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Troubleshooting

4-2

8800-A2-GN21-20

October 1997

Additional Troubleshooting Procedures

Symptom

Solutions

SYSTEM ALM LED is ON
and DSL card is inoperative
in Slot

1. Using the HotWire DSLAM software, choose Card

Selection from the Main Menu to display the status of
each DSL card.

2. If a major alarm is indicated, go to the MCC card and

do a card reset.

– Use HotWire DSLAM software to reset the DSL

card.

– Go to Configuration/ DSL/Cards/Reset_Slot.

– Refer to the

HotWire DSLAM Configuration for

Models 8540 and 8546 User’s Guide for more
information.

3. Remove and reinstall the card.

4. If unable to clear by resetting the card, you may need

to replace the card.

DSL cards are not working
properly

1. Make sure the path to the LAN/WAN hub and DSL

ports is OK.

2. Check cables to the hub and DSL ports and make sure

connection is made properly.

3. Try removing the DSL card from the slot and

reinstalling the card in another slot.

4. Replace the DSL card.

FAN Alarm is ON

1. Remove power.

2. Remove the fan module from the chassis.

3. Inspect the fan module, and replace if necessary.

4. Contact your service representative for assistance.

Содержание HotWire 8800

Страница 1: ...HOTWIRE 8800 DIGITAL SUBSCRIBER LINE ACCESS MULTIPLEXER DSLAM INSTALLATION GUIDE Document No 8800 A2 GN21 20 October 1997 ...

Страница 2: ...rves the right to revise this publication and to make changes from time to time in the contents hereof without obligation of Paradyne Corporation to notify any person of such revision or changes Changes and enhancements to the product and to the information herein will be documented and issued as a new release to this manual Warranty Sales and Service Information Contact your sales or service repr...

Страница 3: ...V supply source that is electrically isolated from the ac source The 48 Vdc source is to be reliably connected to earth Connect the earthing grounding wire to the protective earthing grounding lug connector identified by the protective earth symbol 8 A readily accessible disconnect device as part of the building installation shall be incorporated in fixed wiring The disconnect device a 48 Vdc 15 o...

Страница 4: ...operational and safety requirements as prescribed in the appropriate Terminal Equipment Technical Requirements document s The Department does not guarantee the equipment will operate to the user s satisfaction Before installing this equipment users should ensure that it is permissible to be connected to the facilities of the local telecommunications company The equipment must also be installed usi...

Страница 5: ...in certain voltage limits as amended by Directive 93 68EEC Directive 89 336 EEC Council Directive of 3 May 1989 on the approximation of the laws of the member states relating to Electro Magnetic Compatibility EMC as amended by Directive 93 68 EEC Japan Class 1 ITE This is a Class 1 product based on the standard of the Voluntary Control Council for interference by Information Technology Equipment V...

Страница 6: ...nstalling and Connecting the Hardware Overview 2 1 Package Contents 2 1 Unpacking the Hardware 2 3 Pre installation Considerations 2 3 Installation Tasks 2 4 Chassis Installation 2 5 Installation into a 19 Inch Rack 2 6 Installation into a 23 Inch Rack 2 7 Installing the Chassis Set Back 3 or 5 Inches 2 9 Installation into a Rack without Threaded Screw Holes 2 10 High Density Back to Back Installa...

Страница 7: ...dem for Remote Management 2 25 3 Initial Setup Instructions Setting the IP Address and Subnet Mask on the MCC for Remote Configuration 3 1 4 Troubleshooting Power Failure Troubleshooting Procedures 4 1 Additional Troubleshooting Procedures 4 2 A LEDs Overview A 1 HotWire 8800 DSL Access System Chassis A 1 MCC Card A 3 B Pinouts 8 Pin Modular LAN WAN Connector and Management 10BaseT Connector Pinou...

Страница 8: ...d technicians who install devices at the Central Office It should be used in conjunction with the HotWire DSLAM for 8540 and 8546 DSL Cards Network Configuration Guide which describes how to plan the data networks surrounding the DSLAM and with the HotWire DSLAM for 8540 and 8546 DSL Cards User s Guide which describes how to configure and operate the DSLAM DSL and MCC cards The chassis requires on...

Страница 9: ...ructions Describes how to assign an IP address to the MCC card to allow for remote configuration Chapter 4 Troubleshooting Describes troubleshooting procedures for common problems Appendix A LEDs Describes the meaning of the LEDs on the chassis the MCC card and DSL cards Appendix B Pinouts Provides the pin assignments for the connectors on the Interface Panel Appendix C Technical Specifications Pr...

Страница 10: ... A2 GB20 HotWire DSLAM for 8540 and 8546 DSL Cards User s Guide 8000 A2 GB21 HotWire DSLAM for 8540 and 8546 DSL Cards Network Configuration Guide 8000 A2 GB24 HotWire DSLAM Configuration for 8540 and 8546 DSL Cards Startup Guide 8000 A2 GB90 HotWire 8100 8200 Internetworking Packet Concentrator IPC User s Guide 8000 A2 GN11 HotWire Management Communications Controller MCC Card Installation Instru...

Страница 11: ...al Subscriber Line DSL technology the DSLAM provides simultaneous high speed data access digital and POTS service analog over the same twisted pair telephone line Support of this simultaneous access requires the installation of POTS splitters at both ends of the line i e at the CO and at the customer premises CP When used in combination with a HotWire 8200 Interworking Packet Concentrator IPC the ...

Страница 12: ...acket Concentrator Optional DSL CARD DSLAM Central Office CO 97 15674 01 Customer Premises CP CO Switch Ethernet RTU CP POTS Splitter CO POTS Splitter MDF POTS DSL HotWire 8200 IPC Voice Interface Data Interface POTS Network Service Provider The HotWire 8800 DSLAM can be configured to operate with multiple types of Remote Termination Units RTU installed at the customer end of the telephone loop to...

Страница 13: ...s operational status for each of the DSL cards and responds to the SNMP requests It also has a serial port for local terminal access At least one Digital Subscriber Line DSL card The chassis requires at least one DSL card which is a circuit card that contains four DSL ports an Ethernet interface to the NSP and a processor The processor controls the modems and forwards the packet traffic to and fro...

Страница 14: ...in the front of the chassis for easy accessibility Major Minor Alarm Contacts for CO Alarm Requirements The interface panel provides two sets of dry contacts on a 6 pin jack interface for connection to a Central Office CO alarm system LED Monitors for Power and Fan Status and Major and Minor Alarms LEDs on the front panel of the HotWire 8800 chassis are indicators of the status of chassis function...

Страница 15: ...examples of chassis mounting configurations Four chassis in a rack Two chassis and two six slot POTS splitters in a rack and Four chassis and four six slot POTS splitters in adjacent racks NOTE In this guide the term rack refers to a CO rack cabinet frame or bay 97 15281 01 ALARMS Major Minor Fan B A POWER A B ALARMS Major Minor Fan B A POWER A B ALARMS Major Minor Fan B A POWER A B ALARMS Major M...

Страница 16: ...ARMS Major Minor Fan B A POWER A B Four HotWire 8800 DSLAMS and Four Six Slot POTs Splitter in Adjacent Racks The 8800 chassis can be mounted in a back to back configuration up to 8 chassis in a 7 foot rack to provide up to 576 DSL ports requiring no more than a 24 inch depth 97 15340 For more information about mounting configurations see Chapter 2 Installing and Connecting the Hardware ...

Страница 17: ...lling the MCC card and DSL card s into the chassis Connecting to a POTS splitter shelf or Main Distributing Frame MDF Connecting to the CO alarm system Connecting to the Ethernet hubs or switches Connecting to a console terminal laptop computer or modem NOTE The term rack refers to a CO rack cabinet frame or bay Package Contents The HotWire 8800 DSLAM chassis consists of the following components a...

Страница 18: ...Alm Test ETHERNET TX RX Coll DSL PORT 1 2 3 4 In addition each chassis is shipped with the following Associated hardware bundled in a plastic bag Three cable ties Three shorter 50 pin Telco connector captive screws to replace longer Telco captive screws Four 10 32 mounting screws Four 12 24 mounting screws and four 12 24 speed nuts for use with racks without threaded mounting holes Air filter whic...

Страница 19: ...can be either solid or stranded However the preferred power source wire type is 14 AWG stranded Grounding A copper lug connector is attached to the chassis grounding post It can accept a bare wire 6 through 14 AWG Cabling The following customer provided cables and cable adapters are required with this product Telco 50 pin cable for connection to the CO POTS splitter shelf or MDF You will need one ...

Страница 20: ...s Supplying Power page 2 13 3 Install the MCC card into the chassis Slot 19 Installing the MCC Card page 2 15 4 Install DSL cards into the chassis Slot 1 18 Installing DSL Cards page 2 17 5 Verify the hardware installation Verifying the Installation page 2 18 6 Connect the chassis to a POTS splitter shelf MDF or other demarcation point Connecting to a POTS Splitter or an MDF page 2 19 7 Optional C...

Страница 21: ...alled in a 19 inch wide rack For both the 19 and 23 inch wide rack the chassis can be installed in one of three depth positions front flush mount 3 inch setback or 5 inch setback as illustrated below 19 Inch Rack Installation 97 15282 01 23 Inch Rack Installation 5 00 3 00 5 00 3 00 Flush Mount The rack that the chassis will be installed in may or may not have threaded screw holes This section pro...

Страница 22: ...e recommended procedure to install the chassis starting at the bottom of the rack Front Rail Keyhole 97 15324 a Front of 19 inch Rack Screw 2 Place the chassis against the front rails of the rack allowing the installed machine screws to pass through the keyholes Lower the chassis into place allowing the keyholes to slide under the screw heads This action positions the chassis correctly for install...

Страница 23: ...rotate it and place it on the right side so that the longer side extends out Do the same for the bracket from the right side of the chassis Replace the screws 2 Determine the preferred placement of the chassis in the rack The chassis is 19 25 inches high and the keyhole slots are located approximately 4 inches from the bottom of the chassis Then mark the appropriate locations for the two lower mac...

Страница 24: ... slide under the screw heads This action positions the chassis correctly for installation of the two remaining machine screws and helps support its weight during installation of these screws 4 Install the two remaining machine screws at the top corners of the chassis and tighten all four To install the next chassis in the same manner follow Steps 1 through 4 For a standard rack installation the ch...

Страница 25: ...h the bracket on the left side for flush mounting A third screw necessary for set back mounting is already installed behind the left bracket near the top of the chassis Remove this screw and save it 97 15701 Third Screw for Set Back Installation 2 Position the brackets set back 3 or 5 inches from flush mount Refer to procedures for reversing brackets if installing in a 23 inch rack 3 Use three scr...

Страница 26: ... chassis for a 19 inch rack NOTE It is the recommended procedure to install the chassis starting at the bottom of the rack 2 Slip a speed nut onto each rail hole selected and align the hole of the speed nut with the hole in the rail Front Rail Keyhole 97 15324 Front of 19 inch Rack Screw Speed Nut 3 Line up the chassis mounting bracket with the speed nut and start to rotate the speed nut screw int...

Страница 27: ... chassis in the back of the rack Also keep in mind that you must Reposition the top cover air flow vents for each chassis before installing the chassis into the rack To do this disassemble and reverse the rear baffle plate on the top and reposition it with the air vents facing upward 97 15424 01 Air Flow Vents Leave at least 1 75 inches between a chassis and the one above it 3 5 inches preferred F...

Страница 28: ...pect and or replace the air filter periodically To purchase a replacement air filter contact your sales representative Procedure To install the optional air filter 1 Unfasten the screws on the cover plate and remove it 2 Slide the air filter into the air filter channel guides 97 15425 ALARMS Major Minor Fan B A POWER MGT SERIAL MGT 10BT ALARM SLOTS 1 6 SLOTS 7 12 SLOTS 13 18 LINES A B 48V A 48V IN...

Страница 29: ...t powered i e the circuit breakers are open or fuses are removed Verify that the tips of the power source wires 10 AWG through 16 AWG solid or stranded wire are stripped of insulation If they are not already stripped of insulation strip the tip of each wire about 1 3 inch in length before plugging each wire into its appropriate terminal on the 48V input terminal block 1 Insert the following wires ...

Страница 30: ...ND 2 4 6 8 10 12 14 16 18 19 1 3 5 7 9 11 13 15 17 LAN WAN SLOT 20 LAN WAN SLOT 97 15326 48V A 48V B RET A RET B FR GND 48V INPUT Second Return Input 3 Provide power to the chassis by closing the circuit breakers or reinstalling the fuses 4 If you are using a single power input make the sure the LED associated with the Power Source A input terminal is lit If you are using two power input feeds mak...

Страница 31: ... damage due to electrostatic discharge ESD during normal operation When performing installation procedures however take proper static control precautions to prevent damage to equipment If you are not sure of the proper static control precautions contact your nearest sales or service representative Procedure To install the MCC card 1 Open the front door of the chassis 2 Hold the MCC card vertically...

Страница 32: ... faceplate is ON winking green 5 Secure the MCC card by fastening the top and bottom screws on the faceplate NOTE The MCC card may be replaced without disruption to user data i e you can remove and re install the MCC card without powering down the chassis and disrupting service to the other cards To remove the MCC card from the chassis unfasten the screws on the top and bottom of the faceplate The...

Страница 33: ...damage due to electrostatic discharge ESD during normal operation When performing installation procedures however take proper static control precautions to prevent damage to equipment If you are not sure of the proper static control precautions contact your nearest sales or service representative Procedure To install a DSL card 1 Make sure the front door of the chassis is open 2 Hold the DSL card ...

Страница 34: ... card from the chassis unfasten the screws on the top and bottom of the faceplate Then simply push the ejector handles outward and slide the card out When swapping the old DSL card with a new DSL card it is important to note that the HotWire 8800 DSLAM retains the Media Access Control MAC address also referred to as the physical address This means that the new DSL card will have the same MAC addre...

Страница 35: ...ble CAT3 For multiple DSL circuits in the same main bundle choose non adjacent wire pairs whenever possible Use only non conditioned loops no load coils echo suppression etc Eliminate any non twisted cable from the loop Always keep TIP and RING in the same twisted cable pair Connecting to a POTS Splitter or an MDF Follow this procedure to connect the HotWire 8800 DSLAM to a loop distribution point...

Страница 36: ...shorter connector captive screw which is provided with the product 3 Insert a cable tie provided with product through the anchor mount to hold the Telco 50 pin connector in place If more than one cable is being connected replace the existing cable tie with a single tie to span the two or three Telco connectors 4 Make sure the other end is connected to the appropriate POTS splitter shelf typically ...

Страница 37: ...the ALARM port of the chassis 2 Dress the cable to the right and through the cable retainer MGT SERIAL MGT 10BT ALARM SLOTS 1 6 SLOTS 7 12 SLOTS 13 18 LINES A B 48V A 48V INPUT 48V B RET A RET B 2 4 6 8 10 12 14 16 18 19 1 3 5 7 9 11 13 15 17 LAN WAN SLOT 20 LAN WAN SLOT MGT SERIAL MGT 10BT ALARM 2 4 6 8 10 12 14 16 18 19 1 3 5 7 9 11 13 15 17 LAN WAN SLOT 20 LAN WAN SLOT Alarm 97 15331 01 3 Remov...

Страница 38: ...AN WAN SLOT port 1 2 Dress the cable to the right and through the cable retainer MGT SERIAL MGT 10BT ALARM SLOTS 1 6 SLOTS 7 12 SLOTS 13 18 LINES A B 48V A 48V INPUT 48V B RET A RET B FR GND 2 4 6 8 10 12 14 16 18 19 1 3 5 7 9 11 13 15 17 LAN WAN SLOT 20 LAN WAN SLOT MGT SERIAL MGT 10BT ALARM 2 4 6 8 10 12 14 16 18 19 1 3 5 7 9 11 13 15 17 LAN WAN SLOT 20 LAN WAN SLOT LAN WAN SLOT PORT 1 97 15385 ...

Страница 39: ...s 2 Dress the cable to the right and through the cable retainer MGT SERIAL MGT 10BT ALARM SLOTS 1 6 SLOTS 7 12 SLOTS 13 18 LINES A B 48V A 48V INPUT 48V B RET A RET B FR GND 2 4 6 8 10 12 14 16 18 19 1 3 5 7 9 11 13 15 17 LAN WAN SLOT 20 LAN WAN SLOT MGT SERIAL MGT 10BT ALARM 2 4 6 8 10 12 14 16 18 19 1 3 5 7 9 11 13 15 17 LAN WAN SLOT 20 LAN WAN SLOT MGT 10BaseT 97 15332 02 3 Plug the other end o...

Страница 40: ... A B 48V A 48V INPUT 48V B RET A RET B 2 4 6 8 10 12 14 16 18 19 1 3 5 7 9 11 13 15 17 LAN WAN SLOT 20 LAN WAN SLOT MGT SERIAL MGT 10BT ALARM 2 4 6 8 10 12 14 16 18 19 1 3 5 7 9 11 13 15 17 LAN WAN SLOT 20 LAN WAN SLOT Management Serial 97 15333 01 3 Plug the other end of the cable into your terminal s or laptop computer s serial port using the DB25 RS 232 male adapter Use a female DB9 to male DB2...

Страница 41: ...mple ATQ2 H Set the modem to ignore Data Terminal Ready DTR For example AT D0 Procedure To connect the HotWire 8800 DSLAM to a dial up modem 1 Plug a serial cable into the MGT SERIAL port of the chassis 2 Dress the cable to the right and through the cable retainer 3 Plug the other end of the cable into your modem s serial port using a DB25 adapter and a Null Modem Refer to Appendix B Pinouts for p...

Страница 42: ...remote card configuration from a network management workstation by means of a telnet session you must set the IP address and subnet mask of the MCC card using the local terminal at the CO before you can configure the cards remotely This section describes how to set the IP address and subnet mask of the MCC card Refer to the HotWire DSLAM for 8540 and 8546 DSL Cards User s Guide for detailed inform...

Страница 43: ...est completes The Who Am I screen will appear 2 From the Who Am I screen enter the Management Domain IP address of the MCC card and press the Return key For example if the IP address of the MCC card is 198 152 110 1 type this value at the nnn nnn nnn nnn prompt at the bottom of the screen The system automatically calculates the subnet mask based on the IP address you enter ...

Страница 44: ...nter a new subnet mask and press Return The system highlights the OK to restart prompt 4 Type y at the yes no prompt to restart the card or n to decline the restart If you type y the card restarts You can now log in remotely using telnet or an SNMP network management system to configure the cards Refer to the HotWire DSLAM for 8540 and 8546 DSL Cards User s Guide for detailed instructions ...

Страница 45: ...ing illustrates the steps to take when either the Power A or Power B LEDs or both are OFF 1 Using a voltmeter check for power at the terminal connections If there is power call your sales representative for service to the 8800 DSLAM 2 If there is no power at the terminal call the appropriate electrician ...

Страница 46: ... HotWire DSLAM Configuration for Models 8540 and 8546 User s Guide for more information 3 Remove and reinstall the card 4 If unable to clear by resetting the card you may need to replace the card DSL cards are not working properly 1 Make sure the path to the LAN WAN hub and DSL ports is OK 2 Check cables to the hub and DSL ports and make sure connection is made properly 3 Try removing the DSL card...

Страница 47: ...tWire 8800 DSLAM chassis and card HotWire 8800 DSL Access System Chassis The chassis allows addressable diagnostic connectivity between the MCC and each of the DSL cards It also converts and distributes 48V power to the cards in the chassis In addition it provides fans to cool the circuit cards in the rack ...

Страница 48: ...e B Low or no voltage for Power Source B Fan System Alarm Yellow Off Fan failure or a single fan in the Fan Module is working at less than 50 of its normal output Normal operation or no power to mounting Major Alarm Yellow Off Major alarm present in the chassis controlled by the MCC The card with alarm conditions will also have its Alarm LED lit No major alarms Minor Alarm Yellow Off Minor alarm p...

Страница 49: ...mote Termination Units RTUs The following table describes the meaning and states of the LEDs on the MCC card faceplate Type LED LED is Indicating SYSTEM OK Green Winking Off Normal operation card functioning normally No power to card or card failure Alrm Amber Off Alarm present on MCC Normal operation no alarms Test Amber Off Test in progress Normal operation no tests ETHERNET TX Green Blinking Of...

Страница 50: ...gement 10BaseT Connector Pinouts The 8 pin interface for the LAN WAN 10BaseT connection has the following pin assignments The 8 pin interface is also used for the Management 10BaseT connection to a diagnostic IP network Pin Number Use 1 TX Data 2 TX Data 3 RX Data 4 Reserved 5 Reserved 6 RX Data 7 Reserved 8 Reserved ...

Страница 51: ...Reserved 4 Signal Ground 5 Receive Data 6 Transmit Data 7 Reserved 8 Reserved 6 Pin Modular Alarm Connector Pinouts The Alarm connector consists of two sets of dry contact closures on a 6 pin jack The Alarm leads report major and minor alarms to a CO alarm system The following lists the pin assignments for the 6 pin jack Pin Number Use 1 Closed on Major Alarm Normally Open 2 Common 3 Open on Major...

Страница 52: ... 4 29 Card 2 Port 1 Card 8 Port 1 Card 14 Port 1 5 30 Card 2 Port 2 Card 8 Port 2 Card 14 Port 2 6 31 Card 2 Port 3 Card 8 Port 3 Card 14 Port 3 7 32 Card 2 Port 4 Card 8 Port 4 Card 14 Port 4 8 33 Card 3 Port 1 Card 9 Port 1 Card 15 Port 1 9 34 Card 3 Port 2 Card 9 Port 2 Card 15 Port 2 10 35 Card 3 Port 3 Card 9 Port 3 Card 15 Port 3 11 36 Card 3 Port 4 Card 9 Port 4 Card 15 Port 4 12 37 Card 4 ...

Страница 53: ...interface to a standard RS 232 DB25 interface which can then be connected to a terminal or laptop computer The following lists the pin assignments for the DB25 adapter 8 Pin Modular Serial Interface Pin Number Use DB25 Interface Pin Number 1 Unused 2 Unused 3 Unused 4 Signal Ground 7 5 Receive Data 3 6 Transmit Data 2 7 unused 8 unused ...

Страница 54: ...sing this back to back mounting configuration Interfaces 48V Power two pairs of screw terminals for A and B inputs 20 8 pin modular jacks for 10BaseT LAN WAN connection Three 50 pin Telco connectors for DSL Loop interfaces One Management 10BaseT and one Management Serial interface for the MCC card Local CO alarm system major and minor alarms two pairs of dry contact closures via a 6 pin modular ja...

Страница 55: ...e 4 Level Cooling and Air Handling Each 8800 DSLAM is cooled by its integral plug in fan module assembly Each chassis is independently cooled in a stack it does not rely on vertical air flow in a frame Operating Environment Ambient Temperature 32 to 122 F 0 to 50 C Relative Humidity 5 to 95 non condensing Storage Temperature 4 F 20 C to 158 F 70 C Shock and vibration sufficient to withstand normal...

Страница 56: ...P standard protocol that defines the IP as a unit of information passed across an Internet and provides the basis for packet delivery service IP includes the ICMP control and error message protocol as an integral part The entire protocol suite is often referred to as TCP IP because TCP and IP are the two most fundamental protocols Internet Protocol Address A 32 bit address assigned to a host on a ...

Страница 57: ...ring initialization and optimizes the data rates for each modem port in the chassis Remote Termination Unit A DSL device that is installed at the customer premise This device works with the HotWire 8800 DSLAM to provide lightning speed Internet or corporate LAN access Simple Network Management Protocol The rate at which data flows from the Remote Termination Units RTUs to the central office platfo...

Страница 58: ...r 2 24 to an MDF 2 19 to an SNMP management system 2 23 to Ethernet hubs or switches 2 22 connectors CO alarm B 2 DB25 adapter B 4 LAN WAN B 1 management 10BaseT B 1 management serial B 2 Telco 50 pin for DSL loops and POTS splitters B 3 D document purpose iii DSL card 1 3 installing the card 2 17 removing the card 2 18 E Ethernet hub switch connection 2 22 F filler plates 2 15 2 17 G Grounding 2 ...

Страница 59: ...ithout threaded screw holes 2 10 Interfaces C 1 L LEDs on the 8800 chassis A 1 on the MCC card A 3 load sharing 1 4 M Main Distributing Frame MDF 2 19 making cable connections 2 19 Management Communications Controller MCC card 1 3 installing the card 2 15 removing the card 2 16 setting the IP address 3 1 setting the subnet mask 3 1 Media Access Control MAC address 2 16 2 18 modem connection 2 25 m...

Страница 60: ...emote Termination Unit RTU 1 2 removing card DSL card 2 18 MCC card 2 16 S set back installation 2 5 2 9 setting the IP address on the MCC card 3 1 setup instructions 3 1 summary of installation tasks 2 4 supplying power 2 13 T technical specifications C 1 terminal or computer connection 2 24 troubleshooting procedures 4 1 U unpacking the hardware 2 3 V verifying the installation 2 18 ...

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