NEC 128 manual VisuaLink Direct Connect Gateway

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2-10 Application Configurations

VisuaLink Direct Connect Gateway

The VisuaLink Direct Connect Gateway application configuration uses VisuaLink 128/384 units as shared resources for different video/audio users and groups in a facility.

The diagram shows VisuaLink units and a cable patch panel mounted in an equipment rack. Video/audio cabling from various areas would connect to the patch panel. The patch panel would connect select areas with a particular VisuaLink unit, depending on user requirements. The VisuaLink units then provide a direct interface to the Telco digital network.

This gateway application configuration could utilize existing: Desktops video/audio systems, Roll-Abouts, video/audio meeting rooms, and multimedia areas. With existing equipment, VisuaLink adds high quality videoconferencing and ISDN BRI interface.

VisuaLink Direct Gateway to Telco Digital Network

Desktops

Executive Offices

Roll-Abouts

Training Classrooms

Video Monitor(s)

...

Room Cameras

 

 

Microphones

Existing Equipment Videoconference Room

Cable Patch Panel

VisuaLink 128

VisuaLink 128

VisuaLink 128

VisuaLink 384

VisuaLink 384

Common Equipment Rack

BRI

BRI

BRITelco

3-BRI

3-BRI

VisuaLink 128/384 General Description

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Contents NDA-24229, Issue VisuaLink 128/384Liability Disclaimer Contents Specifications Introduction OverviewFeatures Camera Control Echo CancellerPhone-Like Dialing Videoconferencing ComplianceField Upgradable PBX ConnectivityApplications Isdn BRI VisuaLink Documentation Introduction VisuaLink 128/384 General Description Application Configurations Roll-About Desktop PC GatewayRoll-About Easily moved, use in active locationsVisuaLink 128/384 Roll-About ComponentsVideo Cabinet Video MonitorCable Kit Motion Video CameraMicrophone OptionsDesktop PC Also available with control softwareVideo Capture Board Desktop PC ComponentsCCD Desktop Camera VisuaLink Director Software NT1 Graphics Camera D30 Camera AT841/INT MicrophonePersonal Computer Requirements Laptop PC optionGateway VisuaLink & ViewPoint VBX GatewayVisuaLink Direct Connect Gateway Technical Description System ControlCodec Echo CancellerVideo & Audio Interfaces VideoSystem Control Line InterfaceMore on H.320 Videoconferencing Picture ResolutionVideo Frame Rate Data Transmission Rate Video ProcessingAudio For ExampleTechnical Description VisuaLink 128/384 General Description Installation & Maintenance Installation RequirementsMaintenance Requirements Specifications General SpecificationsPage Parameter VisuaLink General ParametersUnit Size External Interface Parameters Line InterfaceSerial Call Dialing Originating Modes Operating Modes & FeaturesVisuaLink Unit Control Incoming Call Answer ModesVideo Display/Output Modes Line Interface ControlLine Connect Modes Audio Control ModesMaintenance Multi-Point Conference ControlSerial Port Modes VisuaLink 128/384 General Description

128 specifications

The NEC 128 is a remarkable microprocessor that represents a significant leap in technological innovation during its time. Introduced in the early 1980s, this processor was designed to meet the demands of increasingly sophisticated computing tasks, primarily aimed at the burgeoning field of personal computing and embedded systems.

One of the standout features of the NEC 128 is its 16-bit architecture, which was quite advanced for its era. This architecture allows for a greater data throughput, enabling the handling of larger data sets and providing improved performance over its predecessors. The NEC 128 operates on a clock speed that typically ranges from 4 to 8 MHz, making it capable of executing instructions efficiently and swiftly, which was crucial for running more complex applications.

The processor is built using CMOS technology, which offers significant advantages in terms of power consumption compared to earlier bipolar technology. This characteristic made the NEC 128 not only suitable for desktop computing but also an appealing choice for battery-operated devices, enhancing its versatility. The use of CMOS allowed for a reduced heat output, contributing to the reliability and longevity of devices powered by this microprocessor.

Another noteworthy aspect of the NEC 128 is its support for a variety of addressing modes. This flexibility enables programmers to write more efficient and compact code, optimizing the use of memory resources. By supporting both immediate and indirect addressing, the NEC 128 allows for more dynamic programming, which is essential for developing applications that require real-time processing.

The processor's architecture also includes a robust instruction set that facilitates arithmetic operations, logical operations, and control flow management. This comprehensive instruction set is instrumental for developers, as it provides the necessary tools for creating a wide range of applications, from simple utilities to more complex software systems.

In summary, the NEC 128 microprocessor is characterized by its 16-bit architecture, efficient CMOS technology, and a versatile instruction set, making it a compelling choice for its era. Its combination of performance, power efficiency, and flexibility positioned it as a formidable player in the personal computing market and laid the groundwork for future advancements in microprocessor technology. With its various applications and features, the NEC 128 remains a noteworthy chapter in the history of computing.