The Cisco MDS 9120 is a 20 port Fiber Channel switch. It is packaged in a 1 RU enclosure with redundant hot-swappable power supplies and fan modules. Management access is provided through 10/100 Ethernet and serial console interfaces.PRODUCT FEATURES:High port density at 20 ports per 1 RU;Port interfaces that support field-replaceable, hot-swappable small form-factor pluggable (SFP) transceivers;Redundant and hot-swappable power supplies and fan modules for high availability;Front to back airflow;Cisco MDS SAN-OS multi-layer intelligent software;Full compatibility with the rest of the Cisco MDS 9000 Family.