Black Box ME759C-RJ45, ME758C-RJ45, May-95 manual Summary of Interface-Module Jumper Functions

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MULTI-FUNCTION LD CARD

Table 3-5, below, provides a summary of the functions of these jumpers. The functions are described in more detail afterward.

Table 3-5. Summary of Interface-Module Jumper Functions

Jumper

Function

Pos. 1 & 2

Pos. 2 & 3

 

 

 

 

 

 

JB2

Line Shield and FGND

Connected

N/C*

 

JB3

PGND (DTE Pin 1) and FGND

Connected

N/C*

 

JB4

SGND and FGND

Connected

N/C*

 

 

 

 

 

 

*factory-default settings

Line Interface: Line Shield Connection to Frame Ground (JB2)

This jumper applies to the line interface. When this jumper is in positions 1 and 2, it links RJ-11 Pins 1 and 6 or RJ-45 Pins 2 and 7 on the corresponding line to the interface module’s frame ground. (If you are using shielded twisted-pair cable, the shield can be connected to these pins.) In positions 2 and 3, RJ-11 Pins 1 and 6 or RJ-45 Pins 2 and 7 remain connected to each other, but are disconnected (“lifted”) from frame ground.

JB2

Positions 1 and 2 = Line Shield and FGND Connected

Positions 2 and 3 = Line Shield and FGND Not Connected (default)

CAUTION!

If you connect shield to frame ground, make sure that RJ-11 Pins 1 and 6 or RJ-45 Pins 2 and 7, as well as the cable shield, are connected to ground at one end of the cable only. Connecting them at both ends of the cable will defeat the transformer isolation and will leave your system open to damage from ground loops.

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Contents Multi-Function LD Cards FCC Statements MULTI-FUNCTION LD Card NOM Statements Contents Specifications Indicators DiagnosticsConnectors Temperature PowerWeight FuseFeatures IntroductionOverview Introduction Main-module switches Setting the Switches on the Main ModuleSwitch S1 Summary On and OFF settings of the DIP switchesS1 Positions 1 through 4 Data-Rate Setting S1 Positions 5 and 6 Clock SourceS1 Position 7 Protocol Switch S2 Summary S2 Position 2 2-Wire vs -Wire OperationS1 Position 8 Carrier-Control Method S2 Positions 4 and 5 RTS/CTS Delay S2 Position 3 V.52 and V.54 Diagnostic TestingS2-6 Signaling-Rate Range S2-7 and S2-8 Word LengthS3-1 and S3-2 Input Impedance Switch S3 SummaryS3-4 Mode Selection Recommended Impedance SettingsS3-5 DTE RS-232 Initiation of Local Loopback Test S3-6 DTE RS-232 Initiation of Remote Loopback TestS3-7 and S3-8 Antistream Control Setting the Jumpers on the Interface ModuleFour interface modules Jumper locations Line Interface Line Shield Connection to Frame Ground JB2 Summary of Interface-Module Jumper FunctionsJB5 Serial Interface Signal Ground and Frame Ground JB4MicroRacks An Overview InstallationMicroRacks’ Power Supply Installing the Multi-Function LD Card in the MicroRack RS-232 Serial Cables and Connectors Pinout of the RS-232 InterfacePinout of the 10-Pin RJ Interface Modem-to-Modem Line Cables and Connectors AT&T standard modular color codes Line-Cable PinoutsMultipoint Applications Two-pair star wiring for host and slave CardsStatus LEDs Operation and DiagnosticsRTS and CD Indicators Diagnostic Testing Using the Error LED Power-Up V.54 and V.52 Diagnostic Tests Remote Digital Loopback RDL Using the V.52 Bert Test Independently Troubleshooting Calling Your SupplierShipping and Packaging Appendix Cable Recommendations Wire Gauge Capacitance ResistanceMULTI-FUNCTION LD Card Copyright 1995. Black Box Corporation. All rights reserved