ISDN conformance test system development at COS

Summary form only given. Use of a single set of ISDN specifications, and conformance test systems for these specifications, is crucial for achieving universal interworking of ISDN networks. A standardized conformance testing methodology is currently being developed jointly by ISO and CCITT. The output of this activity is documented as CCITT X.290. The test methodology used in the design of the COS ISDN test system is in accordance with this standard and uses the remote single-layer test method. The initial release of the COS ISDN conformance test system includes capabilities for testing the provision of a connection-mode network service over ISDN packet-mode operation