ADTRAN DSU 56 user manual DTE and Loop Test Diagram

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Chapter 3. Test Modes

56/64 from the remote site over the actual communications circuit. Testing from the remote end of the circuit is performed with test data generated by the remote DSU or terminal type test equipment.

The DTE AND LOOP test splits the DSU 56/64 into separate DTE and Loop interface sections and then loops the transmit data of each interface back to its respective receive data. Figure 3-3 illustrates the loopback points and the signal paths for this test. The DTE AND LOOP LEDs flash during initialization of the test and turn on solid once the test is in progress.

DTE or Test Equipment Interface

TD

RD

DTE

Transmit

Interface

DTE

Receive

Interface

56/64 DSU

DTE

and

Loop

Loop

Transmit

Interface

Loop

Receive

Interface

Network Interface

Loop TX

Loop RX

Figure 3-3. DTE and Loop Test Diagram

To initiate the DTE AND LOOP test, perform the following steps:

1.Press SELECT three times to turn on both the DTE AND LOOP test indicators.

2.Press TEST while these test indicators are on.

3.To terminate this test, press TEST.

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DSU 56/64 User Manual

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Contents DSU 56/64 Page Save These Important Safety Instructions Important Safety InstructionsAffidavit Requirements for Connection to Digital Services Page Page Service Type Digital Facility Service Order Code Canadian Emissions Requirements Canadian Equipment Limitations Limited Product Warranty Presales Inquiries and Applications Support Customer Service, Product Support Information, and TrainingPost-Sale Support Repair and ReturnTraining Table of Contents Appendix A. Pinouts Appendix B. Specifications Index Index-1 DSU 56/64 Unit List of FiguresList of Figures Xvi List of Tables List of Tables Xviii Product Overview IntroductionNetwork Status Red Front PanelBeing utilized for testing Test Status/Error Yellow/RedTest Switches LoopDSU 56/64 Rear Panel Rear PanelUNPACK, INSPECT, Power UP InstallationClear to Send Delay CS Delay SW Switch Position ConfigurationClear To Send CS SW Down Normal Up OnDown Off Antistream SWCarrier Detect CD SE Down Normal Data Set Ready SR SW Down OnUp Disable Remote Digital Loopback RDL SW Down EnableLoop Rate SW Down 56 Kbps Up 64 kbpsSwitch Position Setting Default Option Switch SettingsNetwork Connections DTE ConnectionsInstallation Test Modes Self TestDTE only Test Near END TestsDTE with Test Pattern TP DTE and Loop Test LL DTE with TP Test DiagramDTE and Loop Test Diagram Loop only Test RT Loop Only Test DiagramRemote Digital FAR END TestsTest Pattern Ptrn Remote Tests Test Modes Appendix a Pinouts Table A-2. V.35 DTE Pinouts PinDescription Specifications and Features Appendix B SpecificationsPower DiagnosticsHardware Specifications EnvironmentIndex Index-2

DSU 56 specifications

The ADTRAN DSU 56 is an essential device for businesses and organizations looking to establish reliable serial communication over digital circuits. A Data Service Unit (DSU) acts as a bridge, converting digital data from a Local Area Network (LAN) into a format suitable for transmission over telephone lines or other digital links. The DSU 56 is specifically designed to operate at 56 Kbps, making it a vital component in many networking setups where higher bandwidth is unnecessary.

One of the main features of the ADTRAN DSU 56 is its ability to support a variety of interfaces. It is equipped with both V.35 and RS-232 ports, allowing for flexible connectivity options to diverse networking equipment and configurations. This versatility ensures that organizations can easily integrate the DSU 56 into their existing telecommunications infrastructure.

The DSU 56 is built on advanced technologies that ensure efficient data transfer and reliability. It incorporates error correction mechanisms and extensive diagnostic capabilities, which help identify and troubleshoot issues quickly. This is particularly important in mission-critical applications where downtime can lead to significant operational disruptions.

In addition to reliable data conversion, the DSU 56 offers features like loopback testing and performance monitoring. These functionalities enable network administrators to assess the health and performance of the connection with ease. Loopback tests can be initiated locally or remotely, allowing for thorough testing of the entire data path without disrupting ongoing operations.

Another notable characteristic of the ADTRAN DSU 56 is its compact and robust design. It is built to withstand various operating conditions, making it suitable for deployment in different environments, including data centers and remote installations. The device is also energy efficient, contributing to lower operational costs.

The DSU 56 supports various protocols, such as Frame Relay and PPP, ensuring compatibility with numerous public and private network infrastructures. This adaptability makes it a valuable asset for businesses transitioning to digital communication systems or those seeking to enhance their existing setups.

In conclusion, the ADTRAN DSU 56 stands out as a reliable and versatile solution for organizations needing to facilitate effective data communication over digital circuits. Its robust features, combined with advanced technologies, position it well in the marketplace, making it a choice for businesses focused on maintaining high-quality connectivity.
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