Dialogic DTI/SC Series

High Density T-1/E-1 ISDN Network Interface Boards

Features and Benefits

• Single and dual 1.544 Mb/s, T-1 digital interface or 2.048 Mb/s, E-1 digital interface with ISDN Primary Rate connectivity in CT systems based on the SCbus
• SCbus' distributed switching permits inbound/outbound call re-routing, both inter-board as well as intra-board
• DS-1 D3/D4 channel bank functions are compatible with DSX-1 line interface devices and reduces telephone line costs by using digital circuits
• ANI and DNIS device access, using network-based services, offers additional application possibilities
• Signaling and maintenance functions are controlled and monitored through the host PC and handle T-1 protocols including E&M, loop start, FSX, and FXO
• Optional tone signaling and outbound Call Progress Analysis through a subset of downloadable signal and call Processing Firmware, SpringWare
• Supports ISDN

Applications

• Call center
• Telemarketing
• Voice/audio response systems
• Predictive dialer
• Automated call rerouting applications (debit card, international callback, long distance resale)
• Wireless gateway
• Programmable switches
• Audiotex
• Operator services
• Test equipment
• Protocol conversion equipment

The Intel® Dialogic® DTI/SC Series boards are designed to provide a powerful set of advanced call processing features that developers can use to create cost-efficient, high-port-density systems. This series provides digital telephone network service termination for computer telephony systems based on the SCbus.

24/48 (T-1 boards) or 30/60 (E-1 boards) ports of voice and data information in single- or dual-span configurations are passed in real time between the digital telephone network and the SCbus. These boards terminate T-1/DSX-1 (1.544 Mb/s) or E-1/DSX (2.048 Mb/s). Optional DSP-based tone signaling, including out-bound call progress analysis, is available. The DTI/SC Series are ISA AT form factor boards that install in a single 16-bit expansion slot.

The T-1 DTI/SC boards also support Robbed-Bit Signaling, and are fully compatible with resource devices that use or can be set to use 1.544-MHz clocking and µ-law pulse code modulation (PCM). All basic channel associated signaling (CAS) functions are supported such as pulse dialing and detection, winking and flash.

The E-1 DTI/SC boards support CEPT channel associated signaling protocol and are fully compatible with interface devices that use or can be set to use 2.048 MHz clocking and A-law pulse code modulation (PCM). R2/MF Compelled Protocol is also supported. All CAS functions are supported such as pulse dialing and detection, winking, and flash.

The DTI/SC Series supports the ISDN Primary Rate Interface (PRI) Access downloadable firmware that enables SCbus applications to use the speed, power and flexibility of ISDN.

The Intel® Dialogic® DTI/241SC and DTI/301SC models contain an additional digital signal processor (DSP) daughterboard that provides a broad range of tone signaling capabilities. The added features are actually a subset of SpringWare voice processing algorithms. This subset is downloaded to the on-board DSPs on system initialization and provides 24 (T-1) or 30 (E-1) channels of nonblocked access to tone signaling and outbound call progress analysis.

Configurations

Multiple DTI/SC boards can be configured in a system with each board sharing the same interrupt level. The maximum number of lines supported is dependent on the application, the amount of disk I/O required, and the host computer CPU and power supply.

The distributed switching architecture of the SCbus provides for a high degree of flexibility when configuring systems. Any of the time slots from the network can be routed to any of the SCbus' 1024 time slots. An incoming call on one time slot of the network interface can be rerouted to an outbound call on another time slot.

The tone resources on the DTI/241SC and DTI/301SC boards are physically independent of the network interface resources, even though they are co-located on the same board level product. Many applications will conveniently assign the tone resources on a one-to-one basis with the network ports. However, these tone resources can be dynamically switched to service other trunk and station interface resources in the system.

DTI/241SC Configuration Example
48 X 96 Call Center System

ISDN PRI Support

The ISDN access firmware is a feature enhancement to the Intel® Dialogic® DIALOG/HD Voice and Switching Products Series. This PRI firmware has been approved for use with many popular protocols and in major markets.

Features and benefits of ISDN PRI may include (if available on your network) may include:

• ISDN Primary Rate connectivity to CT systems
• Downloadable firmware for DTI/SC Series boards yields a cost-efficient, single-slot adapter solution
• Dialed Number Identification Service (DNIS) letting the application to automatically identify the purpose of the incoming call
• Automatic Number Identification (ANI) letting the application identify the calling party
• ANI-on-Demand feature that saves money by selectively requesting ANI information only when needed
• ISDN, offering inherent benefits to call center applications with its fast call setup and fast retrieval of DNIS and ANI information on inbound calls
• Vari-A-Bill enabling service bureaus to change the billing rate of a 900 call, on the fly
• Call-By-Call Service Selection that allows an application to select the most efficient bearer channel service on a call-by-call basis
• Non-Facility Associated Signaling (NFAS) saving on D channel expenses by letting multiple spans to be controlled by a single D channel (using selected models of the DTI/SC Series)
• Subaddressing, which allows direct connection to individual extensions or devices sharing the same phone number, or, as a proprietary messaging mechanism
• Powerful and universal software application programming interface API to simplify access for developers who are unfamiliar with ISDN, while enabling sophisticated control of features
• Multinational approvals with many popular protocols
• User-to-User Information which lets an application to send proprietary messages to remote systems during call establishment
• The ability to transmit and receive any Information element; lets application implement public or proprietary supplementary services
• Other ISDN messages, such as Facility and other optional information elements allow applications work with network-specific supplementary services such as PRI Transfer
• The optional Layer 2 access setting, which lets applications execute proprietary protocols or to control their own Q.931 stack through direct access to the LAP-D frames

Software Support

The DTI/SC boards are supported by System Software and SDKs for MS-DOS*, OS/2*, UNIX*, and Windows NT* operating system environments. These packages contain a set of tools for developing complex multichannel applications. See the table at the top of this data sheet for the operating system platforms each model supports.

Functional Description

T-1 interface DTI/SC boards can be connected directly to a channel service unit (CSU), digital service unit (DSU) or to other network terminating equipment. The CSU chosen must support the D4 superframe format. Most functions traditionally performed by a DSU (such as unipolar to bipolar format conversion, framing, etc.) are performed by the DTI/SC 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.

DTI/SC boards process digital signaling information and voice signals from the telephone network. Digital T-1 or E-1 signals from the telephone network enter the DTI/SC board via a T1XC or E1XC line interface (see block diagrams). The line interface extracts or inserts telephony signaling information, which an on-board control processor processes.

The line interface contains a software switchable clock (at initialization), which can be set to

• Loop (clocking is slaved to the external network)
• Independent (clocking is derived from an on-board oscillator)
• Expansion (clocking is slaved to another network interface board)

On E-1 interface boards the line interface also supports CRC4 (Cyclic Redundancy Check).

D/241SC Example - T-1 Interface with Tone Processing

DTI/600SC Example - E-1 Interface, No Tone Processing

The incoming bit stream is applied to an SC2000 chip, which acts as a traffic coordinator for each channel and provides an interface to the SCbus. The serial bit stream contains the digitized voice data and signaling information for the incoming call.

The on-board SC2000 chips transmit several lower-speed data streams over a single high-speed channel. These chips incorporate matrix switching capabilities. Under control of an on-board control processor, an SC2000 chip can connect a call being processed or an available external resource to any of the 1,024 SCbus time slots. This lets the application to route calls to any added resource, such as speech recognition, facsimile, or text-to-speech (TTS).

On the Intel® Dialogic® DTI/241SC and DTI/301SC boards, each of the DSP resources receive digital data via an SC2000 chip. The DSP processes the digitized tone data based on Spring Ware firmware loaded in code/data RAM. Each DSP performs the following signal analysis and operations on the incoming data:

• Detects the presence of tones — DTMF, MF, or an application-defined single or dual tone
• Detects silence to determine whether the line is quiet and the caller is not responding

For outbound data:

• Generates tones — DTMF, MF, or any application-defined general purpose tone

The dual-processor combination also performs outbound dialing and call progress monitoring:

• Transmits an off-hook signal to the telephone network
• Dials out (makes an outbound call)
• Monitors and reports results: line busy or congested; operator intercept; ring no answer; or if the call is answered, whether answered by a person, an answering machine, a facsimile, or a modem.

An SC2000 chip can bundle time slots to carry high bandwidth data and broadcast to multiple resources over the SCbus.

The external SCbus operates at 4 Mb/s and the internal local bus operates at 2.048 Mb/s.

A pair of High-level Data Link Controllers (HDLC) control access to a SCbus message bus. This message bus is a separate SCbus channel that carries messages and control information between devices, such as out-of-band signaling and collision detection and resolution. Out-of-band signaling enables faster response time to the messages and control information carried on the dedicated message channel. Bus contention and resolution capability uses a set of fixed and rotating guidelines to detect when two devices are trying to access the same SCbus slot and resolves these situations so that each resource has equal access to the SCbus.

The on-board control processors control all operations of the DTI/SC board via a local bus and interpret and execute 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, where implemented, free the DSPs to perform signal processing. Communications between a processor and the host PC is via shared RAM, which 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. All operations are interrupt-driven to meet the demands of real-time systems. When the system is initialized, SpringWare firmware to control all board operations is downloaded from the host PC to the on-board code/data RAM and DSP RAM. This downloadable firmware gives the board all of its intelligence and enables easy feature enhancement and upgrades.

The Board Locator Technology circuit operates in conjunction with a rotary switch eliminating the need to set confusing jumpers or DIP switches.

DTI/SC Technical Specifications*

DTI Series SpringWare Firmware Technical Specifications*

Hardware System Requirements

• Intel®386, Intel®486 or Pentium® processor IBM PC AT (ISA) bus or compatible computer depending on operating system requirements.
• Operating system hardware requirements vary according to the number of channels being used.

Additional Components

• Multidrop SCbus cable
  — 4 drop (86-0081-104)
  — 8 drop (86-0081-108)
  — 12 drop (86-0081-112)
  — 16 drop (86-0081-116)
  

• 2-to-9 drop PEB cable [86-0055-001 (2 drop) to -008 (9 drop)]
• Crossover PEB cable:
  — a male-to-female PEB crossover cable (86-0057-001)
  — a male-to-male PEB crossover cable (86-0056-001)
  

*All company names, products, and services mentioned are the trademarks or registered trademarks of their respective owners
00-2948-002