Switch Features That Permit an Outboard Processor to Control Routing and Preemption.
Abstract
New routing and preemption capabilities desired in the DSN can be obtained using commercial switches by adding outboard processors connected to switches via attendant console ports. This report lists and describes 22 switch features that allow an outboard processor to provide non-standard routing and preemption capabilities without extensive modifications to switch software. To the best of our knowledge, a modern class 4/5 switch designed for use with common channel signaling has all the features needed to support an outboard processor. The call-handling capacity of a switch/outboard-processor combination is limited by the bandwidth of the switch-to-outboard-processor connection and by the ability of the switch's central processor to handle the unexpected demands placed on it by outboard processors. The bandwidth limitation can be overcome by interfacing the outboard processor to the switch using multiple attendant console ports or by using a custom higher-speed interface. The switch processor limitation can be overcome if the switch processor is sized appropriately and software tasks associated with outboard processors are given high priority.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 06, 1984
- Accession Number
- ADA146193
Entities
People
- H. M. Heggestad
- R. Berger
- R. P. Lippmann
Organizations
- Massachusetts Institute of Technology