24Chapter 1: Introduction to the EIU

Figure 1 Overall architecture of enhanced SuperNode system

SLM

 

 

 

 

 

 

9-track tape

DMS-core

Network

IOC

 

DMS-bus

 

 

 

SOS

SOS

UNIX

SOS

FP

AP

AP

EIU

(flexible

(provisionable

(provisionable

 

file system)

computing)

computing)

 

 

 

Ethernet

 

 

Communications server

 

 

(flexible data

 

 

communications interface)

 

 

 

 

Workstation

 

 

X.25

 

DMS-bus interface and expansion

Two methods are used to interface processing engines to the DMS-bus. Direct links between the processors and the DMS-bus is the primary method for establishing this connection. A secondary method involves the LPP, which is used to fan out the message switch (MS). By having two methods, the DMS- 100 switch has the flexibility for provisioning software functions to processors based on price, performance, and packaging criteria.

The LPP extends the MS fanout within a single cabinet. This fanout is accomplished by using a second-level MS pair to provide switching, and by extending the messaging capability through an extended messaging bus. These

297-8991-910 Standard 03.01 August 1999

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Cabletron Systems DMS-100 manual DMS-bus interface and expansion, Slm, Ioc, SOS Unix EIU