4 Configuration and Operation

4.7.1Switching Model

The basic switching model assumes that at system initialization all incoming T1/E1 timeslots and all resource board output timeslots are connected up to channels on the CT bus and that these connections are never changed. This has the advantage that once the on-board CT bus drivers have been set up they are never changed so the chances of inadvertently causing CT bus conflict is minimized. It also means that the user can predict the exact CT bus channels where any input timeslot can be located and this in turn can assist with fault diagnosis and general system test.

It is also possible to generate fixed patterns on any T1/E1 output timeslots to provide the correct idle pattern for presentation to the network on all circuits where there is no active call.

Having completed the system initialization, all drives to the CT bus are set up. Then, on a dynamic (call by call) basis, the connectivity must be modified when a new call arrives and when it finishes.

When a new call arrives, the application, in general, needs to initiate two listen commands. One command causes the resource to listen to the appropriate CT bus channel to hear the incoming voice path and the other causes the T1/E1 interface to listen to the output from the resource board to generate the outgoing voice path.

When a call clears, the application needs to initiate generation of the fixed idle pattern towards the network operation (and may wish to connect an idle pattern to the resource board).

4.7.2Static Initialization

Static initialization is handled by the s7_mgt utility. For each T1/E1 line interface unit, user must include an LIU_SC_DRIVE command in the config.txt file. The syntax for this command is detailed in appendix A.

The LIU_SC_DRIVE command has several parameters. board_id and

liu_id together uniquely identify the affected line interface unit. sc_channel is the channel number of the first channel on the CT bus that is to be used for timeslots from the specified LIU. ts_mask is a mask identifying which timeslots on the T1/E1 interface are carrying voice circuits (as opposed to signaling) and therefore need to be connected to the CT bus. The least significant bit of ts_mask must always be zero when driving from an T1/E1 interface.

As an example, consider a two board system where the first board has 4 E1 ports and the second board has 4 T1 ports. We allow the first 512 CT bus channels to be used by other boards in the system and therefore start at sc_channel 512.

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Dialogic DSI SPCI Network Interface Boards manual Switching Model, Static Initialization
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DSI SPCI Network Interface Boards specifications

Dialogic DSI SPCI Network Interface Boards are highly advanced and versatile communication solutions tailored for the demands of modern telephony and multimedia applications. These boards are designed to efficiently process voice, data, and signaling, making them an essential component for businesses looking to enhance their communication capabilities.

One of the standout features of the Dialogic DSI SPCI boards is their ability to handle multiple telephony protocols. This flexibility allows users to connect to various network types, whether PSTN, VoIP, or legacy systems, ensuring seamless interoperability. The boards support industry-standard protocols such as ISDN, SS7, and SIP, enabling integrated communication across diverse platforms.

The technology behind the Dialogic DSI SPCI boards incorporates state-of-the-art digital signal processing (DSP). This powerful DSP architecture provides efficient encoding and decoding of voice and video signals, leading to enhanced call quality and reduced latency. Moreover, the DSP technology supports advanced codecs, ensuring that voice communication is clear and intelligible, even over bandwidth-limited connections.

Another significant characteristic of these boards is their scalability. Organizations can start with a single board and expand their telecommunication capabilities as their needs grow. This scalability makes them suitable for a wide range of applications, from small businesses to large enterprises, allowing for easy integration into existing infrastructures.

In addition to their powerful processing capabilities, Dialogic DSI SPCI boards also prioritize reliability and robustness. They are designed with a focus on fault tolerance, ensuring that telephony services remain uninterrupted even in the event of hardware failure. This resilience is critical for mission-critical applications where downtime can lead to significant revenue loss.

Furthermore, the boards feature extensive application development support. Developers can leverage the Dialogic API and various development kits to create custom telephony applications that meet specific business requirements. This programmability opens the door to innovative solutions, such as interactive voice response (IVR) systems, automated call distribution (ACD), and customer relationship management (CRM) integration.

In summary, Dialogic DSI SPCI Network Interface Boards are a cornerstone for organizations looking to innovate their telecommunication systems. With their support for multiple protocols, advanced DSP technology, scalability, reliability, and development support, these boards empower businesses to optimize their communication strategies and adapt to the evolving landscape of digital interaction.
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