Chapter 11. Troubleshooting

G.With the ISU 128 connected to the ISDN line and powered up, talk to your service provider's repair group and inform them that your ISDN basic rate line has a physical layer 1 problem. Ask them to check the ISDN line. Tell them that you have an NT1-like device at the end of the ISDN line.

4.If the ISU 128 continues to read Getting TEI #1, the ISU 128 is physically connected to your local telephone service provider but is unable to estab- lish logical layer 2. The problem may be one or more of the following:

•The ISU 128 software setup

•The telephone service provider's software setup

•Hardware configuration if the ISDN line is extended from the switch

To isolate the problem, use the following procedure:

A.Ensure the ISU 128 is set up for the correct switch protocol by selecting

CONFIG, Netw. options, Dial Line, Switch protocl.

B.Ensure the line quality is satisfactory by checking for near- and far-end block errors (NEBEs and FEBEs). To do this, select Test, NEBE/FEBE. If the counts are non-zero and incrementing, there may be a physical link problem as described under Link Down (Step 3).

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

D.With the ISU 128 connected to the 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 terminal endpoint identifier (TEI). Ask them to check the ISDN line translation and ensure that the ISDN line supports dynamic TEI allocation. Tell them that you have an NT1 and terminal adapter device connected to the line.

61202.029L2-1

ISU 128 User Manual

79

Page 93 Page 95
Page 94
Image 94
ADTRAN ISU 128 user manual CONFIG, Netw. options, Dial Line, Switch protocl
Page 93 Page 95

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.
Top Page Image Contents