Mediant 1000B Survivable Branch Appliance Enhanced, Basic Chassis with SSD for Microsoft LyncIncludes Mediant 1000B chassis, three pairs of GE ports, single AC power supply, fans, OSN3 (SSD to support up to 1000 users) and SSD pre-installed with Microsoft SBA application. Chassis can be expanded with any Mediant 1000 PSTN modules such as FXS/FXO/BRI or T1/E1 support up to 1000 users.