Okay, let's see what that translates out to mean. The standard, TIA-921-A, defines an IP network model and specifies scenarios intended for evaluating and comparing communications equipment connected over a converged network. TIA-921-A uses the same statistical approach as previous network model standards, but it differs from the previous physical-layer (layer 1) standards by focusing on the impact of impairments on Internet Protocol (IP) layer 3 performance. IP streams from any type of network device can be evaluated using this model.
The IP network model consists of many impairment combinations that are scenario based and time varying. The test scenarios combine LAN, access, and core network elements in a realistic way to create Layer 3 IP network impairments that cause packets to experience varying delay, reordering, or loss. These scenarios are based on actual network data provided by anonymous IP service providers and IP network equipment manufacturers.
Examples of the types of equipment that can be evaluated using this model include IP-connected endpoints and PSTN-connected devices through IP gateways. The model includes parameters that can be used to configure and setup suitable emulator equipment. TIA-921-A was formulated under the cognizance of the TIA Engineering Committee TR-30 Multi- Media Access, Protocols and Interfaces Subcommittee TR-30.3, Data Communications Equipment Evaluation and Network Interfaces. To learn more visit this site.