Information technology - data communications - x . 25 packet layer protocol for data terminal equipment
2.
Osi information technology - use of x . 25 packet layer protocol to provide the osi connection - mode network service over the telephone network
3.
Osi information technology - use of x . 25 packet layer protocol in conjunction with x . 21 x . 21 bis to provide the osi connection - mode network service
4.
Information technology - telecommunications and information exchange between systems - provision of the connection - mode network internal layer service by intermediate systems using iso iec 8208 , the x . 25 packet layer protocol
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