INTERNATIONAL SATELLITE COMMUNICATIONS SUCCESSOR SYSTEM

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INTERNATIONALSATELLITE COMMUNICATIONS SUCCESSOR
SYSTEM

• (ISCS)

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The International Satellite Communications System
(ISCS) GENERAL DESCRIPTION PURPOSE The ISCS is
composed of two systems for data delivery via
satellite communications. The first system is
the World Area Forecast System (WAFS) in support
of the International Civil Aviation Organization
(ICAO) program for aviation data distribution.
The WAFS broadcast makes globally available to
aviation users the centrally produced aviation
model forecast products of a World Area Forecast
Center (WAFC) in global gridded binary form (WMO
GRIB code), Alpha-numeric text, facsimile
graphics ( T4-FAX format), and satellite imagery
(GIF format) data types. T4 FAX will be replaced
by binary graphics (BUFR) data format in
2004. The second part of the ISCS is the Region
IV Meteorological Telecommunications Network
(RMTN) satellite system which replaced the two
WMO Region IV GTS regional communication networks
of the Antilles Meteorological (ANMET) and
Central America Meteorological (CEMET). The RMTN
supports WMO GRIB, alpha-numeric text, and T4-FAX
data types. T4 FAX will be replaced by binary
graphics (BUFR) data format in 2004.
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• The International Satellite Communications System
  (ISCS)
• The United States will continue to support
  ICAO/WMO requirements (as a servicing World Area
  Forecast Center - WAFC) with the ISCS.
• The global coverage will continue to span
  approximately from 105degrees east longitude to
  65 degrees east longitude (covering the Pacific
  Ocean, Atlantic Ocean, North America, Central
  America, South America, and the Caribbean).
• The remainder of the world coverage will continue
  to be supported by the WAFC located in the United
  Kingdom through their satellite broadcast system
  called SADIS (which primarily covers the
  European, Asian, and African continents as well
  as the Indian Ocean).

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• ATLANTIC OCEAN REGION (AOR)
• The AOR portion of the successor ISCS will be
  centered around the WorldCom shared Master
  Satellite Hub, in Andover, Maine.
• The Master Satellite Hub will be linked via a 64
  Kbps terrestrial (redundant) circuit to the
  National Weather Service Telecommunications
  Gateway (NWSTG) in Silver Spring, Maryland.
• The NWSTG will continue to serve as the central
  point of data entry into the ISCS.
• All ISCS data originating at the NWSTG will be
  transmitted, using TCP/IP network protocol, over
  to the WorldCom Andover facility for broadcast to
  all ISCS AOR sites.

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ISCS AOR Satellite Broadcast
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• PACIFIC OCEAN REGION (POR)
• The POR portion of ISCS will be centered around
  the WorldCom shared Master Satellite Hub in
  Yacolt, Washington.
• The Yacolt Master Satellite Hub will be linked
  via a 64 Kbps terrestrial (redundant) circuit to
  the WorldCom shared Master Satellite Hub in
  Andover, Maine.
• All ISCS WAFS data originating at the NWSTG will
  transmitted, using TCP/IP network protocol, to
  the Yacolt facility (via the Andover facility)
  for broadcast to all POR sites.

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ISCS WAFS Pacific Ocean Region
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• REGION IV METEOROLOGICAL
• TELECOMMUNICATIONS NETWORK (RMTN)
• The RMTN portion of the successor ISCS will be
  centered around the WorldCom shared Master
  Satellite Hub, in Andover, Maine.
• The Master Satellite Hub will be linked via a 64
  Kbps terrestrial (redundant) circuit to the
  National Weather Service Telecommunications
  Gateway (NWSTG) in Silver Spring, Maryland.
• All ISCS data originating at the NWSTG will be
  transmitted, using TCP/IP network protocol, to
  the WorldCom Andover facility for broadcast to
  all ISCS RMTN sites.
• All RMTN sites will uplink their data at 2.4
  Kbps, using TCP/IP network protocol, to the NWSTG
  (via the WorldCom Andover facility) for inclusion
  as part of the collective that is broadcast to
  all ISCS RMTN sites.

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• ISCS BACKUP
• In the event of a total or catastrophic failure
  of the NWSTG, additional protection for the
  broadcast of WAFS data will be incorporated into
  the successor ISCS network.
• Facilities will be established for the United
  Kingdom WAFC, and the NWS Aviation Weather
  Center, to directly dial up to the Andover Earth
  Station facility to broadcast critical data to
  the ISCS member nations.

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INTERNATIONALSATELLITE COMMUNICATIONS SUCCESSOR
SYSTEM

• DEPLOYMENT
• Web page for ISCS www.nws.noaa.gov/iscs

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• ISCS DEPLOYMENT GOALS
• Replace X.25 network protocol with TCP/IP
  network protocol
• All site owned VSAT equipment remains the same
• Additional Interface equipment will be added to
  registered sites
• Phased transition from existing network to
  successor network with minimum site
  downtime
• Dual operation of current / successor networks
  to reduce impact to users
• Extend system life with a technology refresh
  program to incorporate technology advancements
  for enhanced performance capabilities, as
  appropriate

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• ISCS DEPLOYMENT TIME LINE
• Contract Award December 2002
• Transition to new system December 2002 August
  2003
• Dual operations period August 2003 January
  2004
• End of Legacy contract September 2003