Remote Spooling Communications Subsystem (RSCS)[8] is, depending on the release, a component of or extra cost product in VM that provides RJE services.
The initial versions of NJE for JES2, JES3, VSE POWER and VM RSCS used BSC multileaving, but IBM quickly added support for Channel-to-channel adapters.
[10] Early RJE workstations were "dumb" (non-programmable) devices using byte-synchronous communications protocols such as IBM BISYNC or STR, or equivalents from other vendors.
Later still RJE workstations switched to bit-oriented full duplex protocols such as IBM Synchronous Data Link Control, HDLC, or X.25.
A 200 USER Terminal consisted of a low speed punched card reader, a line printer, and a CRT operators console.
However, in large organizations with multiple data centers, there was an interest in a peer-to-peer transfer of, e.g., submitted jobs, printer output.
NJE supports Binary Synchronous Communications (BSC), Channel-to-channel adapter (CTCA), Systems Network Architecture (SNA) and TCP/IP[17] connections among its nodes.