X.25 Over an SNA Network: Call Regulation System
Original Publication Date: 1987-May-01
Included in the Prior Art Database: 2005-Feb-01
This disclosure refers to X.25 packet switching over a System Network Architecture (SNA) network. The SNA network is built from communication controllers (CCs), running appropriate programs, linked through a set of Transmission Groups, and managed from host computers. Moreover, the CC performing X.25 functions (X.25 Data Terminal Equipment (DTE) attachment and/or intermediate X.25 switching) must also include specific functions pertaining to X.25 packet switching. The call regulation system depicted below is one of these specific functions. Basically, X.25 packets flow on SNA sessions pre-established in the SNA network between the communication controllers. Sessions set-up is achieved thanks to regular SNA routing mechanisms (Virtual Routes and Explicit Routes) and is activated at network initiation time.