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随着ISDN技术日趋成熟,用户对互操作性的关注已逐渐从专用数据链的实施转移到基于标准的解决方案。尽管其它数据链协议各有其相应的标准,但目前业界普遍接受的互操作性规范为RFC 1618,它详细规定了在ISDN上点到点协议(Point-to-Point Protocol,PPP)的具体使用方法。虽然系统的互操作性至今仍很有限(即使是声称严格遵循标准的厂家也是如此),但用户对互操作解决方案的不断需求,却令该项技术的发展非常迅速。
As ISDN technology matures, user interest in interoperability has gradually shifted from implementation of dedicated data links to standards-based solutions. Although other data link protocols have their own respective standards, the currently accepted industry standard for interoperability is RFC 1618, which specifies the specific use of Point-to-Point Protocol (PPP) over ISDN method. Although system interoperability is still limited (even for manufacturers claiming to adhere strictly to standards), the constant need for interoperability solutions has led to the rapid development of this technology.