National Airspace Data Interchange Network (NADIN) Communications Support for Flight Service Automation System

摘要

The FSAS service was analyzed to determine NADIN enhancements required to support FSAS data communications. The analysis yielded the following conclusions: (1) The NADIN backbone architecture fits FSAS needs and requires no change; however, the NADIN switch to concentrator line speeds need to be increased from 4.8 to 9.6 Kbits/second; (2) The FSAS file transfers may cause relatively long delays to Service B and AFTN messages. By having the switches systematically intersperse frames of messages going to different concentrator input circuits, the delay effects of these file transfers can be minimized; (3) Control of AWP message transmissions is recommended. Flow control will result in a more efficient use of the processing and memory resources of NADIN switches; and (4) The AWP and FSDPS software should be designed to enable the AWPs to interrupt large weather file transmissions to send shorter messages. (Author)