Utilities Subsystem

UGUY

The UGUY board is a major component of the utility subsystem. It provides the following functions:

Every cabinet contains one UGUY. The UGUY plugs into the HUCB. It is not hot swappable. Its MP microprocessor controls power monitor functions, executing the power monitor 3 (PM3) firmware and the cabinet-level utility (CLU) firmware.

SBCH

The SBCH, along with the SBC, forms part of the MP function. It provides the physical and electrical interface to the SBC, the fanning out of the Universal Serial Bus (USB) to internal and external subsystems, and a LAN 10/100BT Ethernet connection. It plugs into the HUCB and is hot swappable. Every CPU cabinet contains one SBCH board, but only one SBCH contains an SBC board used as the MP for the complex. The remaining SBCH boards act as USB hubs.

SBC

The SBC board is an embedded PC running System Utility Board (SUB) firmware. It is the core of the Management Processor and plugs into the SBCH board through a PC104 interface.The SBC provides three external interfaces to the Utility Subsystem:

The modem function is not included on the SBC and must be external to the cabinet.

HUCB

The HUCB is the backplane of the Utility Subsystem. It provides cable distribution for all the utility signals except the clocks. It also provides the customer LAN interface and serial ports. The SMS connects to the HUCB. The system “type” switch is located on the HUCB. There are no active circuits on this board. It is not hot swappable.