Chapter 6. Configuration

V.25 bis

Configuring the ISU 128 for V.25 bis (see Figure 6-5) enables in-band dialing over a DTE interface using asynchronous or synchronous V.25 bis commands. V.25 bis can be used to establish and end a call. Disconnecting calls can also be done from the front panel (as previously described) or from the far-end unit.

V.25 bis dialing is used primarily by DTE with synchronous interfaces (HDLC/SDLC or BSC/BISYNC) not supporting the AT command set, which is commonly used by asynchronous devices. The ISU 128 supports V.25 bis in- band dialing in accordance with Fascicle VIII.I - V.25 bis (Malaga-Torremoli-

nos 1984, Melbourne 1988).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1=Dial Line

 

 

 

 

 

 

 

 

 

 

 

 

 

1=Netw. options

 

 

2=Leased Line

 

 

3=CONFIG

 

2=DTE options

 

 

 

 

 

 

 

 

 

 

 

3=Protocol

 

 

 

 

 

 

 

4=Quick setup

 

 

 

 

 

 

 

5=Remote config

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1=Switch protocl

 

 

 

2=Call type

1=Front Panel

 

3=Terminal ID

 

2=RS-366

 

 

 

 

4=Dial options

 

 

 

3=AT commands

 

5=Auto answer

 

4=V.25

 

1=V.25 HDLC

6=Answer tone

 

5=Disabled

2=V.25 ASYNC

7=Connect Timout

 

 

3=V.25 BISYNC

8=Call Screening

 

 

 

 

4=V.25 HDLC FLAG

 

 

 

 

Figure 6-5

Dial Options, V.25 bis Menu Tree

Recommendation V.25 uses the following DCE/DTE control signals:

Transmitted data

circuit 103

Received data

circuit 104

Ready for sending

circuit 106

Data set ready

circuit 107

Data terminal ready

circuit 108/2

Calling indicator

circuit 125

The ISU 128 supports the following V.25 bis commands to control automatic calling and answering:

CRN

call request (number in command)

CRS

call request (using stored number)

PRN

program stored number

RLN

list stored number

CIC

connect incoming call

DIC

disconnect incoming call

61202.029L2-1

ISU 128 User Manual

33

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Image 48
ADTRAN ISU 128 user manual Dial Options, V.25 bis Menu Tree
Page 47 Page 49

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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