Single Span Series 24- and 30-Port Voice Processing Plus T-1/E-1 ISDN PRI Boards

Features and Benefits

Enabling Services for the Next Generation Network - The Next Generation Network (NGN) is poised to make business communications systems dramatically more efficient, convenient, and cost-effective.

Applications

Model Voice Ports Interface Form Factor Resource Bus OS Support Connector Type

D240SC-T1 24 On-board DSX-1 PC AT ISA SCbus or PEB MS-DOS, OS/2,UNIX, Windows NT & 2000 RJ-48C

D/240PCI-T1 24 On-board DSX-1 PCI SCbus/CT Bus UNIX,
Windows NT & 2000 RJ-48C

SingleSpan boards are available in both ISA and PCI form factors. PCI models incorporate a CT Bus connector that supports SCbus operation and H.100 operation.

Onboard DSPs provide variable voice encoding at bit rates of 24 and 32 Kb/s for adaptive differential pulse code modulation (ADPCM) and bit rates of 48 and 64 Kb/s µ-law or A-law for pulse code modulation (PCM). Sampling rates and coding methods are selectable on a channel-by-channel basis. Applications may 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.

A rich set of advanced features are supported, including DSP technology and signal processing algorithms for building the core of any CT system. You can integrate voice products easily into exactly the type of system you require

In real time, on all channels, SingleSpan voice boards can:

SingleSpan E-1/T-1 Capabilities

SingleSpan boards are used to develop sophisticated, multifunction CT systems incorporating capabilities such as voice processing, text-to-speech (TTS), and automatic speech recognition (ASR). SingleSpan boards share a common hardware and firmware architecture with other boards based on the SCbus for maximum flexibility and scalability. Features can be added or systems can grow while protecting investment in hardware and application code. With only minimum modifications, applications can be easily ported to lower or higher line-density platforms.

SingleSpan PCI boards install in any PCI-based personal computer or server (PCI bus or mixed PCI/ISA bus) and compatible computers (Intel x86, Digital AlphaServer, or Sun UltraSparc). Each board occupies a single expansion slot and up to 16 boards can be configured in a system.

SingleSpan ISA boards install in IBM PC AT® and compatible computers (Intel386, Intel486, and Pentium processor-based PC platforms). Each board occupies a single expansion slot and up to 16 boards can be configured in a system with each board sharing the same interrupt level.

In either case, PCI or ISA, the number of boards and channels supported depends on the operating system used. The maximum number of lines that can be supported depends on the application, the amount of disk I/O required, and the host computer's CPU(s) and power supply.

SingleSpan boards can operate in either terminate or drop and insert configurations. In a terminate configuration, the board handles the call processing of the digital audio and telephony signaling. If additional resources, such as facsimile, TTS, or ASR are required, the resources can be switched to the call via the SCbus. A SingleSpan board installed as a terminating device eliminates the need for a channel bank. No external channel bank is required and the system operates as a standalone call-processing node.

In a drop and insert configuration, a SingleSpan board and a DTI board are connected via the SCbus and continuously pass all T-1 or E-1 time slots through to each other. This configuration can join two separate T-1 or E-1 lines, or it can be placed in-line between a T-1 or E-1 line and a switch (a PBX, for example). Calls on individual channels can either terminate at a call processing resource on the SingleSpan board, or "flow through" transparently from the SingleSpan board to the DTI board.

ISDN-PRI Support

The ISDN Primary Rate Interface (PRI) firmware is a feature enhancement to the Voice and Switching Products Series. The 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:

SingleSpan PCI models are supported by System Software and Software Development Kits for UNIX®, and Windows NT®. SingleSpan ISA models are supported by System Software and Software Development Kits for MS-DOS®, OS/2®, UNIX, and Windows NT. These packages contain a set of tools for developing complex multichannel applications.

SingleSpan boards can use GlobalCall, a call control interface that simplifies the development and use of compelled R2 and other special signaling protocols.

For added flexibility, the D/240SC-T1 and D/300SC-E1 boards are also supported in CT Media™ telephony server software. This resource management software makes application development easier, and lets applications from different suppliers written to standard application programming interfaces APIs like ECTF S.100 and TAPI to work together on a single server. CT Media server software 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 software 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 SingleSpan 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 Descriptions of
D/240SC-T1 and D/240PCI-T1

Both the D/240SC-T1 and D/240PCI-T1 boards connect directly to a channel service unit (CSU), digital service unit (DSU), or to other network terminating equipment. The CSU chosen must support the D4 or ESF (within ISDN) superframe format. Most functions traditionally performed by a DSU (such as unipolar to bipolar format conversion, framing, etc.) are performed by the D/240SC-T1 or D/240PCI-T1 board. The only exception is the ability to interpret certain bipolar violation patterns, such as loopback start and stop commands from the T-1 network.

Both boards process the digital on-hook/off-hook signaling information and digital voice signals from the telephone network. Digital T-1 signals enter the board via a T1XC line interface (see block diagrams). The line interface contains a software switchable clock which can be set to:

D/240SC-T1

The incoming T-1 bit stream is applied to an SC2000 chip that acts as a traffic coordinator for each channel and as an interface to the SCbus. This serial bit stream contains the digitized voice data and the signaling information for the incoming call.

Each of three SC2000 chips on the D/240SC-T1 board (or two in the case of the D/240PCI-T1 board) transmit several lower speed data streams over a single high-speed channel. The bus configuration is set when the firmware is downloaded at system initialization. These chips incorporate matrix switching capabilities. Under control of an onboard control processor, an SC2000 chip can connect a call being processed or an available external resource to any of the 1024 SCbus time slots. (The D/240SC-T1 board can also connect to 24 PCM Expansion Bus PEB time slots.) This lets the application to route calls to any added resource, such as fax, TTS, or ASR.

D/240PCI-T1

A DSP resource receives digital voice data via an SC2000 module. The DSP processes the digitized voice data based on SpringWare firmware loaded in its high-speed RAM. Each DSP performs the following signal analysis and operations on this incoming data:

For SCbus configurations, the internal local bus operate at 2.048 Mb/s. For D/240SC-T1 PEB configurations, the external PEB and the internal local bus operate at 1.544 Mb/s.

The High-Level Data Link Controller (HDLC) formats ISDN data. The HDLC receives ISDN signaling data from the T1XC interface and the Enhanced Network Interface ASIC (ENIA) and makes it available to the control processor. It also formats and sends outbound signaling data from the control processor to the network interface through the ENIA ASIC and T1XC transceiver chip.

The onboard control processor(s) controls all operations of the board via a local bus and interprets and executes commands from the host PC. These processors handle real-time events, manage data flow to the host PC to provide faster system response time, reduce PC host processing demands, process DTMF and telephony signaling before passing them to the application, and free the DSPs to perform signal processing.

Communications between a processor and the host PC is via the shared RAM that acts as an input/output buffer and thus increases the efficiency of disk file transfers. This RAM interfaces to the host PC via the ISA bus in the case of the D/240SC-T1 board or the PCI bus in the case of the D/240PCI-T1 board. All operations are interrupt-driven to meet the demands of real-time systems. When the system is initialized, SpringWare firmware is downloaded from the host PC to the onboard code/data RAM and DSP RAM to control all board operations. This downloadable firmware gives the board all of its intelligence and lets easy feature enhancement and upgrades.

The Traffic Controller ASIC is the Intel486 control processor interface that handles all peripheral devices (SC2000, HDLC, DSPs, T1XC) and host PC functions (Board Locator Technology, programmable interrupts, and shared RAM). The Board Locator Technology circuit inside the Traffic Controller ASIC operates in conjunction with a rotary switch, eliminating the need to set confusing jumpers or DIP switches. The Board Locator Technology is used to map all T-1 boards' shared RAM to the same PC memory space.

Technical Specifications for D/240SC-T1

*All specifications are subject to change without notice.
**Configurable to meet country specific PTT requirements.

Actual specification may vary from country to country for approved products.

Hardware System Requirements for

D/240SC-T1:

Multidrop PEB and SCbus cables(86-0055-001 [2-drop] to -008 [9-drop])

Additional Components for D/240PCI-T1

Multidrop SCbus or CT Bus cables and CT Bus/SCbus Adapter