標準號：ONORM ENV 41802-4-1993
中文標準名稱：信息系統互連．X．25協議中繼．用于永久性存取范圍內虛擬呼叫的PSDN子網絡相關介質的相關要求
英文標準名稱：Information Systems Interconnection - X.25 Protocol Relaying - PSDN subnetwork dependent media dependent requirements for Virtual calls over a permanent access
發布日期：1993/2/1 12:00:00
實施日期：1999/12/31 12:00:00
適用范圍：Tlüs part of thls Functlonal Standard specific? subnetwork-type dependent media dependent requlrements applicable to an Interworklng unlt uslng Virtual calls over a permanent access to a PSDN. The Operation of an Interworklng unlt may involve relaylng from one subnetwork to another, and those subnetworks need not be of the same type. Thls part of thls Functlonal Standard appUes only to Communications uslng PSDN subnetworks with permanent access on whlch Virtual calls are used.