Multirate Circuit Emulation MIC, 4 Port Channelized OC3/STM1 (down to DS0) or 1 Port Channelized OC12/STM4 (down to DS0) CE MIC forACX 4000, Port 0 can be configured for OC12 which disables Ports 1-3, Requires a pluggable SFP Optics Module Four OC3/STM1 ports Rate-selectable using one of the following rates: 4-port OC3/STM1 1-port OC12/STM4 One channelized OC12/STM4 port (down to DS0) SONET or SDH is configurable on a MIC level SONET channelization: 4 OC3 channel 336 DS1 channels 2016 DS0 channels (combination of nxDS0) SDH channelization: 4 STM1 channel 252 E1 channels 2016 DS0 channels (combination of nxDS0)