MDA - 7750 SR 16-PT OC3/12-STM1/4 SFP 16-port SONET/SDH OC-12c/STM-4c MDA, each port can operate as OC-12c/OC-3c or STM-4c/STM-1c, accepts up to sixteen (16) OC-12/STM-4, OC-3/STM-1 SFP Optics Modules

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