Microsoft word - st series - datasheet - rev 2.00.doc

The ST unit (Switching and Tunneling) is the equipment of Media Switch family specifically designed to act as an ATC Router, per- forming switching and tunneling functions between serial ports and/or Ethernet ports. It can: Manage up to 24 serial ports (synchronous or asynchronous) Operate with different serial protocols (HDLC, HDLC LAP-B, Integrate advanced remote control functions by FTP, WEB The ST unit, connected to a local area network, acts as a data communications server providing wide-area connectivity. The ST unit supports a wide range of WAN protocols, allowing several different clients to access the data communication server simulta- The ST unit provides up to 6 independent sections, each one with two 10/100 Ethernet ports and 4 high-speed WAN serial ports, thus acting as an intelligent WAN/LAN bridge, a WAN/LAN gateway device, or a remote WAN connectivity unit. Moreover, the SNMP server functionality of the ST unit allows any workstation on the LAN to obtain detailed information from the Thanks to the modular design of the ST unit, it can be easily ex- panded supporting additional communication protocols, thus preserving the user's investment upon technological changes. The ST unit set for Serial Data Synchronization allows to interface WANs which differ in proto-col type, standard (V.24, V.36, etc.), baud rate and/or timing (also using the internal clock). Advanced user-configurable filtering functions can be used to redirect or remove specific datapackets. Used as MUX, the ST unit can connect remote devices, matching each one for protocol, baud rate, electrical standard and/or timing. Connection can be made by LAN or fiber, based on the distance and installation requirement. ST unit is also the ideal solution to centralize serial devices to a remote control center. Different kind of devices can be simultaneously connected, matching each one with the rele-vant serial line characteristics. Data are multiplexed on the IP network connection (also inbonding configuration) to be sent to the remote control station. The unit is fully remotely configurable, by using FTP, WEB, SNMP features or proprietary NMS. Flexible design The unit flexible functional architecture allows its use in several different operative scenarios. In each condition the The unit is made up of max 6 independent sections (each of them with a SC-MCF board, equipped with a 32bit embedded CPU) optimized to manage up to 4 synchronous/asynchronous serial lines and 2 Ethernet ports (also configurable for channel bonding). For each section the communication protocol can be defined, as well as the operating characteristics of each serial line (which can differ in physical characteristics, timing, baud rate, etc.). The ST unit can be configured with 1 to 6 boards, which can be used for independent processing or making them cooperate. So the unit can act as six independent switching/tunneling equipments, but can also implement a unique expandable switching/tunneling equipment, with up to 24 synchronous/asynchronous serial ports and up to 12 Ethernet ports. The unit is endowed with several proprietary communication bus that support high speed data transfer and configu-ration information exchange. Switching/Tunneling functions are fully user-configurable via Remote Control software. Encapsulations The unit manages data exchanged between serial devices and/or Ethernet LAN, by using different encapsulationprotocols. Each section interfaces the serial remote device by using the relevant protocol. Data are extracted and can be ad-dressed to another serial or Ethernet port of the same board (with the same protocol) or a serial/Ethernet port of another board. In the latter case, a different protocol can be used. Reliability and Maintainability ST units plus are: • high reliability; the state-of-the-art architecture and components are designed to achieve a high MTBF, and all its parts can be redundant, to avoid any possible breakdown; optimized maintainability, with redundant modules hot-swap interfaces, thus obtaining an extremely low MTTR (Mean Time to Restore) and a network down time close to zero (99.9999% availability). The unit manages several serial multi-standard lines, performing the following functions: • serial-to-serial, • serial-to-ethernet, • switching/tunneling. Up to 6 SC-MCF boards, each one able to interface: • up to 4 V.24 or 2 V36/V.11 serial ports • up to 2 Ethernet ports 10/100Mbps. S e r i a l p o r t c h a r a c t e r i s t i c s : Each serial port can be set for different type, standard, baud rate or timing: • Baud rate or timing are user configurable (internal clock • ITU-T standard: V.24, V.36 or V.11 (X.21) Local: limited to monitoring functions, by frontal panel LEDs. Remote: configuration and operation monitoring, via LAN. Power distribution relies on two power supplies, in redundant configuration Typical: 220 Vac / 50 Hz Max range: 90 to 264 Vac


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Food and Chemical Toxicology 40 (2002) 1263–1270Effects of caffeine on bone and the calcium economyCreighton University, 2500 California Plaza, Omaha 68178 Nebraska, USACaffeine-containing beverage consumption has been reported to be associated with reduced bone mass and increased fracture riskin some,but not most,observational studies. Human physiological studies and controlled balan

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