HP StorageWorks 2/128 HP StorageWorks Core Switch 2/64 and SAN Director 2/128 - Page 123
Setting up and installing modems, Using high-availability connectivity
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5 Setting up and installing modems This chapter provides the following topics: • Using high-availability connectivity, page 123 • Connecting modems, page 125 • Setting up a remote modem system, page 126 • Verifying the modem connection, page 127 Each CP card in the Core Switch 2/64 and SAN Director 2/128 contains a modem serial port for connection to a Hayes-compatible modem. The modem serial ports are wired as standard Data Termination Equipment (DTE) ports and have the same commands, log in capabilities, and operational behavior as the terminal serial ports. However, asynchronous informational messages and other unsolicited text are not sent to the modem ports. No additional software is required to use modems with the Core Switch 2/64 or the SAN Director 2/128. CAUTION: The Core Switch 2/64 and SAN Director 2/128 detect modems only during power-on, reboot, or a CP card failover sequence. HP recommends setting up the modems before powering on the switch. For increased security, any active modem sessions are automatically disconnected if the modem cable is disconnected. For optimal security, disconnect the modem cable when it is not in use. Using high-availability connectivity You can ensure high availability of a modem connection by connecting a separate modem to each CP card and then connecting both modems to a shared telephone line (see Figure 29). This ensures an available telephone connection to the active CP card even if a failover occurs; however, you will need to log back in after a failover. When both CP cards are connected to a shared telephone line, callers automatically dial in to the active CP card, which answers on the first ring. If the active CP card cannot answer for any reason, the standby CP card answers on the seventh ring and allows login to proceed. Core Switch 2/64 and SAN Director 2/128 installation guide 123