TheI.431/430 Networking standards are recommendations produced by theITU. They are Layer 1 specifications forISDN networks, using either an E1 or T1 circuit. TheI.431 standard is known as the 'PRI Physical Layer' whereas the I.430 is known as the 'BRI Physical Layer'.

• I.430 : Basic user-network interface - Layer 1 specification from the ITU

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