Appendix C. Status Buffer Messages

S cmd not = or ?

User did not use proper syntax.

SAP idle timeout

Unit at far end is not configured to use the SAP protocol.

SERVICE_NOT_AVAIL

The service requested by the user is not available.

SOURCE NOT ISDN

The incoming calling party is not ISDN (warning only).

SReg SetError

Local DTE invalid S-register setting.

Sync BPS < 56K

The synchronous bit rate selected is too slow for the BONDING protocol.

Sync Mismatch

Both ends Bad Synchronization.

TAINIT expired

Bonding timer TAINIT expired.

TANULL expired

Bonding timer TANULL expired, non-BONDING equipment attempted to call into the ISU 128 while optioned for BONDING.

TEMPORARY_FAILURE

The network has temporarily failed, try the call again.

TIMER_EXPIRY

Call control error.

TLINK ErrorOne

Catastrophic TLINK error.

TXADD01 expired

Bonding timer TXADD01 expired, probably making a long distance call to a foreign country, adjust timer value to correct.

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ISU 128 User Manual

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ADTRAN ISU 128 user manual Servicenotavail, Source not Isdn, Temporaryfailure, Timerexpiry

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.