Also, the synchronous data link control (SDLC) pro-tocol and the remote communication access method VTAM are introduced.
本文还简要地介绍了同步数据键路控制(SDLC)规程以及远程通信访问法VTAM。
英语百科
Access method
An access method is a function of a mainframe operating system that enables access to data on disk, tape or other external devices. They were introduced in 1963 in IBM OS/360 operating system. Access methods provide an application programming interface (API) for programmers to transfer data to or from device, and could be compared to device drivers in non-mainframe operating systems.