menu to perform a task • T o do the follo wing, see Switched Rack P DU Settings : – Configure the overload thresholds for ea ch phase .
® ® ® ® USER ’ S GUIDE switched rack pdu 28 – Define the system Name , Cont ac t , and Location values – Set the date and time used by the PDU – Restart the Switched Rack PDU – Reset con.
® ® ® ® USER ’ S GUIDE switched rack pdu 29 Links menu Provides three user-defi nable URL link op tions. By default, these lin ks access the following AP C Web p age s: • APC’ s Web Site accesses the A PC home page. • T estdrive Demo accesse s a demonstration page where you ca n use samples of APC web-en abled products.
® ® ® ® USER ’ S GUIDE switched rack pdu 30 Device Manager Menus Outlet Settings Contr ol outlets We b i n t e r f a c e . T o control the outlets on your Switched R ack PDU individually or as a group, select the check boxes next to the outlet numbers or the Apply to all Outle t s check box in the Outlet s menu.
® ® ® ® USER ’ S GUIDE switched rack pdu 31 Configur e outlet settings and outlet name We b I n t e r f a c e . T o co nfigure the outle t settings and outlet nam e: 1. Select the Configuration option of the Outlet s menu, and click the Configure button.
® ® ® ® USER ’ S GUIDE switched rack pdu 32 Control Console. T o con figure the outlet settings and outlet name: 1. Select Outlet Control/Con fig from the Device Manag er menu. 2. Choose the numb er of the o utlet you want to control, and press E NTER .
® ® ® ® USER ’ S GUIDE switched rack pdu 33 Switched Rack PDU Settings Configur e L oad Thr eshold s We b i n t e r f a c e . Se lect Switched Rack PDU from the navigation menu and and click the Config ure button in the Load Management section .
® ® ® ® USER ’ S GUIDE switched rack pdu 34 Over lo ad ou tle t restriction Prevent users from applying power to outlets d uring an overload condition. Y ou can set the following restrictions for each outlet: • None : Y ou can apply power to outlets reg ardless of an Overload Alarm or Near Overloa d W arning.
® ® ® ® USER ’ S GUIDE switched rack pdu 35 Configur e Device Settings We b i n t e r f a c e . Se lect Device Settings on t he Switched Rack PDU menu, click the Configure button and conf igure the Name and Loc ation fields for the PDU, and set the C oldst art D elay .
® ® ® ® USER ’ S GUIDE switched rack pdu 36 Event-Related Menus Intr od uction Overview The Events menu provides access to the options that you use to do the following tasks: • Access the even.
® ® ® ® USER ’ S GUIDE switched rack pdu 37 Menu options In the Web interface, all of the events options are a ccessed through the Event s menu. In the control con sole, access the available events-related options as follows: • Use the Ema il option in the Netw ork menu to define the SMTP server and e-mail recipients.
® ® ® ® USER ’ S GUIDE switched rack pdu 38 Event Log Overview The Switched Rack PDU supports event-logging for all embedded management card app lication firmware mo dules.
® ® ® ® USER ’ S GUIDE switched rack pdu 39 Logged events By default, any event which causes an SNM P trap will be logged, except for SNMP authent ication failures. Ad ditionally , the Switched Rack PDU will log its abnormal internal system events.
® ® ® ® USER ’ S GUIDE switched rack pdu 40 Control console Press C TRL -L to display up to 300 events from the eve nt log, in reverse chronological order . Use the S PA CE B AR to scroll th rough the recorded events. While viewing the log, type d and press E NTER t o clear all events from the log.
® ® ® ® USER ’ S GUIDE switched rack pdu 41 How to use F TP to r etrieve log files Y ou can use FTP to re trieve a tab-delineated event log ( event.txt ) file that you can import into a sp readsheet applic ation. • The file reports all of the events ( event.
® ® ® ® USER ’ S GUIDE switched rack pdu 42 an Administrator or a De vice Manager User . – For Administrator , apc is the def ault for User Nam e and Password . – For Device Manager , device is t he default for User Name , and apc is the default for Password .
® ® ® ® USER ’ S GUIDE switched rack pdu 43 Event Actions (W eb Interface Only) Overview The Actions option is a vailable only on the Web interface’s Event s menu.
® ® ® ® USER ’ S GUIDE switched rack pdu 44 Severity levels Except for some System (embedded management card) events that do not have a severity level,eve nts are assigned a default se verity level based on their seriousness.
® ® ® ® USER ’ S GUIDE switched rack pdu 45 Email action By default, the Email action is enabled for all events that have a sev erity level assigned. Howeve r , before you can use e-mail for event notif ications, you must define the e-m ail recipients.
® ® ® ® USER ’ S GUIDE switched rack pdu 46 Event Recipients Overview The Web interface and control c onsole both have option s that allow you to define up to four trap receivers and up to four e-mail addresses to be used when an event occurs that has the SNM P traps or e-mail enabled.
® ® ® ® USER ’ S GUIDE switched rack pdu 47 E-mail Featur e Overview Y ou can use the Simple Mail Transfer Protocol (SMTP) to send e-mail to up to four recipients when an event occ urs.
® ® ® ® USER ’ S GUIDE switched rack pdu 48 DNS servers The Switched Rack PDU cannot send an y e-mail messages unless t he IP address of the primary DNS server is define d (see DNS serve rs ). The Switched Rack PDU will wa it a maximum of 15 seconds for a response from the primary or (if specified) the secondary DNS server .
® ® ® ® USER ’ S GUIDE switched rack pdu 49 Email Recipients In the Web interface, the Recip ient s option of t he Events menu or the Configure the Email rec ipient s lin k in the “Email Configuratio n” page accesses the settings y ou use to identif y up to four e-mail recipien t s.
® ® ® ® USER ’ S GUIDE switched rack pdu 50 Setti ng Descript ion e Generation Enables (by default) or disables sending e- mail to the recipient. Format Selects the f ormat used for e-mail messages: Short : Identifies onl y the event that occurred.
® ® ® ® USER ’ S GUIDE switched rack pdu 51 How to Configur e Individual Events Event List page The Actions option in th e Events menu opens the “Event Action Configuration” page on the Web interface. Use the Details bu tton in this page to access a complete list of th e events that can be reported by you r Switched Rack PDU.
® ® ® ® USER ’ S GUIDE switched rack pdu 52 System Menu Intr od uction Overview Use the System menu to do the followin g t a sks: • Configure system identif ication, date and time settings, an.
® ® ® ® USER ’ S GUIDE switched rack pdu 53 Menu options Unless noted, the follow ing menu option s are available in the con trol console and Web interface: • User Manager • Outlet Manager .
® ® ® ® USER ’ S GUIDE switched rack pdu 54 Option Settings User Manager Use this option to defin e the access valu es shared by the control console and the Web interface, and th e authentication used to access the Web interface.
® ® ® ® USER ’ S GUIDE switched rack pdu 55 Outlet Manager Use the Outlet User Manager option to set up user accou nt s that have access only to certain outlets . We b i n t e r f a c e . Choose a user name, or choos e Add New User t o edit accounts.
® ® ® ® USER ’ S GUIDE switched rack pdu 56 Identifica tion Use this option to def ine the System Name , Cont act , and Location values used by the SNMP a gent for the S witched Rack PDU. The option’s settings provide the values use d for the MIB-II sysName , sysCont act , and sysLocation Object Ide ntifications (OIDs).
® ® ® ® USER ’ S GUIDE switched rack pdu 57 Set Manually . Use this option in the Web interface, or Manual in the control console, to set Date and Ti m e fo r the Switched Rack PDU.
® ® ® ® USER ’ S GUIDE switched rack pdu 58 Synchr onize with Netw ork T ime Pr ot ocol (NTP) Server . Use this option on the web inte rface, or Network T ime Pr otocol (NTP) on th e control console, to hav e an NTP Server a utomatically update the Date and Tim e settings for the S witched Rack PDU.
® ® ® ® USER ’ S GUIDE switched rack pdu 59 Links (W eb interface) Use this option to modif y the links to APC W eb pages. . Reset to Defaults Resets all configuration settings. This option will reset t he TCP/IP settings and en able DHCP an d BOOTP .
® ® ® ® USER ’ S GUIDE switched rack pdu 60 About System This option identifies th e following hardware inform ation for the Swit ched Rack PDU: Model Number , Serial Number , Hardwa re Revision , Manufacture Date , and MAC Address . This screen also displays the Name , Ve r s i o n , Date , and Tim e for the Application Module and AOS.
® ® ® ® USER ’ S GUIDE switched rack pdu 61 Network Menu Intr od uction Overview Use the Network menu to do the following tasks: • Define TCP/IP settings, including BOOTP server settings, when.
® ® ® ® USER ’ S GUIDE switched rack pdu 62 Option Settings TCP/IP Use this option to en able or disable BOOTP , and when B OOTP is disable d, to define the three TCP /IP settings that the Switched Rack PDU n eeds to operate on the networ k.
® ® ® ® USER ’ S GUIDE switched rack pdu 63 Curr ent TCP/IP settings fields. The current values for S ystem IP , Subnet Mask , D efault Gateway , the MAC Address, Host Name, and the Domain Name f or the Switched R ack PDU are displayed with the TCP/IP settings in the control c onsole and Web interface.
® ® ® ® USER ’ S GUIDE switched rack pdu 64 DNS Configur e Domain Name Service Setting s fields. Use these fields to define the IP addresse s of the primary and seco ndary Domain Nam e Servers (DNS) us ed by the Switched Rack PDU e-mail feature.
® ® ® ® USER ’ S GUIDE switched rack pdu 65 Ping utility (contr ol console) Select this option, avai lable only in the c ontrol console, to check t he network connection by testing whether a defined IP address resp onds to the Ping network utility .
® ® ® ® USER ’ S GUIDE switched rack pdu 66 F TP Ser ver , and T elnet & W eb options Each of these options has a setting wh ich enables (by default) o r disables Access , and a Port setting that identifi es the TCP/IP port used f or communications with the Sw itched Rack PDU.
® ® ® ® USER ’ S GUIDE switched rack pdu 67 SNMP An Access option (the Settings option in the control console) en ables (by default) or disables SNM P . When SNMP is enabled, the Access Co ntrol settings allow you to control how each of the four available SNMP channels is used.
® ® ® ® USER ’ S GUIDE switched rack pdu 68 Email Use this option to defin e two SMTP settin gs ( SMTP Server and Fro m Address ) used by the e -mail feature of the Switch ed Rack PDU.
® ® ® ® USER ’ S GUIDE switched rack pdu 69 Boot Mode Intr od uction Overview In addition to using a BOOTP server or manual settings, the Sw itched Rack PDU can use a dynamic host configuratio n protocol (DHCP) server to provide the settings tha t it needs to op erate on a TCP/IP networ k.
® ® ® ® USER ’ S GUIDE switched rack pdu 70 DHCP & BOOTP boo t pr ocess When Boot mode is set to its default DHCP & BO OTP setting, the following occurs when th e Switched Rack PDU is started or reset: 1. The Switched Rack PDU makes up to five requests for it s ne twork assignment from any BO OTP server .
® ® ® ® USER ’ S GUIDE switched rack pdu 71 DHCP Configuration Settings Switched Rack PDU sett ings The TCP/IP option in th e Network menu of the Web inter face and control console accesses the n etwork settings for the Sw itched Rack PDU .
® ® ® ® USER ’ S GUIDE switched rack pdu 72 When Boot mode is set to DHCP Only , two options are available: • DHCP Cookie Is in the c ontrol console (or Require vendor specific cookie to accept DHCP Address in the Web interface): By default, this option requires tha t the DHCP respon ses include the APC coo kie in order to be valid.
® ® ® ® USER ’ S GUIDE switched rack pdu 73 DHCP r esponse option s Each valid DHCP respon se contains options that prov ide the TCP/IP settings that the Switch ed Rack PDU nee ds to operate on a netw ork, and other information that a ffect s the o peration of the PDU.
® ® ® ® USER ’ S GUIDE switched rack pdu 74 Boot Mode T rans ition. T a g 2, Len 1, Data 1/2 This option 43 setting e nables or disable s the Af t er IP Assignment option which, by default, caus.
® ® ® ® USER ’ S GUIDE switched rack pdu 75 TCP/IP opti ons. The Swit ched Rack PDU uses the following options within a valid DHCP respo nse to define its TCP/IP settings: • IP Address (from the yi addr field of the D HCP response): Provides the IP address that th e DHCP server is le asing to the PDU.
® ® ® ® USER ’ S GUIDE switched rack pdu 76 Security Security Featur es Planning and implementing secur i ty featur es As a network device tha t passes information across the networ k, the Switched Rack PDU is su bject to the same exposure as other device s on the network.
® ® ® ® USER ’ S GUIDE switched rack pdu 77 Summary of access methods Interface Security Access Notes Serial Control Console Access is by user name and password.
® ® ® ® USER ’ S GUIDE switched rack pdu 78 Interface Security Access Notes Authentic ation Authentication ver sus encryption Y ou can select to use security features for the Switched Rack PDU that control access by provid ing basic authen tication through user nam es, passwords, and IP addresses, with out using encryption.
® ® ® ® USER ’ S GUIDE switched rack pdu 79.
® ® ® ® USER ’ S GUIDE switched rack pdu 80 Pr oduct Information W a rranty and Serv ice Limited warranty APC w arrants the Switched Rack PDU to be fre e from defects in materials and workmanship for a p eriod of two yea rs from the date of purcha se.
® ® ® ® USER ’ S GUIDE switched rack pdu 81 W arranty limitations Except as provided he rein, APC makes no warranties, express or implied, including warra nties of merchan t ability and fitnes s for a p articu lar purpose.
® ® ® ® USER ’ S GUIDE switched rack pdu 82 daytime phone numbe r; a copy of the s ales receipt; and a check as payment, if applicable. 5. Mark the RMA number cle arly on the outside of the shipping ca rton. 6. Ship by insured, prepaid carrier to th e address provide d by the Customer Support techn ician.
® ® ® ® USER ’ S GUIDE switched rack pdu 83 Life-Support Po licy General policy American Power Convers ion ( APC ) does not recommend the use of any of its products in the following situations: .
® ® ® ® USER ’ S GUIDE switched rack pdu 84 Index A About S ystem 28 Access limiting NMS SNMP access by IP address 67 Access Type setting 67 Actions 43 Advanc ed setti ngs Client ID 71 Domain Na.
® ® ® ® USER ’ S GUIDE switched rack pdu 85 Domain Name setti ng 71 E E-mail configur ing 47 enabled by default for severe even ts 45 enabling and disa bling 50 Events menu option 4 5 , 49 messa.
® ® ® ® USER ’ S GUIDE switched rack pdu 86 Web interf ace 24 M Main screen displayi ng identifi cation 15 firmware values di splayed 15 login date and time 16 status 1 7 Up Time 16 User access .
® ® ® ® USER ’ S GUIDE switched rack pdu 87 Tools 58 User Manager 54 T TCP/IP Client ID s etting 71 Current s ettings fields 63 Domain Name set ting 71 Host Name set ting 71 Port Speed setting 7.
® ® ® ® USER ’ S GUIDE switched rack pdu APC W orldwide Customer Support Customer support for th is or any other AP C product is available at n o charge in any of the fo llowing ways: • Visit .
® ® ® ® USER ’ S GUIDE switched rack pdu Copyright Entire contents copyright © 2003 Americ an Power Convers ion. All rights reserved. Reproduct ion in whole or in part without perm ission is prohibited. APC and the APC logo are trademarks of America n Power Conversio n Corporation and may be registered in som e jurisdictions.
An important point after buying a device APC Switched Rack Power Distribution Unit (PDU) (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought APC Switched Rack Power Distribution Unit (PDU) 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 APC Switched Rack Power Distribution Unit (PDU) - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, APC Switched Rack Power Distribution Unit (PDU) you will learn all the available features of the product, as well as information on its operation. The information that you get APC Switched Rack Power Distribution Unit (PDU) will certainly help you make a decision on the purchase.
If you already are a holder of APC Switched Rack Power Distribution Unit (PDU), 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 APC Switched Rack Power Distribution Unit (PDU).
However, one of the most important roles played by the user manual is to help in solving problems with APC Switched Rack Power Distribution Unit (PDU). Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device APC Switched Rack Power Distribution Unit (PDU) 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
