Diagram
Purpose
Depicts the system architecture from a physical point of view.
Example
Here is an example Physical Architecture Diagram.
Description
This diagram provides the means of showing the physical structure of some or all of a system at a particular level. The PAD shows the physical flows between the system components at the level of interest.
Every symbol in the diagram represents something physical, including paths through which data passes. Therefore, a data link on a PAD corresponds to a physical interface connection, i.e., cable, bus, etc.
Strengths
The PAD is ideal for depicting the high level (and lower if desired) system architecture layout for project presentations and working documents. This layout also reflects system usage within the context of its environment. The PAD represents the initial layout of the critical interface definition activity as well. The user can view the system from a totally physical perspective without worrying about fuctionality and detailed data flows.
Weaknesses
The PAD does not provide insight into the system functionality and detailed data flow between system elements or items.
Recommended Uses
-
Developing high level system context diagrams
-
Establishing high-level interface requirements between system components
-
Defining and communicating system hardware needs early in the project
-
Performing system roll-up requirements for such performance parameters as weight, size, power.
Characteristics
APPEARS IN MODELS |
Implementation |
NUMBERING |
Numbered as are PAD symbols that can be expanded. |
HIERARCHICAL |
Yes |
Linkage
Symbols
| Symbol |
Name |
Description |
Definition |
Expansion |
 |
Comment |
Makes a note anywhere in the diagram. Always surrounded by * characters. |
None |
None |
 |
Boundary point |
A connection point for the initial transition to enter the initial state. |
None |
None |
 |
Terminator |
Represents the external system, users or environment with which this system interacts. |
Terminator Description |
None |
 |
Bus |
Represents a network bus for passing data from one piece of physical equipment to another. |
PSpec |
PAD |
 |
Equipment |
Represents a piece of hardware equipment within the system construct. |
PSpec |
PAD
DFD
BD
UCD |
 |
Library equipment |
Represents a piece of shared hardware equipment within the system construct. |
PSpec |
PAD |
 |
Picture |
Allows you to choose the location of a GIF or JPEG image to be displayed as a diagram symbol or to be embedded in an existing diagram symbol. |
None |
None |
 |
Link |
Represents an interface link between two physical pieces within the construct |
DD Entry |
None |
|
