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G.704 is an ITU-T standard for synchronous frame structures used at 1544, 6312, 2048, 8448 and 44 736 kbit/s hierarchical levels.

G.704 gives functional characteristics of interfaces associated with:

  • network nodes, in particular, synchronous digital multiplex equipment and digital exchanges in IDNs for telephony and ISDNs; and
  • PCM multiplexing equipment.

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