Sin ttulo de diapositiva

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The Air Traffic Services Voice Communications
Network

• Services that Isdefe can provide
• Isdefe is highly familiar with the current status
  of the Air Traffic Services (ATS) voice
  communications network through our active
  participation in its implementation. Isdefe is
  fully qualified to work in the evolution of this
  network, participating actively in international
  standardization groups, leading them when
  necessary, to work in the following areas
• I. Definition and standardization (at the ECMA
  level, if appropriate) of the Instantaneous
  Access signalling protocol between Voice
  Communications Systems (VCSs) and the air/ground
  voice communications signalling protocol between
  Voice Communications Systems (VCSs) and radio
  sites.
• II. Specification and monitoring of projects
  including field trials contracted to industry, to
  enable a determination of the suitability of the
  signalling, equipment and interfaces that have
  been defined.
• III. Specification and monitoring of the contract
  for an ATS-QSIG test tool for use by technical
  maintenance personnel at control centers and
  towers, for the implementation and subsequent
  maintenance of the digital ATS voice network.
• IV. Conduct of training courses for
• ATS-R2 and ATS-N5 signalling systems.
• ATS-QSIG signalling systems (basic and
  supplementary services).
• ATS-QSIG/ATS-R2/ATS-N5 gateways.
• ATS voice communications network .
• V. Study to integrate voice communications data
  into the network (REDAN) operated by Aena, the
  Spanish aeronautical service provider.

• Why are we able to provide these services?
• The Current Situation
• The Spanish ATS voice communications network is
  made up of
• VCSs in Aena's control centers and towers.
• Communication links linking these systems to each
  other and to radio voice communications sites.

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• VCSs at control centers enable the establishment
  of both ground/ground (between controllers) and
  air/ground (between controllers and pilots) voice
  communications through radio sites. In addition,
  they act as nodal exchanges, performing call
  rerouting functions within the network.
• The links, leased from the Spanish national
  telephone company, are dedicated and support
  Instantaneous Access (IA) communications, Direct
  Access (DA) communications and Indirect Access
  (IDA) communications, as well as communications
  through radio sites.
• IA communications are supported by end-to-end
  links between VCSs, using an analogue signalling
  protocol specifically designed by Aena. DA and
  IDA communications are supported by
• End-to-end lines between VCSs with signalling of
  the local-battery type.
• Switched lines between VCSs with in-band analogue
  signalling system ATS-R2 (as specified by
  Eurocontrol).
• As an alternative, conventional telephony through
  the Public Switched Network.
• Finally, air/ground communications are supported
  by end-to-end analogue lines linking the VCSs and
  radio sites. These communications use a
  signalling protocol specifically designed by
  Aena.
• Evolution
• The evolution of the ATS voice network is aimed
  at, on the one hand, full implementation of
  digital switched lines and, on the other hand and
  in parallel, implementation of standard digital
  signalling (ATS-QSIG) for such lines.

Necessary Actions in the Short and Medium Terms
EVOLUTION BL ---gt ATS R2 ---gt ECMA-312
The network will evolve in the following
way I. In general, interfaces with digital
lines using ATS-QSIG (ECMA-312) signalling will
be incorporated into VCSs. Call routing functions
will be perfected. ISDN communications will be
gradually incorporated as an alternative
communication medium through the Public Switched
Network.
EXAMPLE TRUNK LINE LINKING BARCELONA AND
BORDEAUX ACCs
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• II. For IA communications Replacement of current
  end-to-end analogue lines by digital switched
  lines, incorporating the Instantaneous Access
  signalling protocol (an international standard
  which is being defined).
• III. For DA and IDA communications Replacement
  of local-battery and analogue lines with ATS-R2
  signalling by switched digital lines
  incorporating the ATS-QSIG signalling protocol.
• IV. For air/ground communications definition of
  a communications protocol between VCSs and radio
  sites (as an international standard),
  incorporation of digital interfaces, replacement
  of current analogue lines by digital lines
  incorporating the signalling protocol that may be
  defined.
• V. Procurement of test equipment to enable the
  described evolution of the ATS voice
  communications network to take place.

Isdefe's Experience in the Field At the present
time, Isdefe is actively involved in the
following activities I. Specification of
requirements that must be met by VCSs as part of
the evolution. II. Definition of rules for
routing calls within the ATS voice communications
network.
III. Monitoring of current projects contracted to
industry involving the evolution of the ATS voice
communications network. As part of
customer-oriented engineering techniques in this
regards Isdefe has conducted design reviews,
auditing the degree of compliance with
international standards, and both factory and
on-site tests. IV. Formal definition of the
digital signalling protocol for the Instantaneous
Access Service and presentation to
Eurocontrol. V. Preparation and conduct of
seminars on analogue and digital
signalling. VI. Specification of test equipment
for different types of signalling. VII. Generatio
n of statistical line maintenance reports.
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List of Acronyms ATS Air Traffic
Services ATSN Air Traffic Services
Network ATS-N5 ITU No. 5 signalling,
particularized by EUROCONTROL ATS-R2 ITU R2
signalling, particularized by EUROCONTROL ATS-QSIG
Signalling at point Q" particularized by
EUROCONTROL DA Direct Access ECMA European
Computer Manufacturers Association IA Instantaneou
s Access IDA Indirect Access ITU International
Telecommunications Union REDAN (Spanish) Airport
and Air Navigation Data Network VCS Voice
Communications System
Isdefe Systems Engineering Transport Systems
Division Edison, 4. 28006 Madrid http//www.isdef
e.es/ Tel. [phone] Fax [phone]
5108 E-mail general_at_isdefe.es
ISMAOE-002168-1L