====== NET-005 — Reproduce Degraded Communication Conditions ======

[[dido:03-dido-te:99-annexes:annex-c-requirements:03-functional-requirements:03-04-virtual-network-and-communication-requirements:start|Go to C.3.4 Virtual Network and Communication Requirements]]

===== Statement =====

The [[dido:99_annexes:annex-b-terms-and-definitions:d:dido-te|DIDO-TE]] SHALL reproduce each [[dido:99_annexes:annex-b-terms-and-definitions:d:degraded_communication_condition|Degraded Communication Condition]] specified by the governing [[dido:99_annexes:annex-b-terms-and-definitions:t:test_definition|Test Definition]].

===== Source =====

  * [[dido:03-dido-te:99-annexes:annex-b-references:dte-002|[DTE2] Non-Traditional BAA Submission]], testing involving degraded or contested communications environments
  * [[dido:03-dido-te:99-annexes:annex-b-references:dte-003|[DTE3] Broad Agency Announcement White Paper]], testing under degraded or contested communication conditions
  * [[dido:03-dido-te:99-annexes:annex-b-references:dte-001|[DTE1] U.S. Patent Application US20220237111A1]], representation of communication conditions within Virtual Networks

===== Rationale =====

Distributed-system behavior may change when communication differs adversely from its nominal operating condition.

A [[dido:99_annexes:annex-b-terms-and-definitions:d:degraded_communication_condition|Degraded Communication Condition]] represents such a condition without prescribing the particular mechanism that causes the degradation.

The governing [[dido:99_annexes:annex-b-terms-and-definitions:t:test_definition|Test Definition]] specifies the Degraded Communication Conditions required for a test. DIDO-TE reproduces those conditions within the communication environment used for Test Execution.

A Degraded Communication Condition may involve changes to one or more [[dido:99_annexes:annex-b-terms-and-definitions:c:communication_characteristic|Communication Characteristics]]. The specific characteristics, values, or constraints are determined by the governing Test Definition and associated [[dido:99_annexes:annex-b-terms-and-definitions:c:configuration|Configuration]].

This requirement does not imply that every Degraded Communication Condition includes packet loss, increased [[dido:99_annexes:annex-b-terms-and-definitions:l:latency|Latency]], reduced bandwidth, delay variation, disconnection, or another particular network impairment.

The mechanisms used to reproduce the condition remain implementation-neutral.

===== Applies To =====

  * [[dido:99_annexes:annex-b-terms-and-definitions:d:dido-te|DIDO-TE]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:d:degraded_communication_condition|Degraded Communication Condition]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:v:virtual_network|Virtual Network]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:c:communication_characteristic|Communication Characteristic]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:c:communication_parameter|Communication Parameter]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:t:test_environment|Test Environment]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:t:test_definition|Test Definition]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:t:test_execution|Test Execution]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:c:configuration|Configuration]]

===== Verification =====

Verification confirms that:

  - Each Degraded Communication Condition specified by the governing Test Definition can be reproduced.
  - The reproduced condition can be distinguished from the nominal communication condition.
  - The Communication Characteristics affected by the reproduced condition correspond to those specified by the governing Test Definition.
  - Communication impairments not specified by the governing Test Definition are not required by this requirement.
  - The reproduced Degraded Communication Condition is traceable to the governing Test Definition.
  - Reproduction of the condition does not require a particular networking product, network emulator, middleware implementation, or physical network.

Verification includes a Test Definition specifying at least one Degraded Communication Condition and confirms that the specified condition is reproduced during Test Execution.

===== Traceability =====

{{backlinks>.}}

===== ConOps Relationship =====

This requirement supports testing of distributed-system behavior under communication conditions that differ adversely from nominal conditions.

NET-004 governs configuration of specific communication behavior. NET-005 governs reproduction of the Degraded Communication Conditions specified for the test.

===== Delivery Phase =====

TBD

===== Requirement Status =====

Draft

===== Statement Reference =====

<code dokuwiki>
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</code>

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