Black Box ME758C-RJ11, ME758C-RJ45, ME759C-RJ45, May-95, ME759C-RJ11 V.54 and V.52 Diagnostic Tests

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CHAPTER 5: Operation and Diagnostics

When the local and remote Multi-Function LD Cards are both powered up and are passing data normally, the LEDs on the Cards will look like this:

•Power: Steadily lit

•TD and RD: Flashing red and green

•RTS and CD: Green steadily lit, red dark

•Test and Error: Dark

5.4 V.54 and V.52 Diagnostic Tests

The Multi-Function LD Card offers two V.54 test modes and two V.52 test modes to evaluate the condition of the modems and the communication link. Both sets of tests can be activated physically from the front panel. The V.54 test can also be activated from the RS-232 interface.

NOTE

V.54 and V.52 test modes on the Multi-Function LD Card are available for point-to-point applications only.

5.4.1LOCAL ANALOG LOOPBACK (LAL)

The Local Analog Loopback (LAL) test checks the operation of the local Multi-Function LD Card, and is performed separately on each unit. Any data sent to the local Multi-Function LD Card in this test mode will be echoed (returned) back to the user device. For example, characters typed on the keyboard of a terminal will appear on the terminal’s screen. To perform a LAL test, follow these steps:

1.Activate LAL. You can do this in either of two ways. One is to move the upper front-panel toggle switch labeled “Remote—Analog” to the “Analog” (right-hand) position. The other is to raise the signal on Pin 18 of the RS-232 interface (switch S3 position 5 must be “On”—see Section 3.1.4). Once LAL is activated, the Card’s transmit output is connected to its own receiver. The Test LED should light.

2.Verify that the attached DTE is operating properly and can be used for a test.

3.Move the lower front-panel toggle switch labeled “511/E—511” to the “511” (right-hand) position. This will activate the V.52 BERT test mode and inject a 511 test pattern into the local loop. If any errors are present in the loop, the Error LED will blink sporadically.

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Contents Multi-Function LD Cards FCC Statements MULTI-FUNCTION LD Card NOM Statements Contents Specifications Diagnostics IndicatorsConnectors Weight PowerTemperature FuseIntroduction FeaturesOverview Introduction Setting the Switches on the Main Module Main-module switchesOn and OFF settings of the DIP switches Switch S1 SummaryS1 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 S2-6 Signaling-Rate Range S2 Position 3 V.52 and V.54 Diagnostic TestingS2 Positions 4 and 5 RTS/CTS Delay S2-7 and S2-8 Word LengthSwitch S3 Summary S3-1 and S3-2 Input ImpedanceS3-5 DTE RS-232 Initiation of Local Loopback Test Recommended Impedance SettingsS3-4 Mode Selection S3-6 DTE RS-232 Initiation of Remote Loopback TestSetting the Jumpers on the Interface Module S3-7 and S3-8 Antistream ControlFour interface modules Jumper locations Summary of Interface-Module Jumper Functions Line Interface Line Shield Connection to Frame Ground JB2Serial Interface Signal Ground and Frame Ground JB4 JB5Installation MicroRacks An OverviewMicroRacks’ 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 Line-Cable Pinouts AT&T standard modular color codesTwo-pair star wiring for host and slave Cards Multipoint ApplicationsOperation and Diagnostics Status LEDsRTS 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 Wire Gauge Capacitance Resistance Appendix Cable RecommendationsMULTI-FUNCTION LD Card Copyright 1995. Black Box Corporation. All rights reserved
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