... Multi-Service Access Multiplexer/PCM, which provide flexible voice, data port. Application Feature Within its 30 universal I/O slots ... Access Multiplexer/PCM, which provide flexible voice, data port. PCM30F-MST: Compact 1U shelf Modular Multi Service Access Multiplexer with optical ... ports E1, 4 port Ethernet, 30 line voice, data port service . PCM8: Compact 1U shelf PCM, E1 uplink , 8 line FXS/ ...