Dms-Bus Interface And Expansion; Figure 1 Overall Architecture Of Enhanced Supernode System - Nortel DMS-100 User Manual

24 Chapter 1: Introduction to the EIU

Figure 1 Overall architecture of enhanced SuperNode system

SLM
DMS-core
DMS-bus
SOS
FP
(flexible
file system)

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
Network
SOS UNIX
AP AP
(provisionable (provisionable
computing) computing)
Communications server
(flexible data
communications interface)
IOC
SOS
EIU
Ethernet
Workstation
X.25
9-track tape