Specifies the requirements for Network Layer and Data Link Layer that apply specifically to configurations involving access to an ISDN subnetwork for B-channel X.25 DTE to DCE operation (Semi-permanent or Circuit-mode service).
Status : WithdrawnPublication date : 1995-12
Edition : 1
Technical Committee:Information technology
A standard is reviewed every 5 years
Revisions / Corrigenda
ISO/IEC ISP 10609-21:1995