Requirements for accessing kernel services using TSO/E

To access kernel services using TSO/E, you need the same hardware as other z/OS components. You also need the workstation connections that TSO/E uses and the processor and network connections that JES2 or JES3 uses. Network connections can be made through:

Systems Network Architecture (SNA) network: Configure the workstation hardware and software to access TSO/E through z/OS® Communications Server, formerly known as Virtual Telecommunications Access Method (VTAM®).The system requires no additional network definitions for access to z/OS UNIX through TSO/E.
TCP/IP network: Configure the workstation hardware and software to communicate with z/OS Communications Server, . For the Telnet (TN3270) server, define the Telnet VTAM parameters.
rlogin or telnet: For rlogin or telnet, configure the workstation hardware and software to communicate with z/OS Communications Server. If you use rlogin, you might need additional network capacity to support additional rlogin users.

Figure 1 shows an example of workstation and network connections for the z/OS system with kernel services.

Figure 1. Example of workstation and network connections. How workstations and networks connect to the z/OS system with kernel services

Table 1 shows several ways that you can access the z/OS UNIX shells:

The TSO/E OMVS command, which provides a 3270 interface
The rlogin command, which provides an ASCII interface
The telnet command, which provides an ASCII interface

When you first log in to one of the z/OS UNIX shells, you are in line mode. Depending on how you access the shell, you might be able to use utilities that require raw mode (such as vi) or run an X-Windows application.

Line mode: Input is processed after you press <Enter>. Line mode is also called canonical mode.
Raw mode: Each character is processed as it is typed. Raw mode is also called non-canonical mode.
Graphical: A graphical user interface for X-Windows applications.

Table 1. Accessing z/OS UNIX
Terminal	Software at the terminal	Connection to the host	Shell access	Supported modes
3270		Front-end processor such as 3174 or 3172	OMVS (TSO command)	Line
Workstation	3270 emulator (such as pc3270 or tn3270)	Front-end processor such as 3174 or 3172	OMVS (TSO command)	Line
	rlogin or telnet client	Front-end processor such as 3174 or 3172	rlogin or telnet	Line or raw
	X-Window server	Front-end processor such as 3174 or 3172	X-Window client	Graphical
X-terminal	rlogin or telnet client	Front-end processor such as 3174 or 3172	rlogin or telnet	Line or raw
X-terminal	X-Window server	Front-end processor such as 3174 or 3172	X-Window client	Graphical

Noncanonical mode cannot be used with a 3270 because a 3270 does not send data until ENTER, PA, CLEAR, or PF keys are pressed.