Ansi/tia-921-b network Model for Evaluating Multimedia Transmission Performance Over the Internet Protocol

IP Network Impairment Level Requirements

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5IP Network Impairment Level Requirements

An implementation of the network model shall create impairments that conform to the impairment levels specified in this section.

5.1Service Test Profiles

Table represents service test profiles and the applications, node mechanisms and network techniques associated with them. ITU-T Y.1541 uses a similar approach, but a one-to-one mapping to these service profiles may not be possible.
Table : Service Test Profiles (from ITU-T Y.1541)

Service Test Profiles	Applications (Examples)	Node Mechanisms	Network Techniques
WellManaged IP Network (Profile A)	High quality video and VoIP, VTC (Real-time applications, loss sensitive, jitter sensitive, high interaction)	Strict QoS, guaranteed no over subscription on links	Constrained routing and distance
Partially-Managed IP Network (Profile B)	VoIP, VTC (Real-time applications, jitter sensitive, interactive)	Separate queue with preferential servicing, traffic grooming	Less constrained routing and distances
Unmanaged IP Network, Internet (Profile C)	Lower quality video and VoIP, signaling, transaction data (highly interactive)	Separate queue, drop priority	Constrained routing and distance
	Transaction data, interactive	Separate queue, drop priority	Less constrained routing and distances
	Short transactions, bulk data (low loss)	Long queue, drop priority	Any route/path
	Traditional Internet applications (default IP networks)	Separate queue (lowest priority)	Any route/path

Table shows industry accepted end-to-end LAN-to-LAN impairment levels, including LAN and access, that correspond to the Service Test Profiles. The total packet loss shown is the sum of the sequential packet loss and random packet loss. Note that service provider SLAs only guarantee characteristics of the core section of the network.

Table : End-to-End LAN-to-LAN Impairment Levels per Service Test Profile

Impairment Type	Units	Profile A WellManaged Range (min to max)	Profile B Partially-Managed Range (min to max)	Profile C Unmanaged Range (min to max)
One Way Latency	ms	20 to 100 (regional) 90 to 300 (intercontinental)	20 to 100 (regional) 90 to 400 (intercontinental)	20 to 500
Jitter (peak to peak)	ms	0 to 50	0 to 150	0 to 500
Sequential Packet Loss	ms	Random loss only	40 to 200	40 to 10,000
Rate of Sequential Loss	sec^-1	Random loss only	< 10^-3	< 10^-1
Random Packet Loss	%	0 to 0.05	0 to 2	0 to 20
Reordered Packets	%	0 to 0.001	0 to 0.01	0 to 0.1

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