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V.35 SYNC MODEM ELIMINATOR

5. Troubleshooting

5.1 Calling Black Box

If you determine that your V.35 Synchronous Modem Eliminator is
malfunctioning,

do not attempt to alter or repair the unit

. It contains no user-

serviceable parts. Contact Black Box Technical Support at (724) 746-5500.

Before you do, make a record of the history of the problem. We will be able to
provide more efficient and accurate assistance if you have a complete
description, including:

• the nature and duration of the problem.

• when the problem occurs.

• the components involved in the problem.

• any particular application that, when used, appears to create the problem

or make it worse.

• the results of any testing you’ve already done.

5.2 Shipping and Packaging

If you need to transport or ship your V.35 SME:

• Package it carefully. We recommend that you use the original container.

• If you are returning the V.35 SME, make sure you include everything your

received with it. Before you ship the unit back to us for whatever reason,
contact Black Box to get a Return Authorization (RA) number.

Summary of Contents for ME243A-F

Page 1: ... 5500 FREE technical support 24 hours 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 DECEMBER 1997 ME243A F V 35 Sync Modem Eliminator V 35 Sync Modem Eliminator ...

Page 2: ...pment 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 rad...

Page 3: ...l 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 interfiera su uso La c...

Page 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 ...

Page 5: ...le Section 9 3 1 2 Opening the Top of the Port B End 10 3 2 Setting the DIP Switch 11 3 3 Setting the Jumpers 13 3 4 Reclosing the Housing 15 3 4 1 Closing the Top of the Port B End 15 3 4 2 Closing the Middle Section 15 4 Installation and Operation 16 5 Troubleshooting 18 5 1 Calling Black Box 18 5 2 Shipping and Packaging 18 Appendix Block Diagram 19 ...

Page 6: ...oftware flow control does not support hardware flow control but emulates RTS to CTS delay of 0 7 or 53 ms 15 user selectable Operation Point to point Data Rate 32 48 56 64 72 112 128 or 144 kbps user selectable Maximum Distance 300 ft 91 4 m from one attached DTE to the other User Controls 4 Internal 1 Four position DIP switch for data rate 3 Jumpers for RTS CTS delay carrier control and clock sou...

Page 7: ...to 122 F 0 to 50 C Humidity Tolerance 5 to 95 noncondensing Power From the V 35 Interface on both ports 5 VDC 6 mA drawn from each port s RTS and DTR signals Pins C and H maximum total consumption approximately 120 mW Size 0 8 H x 2 W x 3 D 2 x 5 1 x 7 6 mm Weight 3 3 oz 95 g 0 2 lb 0 1 kg ...

Page 8: ...l or external clock and all necessary data clocking and control signals are supported The V 35 SME implements the V 35 electrical interface on two standard M 34 34 pin M block female connectors The unit draws its power directly from the Request to Send RTS and Data Terminal Ready DTR signal leads Pins C and H on both ports so no AC power or batteries are required You can configure the V 35 SME s b...

Page 9: ... 35 SME s internal clock and do you want carrier constantly ON and an RTS to CTS delay of 7 ms the factory default settings for these options If not you will need to open both the middle portion and the top of the Port B end of the unit s housing Skip ahead and follow the directions in Sections 3 1 1 and 3 1 2 Second will your devices be communicating through the V 35 SME at 32 kbps the factory de...

Page 10: ...he V 35 SME s housing the section with the model and lot number stickers Gently twist the tool until the all plastic top and bottom panels of this housing section begin to pop apart You will probably hear a snapping noise this is normal If they don t come all the way off carefully pry them the rest of the way off with your fingers See Figure 3 1 below Figure 3 1 Removing the middle section ...

Page 11: ...it board as well as the edge of this board the jumpers you need to get at are on the unit s main board beyond and below this edge Figure 3 2 Removing the top panel on the Port B end To remove this panel you need to unscrew and remove the two screws that hold it on These are at the very end of the unit They are the top two screws in Port B s M 34 connector one in the upper left corner one in the up...

Page 12: ...o come off and carefully pry it away from the rest of the unit You will probably hear a snapping noise this is normal 3 2 Setting the DIP Switch As you can see the V 35 SME s four position data rate DIP switch is mounted on an internal daughterboard Figure 3 3 below shows the location of this switch the numbering of its individual switch positions and the directions of their ON and OFF settings re...

Page 13: ...rate Position 4 is reserved for future use Table 3 1 below shows the V 35 SME s possible data rate settings Table 3 1 Data Rate Settings P 1 P 2 P 3 Data Rate Off Off Off 32 kbps factory default On Off Off 48 kbps Off On Off 56 kbps On On Off 64 kbps Off Off On 72 kbps On Off On 112 kbps Off On On 128 kbps On On On 144 kbps ...

Page 14: ... pliers to move the jumpers Figure 3 4 The internal controls The jumpers Notice that in each pair of jumpers one jumper controls the setting of Port A and the other controls that of Port B Also notice that each jumper has three possible settings covering posts 1 and 2 covering posts 2 and 3 or removed usually left covering only a single post so it doesn t get lost The detailed descriptions of each...

Page 15: ...is setting is reserved for future use JP1 RTS CTS Delay The settings of the JP1 jumpers determine the amount of delay after the V 35 SME detects RTS before it sends CTS in response In order to emulate dialup or leased line modems you can set either of these jumpers for 0 ms 7 ms or 53 ms of delay The jumpers for Ports A and B can be configured independently that is you can set them differently JP1...

Page 16: ... just far enough so that its pointy end slightly protrudes from the other side of the hole Now with a screwdriver holding the screw in place fit the washer over the end of the screw then lay the nut on the end of the screw and turn the nut or the screw just far enough for them to grip You might want needle nosed pliers for this step If the washer and or the nut slip through the adjacent hole and i...

Page 17: ...u can plug the V 35 SME directly into that device Then connect the V 35 SME to the other host device using a multipair cable If neither device has an M 34 male V 35 port you ll have to run multipair cable to both devices The total cable length between the two devices must not exceed 300 feet 91 4 m Refer to Figure 4 1 below Remember that if one of the devices rather than the V 35 SME will be suppl...

Page 18: ...e If they do not communicate properly first make sure that all cabling is connected securely then check the configuration of the V 35 SME and of each host device Which one is supplying the clock What s the data rate setting of each device And so on If you re still having trouble contact Black Box for technical support see Section 5 1 ...

Page 19: ... a complete description including the nature and duration of the problem when the problem occurs the components involved in the problem any particular application that when used appears to create the problem or make it worse the results of any testing you ve already done 5 2 Shipping and Packaging If you need to transport or ship your V 35 SME Package it carefully We recommend that you use the ori...

Page 20: ...ator s circuitry DCDA DCDB DSRA DSRB CTSA CTSB RTSA RTSB DTRA DTRB RDA TDB RDA TDB TDA RDB TDA RDB SGND SGND PGND PGND XTC XTC TCA TCB TCA TCB RCA RCB RCA RCB S S S 1 2 3 S V V 5V 5V RTS CTS DELAY SELECT CLOCK SOURCE MODULE 5V 5V POWER SUPPLY CARRIER CONTROL SELECT B RTS CTS DELAY SELECT CARRIER CONTROL SELECT A LEVEL CONVERTERS LEVEL CONVERTERS P O R T A P O R T B ...

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