Chapter 7. Protocol Options

When originating calls to unknown units, the ISU begins protocol selection based on the local call type. Data 64k is used for FALLBACK selected from Quick Setup menu. Upon connection at 64k call type, BONDING, V.120, and

PPPare attempted. If connection is not made at 64k, the ISU 128 attempts an- other call at 56k call type. If connection is made at 56k, then V.120, T-Link, and PPP are attempted. If connection is not made at 56k, then an audio call type is attempted, provided the ISU 128 with the V.34 modem option is used. If the ISU connects the audio call type, the V.34 protocol is attempted for V.34 com- patible modems. Once a call connects, if the protocol cannot be negotiated, the protocol is negotiated as specified by S11 register (default is DSTOP). If this protocol fails, the call is disconnected.

If FALLBACK fails to determine which protocol is running, the user has the option to select which protocol will run. Figure 7-6 illustrates the FALLBACK default settings.

3=CONFIG

1=Clear Channel

 

1=Netw. options

 

 

 

 

2=BONDING mode 1

 

 

 

 

 

 

 

 

 

 

 

2=DTE options

 

 

 

 

3=V.120

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=Protocol

 

 

 

 

4=V.34

 

 

 

4=Quick setup

 

 

 

 

5=V.110

 

 

 

5=Remote config

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6=DSU 57.6 ASYNC

 

 

 

 

 

 

 

 

7=T-LINK

 

 

 

 

 

 

 

 

8=SAP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

9=FALLBACK

 

 

1=Fallback Def.

 

 

 

 

 

 

0=PPP asyn-sync

 

 

1=Clear Channel

2=BONDING Mode 1

3=V.120

4=V.34

5=V.110

6=DSU 57.6 ASYNC

7=T-LINK

8=SAP

9=PPP asyn-sync

Figure 7-6

FALLBACK Menu Tree

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ISU 128 User Manual

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ADTRAN ISU 128 user manual Fallback Menu Tree, =Protocol =V.34

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.