Application Configurations 2-9

Gateway

The VisuaLink Gateway application configuration allows shared VisuaLink 128/384 units between many users. Existing desktop video/ audio equipment users can now have high quality videoconferencing with VisuaLink. VisuaLink units can be configured in one of two typical gateway applications:

ViewPoint VBX Gateway

VisuaLink Direct Connect

Either application configuration allows shared VisuaLink 128/384 units between users. This can be a cost effective solution where existing video/audio equipment is already in place.

VisuaLink & ViewPoint VBX Gateway

A VisuaLink 128/384 unit could be used with a NEC ViewPoint VBX system. The VBX connects all local users, and VisuaLink provides the videoconferencing and interface functions (through the local PBX) to the Telco digital network. VisuaLink is then shared between all users through the VBX. A cost affordable multi-user solution.

VisuaLink & ViewPoint VBX Gateway to Telco Digital Network

VBX

POWER LINE

HEADSET

Telco

POWER

 

B1 B2-B6

 

 

VisuaLink 128/384

ISDN

PRI

BRI

ATM

T1

ViewPoint VBX

Equipment Rack

Desktop

Videoconferencing

NEAX 2400 IMX PBX or

NEAX 2000 PBX or

(Direct Connection to National ISDN1)

VisuaLink can be mounted in a Video Equipment rack

VisuaLink 128/384 General Description

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NEC 128 manual VisuaLink & ViewPoint VBX Gateway

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.