Application data format for Telnet

The 40 bytes of application data is available for Netstat reports, SMF 119 TCP connection termination reports, or network management interface (NMI) applications. Table 1 shows the application data format used by Telnet.

Table 1. Application data format used by Telnet
Bytes	Description
1-8	The component ID of the TN3270E Telnet server, EZBTNSRV.
9	Blank
10-17	The LU name used to represent the client. This can be blank for non-TN3270E connections that do not have a SNA session.
18	Blank
19-26	The SNA application name. This data is present when a SNA session has been established.
27	Blank
28	The Telnet connection mode: E - TN3270E 3 - TN3270 L - Linemode D - DBCS transform
29	The Client type: T- Terminal P - Printer
30	Blank
31	The security method used for the TCP/IP connection: B - Basic (no security) S - Secureport managed by Telnet T - TTLSport managed by AT-TLS
32-33	The security level: 12 - TLSv1.2 11 - TLSv1.1 T1 - TLSv1 S3 - SSLv3 S2 - SSLv2
34-35	The security cipher used. If the value is 4X, the security cipher must be obtained from offset 37.
36	Blank
37-40	The security cipher that is used if the security method is TTLSport that is managed by AT-TLS; blank otherwise.

The following shows an example of the application data after a SNA session is established.

0000000001111111111222222222233333333334 
1234567890123456789012345678901234567890

EZBTNSRV TCPM1001 TSO10005 ET TT105 0005