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31

CHAPTER 5: Operation

• ER: Blinks ON/OFF after a 511/511E test has timed out. See 

Section 5.2.4

for

more information.

Flashes once to indicate that a CRC error has occurred (during normal
operation) or bit errors have occurred (during 511/511E test).

Only at power up, blinks once every 200 ms if the DTE rate is set to an
unsupported setting.

• TM: Glows yellow to indicate that the mDSL Rack Card has been placed in test

mode. The unit can be placed in test mode by the local user or by the remote
user. The TM LED will flash for 400 msec when a valid packet is received from
the SNMP Management Module.

• NS: (No Signal) glows red to indicate that the local mDSL Rack Card is not

connected with the remote mDSL Rack Card. The TM LED will flash for 400
msec when a valid packet is received from the SNMP Management Module.

5.2 Test Modes

The mDSL Rack Card offers two proprietary loopback test modes, plus a built-in
V.52 BER test-pattern generator to evaluate the condition of the modems and the
communication link. These tests can be activated physically from the front panel or
via the interface.

5.2.1 O

VERVIEW

Figure 5-2 shows the major elements used in the loopback and pattern tests
available in the mDSL Rack Card. Each block has several functions. Following
Figure 5-2 are descriptions that show how the elements are used during test modes.

Figure 5-2. Major elements used in the loopback and pattern tests.

Framer

Processor

Processor

Framer

Pattern

Gen./Det.

Pattern

Gen./Det.

Loop

Control

Loop

Control

Line

Содержание ME0004C-10BT

Страница 1: ... a day 7 days a week Call 724 746 5500 or fax 724 746 0746 Mailing address Black Box Corporation 1000 Park Drive Lawrence PA 15055 1018 Web site www blackbox com E mail info blackbox com NOVEMBER 2001 ME0004C 10BT ME0004C G703 ME0004C RS530 ME0004C V24 ME0004C V35 ME0004C X21 High Speed 2 Wire Short Range DSL Line Driver mDSL Rack Card ...

Страница 2: ...ment in a residential area is likely to cause interference in which case the user at his own expense will be required to take whatever measures may be necessary to correct the interference Changes or modifications not expressly approved by the party responsible for compliance could void the user s authority to operate the equipment This digital apparatus does not exceed the Class A limits for radi...

Страница 3: ... fabricante 7 El aparato eléctrico debe ser montado a la pared o al techo sólo como sea recomendado por el fabricante 8 Servicio El usuario no debe intentar dar servicio al equipo eléctrico más allá a lo descrito en las instrucciones de operación Todo otro servicio deberá ser referido a personal de servicio calificado 9 El aparato eléctrico debe ser situado de tal manera que su posición no interfi...

Страница 4: ...r una antena externa deberá ser localizada lejos de las lineas de energia 16 El cable de corriente deberá ser desconectado del cuando el equipo no sea usado por un largo periodo de tiempo 17 Cuidado debe ser tomado de tal manera que objectos liquidos no sean derramados sobre la cubierta u orificios de ventilación 18 Servicio por personal calificado deberá ser provisto cuando A El cable de poder o ...

Страница 5: ...orer is a registered trademark of Microsoft Corporation IPX is a trademark of Novell Incorporated NetBIOS is a registered trademark of International Business Machines Corporation Netscape is a registered trademark of Netscape Communications Corporation Any other trademarks mentioned in this manual are acknowledged to be the property of the trademark owners ...

Страница 6: ...terface Card 18 3 3 1 DB25 RS 530 and V 24 Rear Card Strap Settings 19 3 3 2 M 34 V 35 Rear Card Strap Settings 21 3 3 3 DB15 X 21 Rear Card Strap Settings 22 4 Installation 27 4 1 The Rack Chassis 27 4 2 Installing the mDSL Rack Card into the Chassis 28 4 3 Wiring the mDSL Rack Card 29 4 3 1 Connection to the Twisted Pair Interface 29 4 3 2 Two Wire Cable Connection via RJ 45 29 5 Operation 30 5 ...

Страница 7: ...ctions 49 D 5 1 Connect Twisted Pair 120 ohm to G 703 G 704 Network 49 D 5 2 Connect Dual Coaxial Cable 75 ohm to G 703 G 704 Network 50 Appendix E 10BASE T Ethernet Rear Card Module 52 E 1 Description 52 E 2 Configuration 53 E 3 Connecting the Interface Driver Board 53 E 4 Installing the Rear Interface Card and the Front Function Card 54 E 5 Connecting to the 10BASE T Ethernet Port 55 E 5 1 Conne...

Страница 8: ...ine Loopback and Remote Digital Loopback activated by front panel switch or via serial interface LED Status Indicators TD RD CTS CD DTR NS no signal ER error and TM test mode Connectors RJ 45 or terminal block on line side DB25 female M 34 female DB15 female or dual BNC on serial interface side depending upon which interface module is installed Temperature Range 32 to 122 F 0 to 50 C Altitude Up t...

Страница 9: ...n switches As a symmetric DSL NTU the mDSL Rack Card offers the same data rates in both directions over a single pair of regular telephone lines using Carrierless Amplitude and Phase CAP modulation The mDSL Rack Card is designed to fit into Black Box s 2U high rack chassis part number RM260 This chassis uses a mid plane architecture allowing front cards to be plugged into different rear cards Plea...

Страница 10: ...MP network management with in band management of remote units plus advanced diagnostics and statistics using the RM261C SNMP Internal external or receive recovered clocking options LED indicators for TD RD CTS CD DTR TM ER and NS ...

Страница 11: ... An interface driver board strap and three eight position DIP switches are positioned on the bottom side of the front card see Figure 3 1 Figure 3 1 The mDSL Rack Card s configuration switches Figure 3 2 shows the orientation of the DIP switches with respect to the ON and OFF positions Figure 3 2 Close up of configuration switches all switches are identical in appearance SW3 SW2 SW1 ...

Страница 12: ...rd on the top of the mDSL front card 2 Lift the interface board gently off of the PC board 3 Locate the correct interface on the bottom of the driver board For example the RS 232 V 35 interface board is marked THIS SIDE UP FOR RS 232 on one side and THIS SIDE UP FOR V 35 on the other side Other single interface boards are marked with FRONT on one side of the board 4 Re orient the interface board i...

Страница 13: ...ODULE The serial port on the X 21 interface module is default wired as a DCE but may be switched to a DTE This is done by reversing the orientation of the DCE DTE strap as described below To reverse DCE DTE orientation remove the interface module according to the instructions in Section 3 1 1 The DCE DTE strap is located on the top side of the interface module s PC board The arrows on the top of t...

Страница 14: ...the clocking mode and response to DTE loop enable Default settings of S2 are shown in Table 3 1 Table 3 1 S2 summary Position Function Factory Default S2 1 Reserved Off S2 2 Reserved Off S2 3 Reserved Off S2 4 Reserved Off S2 5 Reserved Off S2 6 Clock Mode On S2 7 Clock Mode On S2 8 Enable Loop from DTE Off Disable Switches S2 1 S2 2 S2 3 S2 4 and S2 5 These switches are reserved for future use an...

Страница 15: ... clock generated internally CO Off On External DTE Transmit clock derived from the terminal interface CP On Off Receive Recover Transmit clock derived from the receive line Off Off Reserved Switch S2 8 Enable Disable Loop Tests from DTE Use Switch S2 8 to allow the mDSL Rack Card to enter loopback tests when the DTE raises the appropriate loop request pin Table 3 3 Enable disable loop tests S2 8 S...

Страница 16: ...n S3 6 DTE Rate On S3 7 Reset Software Defaults On Normal operation S3 8 Transmit Data Sample Point On Normal operation Switch S3 1 DTE Rate Use Switches S3 1 through S3 6 to set the rate adaptive DTE bit rate Table 3 5 DTE bit rate S3 1 S3 2 S3 3 S3 4 S3 5 S3 6 DTE Rate kbps Off Off On On On On 64 On On Off On On On 128 Off On Off On On On 192 On Off Off On On On 256 Off Off Off On On On 320 On O...

Страница 17: ...f Off On 1792 On On On On On Off 1856 Off On On On On Off 1920 On Off On On On Off 1984 Off Off On On On Off 2048 On On Off On On Off 2112 Off On Off On On Off 2176 On Off Off On On Off 2240 Off Off Off On On Off 2304 NOTE The actual line rates of the line driver is determined by the selection of the DTE rate To see the line rate associated with various DTE rates refer to the distance chart in App...

Страница 18: ...n the rack cards before installation of the standalone units thus saving time spent configuring and re configuring DIP switch settings The mDSL Rack Card Plug and Play feature allows you to configure the DTE rate for the link from the rack card at the Central Office CO The standalone unit at the Customer Premise CP site will automatically configure itself to the DTE rate of the rack card Other con...

Страница 19: ...talled For more information on the SNMP management of your rack please refer to the SNMP Management Module Operations Manual 3 3 Configuring the Rear Interface Cards The mDSL Rack Card has five interface card options 10BASE T G 703 RS 530 V 35 and X 21 Each of these options supports one DTE interface connection and one 2 wire line connection NOTE The ME0004C rear cards are specifically designed to...

Страница 20: ...tions and possible settings for each rear card 3 3 1 DB25 RS 530 AND V 24 REAR CARD STRAP SETTINGS Figure 3 6 shows strap locations for the DB25 rear cards These straps determine various grounding characteristics for the terminal interface and twisted pair lines JB3 and JB4 are user configurable Figure 3 6 Strap locations JB3 JB4 ...

Страница 21: ... and FRGND JB3 In the connected position this strap links DB25 pin 1 and frame ground In the open position pin 1 is disconnected from frame ground Table 3 9 DTE shield and FRGND JB3 Position 1 2 DTE Shield Pin 1 and FRGND connected Position 2 3 DTE Shield Pin 1 and FRGND not connected FRGND and SGND JB4 In the connected position this strap links DB25 pin 7 signal ground and frame ground through a ...

Страница 22: ...ected Figure 3 7 Strap locations Table 3 11 provides an overview of interface strap functions for the rear interface cards Following the table overview are detailed descriptions of each strap s function Table 3 11 Interface card strap summary Strap Function Position 1 and 2 Position 2 and 3 JB3 DTE Shield Pin A Connected Open and FRGND JB4 FRGND and Connected Open SGND Pin B Default setting JB3 JB...

Страница 23: ...D not connected FRGND and SGND JB4 In the connected position this strap links signal ground and frame ground through a 100 ohm resistor In the open position signal ground is disconnected from frame ground Table 3 13 FRGND and SGND JB4 Position 1 2 FRGND and SGND connected Position 2 3 FRGND and SGND not connected 3 3 3 DB15 X 21 REAR CARD STRAP SETTINGS Figure 3 8 shows strap locations for the DB1...

Страница 24: ...ap functions for the rear interface cards Following the table overview are detailed descriptions of each strap s function Table 3 14 Interface card strap summary Strap Function Position 1 and 2 Position 2 and 3 JB3 DTE Shield Pin 1 Connected Open and FRGND JB4 FRGND and Connected Open SGND Pin 8 JB3 JB4 ...

Страница 25: ...D JB3 Position 1 2 DTE Shield Pin 1 and FRGND connected Position 2 3 DTE Shield Pin 1 and FRGND not connected FRGND and SGND JB4 In the connected position this strap links DB15 pin 8 signal ground and frame ground through a 100 ohm resistor In the open position pin 8 is connected directly to frame ground Table 3 16 FRGND and SGND JB4 Position 1 2 SGND Pin 8 and FRGND connected through a 100 ohm re...

Страница 26: ... of Jumper JP1 Figure 3 9 View of the X 21 daughterboard DCE DTE selector and JP1 Follow the steps below for proper installation of the X 21 daughterboard WARNING The X 21 daughterboard connector is not keyed and can be installed incorrectly 1 On the top side of the X 21 daughterboard locate the designator shown Front X 21 2 Install the X 21 daughterboard onto the front card with the Front X 21 ar...

Страница 27: ...introduce bit errors Bit errors can also occur when long cables are used to interconnect the modem to an X 21 terminal device router multiplexor etc To solve bit error problems due to speed and or long cables the X 21 daughterboard is equipped with a jumper selector JP1 that changes the sampling edge of the transmit clock Refer to Figure 3 9 for jumper JP1 location The following is a brief descrip...

Страница 28: ...to be extracted and transported conveniently Figure 4 1 The rack chassis THE RACK POWER SUPPLY The power supply included in the rack uses the same mid plane architecture as the modem cards The front card of the power supply slides in from the front and the rear card slides in from the rear They plug into one another in the middle of the rack The front card is then secured by thumbscrews and the re...

Страница 29: ...tched off at any time without harming the installed cards 4 2 Installing the mDSL Rack Card into the Chassis The mDSL Rack Card is composed of a front card and a rear card The two cards meet inside the rack chassis and plug into each other by way of mating 50 pin card edge connectors Use the following steps as a guideline for installing each mDSL Rack Card into the rack chassis 1 Slide the rear ca...

Страница 30: ... or a compatible model at each end of a single twisted pair interface 2 To function properly the mDSL Rack Card needs one twisted pair of metallic wire This twisted pair must be unconditioned dry metallic wire between 19 0 9 mm and 26 AWG 0 4 mm the higher number gauges may limit distance some what Standard dial up telephone circuits or leased circuits that run through signal equalization equipmen...

Страница 31: ...owing Figure 5 1 is a description of each LED s function Figure 5 1 Front panel LEDs TD and RD Glows yellow to indicate an idle condition of Binary 1 data on the respective terminal interface signals Green indicates Binary 0 data CTS Consists of two LEDs one yellow one green CTS glows green to indicate that the Clear to Send signal from the modem is active Yellow indicates inactive CTS CD Consists...

Страница 32: ...DSL Rack Card is not connected with the remote mDSL Rack Card The TM LED will flash for 400 msec when a valid packet is received from the SNMP Management Module 5 2 Test Modes The mDSL Rack Card offers two proprietary loopback test modes plus a built in V 52 BER test pattern generator to evaluate the condition of the modems and the communication link These tests can be activated physically from th...

Страница 33: ...ink the far end will begin receiving unframed packets and assume that the line has gone down During test modes we force the pattern generator to time out before it can cause the link to be killed Loop Control This part of the processor is used to control loopbacks In a Local Loop the data is looped back towards the local DTE In a Remote Loop the data is looped back to the line but it is also allow...

Страница 34: ...LOOPS AND PATTERNS The following section describes the test modes used in the mDSL Rack Card At the bottom of each test mode a figure is included to show the data path Local Loop There are two different modes of operation for a local loop depending on the status of the units at the time that the local loop is initiated If the units are not linked NS LED on and the local loop is initiated either by...

Страница 35: ...cal loop is initiated either by the front panel switch or the DTE interface two separate loop paths will be started In the first path data presented to the local DTE interface will be looped back to the local DTE within the framer In the second path data presented at the far end DTE will be transmitted to the local DTE then looped back within the local DTE loop control block with the processor Aft...

Страница 36: ...e is set to one minute but the 511 511E pattern will timeout after 45 seconds allowing the framer to begin seeing framed packets and not restart the box After the 511 511E pattern times out the ER LED will begin flashing It will remain this way until the pattern generator switch is turned off Note that the data at the local DTE and the remote DTE are not valid Because the data is unframed there is...

Страница 37: ...son will be explained in the RDL with 511 511E section If the line is disconnected the local unit will restart NS LED activated after 4 to 6 seconds but the remote unit will wait for one minute before it restarts Note that the transmit data at the remote DTE is ignored When the switch is thrown or the DTE removes the RDL request the local unit will transmit an RDL_OFF request to the remote unit Th...

Страница 38: ...Mode you can turn on the 511 511E pattern generators on both ends of the link Once a 511 511E pattern is selected on one end of the link the pattern generator will begin transmitting unframed 511 511E through the line to the remote end A possible problem with this test can occur due to the restart procedure Once the local 511 511E is turned on the remote unit begins receiving an unframed 511 patte...

Страница 39: ...resent move the V 52 toggle switch to the right activating the 511E test with errors present If the test is working properly the local modem s red ER LED will glow A successful 511E test will confirm that the link is in place and that the mDSL Rack Card s built in 511 generator and detector are working properly NOTE The V 52 BER tests can be used independently of the Remote Digital Loopback tests ...

Страница 40: ...d C RTS Request to Send D CTS Clear to Send E DSR Data Set Ready F CD Carrier Detect H DTR Data Terminal Ready L LLB Local Line Loop M TM Test Mode N RDL Remote Digital Loop P TD Transmit Data A R RD Receive Data A S TD Transmit Data B T RD Receive Data B U XTC External Transmit Clock A V RC Receive Timing A W XTC External Transmit Clock B X RC Receive Timing B Y TC Transmit Clock A AA TC Transmit...

Страница 41: ...R Data Set Ready A 7 SGND Signal Ground 8 CD Carrier Detect A 9 RC Receive Timing B 10 CD Carrier Detect B 11 XTC External Transmit Clock B 12 TC Test Control B 13 CTS Clear to Send B 14 TD Transmit Data B 15 TC Test Control 16 RD Receive Data A 17 RC Receive Timing A 18 LLB Local Line Loop 19 RTS Request to Send B 20 DTR Data Transfer Rate A 21 DL Remote Digital Loop 22 DSR Data Set Ready B 23 DT...

Страница 42: ...E configuration Pin Signal 1 Frame Ground 2 T Transmit Data A 3 C Control A 4 R Receive Data A 5 I Indication A 6 S Signal Element Timing A 7 BT Byte Timing A Not Used 8 SGND Signal Ground 9 T Transmit Data B 10 C Control B 11 R Receive Data B 12 I Indication B 13 S Signal Element Timing B 14 BT Byte Timing B Not Used ...

Страница 43: ... 1024 1552 1088 1536 13 600 2 6 4 2 19 200 3 6 5 9 2064 1600 2048 12 200 2 3 3 7 17 200 3 3 5 2 2320 2112 2304 11 500 2 2 3 5 15 800 3 4 8 Table B 2 Crosstalk 49 adjacent CAP pairs Line DTE Rates 26 AWG 24 AWG Rate 0 4 mm 0 5 mm kbps kbps feet miles km feet miles km 144 64 128 16 992 3 2 5 2 25 000 4 7 7 6 272 192 256 15 088 2 9 4 6 22 000 4 2 6 7 400 320 384 13 264 2 5 4 20 000 3 8 6 1 528 448 51...

Страница 44: ...signments Appendix C Line Interface Pin Assignments Table C 1 RJ 45 connector pinout Pin Number Signal 1 N C No connection 2 N C No connection 3 N C No connection 4 Tip 5 Ring 6 N C No connection 7 N C No connection 8 N C No connection ...

Страница 45: ...ning the nx64 DTE rate This application allows the remote user without a G 703 G 704 interface to extend the serial interface that is available to the G 703 G 704 access point without the need for a separate G 703 G 704 to serial converter In the G 703 G 704 network extension application two modules are used one at each end of the link This application allows you to extend the G 703 G 704 network ...

Страница 46: ...over the baseband line driver link see Figure D 2 Figure D 2 Clock settings in a network extension application Clock Data Clock Data V 35 Router Data Clock Data nx64 kbps G 703 G 704 Network Module and Line Driver Line Driver with Serial Interface Module ME0004C ME0004C Cable Span V 35 Module External Clocking Receive Recover Clocking Clock Data Clock Data Clock Data Clock Data nx64 kbps G 703 G 7...

Страница 47: ...rough S1 8 The DIP switches can be configured as either On or Off Figure D 3 shows the location of the DIP switches on top of the Rear Card printed circuit board Figure D 3 Top view of the Rear Card showing the location of the DIP switches Switch S1 1 Line Coding Use switch S1 1 to control the network line coding options Set these options to the same as the line coding that has been provided by yo...

Страница 48: ... 4 Multiframe CRC 4 multiframe uses time slot zero to carry CRC 4 information When CRC 4 is enabled ON the unit synchronizes to the CRC 4 multiframe protocol Table D 2 CRC 4 multiframe S1 2 Option Off Disabled On Enabled NOTE When the data rate is set to 2048 kbps the module transmits user data on all 32 timeslots ignoring framing information In this case switch S1 2 will be ignored Switch S1 3 Cl...

Страница 49: ...t input and output impedance matching between the module and external line Figure D 4 shows the jumper locations Figure D 4 Top view of the rear card module showing the location of the jumpers The following is a description of the jumper settings with respect to the front panel connectors 1 For a 75 ohm connection coax install JP4 JP7 default 2 For a 120 ohm connection RJ 48C remove JP4 JP7 D 4 In...

Страница 50: ...gure D 5 Module rear panels showing the location of the connectors D 5 1 CONNECT TWISTED PAIR 120 OHM TO G 703 G 704 NETWORK The module is equipped with a single RJ 48C jack for connections to a 120 ohm twisted pair G 703 G 704 network interface If your G 703 G 704 network terminates via RJ 48C use Figure D 6 and Table D 4 to make the proper connections The connector pinout and signals are shown i...

Страница 51: ...ield D 5 2 CONNECT DUAL COAXIAL CABLE 75 OHM TO G 703 G 704 NETWORK The module is also equipped with dual female BNC connectors TX and RX for connector to a 75 ohm dual coax G 703 G 704 network interface If your G 703 G 704 network terminates via dual coaxial cable use Figure D 7 to make the proper connections The connector pinout and signals are also shown Not connected 8 Not connected 7 Not conn...

Страница 52: ...G 703 G 704 Rear Card Module Figure D 7 75 ohm dual coaxial G 703 interface NOTE The outer conductor of the coax cables are isolated from system earth ground Data FROM G 703 G 704 network Data TO G 703 G 704 network ...

Страница 53: ...in the local Managed Micro Rack the Ethernet Bridge Module works in a plug and play manner to forward LAN broadcasts multicasts and frames destined for the peered Ethernet LAN at the remote end the base unit at the remote end must be equipped with an Ethernet Module Using the Ethernet Bridge Module peered Ethernet LANs can be linked over leased 2 wire 4 wire DDS PCM and campus fiber circuits The E...

Страница 54: ...chronous speeds 2 Clocking mode Set the clocking modes on the base units so that one unit is configured for internal clocking mode and the other unit is set for receive recover clocking mode Table E 1 Base unit clock modes Unit A Unit B Internal clock setting Receive recover clock setting NOTE Unit A and B are chosen arbitrarily It does not matter which unit is A and which is B 3 When using the Et...

Страница 55: ...it front card 2 Lift the old interface board gently off the printed circuit board 3 Position the interface driver board on top of the function card s PC board with the sockets oriented toward the male pins Be sure that the label marked FRONT is pointed toward the front of the function card toward the LEDs 4 Push the interface driver board gently onto the socket and re install the function card int...

Страница 56: ...gh an RJ 45 connector Figure E 3 shows the rear panel and the locations of the connectors Figure E 3 Rear panel RJ 45 connectors The RJ 45 Ethernet port on the rear card connects directly to a 10BASE T network Figure E 4 shows the 10BASE T RJ 45 port pin description You may make connections up to 330 feet 100 m using Type 4 or 5 cable RJ 45 Line Side 10BASE T Connector ...

Страница 57: ...the rear card to a 10BASE T hub Rear Card 10BASE T Hub RJ 45 Pin No RJ 45 Pin No 1 TD 1 RD 2 TD 2 RD 3 RD 3 TD 6 RD 6 TD Figure E 5 Straight through cabling E 5 2 CONNECTING THE 10BASE T ETHERNET PORT TO A PC DTE The rear card interface is configured as DTE Data Terminal Equipment If you wish to connect the rear card to another DTE device such as a 10BASE T network interface card in a PC you must ...

Страница 58: ...ther rear card over 2 or 4 wire twisted pair 2 or 4 wire operation is determined by the front function card 2 To function properly the rear card needs one or two twisted pairs of metallic wire 2 or 4 wire The twisted pairs must be unconditioned dry metallic wire between 19 0 9 mm and 26 AWG 0 4 mm Standard dial up telephone circuits that run through signal equalization equipment or standard flat m...

Страница 59: ...ey are automatically deleted from the MAC address table if they experience an inactivity of 8 minutes E 6 1 POWER UP The rear card is hot swappable It receives power from the rack power bus Therefore it is powered up as soon as it is plugged into the rack and the rack power supply is turned on E 6 2 LED STATUS MONITORS The 10BASE T Ethernet rear card features two LEDs that monitor general operatin...

Страница 60: ...ier Detect CD from base unit are not asserted 4 pulses Rear card buffer is saturated 5 pulses WAN receive frame s too large 6 pulses WN receive frame s not Octet aligned 7 pulses WAN receive frame s aborted 8 pulses Detected WAN receive frame s with bad CRC 9 pulses Detected LAN receive frame s too large 10 pulses Detected LAN receive frame s not Octet aligned 11 pulses Detected LAN receive frame ...

Страница 61: ...1000 Park Drive Lawrence PA 15055 1018 724 746 5500 Fax 724 746 0746 Copyright 2001 Black Box Corporation All rights reserved ...

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