Black Box ME759C-RJ45, ME758C-RJ45, May-95, ME759C-RJ11, ME758C-RJ11 manual RTS and CD Indicators

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MULTI-FUNCTION LD CARD

5.1.2THE RTS AND CD INDICATORS

The RTS and CD indicators (again, one red and one green LED for each signal) function much like the TD and RD LEDs: The red LEDs light for a “low” signal, while the green LEDs light for a “high” signal. The RTS LEDs light for an incoming RTS signal on the RS-232 side (DB25 Pin 4 or 10-pin RJ Pin 9). The CD LEDs light for an incoming signal on the line side and the resulting output signal on the RS-232 side (DB25 Pin 8 or 10-pin RJ

Pin 3).

5.1.3THE POWER INDICATOR

The green Power LED lights to indicate that the Card is receiving power.

5.1.4THE TEST INDICATOR

The green Test LED lights to indicate that V.52 or V.54 tests are running.

5.1.5THE ERROR INDICATOR

The red Error LED has three functions:

A.When the Card is in test mode (green Test LED is lit), the Error LED glows red when bit errors occur.

B.When the Card is not in test mode (green Test LEDis dark), the Error LED is used to indicate an RTS streaming condition (see Section 5.2.2).

C.The Error LED can also indicate line-quality problems (see Section 5.2.1) such as:

1.The improper use of “flat satin” (non-twisted-pair) cable, or low- quality twisted-pair cable, to connect the modems.

2.One or more broken wires in the 4-wire twisted-pair cable.

4. Broken or corroded connectors.

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Contents Multi-Function LD Cards FCC Statements MULTI-FUNCTION LD Card NOM Statements Contents Specifications Diagnostics IndicatorsConnectors Fuse PowerTemperature WeightIntroduction FeaturesOverview Introduction Main-module switches Setting the Switches on the Main ModuleSwitch S1 Summary On and OFF settings of the DIP switchesS1 Positions 5 and 6 Clock Source S1 Positions 1 through 4 Data-Rate SettingS1 Position 7 Protocol S2 Position 2 2-Wire vs -Wire Operation Switch S2 SummaryS1 Position 8 Carrier-Control Method S2-7 and S2-8 Word Length S2 Position 3 V.52 and V.54 Diagnostic TestingS2 Positions 4 and 5 RTS/CTS Delay S2-6 Signaling-Rate RangeS3-1 and S3-2 Input Impedance Switch S3 SummaryS3-6 DTE RS-232 Initiation of Remote Loopback Test Recommended Impedance SettingsS3-4 Mode Selection S3-5 DTE RS-232 Initiation of Local 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 Pinout of the RS-232 Interface RS-232 Serial Cables and ConnectorsPinout 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 Calling Your Supplier TroubleshootingShipping and Packaging Appendix Cable Recommendations Wire Gauge Capacitance ResistanceMULTI-FUNCTION LD Card Copyright 1995. Black Box Corporation. All rights reserved