Chapter 6. Configuration

To exit the data mode and enter the command mode, the asynchronous DTE device must transmit a proper escape sequence to the ISU 128. A specified time delay must occur between the last data character and the first escape se- quence character. This is the guard time delay, and it can be changed by writ- ing a value to the S12 register. The default value for the guard time is one second. For a valid escape sequence to occur, the DTE must transmit the es- cape code character three times in succession with delay between each charac- ter being less than the guard time. The default escape sequence is +++.

Once the command mode is entered, AT commands can be transmitted to the ISU 128 to configure most of the options, dial remote DSUs, or initiate tests to check both the ISU 128 and the network connections. All command lines must begin with the AT character set in either capital or lower case letters and end with a terminating character. A command line can be terminated at any time by transmitting the Ctl-X(ASCII 018) after the AT attention code. The ISU 128 ignores this command line and issues an OK response.

The command line may contain a single command or a series of commands af- ter the AT attention code. When a series of commands are used, the individual commands may be separated with spaces for readability. The maximum length for a command line is 40 characters. Each command line is executed by the ISU 128 upon receipt of a terminating character.

The default terminating character is a carriage return (ASCII 013), but it can be changed by writing a different value to register S3. Before the terminating character is transmitted, the command line can be edited by using the back- space character (ASCII 008) to erase errors so the proper commands can be en- tered. Examples of using AT commands are provided in this section.

Using AT Commands

Type AT followed by the letter of the command and numeric value of the set- ting desired and then press Enter. The following command returns the soft- ware version of the unit:

ATI1

Using S-Registers

The configuration of the ISU 128 can be changed and/or reviewed with S-reg- isters. See the appendix S-Register List for a description of each S-register and its corresponding range of values.

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ADTRAN ISU 128 user manual Using AT Commands, Using S-Registers
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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.
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