Nokia 6800 Series, 7000 Series operation manual DNH-6800 DigiNet Hub Module, Overview, Chapter

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.

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