ADTRAN DSU 56 user manual Near END Tests, DTE only Test

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Chapter 3. Test Modes

If an EPROM CHECKSUM failure is detected during self test, CS, ALM, PTRN, and ERROR indicators all flash at the end of the self test.

NEAR END TESTS

The local DSU 56/64 can perform the following near end tests:

•DTE Only

•DTE with Test Pattern

•DTE and LOOP (LL)

•Loop Only (RT)

DTE ONLY TEST

The DTE ONLY test can test both the DTE interface of the local DSU 56/64 plus its loop transmitter and receiver. For this test, the loop transmit data is connected to the loop receive data at a point close to the physical network interface.

The loopback point and the signal paths for this test are shown in Figure 3-1.

DTE or Test Equipment Interface

	56/64 DSU	Network
DTE	Loop	Interface
Transmit	Transmit
Interface	Interface
		Loop TX
	DTE
	Only
		Loop RX
DTE	Loop
Receive	Receive
Interface	Interface

Figure 3-1. DTE Only Test Diagram

3-2

DSU 56/64 User Manual

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Contents DSU 56/64 Page Important Safety Instructions Save These 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 Post-Sale Support Customer Service, Product Support Information, and TrainingPresales Inquiries and Applications Support Repair and ReturnTraining Table of Contents Appendix A. Pinouts Appendix B. Specifications Index Index-1 List of Figures DSU 56/64 UnitList of Figures Xvi List of Tables List of Tables Xviii Introduction Product OverviewFront Panel Network Status RedTest Switches Test Status/Error Yellow/RedBeing utilized for testing LoopRear Panel DSU 56/64 Rear PanelInstallation UNPACK, INSPECT, Power UPClear To Send CS SW Down Normal ConfigurationClear to Send Delay CS Delay SW Switch Position Up OnCarrier Detect CD SE Down Normal Antistream SWDown Off Data Set Ready SR SW Down OnLoop Rate SW Down 56 Kbps Remote Digital Loopback RDL SW Down EnableUp Disable Up 64 kbpsNetwork Connections Default Option Switch SettingsSwitch Position Setting DTE ConnectionsInstallation Self Test Test ModesNear END Tests DTE only TestDTE with Test Pattern TP DTE with TP Test Diagram DTE and Loop Test LLDTE and Loop Test Diagram Loop Only Test Diagram Loop only Test RTFAR END Tests Remote DigitalTest Pattern Ptrn Remote Tests Test Modes Appendix a Pinouts Table A-2. V.35 DTE Pinouts PinDescription Appendix B Specifications Specifications and FeaturesHardware Specifications DiagnosticsPower 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.