Defined Architecture: Topologies

Introduction

The defined architecture restricts the addition of distributed I/O data to the system by means of either:

a distributed I/O sub-ring attached to a DRS

– or –
distributed I/O devices, known as a distributed I/O cloud, attached to DRS ports or 140NOC78000 distributed I/O head modules — that are not interlinked with other head modules — on the local rack

High Capacity Subsystem Example

The following graphic shows a sample high-capacity daisy chain loop network configuration. Interlink the 140NOC78000 distributed I/O head module with the 140CRP31200 remote I/O head module in the local rack to support in a Quantum EIO network:

140CRP31200 remote I/O head module on the local rack

140NOC78000 distributed I/O head module (interlinked with a 140CRP31200 module to manage the distributed I/O sub-ring)

140NOC78100 control head module that provides Ethernet transparency between the control network and the device network (combined remote I/O and distributed I/O devices)

distributed I/O sub-ring

DRSs configured to support copper-to-fiber transition on the main ring (connecting a distributed I/O sub-ring [4] and a distributed I/O cloud [6])

distributed I/O cloud

Ethernet remote I/O drop (which includes a •••CRA31200 adapter module) on the main ring

Ethernet remote I/O drops (which include •••CRA31200 adapter modules) on a remote I/O sub-ring

DRS (connected to a remote I/O sub-ring)

control network (connected to the 140NOC78100 module on the local rack)

main ring

In this complex Quantum EIO network topology — which consists of a main ring and multiple sub-rings — the following restrictions apply:

The maximum number of...	...is...
hops in a network path	32
remote I/O devices	31
remote I/O devices in the main ring	15
devices in any sub-ring	16
distributed I/O devices on the network	128