Appendix A. AT Commands

Command Function

Carrier Detect (CD) Control Line Options

&C0

CD forced On

&C1

CD normal

&C2

CD off with local disconnect (LOCD)

&C3

CD off with link down

Data Terminal Ready (DTR Control Line Options)

&D0

Ignore DTR

&D1

DTR off forces command

&D2

Idle when off, DTR off forces idle (On allows auto answer)

Generic Unit Configurations

&F0

Reset all S-registers to factory preset values

&F1

Configures unit for Dial 56K sync

&F2

Configures unit for Dial 64K sync

&F3

Configures unit for Dial 112K sync

&F4

Configures unit for Dial 128K sync

&F5

Configures unit for Leased 128K

&F6

Configures unit for Ldm 128K master

&F7

Configures unit for Dial 57.6K async

&F8

Configures unit for Dial 115.2K async

&F9

Configures unit for Dial PPP

&F10

Configures unit for Dial V34 115.2 async

&F11

Configures unit for FALLBACK 57.6K async

Network Options

 

&L0

Dial network

&L1

Leased network

Calling Number Identifiers

&N0

Number 1. Read far-end phone number 1 if service subscribed from

 

telephone company.

&N1

Number 2. Read far-end phone number 2 if service subscribed from

 

telephone company.

DTE Data Type Options

&Q0

DTE is async

&Q1

DTE is sync

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ISU 128 User Manual

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ADTRAN ISU 128 user manual Carrier Detect CD Control Line Options
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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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