HP Carrier-grade cc3300 UserÆs Guide and Technical UserÆs Gu - Page 94

USB Connectors (Front Panel) The server board provides two USB ports located behind the bezel. The built-in USB ports permit the direct connection of two USB peripherals without an external hub. If more devices are required, an external hub can be connected to either of the built-in ports. Alarms The alarms port interface is a standard DB15-pin connector (see Figure 28). This connector allows remote display of alarm conditions. Each alarm (Major, Minor, Critical and Power) is the output of a STDT relay contact. A common contact with normally open and normally closed connections is included. Power alarm has just common and normally open contact outputs. The major and minor alarms contain external reset circuits. Table 16 gives the pinout of the telco alarms connector. CAUTION Do not apply more than 60 Volts (maximum) to any pin or combination of pins on the Telco Alarms connector. 1 8 9 15 Figure 28. 15-pin Alarms Connector Table 16. Alarms Connector Pinout Pin Description 1 Minor reset, positive 2 Minor reset, negative 3 Major reset, positive 4 Major reset, negative 5 Critical alarm, normally open 6 Critical alarm, normally closed 7 Critical alarm, common 8 Minor alarm, normally open Pin Description 9 Minor alarm, normally closed 10 Minor alarm, common 11 Major alarm, normally open 12 Major alarm, normally closed 13 Major alarm, common 14 Power alarm, normally open 15 Power alarm, common 94 cc2300 Carrier Grade Server Product Guide