Hitachi's AMN 4100 Transmux (Transparent Transponder + Multiplexer) multiplexes lower speed traffic to the OC-192 line rate directly through the DWDM system. It is optimized for best effort data traffic like, IP, ATM or Frame Relay. In its simplest terms the Transmux provides OC-12/12c, and OC-48/48c access, 4:1 time division multiplexing to OC-192 transparent transport, and ITU grid compliant wavelengths.
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