It describes physical layer information flows according to the B-ISDN Protocolreferencemodel and identifies interface functions.
它根据B - ISDN协议参考模型描述了物理层信息流并确定了接口功能。
2
This Recommendation is based on the ISDN protocolreferencemodel as defined in Recommendation I. 320, and wherever not explicitly indicated, it should conform with Recommendation I. 320.