Vdl mode 4 protocol adopts s - tdma , regards slot as the base unit of data transmission , and manages slots into superframe 最后,本文实现的vdl - 4协议栈通过对项目的测试实验和opnet仿真得到验证。
百科解释
Superframe is an older framing standard for T1s. Also called D4 or D3/D4 framing.