1. System Interface Description – step-by-step instructions and templates
SV-1 Template
System Interface Description – step-by-step instructions and templates
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2. Four Steps in developing your SV-1 Step 1 - Identify the Product's Timescale
Decide on the timescale that this product is expected to represent (as-is, to-be, transitional)
Multiple timescales are often needed for each product; a separate SV-1 should be produced for each timescale that is needed

3. Step 2 - Identify the required SV-1 perspectives (Inter-nodal, Intra-nodal and/or Intra-system)
Decide on the perspectives required to satisfy the architecture’s objective
Inter-nodal - Identifies system nodes and system interfaces between the nodes
Intra-nodal - Identifies system to system interfaces within a node
Intra-system - Decomposes each system to identify its internal components

4. Step 3 - Identify Components from your OV-2
From your OV-2 identify & list Operational nodes and needlines that are or will be physically implemented in the architecture
Identify & list System nodes and interfaces that are or will be physically implemented in the architecture
Convert needlines to systems interfaces by identifying the system linkages that will physically implement the operational needlines

5. Step 4 - Illustrate System Interface Description
Illustrate the system nodes as icons in a diagram, usually as annotated rectangles
Connect the system nodes with arrows or lines to depict the interfaces among them
If necessary, enter a textual description of each system interface line on the diagram

6. Templates Two templates have been provided, following this slide
First template is for inter-nodal diagrams
Copy, delete, move or amend nodes as required
Change, delete or add text as required
Use connectors to depict interfaces
Duplicate the slides as needed
Second template can be used for either intra-nodal or intra-system perspective diagrams
Delete the instruction slides when SV-1 completed

7. SV-1 Inter-Nodal template
NODE/HQ/UNIT/PLATFORM NAME
SYSTEMS
SYSTEM A
SYSTEM B
SYSTEM C
MEANS
ISDN
PSTN
SATCOM HF
UHF
VHF
MODES
VOICE
FAX
DATA
MSG
NODE/HQ/UNIT/PLATFORM NAME
SYSTEMS
SYSTEM A
SYSTEM B
SYSTEM C
MEANS
ISDN
PSTN
SATCOM HF
UHF
VHF
MODES
VOICE
FAX
DATA
MSG
UNIT/PLATFORM NAME
MEANS
ISDN
PSTN
SATCOM HF
UHF
VHF
MODES
VOICE
FAX
DATA
MSG
Interface A
Interface B
NODE/HQ/UNIT/PLATFORM NAME
SYSTEMS
SYSTEM A
SYSTEM B
SYSTEM C
MEANS
ISDN
PSTN
SATCOM HF
UHF
VHF
MODES
VOICE
FAX
DATA
MSG
UNIT/PLATFORM NAME
MEANS
ISDN
PSTN
SATCOM HF
UHF
VHF
MODES
VOICE
FAX
DATA
MSG
UNIT/PLATFORM NAME
MEANS
ISDN
PSTN
SATCOM HF
UHF
VHF
MODES
VOICE
FAX
DATA
MSG

8. SV-1 Intra-Nodal &/or Intra-System template
NODE or SYSTEM Name
VERTICAL DISTRIBUTION PANEL
COMPONENT OR SYSTEM
Example SWITCH
Example Crypto
Interface Box
NEXT NODE or SYSTEM Name
COMPONENT OR SYSTEM
Example SWITCH
Example Crypto
VERTICAL DISTRIBUTION PANEL
NEXT NODE or SYSTEM Name
COMPONENT OR SYSTEM
COMPONENT OR SYSTEM
HORIZONTAL DISTRIBUTION PANEL
Example MODEM
NEXT NODE or SYSTEM Name