Chapter 7. Protocol Options

DSU 57.6 ASYNC

The DSU 57.6 ASYNC or DSTOP protocol allows the ISU 128 to communicate asynchronously at 57.6 kbps with ADTRAN 2- and 4-wire Switched 56 DSU products. In addition, the ISU 128 will communicate with other ISUs over dial and leased connections using this protocol. Figure 7-1 illustrates the menu path for setting the DSU 57.6 ASYNC protocol.

T-Link

The T-Linkprotocol allows the ISU 128 to communicate with 2-wire Switched 56 DataPath Data Units (DUs) such as the ADTRAN DSU III 52W. The T-Link protocol performs two functions:

The T-link protocol adapts DTE data subrates of 64 kbps to the 64 kbps bandwidth of the ISDN bearer channel.

For asynchronous and synchronous DTE rates up to 19.2 kbps, T-Linktransmits the status of the DCE-DTE EIA leads to facilitate flow control and maintenance.

In addition to 2-wire Switched 56 DataPath DUs, the ISU 128 can communicate with any other device that uses the T-Link protocol. Figure 7-1 shows the menu path for selecting T-Link.

Simple ADTRAN Protocol (SAP)

Simple ADTRAN Protocol (SAP) is a rate adaption method providing DTE service between ISU 128 units at a sub 64 kbps ISDN bearer channel rate. Se- lecting this menu item causes the ISU 128 to use SAP protocol.

The primary usage for SAP is general purpose asynchronous rate adaption in a dial-up or leased environment. SAP only operates on a 64 kbps data link. See Figure 7-2 for the menu path to select SAP.

61202.029L2-1

ISU 128 User Manual

53

Page 68
Image 68
ADTRAN ISU 128 user manual DSU 57.6 Async, Link, Simple Adtran Protocol SAP

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.