Chapter 11. Troubleshooting

B.Ensure that the ISU 128 is set up with the correct SPID and LDN by selecting CONFIG, Netw. options, Dial Line, Terminal ID, SPID/LDN.

C.Try swapping SPID1 with SPID2 and LDN1 with LDN2. Determine if the problem is the second phone number or the quantity of phone numbers.

D.Try another piece of functioning ISDN equipment with a U-interface on the ISDN line.

E.With the ISU 128 connected to the ISDN line and powered up, talk to your service provider's repair group and tell them you have an ISDN basic rate line that appears physically okay but has no TEI. Ask them to check the line translation and ensure that the line supports dynamic TEI allocation.

Tell them that you have an NT1 and terminal adapter device connected to the line.

7.If the ISU 128 continues to read Register SPID #2, the ISU 128 has com- pletely initialized the first phone number but is unable to establish logical layer 3 for the second phone number. The problem is in one or more of the following places:

The ISU 128 software setup

The telephone service provider's software setup

To isolate the problem, use the following procedure:

A.Ensure the ISDN line is multipoint with two phone numbers.

B.Ensure that the ISU 128 is set up with the correct SPID and LDN by selecting CONFIG, Netw. options, Dial Line, Terminal ID, SPID/LDN.

C.Try swapping SPID1 with SPID2 and LDN1 with LDN2.

Determine if the problem is the second phone number or the quantity of phone numbers.

D.Try another piece of functioning ISDN equipment with a U-interface on the line.

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ADTRAN ISU 128 user manual Troubleshooting

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.