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I.431�:�Primary rate user-network interface - Layer 1 specification �

Recommendation I.431

In force components
Number
 Title Status
I.431 (03/93)
� 		Primary rate user-network interface - Layer 1 specification � In force
I.431 (1993) Amendment 1 (06/97)
� 		� In force
�
�
Superseded and Withdrawn components
Number
 Title Status
I.431 (11/88)
� 		Primary rate user-network interface - Layer 1 specification � Superseded

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