The ADTRAN OSU 300 is a point-to-point fiber product that operates up to 44.2 Mbps, providing users up to four DTE data ports. This multiport OSU provides access to private single mode fiber and allows users to share the bandwidth between multiple applications. The OSU 300 is the latest in a series of broadband access products from ADTRAN. The OSU 300 has one HSSI (High Speed Serial Interface) port built into the chassis. Expansion slots for up to three additional DTE interfaces accept optional field-upgradeable interface cards. The cards can be either HSSI, high-speed V.35, or DSX-1. The HSSI ports support rates from 75 kbps to 44.2 Mbps, while the high-speed V.35 ports support rates from 75 kbps to 10 Mbps; both in 75 kbps increments. Each DSX module has four DSX-1 interfaces and up to three DSX-1 modules can be supported in a chassis. The OSU 300 offers complete configuration, diagnostic, and performance monitoring through a VT 100 terminal, SNMP, or Telnet.A series of front panel LEDs indicate the status of the network connection, along with the state of each of the four DTE ports. SNMP traps notify SNMP management platforms of alarm conditions. External alarm contacts provide connection to a visual or audible alarm. The OSU 300 includes VT 100 terminal interfaces on both front and rear panels. Inband access to a remote unit across the fiber can be performed manually by the user, or automatically by the host OSU 300 unit. Time-of-day automatic reconfiguration allows customers to assign or reallocate bandwidth to applications based on the time of day, ensuring that the broadband circuit is always optimized. Embedded SNMP and Telnet are available through either the 10baseT Ethernet port or the SLIP/PPP port. The OSU 300 can be configured, monitored, and diagnosed using standard SNMP network management programs, such as Hewlett Packard's OpenView, IBM's NetView, and Cabletron's Spectrum. ADTRAN's ADVISION, a GUI interface for HP OpenView, can be used to manage the OSU 300, as well as other ADTRAN SNMP products.