J3 meaning

The third level in the Japanese J-carrier digital hierarchy. J-3 runs at a signaling rate of 32.064 Mbps in support of 480 DS-0 channels, which maps J-3 into E-3, the European version. Despite similarities in terms of signaling rates and channel capacities at various levels, J-carrier is not compatible with either E-carrier or T-carrier. See also digital signal hierarchy, DS-0, E-3, E-carrier, J-carrier, and T-carrier.
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