Attachment J-7 DTFAWA-09-R-00462
November 23, 2009 NAS-IR-82153118
U.S. Department of Transportation
Federal Aviation Administration
Interface Requirements Document
(Draft)
Digital Altimeter Setting Indicator (DASI)
To
NAS Information Display System
(NIDS)
Attachment J-7 DTFAWA-09-R-00462
November 23, 2009 NAS-IR-82153118
INTERFACE REQUIREMENTS DOCUMENT
APPROVAL SIGNATURE PAGE
Digital Altimeter Setting Indicator (DASI)
to
NAS Information Display System (NIDS)
APPROVAL SIGNATURES
PARTICIPANT NAME DATE
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REVISION RECORD
Revision Description Date Entered By
Number
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Table of Contents
1 SCOPE .................................................................................................................................................. 1
1.1 SUMMARY .................................................................................................................................... 1
1.2 SUBSYSTEM RESPONSIBILITY LIST. .............................................................................................. 1
2 APPLICABLE DOCUMENTS ........................................................................................................... 1
2.1 GOVERNMENT DOCUMENTS. ........................................................................................................ 1
2.2 NON-GOVERNMENT DOCUMENTS. ............................................................................................... 2
2.3 DOCUMENT SOURCES................................................................................................................... 2
3 INTERFACE REQUIREMENTS/DESIGN CHARACTERISTICS .............................................. 3
3.1 GENERAL REQUIREMENTS/CHARACTERISTICS ............................................................................. 3
3.2 FUNCTIONAL REQUIREMENTS/DESIGN CHARACTERISTICS ........................................................... 6
3.3 PHYSICAL REQUIREMENTS/CHARACTERISTICS ...........................................................................12
4 QUALITY ASSURANCE PROVISIONS ........................................................................................ 13
4.1 RESPONSIBILITY FOR VERIFICATION. ..........................................................................................13
4.2 SPECIAL VERIFICATION REQUIREMENTS. ....................................................................................13
4.3 VERIFICATION REQUIREMENTS TRACEABILITY MATRIX .............................................................13
5 PREPARATION FOR DELIVERY ................................................................................................. 25
6 NOTES ................................................................................................................................................ 25
6.1 DEFINITIONS. ..............................................................................................................................25
6.2 ABBREVIATIONS AND ACRONYMS ...............................................................................................27
List of Figures
FIGURE 3.1-1. DASI TO NIDS SERVER CONNECTIVITY DIAGRAM. ............................................ 4
FIGURE 3.1-2. DASI TO NIDS WORKSTATION CONNECTIVITY DIAGRAM. ............................. 5
FIGURE 3.2.3-1 DASI TO NIDS OSI MODEL ........................................................................................ 11
List of Tables
TABLE 3.2.2.3.1-1 C&G DASI DATA PACKET. ...................................................................................... 8
TABLE 3.2.2.3.2-1 DME DASI DATA PACKET. ...................................................................................... 9
TABLE 3.3.1.2-1. DASI FSK SIGNAL OUTPUT CABLE PIN DATA................................................. 13
TABLE 4.1 VERIFICATION REQUIREMENTS TRACEABILITY MATRIX .................................. 14
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1 SCOPE
1.1 Summary
This Interface Requirements Document (IRD) provides the requirement for an interface
between the Digital Altimeter Setting Indicator (DASI) and the NAS information Display
System (NIDS). This IRD has been prepared in accordance with FAA STD-025F,
Preparation of Interface Documentation.
1.2 Subsystem Responsibility List.
The following subsystems are affected by this IRD:
COMMON OFFICE
SUBSYSTEM NAME RESPONSIBLE
NAS information Display System NIDS AJT-13
C&G Digital Altimeter Setting Indicator C&G DASI AJW-14A
DME Digital Altimeter Setting Indicator DME DASI AJW-14A
2 APPLICABLE DOCUMENTS
The following documents form a part of this IRD to the extent specified herein. In the
event of conflict between the documents referenced herein and the contents of this IRD,
the contents of this IRD are to be considered the superseding requirements.
2.1 Government Documents.
FAA Specifications:
FAA-G-2100H Electronic Equipment, General Requirement, May 9,2005
NAS-SR-1000 National Airspace System, System Requirements Specification
June 2008 (Rev B Aug 27, 2008)
FAA-E 2569B Altimeter Setting Indicator Digital Readout System, February 19,
1993
FAA Standards:
FAA-STD-025F Preparation of Interface Documentation, November 30, 2007
FAA-STD-039C National Airspace System (NAS) Open System Architecture
August 14, 2003
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Other FAA
Documents:
TIB 6960.10 Digital Altimeter Setting Indicator
2.2 Non-Government Documents.
Electronic Industries Interface Between Data Terminal Equipment and Data
Association (EIA) Communication Equipment Employing Serial Binary Data
EIA-STD-RS-232C Interchange
Bell 103 AT&T Bell Labs specification, Bell 103
2.3 Document Sources.
2.3.1 Source of Federal Aviation Administration (FAA) Documents.
Copies of specifications, standards, and publications may be obtained from the
Contracting Officer, Federal Aviation Administration, 800 Independence Avenue, SW,
Washington, D.C., 20591. Requests should clearly identify the desired material by
number and data, and state the intended use of the material
2.3.2 Source of Military Standards Documents.
Copies of military standards and specifications may be obtained by mail or by telephone
from the Defense Automated Printing Service, Bldg. 4, Section D, 700 Robbins Avenue,
Philadelphia, PA 19111-5094. For Telephone requests, call (215) 697-2179/4107, 7:30
AM to 4:00 PM, Monday through Friday. A charge is made for each document ordered.
2.3.3 International Organization for Standardization (ISO) Documents.
Copies of ISO standards may be obtained from the American National Standards
Institute, 11 West 42nd Street, New York, NY, 10036.
2.3.4 Electronics Industries Association (EIA) Documents.
Copies of EIA standards may be obtained from the Department of Public Affairs,
Electrical Industries Association, 2500 Wilson Boulevard, Arlington, VA, 22201; or by
calling (703) 907-7791.
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3 INTERFACE REQUIREMENTS/DESIGN CHARACTERISTICS
Note: The following is included to simplify the understanding of the terminology
used in this IRD:
a. The NIDS system with respect to this interface is comprised of three basic
components. They are as follows:
1. The NIDS system display application - This application is the
heart of the NIDS and controls the displaying of data on the
NIDS system display pages.
2. The NIDS DASI interface application – This application
controls the interface requirements between the DASI and the
NIDS system display application.
3. The NIDS monitoring/configuration application – this
application monitors the health of the system and is used to
configure most if not all of the NIDS interface applications.
3.1 General Requirements/Characteristics
This IRD describes the interface between the NIDS DASI interface and the two types of
DASI currently used by the FAA. They are the C&G DASI and the DME DASI.
The NIDS DASI interface shall[FPR001] receive Altimeter Setting Information from the
DASI. The NIDS DASI interface shall[FPR002] be a single direction receive only analog
interface. The NIDS DASI interface shall[FPR003] contain hardware which accepts the
FSK coded analog signal from the DASI and converts that signal into a digital signal for
use by the NIDS DASI interface application. When a DASI product is received, the
converted digital data shall[FPR004] be stored and/or dissemination throughout the NIDS in
accordance with the NIDS specification. The data shall[FPR005] also be displayed on the
NIDS in accordance with the NIDS specification. The NIDS DASI interface Connectivity
Point shall[FPR006] be the redundant Server and a NIDS workstation. See Figures 3.1-1 and
3.1-2.
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Tower Equipment Room
Tower Cab
NIDS
NIDS Server Ethernet
Worksation
Cabinet with
redundant servers
NIDS
Workstation
DASI
TRACON
Analog Signal - FSK coded data
Figure 3.1-1. DASI to NIDS Server Connectivity Diagram.
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NIDS
DASI
Analog Signal - FSK coded data
Workstation
Figure 3.1-2. DASI to NIDS Workstation Connectivity Diagram.
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3.1.1 Security Requirements/Characteristics
The NIDS DASI interface configuration shall[FPR007] use the NIDS System level
password or the NIDS Maintenance level password to gain access to the configuration
parameters for change. When entering a password the NIDS DASI interface shall[FPR008]
allow the accessed function to be canceled. The NIDS DASI interface shall[FPR009] allow
the user to exit the editing functions without saving the changes or impacting the
operational capabilities of the interface. No logging of password entry or failed attempts
is required of this interface. No further information security requirements are imposed
beyond those native to the NIDS.
This interface will pose no security risks for the FAA for the following reasons; the DASI
is a FAA owned system. The DASI to NIDS DASI interface is an analog FSK interface
that is hardwired together in the same building. The DASI has already gone through a
security certification and so will the NIDS as part of the test effort required to deploy the
NIDS. The DASI system provides sea level pressure to the NIDS for use by the Air
Traffic Controllers.
3.2 Functional Requirements/Design Characteristics
3.2.1 General Service Functional Requirements
The DASI shall[FPR010] be connected to the NIDS as shown in Figures 3.1-1 and 3.1-2.
The FSK coded signal shall[FPR011] be one way from the DASI to the NIDS. Hardware in
the NIDS shall[FPR012] convert the FSK coded signal into a digital data stream. The
digital data stream shall[FPR013] be scanned by the NIDS DASI interface application for
the ASCII data.
3.2.2 Application Process and Message Requirement
3.2.2.1 Identification of Each Application Process
3.2.2.1.1 DASI Application Process
The C&G DASI Application Process shall[FPR014] provide FSK coded data to the NIDS in
accordance with Bell 103 specifications.
The DME DASI Application Process shall[FPR015] provide FSK coded data to the NIDS in
accordance with CCITT V.21 specifications
3.2.2.1.2 NIDS DASI Interface Applications Process
The NIDS DASI Interface Applications Process shall[FPR016] store the decoded FSK data
from either the C&G DASI or the DME DASI and process it for display on the NIDS
workstations.
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3.2.2.2 Application Process Capability Requirements
3.2.2.2.1 The DASI Application Process Capability Requirements are as follows:
a. The DASI provides actual sea level pressure based on the U.S. Standard
Atmosphere Table to the NIDS for which the National Airspace System
(NAS) category of service is essential in accordance with NAS-SR-1000.
b. The DASI provides FSK coded (Altimeter Setting Indicator) ASI information
to the NIDS.
c. The C&G DASI message is transferred asynchronously to the NIDS in 8 bytes
of data.
d. The DME DASI message is transferred asynchronously to the NIDS in 5 bytes
of data.
e. For the C&G DASI, the 8 bytes make up the pressure product.
f. For the DME DASI, the 5 bytes make up the pressure product.
3.2.2.2.2 The NIDS DASI Interface Application Process Capability Requirements are as
follows:
a. The NIDS DASI Interface shall[FPR017] decode the received FSK signal into a
digital data stream.
b. The NIDS DASI interface application shall[FPR018] take the digital data stream
and store the decoded DASI data on the hard drive for use by the NIDS
system display application.
c. The NIDS system display application shall[FPR019] display the DASI product.
d. The NIDS DASI interface application shall[FPR020] be configurable through the
executable program and by external application such as a system
monitoring/configuration application that shall be supplied by the contractor
as part of this program.
e. The NIDS DASI interface configuration menu shall[FPR021] have a selection to
select if the NIDS DASI interface is a C&G DASI or a DME DASI.
f. The NIDS DASI Interface Application data source that is used by the NIDS
system display page shall[FPR022] be selectable in the configuration menu.
g. If the NIDS uses a windows operating system, all interface configuration
parameters shall[FPR023] be written to the registry or the equivalent for a non
windows operating system.
h. The NIDS DASI interface application shall[FPR024] contain a test function that
tests the interface independently of the NIDS system display application. The
test function shall[FPR025] open a notepad type window that displays the data
coming across the interface. There shall[FPR026] be a way to capture the data in
the window and store it on the hard drive. The data shall[FPR027] be stored and
easily retrieved and displayed by a program for troubleshooting purposes.
The retrieval program shall[FPR028] be supplied as part of the system but should
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function independently of the NIDS applications. The retrieval program
shall[FPR029] be transportable to any other computer running the same
operating system and shall operate without the need for a license.
3.2.2.3 Message Content Requirements
3.2.2.3.1 C&G DASI Message Content
The decoded digital message from the C&G DASI shall[FPR030] be a stream of ASCII data
containing the C&G DASI messages in the format shown below:
a. The ASCII start byte STX (0x02)
b. The two-character ASCII representation of the C&G DASI integer.
c. The C&G DASI decimal point, ASCII character „.‟ (hex 0x2E).
d. The two-character ASCII representation of the C&G DASI fraction.
e. The ASCII end byte ETX (0x03)
The NIDS DASI interface shall[FPR031] store (replacing older data) the eight bytes
representing the C&G DASI integer, decimal, and fraction. The C&G DASI Data Packet
is shown below in table 3.2.2.3.1-1.
BIT POSITION
BYTE 7 6 5 4 3 2 1 0
1 Start character STX = 0x02
2
DASI Integer
3
4 DASI Decimal Point = 0x2E
5
6 DASI Fraction
7
8 End character ETX = 0x03
Table 3.2.2.3.1-1 C&G DASI Data Packet.
3.2.2.3.2 DME DASI Message Content
The decoded digital message from the DME DASI shall[FPR032] be a stream of ASCII data
containing the DME DASI messages in the format shown below:
a. The two-character ASCII representation of the DME DASI integer.
b. The DME DASI decimal point, ASCII character „.‟ (hex 0x2E).
c. The two-character ASCII representation of the DME DASI fraction.
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The NIDS DASI DME interface shall[FPR033] store (replacing older data) the five bytes
representing the DME DASI integer, decimal, and fraction. The DME DASI Data Packet
is shown below in table 3.2.2.3.2-1.
BIT POSITION
BYTE 7 6 5 4 3 2 1 0
1
DME DASI Integer
2
3 DME DASI Decimal Point = 0x2E
4
DME DASI Fraction
5
Table 3.2.2.3.2-1 DME DASI Data Packet.
3.2.2.4 Relationship among Messages
The data flow shall[FPR034] be one-way, from the DASI to NIDS system. The NIDS
system display application shall[FPR035] replace the old message with the new message.
The NIDS system display application shall[FPR036] display the DASI data, and
disseminating the data throughout the remainder of the NIDS system in accordance with
the NIDS specification.
3.2.2.5 Quality of Service Requirements
The following is a list of the Quality of Service parameters:
a. Priority – The NIDS DASI interface and application processing shall[FPR037]
be implemented in such a way as to guarantee the update of data at a category
equivalent to Essential as defined in the NAS-SS-1000.
b. Urgency – Within 3 seconds of receiving DASI data, the data shall[FPR038] be
stored and displayed on the NIDS.
c. Importance – The DASI data is considered dynamic data which shall[FPR039]
have a priority over any static data changes. Static data is defined as an
update to the system caused by either an Air Traffic or Airway Facilities
person.
d. Data integrity – The NIDS DASI interface shall[FPR040] perform error checks
as defined in section 3.2.2.6.
e. Expected Bit Error Rate – The expected bit error rate shall[FPR041] be less than
10E-06.
f. Latency – This interface is a hardwired connection, the latency shall[FPR042] be
measured from the time the DASI outputs the data to the time the data is
displayed on the NIDS. This value shall[FPR043] not exceed 3 seconds.
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g. Throughput – C&G DASI up to 300 bits per second.
h. Throughput – DME DASI up to 110 bits per second
i. Message Size – C&G DASI message size is 8 bytes.
j. Message Size – DME DASI message size is 5 bytes.
3.2.2.6 Error Handling Requirements
The NIDS DASI interface shall[FPR044] store and process for display purposes any
identical message received three consecutive times from the DASI, providing the
message bytes have valid parity, are of the correct length, and fall in the range of 27 to
32. See paragraph 3.2.3.1 for more information. If these conditions are not satisfied, the
NIDS system display application shall[FPR045] coast the last good DASI value until the
conditions listed above are satisfied. If the conditions listed above are not satisfied for a
period of 2.5 minutes, the NIDS system display shall[FPR046] display “ERROR” for the
DASI value. A bit or value shall[FPR047] be sent to an NIDS Monitoring Application
indicating that the interface has failed and an error message with the current system date
and time shall be written to a DASI specific event log
3.2.2.7 Interface Summary Table
Following is a summary of the messages sent from the DASI to the NIDS:
Message Name Format Size (bytes) Time Constraints Frequency
C&G DASI Fixed 8 N/A N/A
Packet
DME DASI Fixed 5 N/A N/A
Packet
Figure 3.2.2.7-1 Interface Summary Table, C&G DASI to NIDS
3.2.3 Protocol Implementation
Figure 3.2.3-1 below is the 7 layer OSI model for the DASI to NIDS DASI interfaces.
Layers 3 through 6 do not have applicability to this interface.
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DASI NIDS
OSI Layer
1 Application Sensor/Translator DASI Interface
2 Presentation N/A N/A
3 Session N/A N/A
4 Transport N/A N/A
5 Network N/A N/A
6 Data Link FSK Modulator FSK Demodulator
Modulated Analog Carrier Modulated Analog Carrier
7 Physical C&G (FSK - Bell 103) C&G (FSK - Bell 103)
DME (FSK - CCITT V.21) Analog DME (CCITT V.21)
Figure 3.2.3-1 DASI to NIDS OSI Model
3.2.3.1 Application Layer Services
The NIDS DASI interface applications layer service shall[FPR048] control and process the
received DASI data that is sent over the interface in accordance with paragraph 3.2.2.2
through paragraph 3.2.2.6 of this document. In addition, for the C&G DASI the NIDS
DASI interface application software shall[FPR049] support a data rate of 300 bits per
second, using Mark parity, a 7-bit word length, and two stop bits. For the DME DASI
the NIDS DASI interface application software shall[FPR050] support a data rate of 110 bits
per second, using even parity, a 7-bit word length, and one stop bit.
3.2.3.2 Transport Layer and Lower Layer Services
3.2.3.2.1 Transport Layer
There are no Transport layer services associated with this interface.
3.2.3.2.2 Lower Layer Services
The only lower layer service associated with this interface is the Physical Layer. For the
physical layer the interface point for connecting the NIDS system to the DASI system
shall[FPR051] be a shielded twisted pair cable coming from the DASI sensor translator unit.
For the C&G DASI , the physical layer is in accordance with the Bell 103 standard. For
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the DME DASI, the physical layer is in accordance with the CCITT V.21 standard.
There shall[FPR052] be a separate FSK demodulator for each connection to a server or
workstation to demodulate the incoming DASI FSK signal. For redundant servers, the
DASI signal shall[FPR053] be split at the NIDS side.
Both the redundant server configuration and the workstation configuration shall[FPR054] be
tested to ensure that the NIDS can accurately process and display the DASI data.
3.2.3.2.3 Network Layer
There is no Network layer services associated with this interface.
3.2.3.2.4 Data Link Layer
The NIDS DASI interface data link layer shall[FPR055] use an FSK demodulator to
demodulate the incoming analog FSK signal into a digital data stream.
3.2.3.3 Naming and Addressing
There is no naming or addressing associated with this interface.
3.3 Physical Requirements/Characteristics
The DASI information is outputted from the DASI sensor/translator unit as an encoded
FSK signal. The DASI FSK signal shall[FPR056] be converted to a digital data stream for
use by the NIDS DASI interface application. To decode the FSK signal to a digital data
stream, a FSK demodulator shall[FPR057] be used.
3.3.1 Electrical Power and Electronic Requirements/Characteristics
The DASI and NIDS DASI interface are analog-type signals. The NIDS DASI FSK
demodulator shall[FPR058] operate over an input range of 0 to -30 dbm measured into a 600
ohm load. The FSK demodulator shall[FPR059] have an input impedance of 1 mega ohm or
greater.
3.3.1.1 Connectors
The connectors used on the digital portion of this interface shall[FPR060] be standard DB9
or DB25 connectors as applicable with cable strain relief mounting. The connectors used
on the analog side shall[FPR061] match the equipment that they attach to.
3.3.1.2 Wire/Cable
The NIDS DASI interface shall[FPR062] utilize shielded twisted pair cables to provide
connectivity. The cable shall[FPR063] be connected as shown in Table 3.3.1.2-1 below with
the shield attached on the DASI side only. The cable used for this interface shall[FPR064]
be plenum rated.
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C&G DASI DASI Cannon Function
connector P1
C&G DASI A FSK Output High
C&G DASI B FSK Output Ret
C&G DASI C Shield
DME DASI DASI Cannon
connector A1J1
DME DASI B FSK Output
DME DASI D FSK Output
DME DASI C Shield
Table 3.3.1.2-1. DASI FSK Signal Output Cable Pin data.
3.3.1.3 Grounding
Not Applicable.
3.3.1.4 Fasteners
Standard Screw in fasteners shall[FPR065] be used on the DB9 or DB 25 connectors.
3.3.1.5 Electromagnetic Compatibility
The cabling for the interface shall[FPR066] have the same electromagnetic requirements as
the NIDS system for both emissions and susceptibility.
4 QUALITY ASSURANCE PROVISIONS
4.1 Responsibility for Verification.
The government has the responsibility of developing and implementing the verification
of requirements for each project. The government may delegate verification activities to
other organizations, independent contractors, and/or the prime contractor.
4.2 Special Verification Requirements.
This IRD impose no special verification requirements.
4.3 Verification Requirements Traceability Matrix
Verification methods and levels shall be applied in accordance with Table 4-1,
Verification Requirements Traceability Matrix (VRTM).
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Table 4-1. Final Program Requirements (FPR) Verification Requirements Traceability Matrix (VRTM)
D=Demonstration, I=Inspection, A=Analysis, T=Test, N/A and X = Not Applicable
Test Phase and Methodology
Test
Reqmt ID Paragraph No. Requirement FAT OT SAT Remarks
ID
(Contractor) (WJHTC) (Key Site)
FPR001 3.1 The NIDS DASI interface shall[FPR001] I I I
receive Altimeter Setting Information from
the DASI.
FPR002 3.1 The NIDS DASI interface shall[FPR002] be a I I I
single direction receive only analog
interface.
FPR003 3.1 The NIDS DASI interface shall[FPR003] D D X
contain hardware which accepts the FSK
coded analog signal from the DASI and
converts that signal into a digital signal for
use by the NIDS DASI interface
application.
FPR004 3.1 When a DASI product is received, the D D D
converted digital data shall[FPR004] be stored
and/or dissemination throughout the NIDS
in accordance with the NIDS specification.
FPR005 3.1 The data shall[FPR005] also be displayed on D D D
the NIDS in accordance with the NIDS
specification.
FPR006 3.1 The NIDS DASI interface Connectivity I I I
Point shall[FPR006] be the redundant Server
or an NIDS workstation.
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Table 4-1. Final Program Requirements (FPR) Verification Requirements Traceability Matrix (VRTM)
D=Demonstration, I=Inspection, A=Analysis, T=Test, N/A and X = Not Applicable
Test Phase and Methodology
Test
Reqmt ID Paragraph No. Requirement FAT OT SAT Remarks
ID
(Contractor) (WJHTC) (Key Site)
FPR007 3.1.1 The NIDS DASI interface configuration D D X
shall[FPR007] use the NIDS System level
password or the NIDS Maintenance level
password to gain access to the
configuration parameters for change.
FPR008 3.1.1 When entering a password the NIDS DASI D D X
interface shall[FPR008] allow the accessed
function to be canceled.
FPR009 3.1.1 The NIDS DASI interface shall[FPR009] D D X
allow the user to exit the editing functions
without saving the changes or impacting
the operational capabilities of the interface.
FPR010 3.2.1 The DASI shall[FPR010] be connected to the I I I
NIDS as shown in Figures 3.1-1 and 3.1-2.
FPR011 3.2.1 The FSK coded signal shall[FPR011] be one I I I
way from the DASI to the NIDS.
FPR012 3.2.1 Hardware in the NIDS shall[FPR012] convert D D D
the FSK coded signal into a digital data
stream.
FPR013 3.2.1 The digital data stream shall[FPR013] be D D D
scanned by the NIDS DASI interface
application for the ASCII data.
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Table 4-1. Final Program Requirements (FPR) Verification Requirements Traceability Matrix (VRTM)
D=Demonstration, I=Inspection, A=Analysis, T=Test, N/A and X = Not Applicable
Test Phase and Methodology
Test
Reqmt ID Paragraph No. Requirement FAT OT SAT Remarks
ID
(Contractor) (WJHTC) (Key Site)
FPR014 3.2.2.1.1 The C&G DASI Application Process A A A
shall[FPR014] provide FSK coded data to the
NIDS in accordance with Bell 103
specifications.
FPR015 The DME DASI Application Process A A A
shall[FPR015] provide FSK coded data to the
NIDS in accordance with CCITT V.21
specifications
FPR016 3.2.2.1.2 The NIDS DASI Interface Applications D D D
Process shall[FPR016] store the decoded FSK
data from either the C&G DASI or the
DME DASI and process it for display on
the NIDS workstations.
FPR017 3.2.2.2.2 The NIDS DASI Interface shall[FPR017] D D D
decode the received FSK signal into a
digital data stream.
FPR018 3.2.2.2.2 The NIDS DASI interface application D D D
shall[FPR018] take the digital data stream and
store the decoded DASI data on the hard
drive for use by the NIDS system display
application.
FPR019 3.2.2.2.2 The NIDS system display application D D D
shall[FPR019] display the DASI product.
16
Attachment J-7 DTFAWA-09-R-00462
November 23, 2009 NAS-IR-82153118
Table 4-1. Final Program Requirements (FPR) Verification Requirements Traceability Matrix (VRTM)
D=Demonstration, I=Inspection, A=Analysis, T=Test, N/A and X = Not Applicable
Test Phase and Methodology
Test
Reqmt ID Paragraph No. Requirement FAT OT SAT Remarks
ID
(Contractor) (WJHTC) (Key Site)
FPR020 3.2.2.2.2 The NIDS DASI interface application D D D
shall[FPR020] be configurable through the
executable program and by external
application such as a system
monitoring/configuration application that
shall be supplied by the contractor as part
of this program.
FPR021 3.2.2.2.2 The NIDS DASI interface configuration D D D
menu shall[FPR021] have a selection to select
if the NIDS DASI interface is a C&G
DASI or a DME DASI.
FPR022 3.2.2.2.2 The NIDS DASI Interface Application data D D D
source that is used by the NIDS system
display page shall[FPR022] be selectable in
the configuration menu.
FPR023 3.2.2.2.2 If the NIDS uses a windows operating D D D
system, all interface configuration
parameters shall[FPR023] be written to the
registry or the equivalent for a non
windows operating system.
FPR024 3.2.2.2.2 The NIDS DASI interface application D D D
shall[FPR024] contain a test function that tests
the interface independently of the NIDS
system display application.
17
Attachment J-7 DTFAWA-09-R-00462
November 23, 2009 NAS-IR-82153118
Table 4-1. Final Program Requirements (FPR) Verification Requirements Traceability Matrix (VRTM)
D=Demonstration, I=Inspection, A=Analysis, T=Test, N/A and X = Not Applicable
Test Phase and Methodology
Test
Reqmt ID Paragraph No. Requirement FAT OT SAT Remarks
ID
(Contractor) (WJHTC) (Key Site)
FPR025 3.2.2.2.2 The test function shall[FPR025] open a D D D
notepad type window that displays the data
coming across the interface.
FPR026 3.2.2.2.2 There shall[FPR026] be a way to capture the D D D
data in the window and store it on the hard
drive.
FPR027 3.2.2.2.2 The data shall[FPR027] be stored and easily D D D
retrieved and displayed by a program for
troubleshooting purposes.
FPR028 3.2.2.2.2 The retrieval program shall[FPR028] be D D D
supplied as part of the system but should
function independently of the NIDS
applications.
FPR029 3.2.2.2.2 The retrieval program shall[FPR029] be D D D
transportable to any other computer
running the same operating system and
shall operate without the need for a license.
FPR030 3.2.2.3.1 The decoded digital message from the D D X
C&G DASI shall[FPR030] be a stream of
ASCII data containing the C&G DASI
messages in the format shown below:
18
Attachment J-7 DTFAWA-09-R-00462
November 23, 2009 NAS-IR-82153118
Table 4-1. Final Program Requirements (FPR) Verification Requirements Traceability Matrix (VRTM)
D=Demonstration, I=Inspection, A=Analysis, T=Test, N/A and X = Not Applicable
Test Phase and Methodology
Test
Reqmt ID Paragraph No. Requirement FAT OT SAT Remarks
ID
(Contractor) (WJHTC) (Key Site)
FPR031 3.2.2.3.1 The NIDS DASI interface shall[FPR031] store D D D
(replacing older data) the eight bytes
representing the C&G DASI integer,
decimal, and fraction.
FPR032 3.2.2.3.2 The decoded digital message from the D D X
DME DASI shall[FPR032] be a stream of
ASCII data containing the DME DASI
messages in the format shown below:
FPR033 3.2.2.3.2 The NIDS DASI DME interface D D D
shall[FPR033] store (replacing older data) the
five bytes representing the DME DASI
integer, decimal, and fraction.
FPR034 3.2.2.4 The data flow shall[FPR034] be one-way, I I I
from the DASI to NIDS system.
FPR035 3.2.2.4 The NIDS system display application D D D
shall[FPR035] replace the old message with
the new message.
FPR036 3.2.2.4 The NIDS system display application D D D
shall[FPR036] display the DASI data, and
disseminating the data throughout the
remainder of the NIDS system in
accordance with the NIDS specification.
19
Attachment J-7 DTFAWA-09-R-00462
November 23, 2009 NAS-IR-82153118
Table 4-1. Final Program Requirements (FPR) Verification Requirements Traceability Matrix (VRTM)
D=Demonstration, I=Inspection, A=Analysis, T=Test, N/A and X = Not Applicable
Test Phase and Methodology
Test
Reqmt ID Paragraph No. Requirement FAT OT SAT Remarks
ID
(Contractor) (WJHTC) (Key Site)
FPR037 3.2.2.5 Priority – The NIDS DASI interface and A A A
application processing shall[FPR037] be
implemented in such a way as to guarantee
the update of data at a category equivalent
to Essential as defined in the NAS-SS-
1000.
FPR038 3.2.2.5 Urgency – Within 3 seconds of receiving T T T
DASI data, the data shall[FPR038] be stored
and displayed on the NIDS.
FPR039 3.2.2.5 Importance – The DASI data is considered D D D
dynamic data which shall[FPR039] have a
priority over any static data changes.
FPR040 3.2.2.5 Data integrity – The NIDS DASI interface D D D
shall[FPR040] perform error checks as
defined in section 3.2.2.6.
FPR041 3.2.2.5 Expected Bit Error Rate – The expected bit A A A
error rate shall[FPR041] be less than 10E-06.
FPR042 3.2.2.5 Latency – This interface is a hardwired T T T
connection, the latency shall[FPR042] be
measured from the time the DASI outputs
the data to the time the data is displayed on
the NIDS.
FPR043 3.2.2.5 This value shall[FPR043] not exceed 3 T T T
seconds.
20
Attachment J-7 DTFAWA-09-R-00462
November 23, 2009 NAS-IR-82153118
Table 4-1. Final Program Requirements (FPR) Verification Requirements Traceability Matrix (VRTM)
D=Demonstration, I=Inspection, A=Analysis, T=Test, N/A and X = Not Applicable
Test Phase and Methodology
Test
Reqmt ID Paragraph No. Requirement FAT OT SAT Remarks
ID
(Contractor) (WJHTC) (Key Site)
FPR044 3.2.2.6 The NIDS DASI interface shall[FPR044] store D D X
and process for display purposes any
identical message received three
consecutive times from the DASI,
providing the message bytes have valid
parity, are of the correct length, and fall in
the range of 27 to 32.
FPR045 3.2.2.6 If these conditions are not satisfied, the D D x
NIDS system display application
shall[FPR045] coast the last good DASI value
until the conditions listed above are
satisfied.
FPR046 3.2.2.6 If the conditions listed above are not T T X
satisfied for a period of 2.5 minutes, the
NIDS system display shall[FPR046] display
“ERROR” for the DASI value.
FPR047 3.2.2.6 A bit or value shall[FPR047] be sent to an D D D
NIDS Monitoring Application indicating
that the interface has failed and an error
message with the current data and time
shall be written to a DASI specific event
log
21
Attachment J-7 DTFAWA-09-R-00462
November 23, 2009 NAS-IR-82153118
Table 4-1. Final Program Requirements (FPR) Verification Requirements Traceability Matrix (VRTM)
D=Demonstration, I=Inspection, A=Analysis, T=Test, N/A and X = Not Applicable
Test Phase and Methodology
Test
Reqmt ID Paragraph No. Requirement FAT OT SAT Remarks
ID
(Contractor) (WJHTC) (Key Site)
FPR048 3.2.3.1 The NIDS DASI interface applications D D D
layer service shall[FPR048] control and
process the received DASI data that is sent
over the interface in accordance with
paragraph 3.2.2.2 through paragraph
3.2.2.6 of this document.
FPR049 3.2.3.1 In addition, for the C&G DASI the NIDS D D D
DASI interface application software
shall[FPR049] support a data rate of 300 bits
per second, using Mark parity, a 7-bit word
length, and two stop bits.
FPR050 3.2.3.1 For the DME DASI the NIDS DASI D D D
interface application software shall[FPR050]
support a data rate of 110 bits per second,
using even parity, a 7-bit word length, and
one stop bit.
FPR051 3.2.3.2.2 For the physical layer the interface point I I I
for connecting the NIDS system to the
DASI system shall[FPR051] be a shielded
twisted pair cable coming from the DASI
sensor translator unit.
FPR052 3.2.3.2.2 There shall[FPR052] be a separate FSK I I I
demodulator for each connection to a
server or workstation to demodulate the
incoming DASI FSK signal.
22
Attachment J-7 DTFAWA-09-R-00462
November 23, 2009 NAS-IR-82153118
Table 4-1. Final Program Requirements (FPR) Verification Requirements Traceability Matrix (VRTM)
D=Demonstration, I=Inspection, A=Analysis, T=Test, N/A and X = Not Applicable
Test Phase and Methodology
Test
Reqmt ID Paragraph No. Requirement FAT OT SAT Remarks
ID
(Contractor) (WJHTC) (Key Site)
FPR053 3.2.3.2.2 For redundant servers, the DASI signal I I I
shall[FPR053] be split at the NIDS side.
FPR054 Both the redundant server configuration T T T
and the workstation configuration
shall[FPR054] be tested to ensure that the
NIDS can accurately process and display
the DASI data.
FPR055 3.2.3.2.4 The NIDS DASI interface data link layer A A X
shall[FPR055] use an FSK demodulator to
demodulate the incoming analog FSK
signal into a digital data stream.
FPR056 3.3 The DASI FSK signal shall[FPR056] be D D D
converted to a digital data stream for use by
the NIDS DASI interface application.
FPR057 3.3 To decode the FSK signal to a digital data I I I
stream, a FSK demodulator shall[FPR057] be
used.
FPR058 3.3.1 The NIDS DASI FSK demodulator T T T
shall[FPR058] operate over an input range of
0 to -30 dbm measured into a 600 ohm
load.
FPR059 3.3.1 The FSK demodulator shall[FPR059] have an A A A
input impedance of 1 mega ohm or greater.
23
Attachment J-7 DTFAWA-09-R-00462
November 23, 2009 NAS-IR-82153118
Table 4-1. Final Program Requirements (FPR) Verification Requirements Traceability Matrix (VRTM)
D=Demonstration, I=Inspection, A=Analysis, T=Test, N/A and X = Not Applicable
Test Phase and Methodology
Test
Reqmt ID Paragraph No. Requirement FAT OT SAT Remarks
ID
(Contractor) (WJHTC) (Key Site)
FPR060 3.3.1.1 The connectors used on the digital portion I I I
of this interface shall[FPR060] be standard
DB9 or DB25 connectors as applicable
with cable strain relief mounting.
FPR061 3.3.1.1 The connectors used on the analog side I I I
shall[FPR061] match the equipment that they
attach to.
FPR062 3.3.1.2 The NIDS DASI interface shall[FPR062] I I I
utilize shielded twisted pair cables to
provide connectivity.
FPR063 3.3.1.2 The cable shall[FPR063] be connected as I I I
shown in Table 3.3.1.2-1 below with the
shield attached on the DASI side only.
FPR064 3.3.1.2 The cable used for this interface I I I
shall[FPR064] be plenum rated.
FPR065 3.3.1.4 Standard Screw in fasteners shall[FPR065] be I I I
used on the DB9 or DB 25 connectors.
FPR066 3.3.1.5 The cabling for the interface shall[FPR066] A A A
have the same electromagnetic
requirements as the NIDS system for both
emissions and susceptibility.
24
Attachment J-7 DTFAWA-09-R-00462
November 23, 2009 NAS-IR-82153118
5 PREPARATION FOR DELIVERY
There are no special delivery instructions for this interface. All delivery instructions are
contained in the Statement of Work for the system.
6 NOTES
There are no specific notes for this interface.
6.1 Definitions.
The following definitions apply to the terms and acronyms used in this IRD:
6.1.1 Analysis.
This method of verification consists of comparing hardware or software designs with
known scientific and technical principles, procedures, and practices to estimate the
capability or the proposed design to meet the mission and system requirements.
6.1.2 Demonstration.
Demonstration is a method of verification where qualitative determination of properties is
made for an end-item, including software and/or the use of technical data and
documentation. The items being verified are observed, but not quantitatively measured, in
a dynamic state.
6.1.3 Inspection.
Inspection is a method of verification used to determine compliance without the use of
special laboratory appliances, or services. Inspection consists of nondestructive
static-state examination of the hardware, software, and/or the technical data
documentation.
6.1.4 Test.
Test is a method of verification wherein performance is measured during or after the
controlled application of functional and/or environmental stimuli. Quantitative
measurements are analyzed to determine the degree of compliance. The process uses
laboratory equipment, procedure, and/or services.
6.1.5 Subsystem Level Verification.
This level of verification is usually accomplished at the contractor's facility and
culminates in the formal acceptance of the contractual end item.
25
Attachment J-7 DTFAWA-09-R-00462
November 23, 2009 NAS-IR-82153118
6.1.6 Integration Level Verification.
This level of verification is conducted at the William J. Hughes Technical Center, or at a
key site. The verification conducted determines if the hardware, software, or subsystem
to be deployed for site installation performs corretly in a NAS environment and in
accordance with NAS system level operational and functional requirements.
6.1.7 Site Level Verification.
This level of verification is usually performed at the designated site. The verification
portion of the subsystem installation and checkout emphasizes the demonstration of the
overall system performance requirements. It includes the demonstration of a system
subsystem, or end-item, final acceptance demonstrations, and commissioning activities.
6.1.8 Transfer Time.
The transfer time specifies the required performance characteristics imposed on both
application processes.
6.1.9 System Specification
The system specification refers to the specification that contains the requirements for the
end users system. For example if this document were used to connect the external
systems to an information display system, the system specification would be the
specification used for the information display system.
26
Attachment J-7 DTFAWA-09-R-00462
November 23, 2009 NAS-IR-82153118
6.2 Abbreviations and acronyms
ANSI American National Standards Institute
AP Application Process
ASCII American Standard Code for Information Interchange
ASI Altitude Setting Indicator
DASI Digital Altimeter Setting Indicator
EIA Electronic Industries Association
FAA Federal Aviation Administration
ISO International Organization for Standardization
NAS National Airspace System
NIDS NAS information Display System
OSI Open Systems Interconnection
VRTM Verification Requirements Traceability Matrix
WJHTC William J. Hughes Technical Center
27