Features and Benefits

• Flexibility: One, two, or three conferencing resources (DSPs) in a single slot. Each conferencing resource supports up to 32 conferees who can be dynamically assigned to conferences of any size up to a maximum of 32 per conference.

 
• High density: A maximum of 32 active conferees per conference

 
• Monitoring/Broadcasting: A single conference can be monitored by a virtually unlimited number of listeners using the SCbus™ broadcast feature

 
• Active talker status: The capability to determine which conferees are talking at a given time

 
• Reduced noise build-up: Robust algorithm that prevents noise build-up and maintains audio clarity

 
• On-board DTMF detection/clamping: During a conference DTMF tones originated by any conferee can be detected with minimal disturbance to other conferees. This feature does not require any additional voice hardware.

 
• Automatic gain control: Equalizes the volume levels of different conferees

 
• Coaching: Allows one conferee (a coach) to speak privately to another conferee (a pupil) without any of the other conference participants hearing the coach. The coaching facility can be used for training or for private (one-way) messages such as setting up a subconference, for example.

 
• Individual volume control: Lets conferees adjust the listening volume of the conference to their preferred level

 
• SCbus access: High-density systems - up to 1024 time slots - enable customized, integrated applications using a wide range of technologies like station interface, speech recognition, facsimile, and text-to-speech. Build economical systems by sharing resources via the SCbus.

 
• Compatibility: Attach Dialogic digital front-end products such as the DTI/SC™, D/240SC-T1™, and D/300SC-E1™

 
• MSI™ API compatibility: Easy porting of MSI conferencing applications

 
• C language application program interfaces: APIs for Windows NT® and UNIX® (multiple variants) shorten development cycles so you can get your applications to market faster

 
• Board Locator Technology™: Eliminates confusing DIP switch or jumper settings and simplifies installation

 
• Extensibility: Configure multiple boards in a single PC (ISA bus) for easy and cost-effective system expansion on the best computing platform that fits your needs

 

 
 
 

• Chat line
• Business conferencing

 

 Dialogic gives you access to the lucrative business conferencing market, which continues to expand as it moves from proprietary-based systems to open system-based components and is now expanding to the Internet. Many more technologies are available with open system integration than with proprietary systems.

 Configurations

 One board can bridge as many as 96 remote sites, using three separate conference resources that accommodate up to 32 conferees each. In addition, for each of the conference resources which are digital signal processors (DSPs), any of the 32 bridge lines can be routed over the SCbus to thousands of conference listeners, opening up a range of applications supporting large, dial-in audiences.

 Dialogic conferencing boards come with tone signaling, reducing or eliminating the need for additional voice resources when only tone processing is necessary.

 They can be added to existing computer telephony applications, sharing the same media server with email, voice mail, and fax-on-demand, or databases.

In this sample configuration, the board is installed in a server behind a PBX. This system supplies the enterprise not only with audio conferencing capabilities, but also with IVR, voice mail, and fax as well.

 For more information on business conferencing applications, check the Dialogic Web site and the Dialogic On-Line Information Retrieval System (fax-on-demand).

 Software Support

 Dialogic conferencing boards are supported by API libraries for UNIX® and Windows NT® development environments.

 Functional Description

 Dialogic conferencing boards can process 32, 64, or 96 SCbus time slots depending on the number of conferencing resources (DSPs) resident on the board. The DCB320/SC, DCB640/SC and DCB960/SC contain one, two, and three conferencing resources respectively, with each one supporting 32 time slots. (Note: the DCB960/SC consists of a baseboard and daughterboard combination, as shown in the block diagram example).

 Dialogic conferencing boards contain one or more conferencing "subassemblies" consisting of an SC2000, a DSP, and high-speed RAM. These subassemblies are controlled by a single control processor with attendant code/data RAM and serviced by a single HDLC controller and shared RAM. (See block diagram.) Each conferencing subassembly fully manages up to 32 conferees (i.e., SCbus time slots), accessed from digital network interfaces via its SC2000 chip. Each subassembly can maintain up to 16 simultaneous conferences of two conferees each, or conversely all 32 conferees could reside in the same conference. Conferences can be dynamically created, deleted, or modified, up to the conference and conferee limits.

 Each subassembly implements the full suite of conferencing features on its own. 

• Volume Control for any individual conferee. Each party can increase or decrease its volume (reception) by issuing the boardwide selectable DTMF digit. (Note: volume control is activated on a conference-by-conference basis.) 
• DTMF Detection for any conferee (except for those digits serving as volume control digits, if any). Applications can thus determine when/if any conferee has generated a DTMF digit. 
• DTMF Tone Clamping to minimize DTMF tones generated by one conferee from disturbing any other parties. 
• Conference Monitoring for dial-in parties to listen to a conference. 
• Active Talker indication to let an application determine which conferees in any given conference are talking currently. 
• Coaching feature for two selected parties to establish a private "subconference" with respect to the overall conference. 

 The on-board control processor controls all board operations via a local bus and interprets and executes commands from the host PC. The processor handles real-time events, manages data flow to the host PC to provide faster system response time, reduces PC host processing demands, and frees the DSPs to perform conferencing and signal processing functions. 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. All operations are interrupt-driven to meet the demands of real-time systems. When the system is initialized, DCB 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 any jumpers or DIP switches.
 

Technical Specifications*
 
 

CONFIGURATION:
Resource sharing bus	SCbus
Control microprocessor	Intel 80C286 @ 23 MHz
Digital signal processor	1 to 3 Motorola DSP56002 @ 57 MHz, with 32 K word private, 0 wait state SRAM
HOST INTERFACE:
Bus compatibility	IEEE P996 ISA compatible (IBM PC XT/AT)
Bus speed	8 MHz typical
Bus mode	Automatically configures to 8 or 16 bit transfer mode
Shared memory	8 KB page
Base addresses	8000h to E800h, on 32 K boundaries. All Dialogic Board Locator Technology boards share the same base address. Shared memory is page mapped in/out dynamically as needed.
Interrupt level	IRQ 2/9, 3, 4, 5, 6, 7, 10, 11, 12, 14, 15, software selectable. One IRQ is shared by all Dialogic Board Locator Technology boards.
I/O ports	None
CONFERENCING:
Conference resources	1 to 3
Conferees supported per resource	2 to 32
Conferences per resource	1 to 16
Modes	Duplex, monitor, coach, pupil
Notification tones	When enabled by the application, a tone is automatically generated when a caller is added or deleted from a conference and a periodic tone is generated for tariff notification
AUDIO SIGNAL:
Transmit level (weighted average)	-9 dBm0 nominal
Transmit volume control	40 dB adjustment range, with application definable increments and legal limit cap
DTMF TONE DETECTION:
DTMF digits	0 to 9, *, #, A, B, C, D per Bellcore LSSGR Sec 6
Dynamic range	-36 dBm to +3 dBm per tone
Minimum tone duration	40 ms
Interdigit timing	Detects like digits with a >40 ms interdigit delay. Detects different digits with a 0 ms interdigit delay.
Acceptable twist and frequency variation	Meets Bellcore LSSGR Sec 6 and EIA 464 requirements
Noise tolerance	Meets Bellcore LSSGR Sec 6 and EIA 464 requirements for Gaussian, impulse, and power line noise tolerance
Talk off	Detects less than 20 digits while monitoring Bellcore TR-TSY-000763 standard speech tapes (LSSGR requirements specify detecting no more than 470 total digits). Detects 0 digits while monitoring MITEL speech tape #CM 7291.
POWER REQUIREMENTS:
+5 VDC	3.1 A, typical; 4.4 A max.
+12 VD	20 mA max.
-12 VDC	20 mA max.
Operating temperature	0° C to +50° C
Storage temperature	-20° C to +70° C
Humidity	8% to 80% noncondensing
Form factor	PC AT, 13.3 in. long 0.793 in. wide (total envelope), 4.5 in. high (excluding edge connector)

* All specifications are subject to change without notice.