ISO 10030
Connectionless-Mode End System to Intermediate System Protocol
ESC (End-System Connect)
Move the mouse pointer to any protocol field and press the left mouse button.
CONS ES-IS uses different PDU type with this structure:
1. A fixed part, used by all PDU types;
2. following protcol field depending on PDU type (not ENC, ESC, SRH).
ESC consists only of the fixed part and has no additional protocol fields.