HP AA-RS2WC-TE, Installation Manual

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Setting Up and Configuring Modems
216 Core Switch 2/64 V4.1 Installation Guide
Setting Up and Installing Modems
Each CP card in the Core Switch 2/64 contains a modem serial port for connection
to a Hayes-compatible modem. The modem serial ports are wired as standard
DTE ports and have the same command, 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.
Note: The Core Switch 2/64 detects modems only during power-on, reboot, or a CP
card failover sequence. HP recommends setting up the modems before powering on
the Core Switch 2/64 or connecting it to the fabric.
High availability of the modem connection can be ensured by connecting a
separate modem to each CP card, and then connecting both modems to a shared
telephone line, as shown in
Figure 46 . This ensures an available telephone
connection to the active CP card even if a failover occurs; however, it is necessary
to log back in after a failover. When both CP cards are connected to a shared
telephone line, callers are automatically dialed into 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.
After the modems are connected, you can use a telco system to dial-in to the
modems and verify that they answer and dialogue as expected. If a dial-out
modem facility is not available, you can use a terminal emulation program on a
computer that has an attached modem. See
Setting Up a Remote Modem System ,
on page 220 for instructions on setting up a remote modem for testing purposes.
For security reasons, the modem session is automatically disconnected if the
modem cable is detached while a session is active.