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24 Chapter 1: Introduction to the EIU
297-8991-910 Standard 03.01 August 1999
Figure 1 Overall architecture of enhanced SuperNode 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
SLM
Network IOC
DMS-bus
9-track tape
SOS UNIXSOS SOS
AP
(provisionable
computing)
AP
(provisionable
computing)
FP
(flexible
file system)
Ethernet
Communications server
(flexible data
communications interface)
X.25
Workstation
EIU
DMS-core