P8R.9 Planned WSR-88D communications changes

Thursday, 27 October 2005
Alvarado F and Atria (Hotel Albuquerque at Old Town)
Christina Horvat, NOAA/NWS, Norman, OK; and S. Ahlert

The WSR-88D broadband communications is a two way link between Radar Data Acquisition (RDA) and Radar Product Generator (RPG). The link is presently capable of up to T1 data transfer. Implementation is via one of four methods: Commercial T1 service, co-located direct wire, remote direct wire/fiber optic, or microwave line of sight. Replacement of remote direct wire by fiber optic is a work in progress, driven by site specific chronic communications outages, and to prepare for future increases in bandwidth.

In addition to broadband, there is a WSR-88D narrowband communications system. Narrowband communications data transfer and protocol varies. Analog circuits are used with either X.25 or TCP/IP protocols and are limited to 9.6 kbps effective data rates. Digital frame relay circuits use TCP/IP and are typically capable of 256 kbps. Direct network connections use TCP/IP and are capable of up to 10/100 Mbps. A combination of equipment is required to allow disparate service providers, protocols and data transfers. Replacement of X.25 is a work in progress, driven by equipment obsolescence, and the need for additional bandwidth.

WSR-88D communications infrastructure is becoming challenging as the number of network connections grows and the demand for flexibility grows. This paper will demonstrate how a proposed architecture will better support future communications changes and will improve reliability of service, as well.

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