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| DualSpan Series
Voice Processing and T-1/E-1 ISDN PRI Boards
Features and Benefits
Applications
The DualSpan™ Series of digital voice and network interface boards provide two E-1 or T-1 ISDN Primary Rate Interface lines of service termination and call processing for 30 or 60 voice channels (E-1 boards) or 24 or 48 channels (T-1 boards) in a single PC slot. Functionally, the DualSpan boards are equivalent to two single-span boards, such as the D/300SC-E1 or D/240SC-T1, combined into one single-slot ISA board. A unique multiprocessor architecture comprising digital signal processors (DSPs) and general purpose microprocessors handles all telephony signaling and performs all DTMF, MF, and audio/voice signal processing tasks. The DualSpan boards, as members of the DIALOG/HD™ High Density Voice and Switching Products Series, are based upon Signal Computing System Architecture™ (SCSA™). SCSA provides an open architecture that enables developers to use products from multiple vendors to build a unified computer telephony solution. SCSA provides features such as distributed switching, logical addressing, and location independent resource management. Downloaded firmware algorithms, SpringWare™, executed by the on-board DSPs, provide variable voice coding at 24 and 32 Kb/s ADPCM, toll quality G.726 ADPCM at 32 Kb/s, and 48 and 64 Kb/s µ-law or A-law PCM. Sampling rates and coding methods are selectable on a channel-by-channel basis. Applications can dynamically switch sampling rate and coding method to optimize data storage or voice quality as the need arises. SpringWare firmware also provides reliable DTMF detection, DTMF cut-through, and talk off/play off suppression over a wide variety of telephone line conditions. Dialogic voice products offer a rich set of advanced features, including state-of-the-art DSP technology and signal processing algorithms, for building the core of any computer telephony system. With industry-standard ISA bus expansion boards and a variety of channel densities to choose from, you can integrate Dialogic voice products easily into exactly the type of system you require at a price and performance level unmatched in the computer telephony industry. In real time on all channels, DualSpan voice boards
Use DualSpan boards to develop sophisticated, multifunction computer telephony systems incorporating capabilities such as voice processing, speech recognition, and text-to-speech. The DualSpan boards share a common hardware and firmware architecture with other Dialogic SCbus™ boards for maximum flexibility and scalability. Add features or grow the system while protecting your investment in hardware and application code. Applications can be ported easily to lower or higher line-density platforms with only minimum modifications. The DualSpan boards install in IBM® PC AT® (ISA bus) and compatible computers (80386, 80486, and Pentium™-based PC platforms). A DualSpan board occupies a single expansion slot. Up to 16 boards can be configured in a system with each board sharing the same interrupt level. The number of boards and channels supported depends on the operating system used. The maximum number of lines that can be supported is dependent on the application, the amount of disk I/O required, and the host computer CPU and power supply. DualSpan boards can operate in either terminate or drop-and-insert configurations. In a terminate configuration, the DualSpan board handles the call processing of the digital audio and telephony signaling. If additional resources such as automatic speech recognition (ASR), facsimile, or text-to-speech (TTS) are required, the resources can be switched to the call via the SCbus. When a DualSpan board is installed as a terminating device, no external channel bank is required and the system operates as a standalone call-processing node. In a drop-and-insert configuration, the two E-1 or T-1 interfaces
on the DualSpan board are connected via the SCbus and continuously pass
all network interface time slots through to each other. This configuration
can join two separate network interface lines or it can be placed in-line,
between an E-1 or T-1 line and a switch (a PBX, for example). Calls on
individual E-1 or T-1 channels can either terminate at one of the call
processing resources on board or "flow through" transparently from the
"upstream" E-1/T-1 interface to the "downstream" interface. In this configuration,
the 24 (T-1) or 30 (E-1) ports of voice processing are usually sufficient
to handle the 48 or 60 ports of T-1 or E-1 interface. The D/240SC-2T1 and
D/300SC-2E1 boards are ideal for drop-and-insert configurations such as
those used in call completion and call routing applications.
D/300SC-2E1 Configuration Example
D/480SC-2T1 Configuration Example DualSpan boards enable you to expand a system with minimal impact on existing applications. A D/600SC-2E1 board, for example, can replace two D/300SC-E1 single-span boards without requiring changes to the application software. ISDN PRI Support Dialogic ISDN Primary Rate Interface (PRI) Access Firmware is a feature enhancement to the DIALOG/HD Voice and Switching Products Series. Dialogic PRI Firmware is approved for use with many popular protocols in major markets, based on both T-1 (1.544 Mb/s) and E-1 (2.048 Mb/s) physical interfaces. Features and benefits of ISDN PRI include
DIALOG/HD DualSpan boards are supported by Dialogic System Software and Software Development Kits for MS-DOS®, Windows NT®, and UNIX® operating system environments. These packages contain a set of tools for developing complex multichannel applications. For added flexibility, the DualSpan ISA-based boards are also supported in Dialogic CT Media. This resource management software makes application development easier, and enables applications from different suppliers written to standard APIs like ECTF S.100 and TAPI to work together on a single server. CT Media makes this possible by managing technology resources (boards and host-based technologies) within the server, and providing basic switching functions to multiple client applications. CT Media runs on Windows NT 4.0. A minimum of 24 MB should be used in any field-deployable system with 64 MB or more recommended. A Pentium™-class processor is recommended, as is a fast (i.e., SCSI II) disk I/O system. The DualSpan Series supports Boardwatch™, the SNMP-compatible software for remote CT board management. Boardwatch simplifies the management and lowers the total cost of operation of CT devices. These centralized management capabilities provide a single point of configuration and inventory for all network devices. Fault management for high-availability systems includes diagnostics, detection, and recovery capabilities. Functional Description For detailed descriptions and block diagrams, see the D/300SC-E1 or D/240SC-T1 data sheet for analogous single-span E-1 and T-1 functionality. Technical Specifications**
** All specifications are subject to change without notice. DualSpan boards do not support PEB. Hardware System Requirements
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