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6800/7000 Series - Distribution and Routing Products Installation and Opertion Manual 11

Chapter 2

DNH-6800 DigiNet Hub Module

Overview

The DNH-6800 DigiNet Hub module connects up to nine separate

DigiNet cable segments into one logical control network, making it

possible to span large physical distances and support a greater number

of unit nodes without degradation of signal quality due to attenuation

and return loss.

A data stream originating from a node on any one of the nine DigiNet

segments is automatically detected, reclocked, reshaped, and

retransmitted to all other segments by the DNH-6800. DigiNet’s Carrier

Sense Multiple Access with Collision Detect (CSMA/CD) protocol is

supported by implementing independent collision detection on each

channel and by a jamming mechanism that propagates a collision event

detected on a transmitting channel to transmitting nodes on all other

channels (see Figure 2-1 “DNH-6800 Block Diagram Flow” on page 12).

Specifications and designs are subject to change without notice.

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Nokia 6800 Series Manual de usuario Pagina 38