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v Speed (10 Mbps or 100 Mbps)
v Status of the connection
Additionally, each CP has its own Ethernet port. You can choose to connect the
Ethernet ports to each other through an Ethernet switch or to connect them to
separate networks for greater availability. Each CP has its own unique IP address
and is accessible independent of the other CP.
Serial ports
Each CP comes with two serial ports. The top serial port on the installed CP is an
RS-232 port that is used for remote dial-in. The bottom port is used for accessing
the console.
Numbering
The 2109 Model M12 employs a numbering scheme that progresses from left to
right and bottom to top in numerical order. The reference location is from the cable
side of the chassis.
v Blade assemblies are numbered from 1 - 10, from left to right.
v Ports are numbered from 0 - 15, from bottom to top.
v Power supplies are numbered from 1 - 4, from bottom to top.
v Blowers are numbered from 1 - 3, from left to right.
Rack mounting
The mechanical design of the 2109 Model M12 allows rack mounting with either the
cable side or the noncable side facing the front of the equipment rack. The chassis
fits into a standard 19-inch EIA rack. Each chassis measures:
v 43.74 cm (17.22 in.) wide
v 70.87 cm (27.9 in.) deep (without the door)
v 61.24 cm (24.11 in.) high (less than 14U)
Cooling system
The 2109 Model M12 uses a redundant system of three hot-swappable blowers.
Cool air intake is from the noncable side of the chassis, is pressurized, and is
forced through the system. Heated air exits at the top of the cable side of the
chassis. Three blowers that are used in conjunction with a pressurized plenum cool
the unit. Each blower assembly includes a blower control assembly, which provides
the following features:
v Blower status LEDs
v Blower speed sensing
v Blower speed control
v Serial electronically erasable programmable read only memory (EEPROM) that
v Inlet air temperature monitoring
The 2109 Model M12 operates indefinitely if a single blower fails. When a blower
assembly is removed, a mechanical flap seals the air chamber to maintain positive
cooling air pressure in the chassis while the failed blower assembly is being
replaced.
6
IBM TotalStorage SAN Switch: 2109 Model M12 User's Guide
contains the part number, revision level, and error logs for the blade assembly
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