It describes physical layer information flows according to the B-ISDN Protocol reference model 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。

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This Recommendation is based on the ISDN protocol reference model as defined in Recommendation I. 320, and wherever not explicitly indicated, it should conform with Recommendation I. 320.

本建议以I . 320建议规定的ISDN协议参考模型为基础，本建议没有明确、指示的部分均遵照i . 320建议的规定。

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This Recommendation is based on the ISDN protocol reference model as defined in Recommendation I. 320, and wherever not explicitly indicated, it should conform with Recommendation I. 320.

本建议以I . 320建议规定的ISDN协议参考模型为基础，本建议没有明确、指示的部分均遵照i . 320建议的规定。

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