IEEE 标准容限内以太网转发时延的测试与分析

Based on ethernet delay and ethernet frame rate are briefly introduced, packet loss under the frame rate is analyzed in this paper. The model between a switch under tested (SUT) and a Smartbits card is presented and used for two interconnecting switches, this paper presents that clock frequency error (CFE) between a SUT and a Smartbits card is a leading factor of forwarding delay in an ethernet switch. The formulae of internal forwarding delay and forwarding delay caused by existing CFE are dedu