HP 8/20q HP StorageWorks 8/20q Fibre Channel Switch installation and reference - Page 16
Serial port, Power supply and fans
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Serial port The 8/20q Fibre Channel Switch is equipped with an RS-232 serial port for maintenance purposes (Figure 6). You can manage the switch through the serial port using the CLI. 2 1 1 Serial port 2 RS-232 connnector pin identification Figure 6 Serial port and pin identification The serial port connector requires a null-modem F/F DB9 cable. The pins on the switch RS-232 connector (Figure 6) are identified in Table 2. For information about connecting the workstation through the serial port, see "Connect the management station or workstation to the switch" on page 35. Table 2 Serial port pin identification Pin Number 1 2 Description Carrier Detect Receive Data Referrred to as DCD RxD 3 Transmit Data (TxD) TxD 4 Data Terminal Ready (DTR) DTR 5 Signal Ground (GND) GND 6 Data Set Ready (DSR) DSR 7 Request to Send (RTS) RTS 8 Clear to Send (CTS) CTS 9 Ring Indicator (RI) RI Power supply and fans The switch has a single power supply that converts 100-240 VAC to DC voltages for the various switch circuits. Four internal fans provide cooling. The switch monitors internal air temperature, and therefore does not monitor or report fan operational status. Air flow is front-to-back. To energize the switch, plug the power cord into the switch AC receptacle (located on the back of the switch) and into a 100-240 VAC power source. 16