Main Logic Board; Modem Cards - Bay Networks 8000 RAC Installing Manual

Chapter 1 Introduction

Main Logic Board

Processors
WAN Interfaces
Ethernet Interfaces
Sync Port
Memory
Flash Memory

Modem Cards

Digital Modems
Installing the Model 8000 Remote Access Concentrator
1-4
The Model 8000 RAC uses three 80486 DX2 clock-doubled processors,
operating at 64 MHz.
Two WAN interfaces reside on the MLB and are accessible via RJ-48C
connectors on the rear panel. Each WAN interface is controlled by one
of the 80486 DX2 processors, which also controls the internal modems.
The WAN interfaces can accept channelized T1, channelized E1, or ISDN
PRI lines.
T he MLB provides AUI (for thick or thin Ethernet) and 10BASE-T (for
twisted pair) autosensed Ethernet interfaces, accessible via connectors
on the rear panel.
The MLB provides one synchronous port that can support V.35, X.21,
RS-422, and RS-232 physical interfaces, which are accessible through a
connector on the rear panel.
The MLB is equipped with 8 megabytes (MB) of main DRAM. An
additional 4 MB of DRAM is provided for each WAN interface controller.
The MLB is equipped with 4 MB of flash memory for image storage.
The RAC can be configured with up to 62 internal DSP-based digital
modems. The modems are dynamically downloaded with images to
configure them for the appropriate protocol. The modems are located on
plug-in modem cards installed on the main logic board.