T70NL
The ITU-T recommendation T.70NL," NL" stands for Network Layer, specifies the link layer backup protocol and network protocol forTeletex. In general, T.70 is to be seen as a connection ofX.25 for use over circuit switching networks. Thus, T.70NL represents a largely simplified version of the Packet Level Protocol( PLP) of X.25, X.25PLP.