ADTRAN ISU 128 user manual Loopback Remote, Test Remote, Loopback Disable

Models: ISU 128

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Chapter 5. Testing

Loopback Remote

Loopback Remote allows the ISU 128 to issue a V.54 in-band loopback com- mand to a far-end unit while still accepting data from the DTE connector. This provides bit error rate testing of an entire link using an external BERT test set. To use this feature, both units must be configured for Clear Channel operation and the far-end unit must be able to respond to V.54 loopback commands. See the chapter Protocol Options to configure the unit for Clear Channel operation. Press the Cancel key to end the test.

Loopback Remote 1B and 2B are only used with the DTE set to asynchronous.

Test Remote

Test Remote allows the ISU 128 to issue a V.54 in-band loopback command to a far-end unit and BERT the link using a built-in 2047 pattern generator/ checker. This allows for testing a circuit without any extra test equipment. To use this feature, both units must be configured for Clear Channel operation and the far-end unit must be able to respond to V.54 loopback commands. See the chapter Protocol Options to configure the unit for Clear Channel operation. The built-in 2047 pattern generator/checker displays the number of bytes transmitted on the top line and the number of errored bytes received on the lower line of the front panel display. Press 0 to clear the counts. By pressing the down arrow, you can loop down the far end unit and run a head to head 2047 pattern test. Press Cancel to end the test.

Loopback Disable

The following options are available when disabling loopbacks:

No Remote Loopbacks

The ISU 128 ignores all V.54 and DDS loopback commands.

DDS Accepted

The ISU 128 responds to DSU Latching Loopback commands. This option only takes effect if the unit is in leased line mode.

V.54 Accepted

The ISU 128 responds to V.54 loopback commands.

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ISU 128 User Manual

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ADTRAN ISU 128 user manual Loopback Remote, Test Remote, Loopback Disable

ISU 128 specifications

The ADTRAN ISU 128 is a versatile and robust integrated service unit designed for network access solutions, particularly within telecommunications and enterprise environments. This unit plays a critical role in enabling high-speed data transmission, supporting various voice, video, and data services over traditional and next-generation networks.

One of the noteworthy features of the ADTRAN ISU 128 is its ability to aggregate multiple digital circuits into a single access point. It supports T1, E1, and fractional T1/E1 interfaces, making it a flexible choice for customers with different bandwidth needs. The unit allows for seamless migration from legacy systems to modern broadband services, ensuring that businesses can scale their operations without significant infrastructure changes.

The ADTRAN ISU 128 also excels in its support for various protocols, including Frame Relay and ATM, providing the necessary flexibility to adapt to different network architectures. This adaptability is essential for businesses that rely on diverse communication platforms to maintain connectivity and operational efficiency.

Another significant aspect of the ISU 128 is its built-in features for diagnostics and monitoring. The unit includes comprehensive loopback and performance monitoring capabilities, which enable network administrators to troubleshoot potential issues proactively. This functionality ensures a reliable connection and minimizes downtime, which is critical for maintaining service-level agreements (SLAs).

In terms of user interface, the ADTRAN ISU 128 is designed with ease of use in mind. The unit can be configured and managed through a web-based graphical user interface, allowing for straightforward remote access to settings and performance metrics. This capability facilitates quick adjustments and upgrades, helping to streamline network management tasks.

The ISU 128 is also built with a strong emphasis on reliability and durability. It is housed in a compact, rack-mountable design, making it suitable for various deployment environments. These characteristics, combined with support for redundant power supplies, enhance the unit's reliability in critical operations.

Overall, the ADTRAN ISU 128 stands out as a powerful solution for organizations seeking to optimize their network access. With its advanced features, compatibility with multiple technologies, and emphasis on reliability, the ISU 128 is an ideal choice for those looking to enhance their communication infrastructure in a rapidly evolving digital landscape.