Each Origin200 system ships from Silicon Graphics in either a tower (free-standing) or rackmountable configuration. The tower configuration provides extra cosmetic “skins” (side panels and top-cap) and feet. The rackmountable configuration does not have these cosmetic features and feet, but does provide rackmounting slides, mounting ears, a different front bezel, and two pairs of end-caps (for use in 19-inch and 21-inch equipment racks).

If you wish to change your system from a tower configuration to a rack-mountable configuration, or vice versa, contact Silicon Graphics or your local support provider for information about obtaining a conversion kit.

Table 1-1 summarizes the general features of Origin200:

For additional information about power requirements, see “Power Supply”. For environmental specifications, including operating and nonoperating conditions, see “Physical and Environmental Specifications”.

The Origin200 logic carrier is a sheet-metal tray that holds:

Together, the logic carrier sheet metal, the main system board, and the PCI backplane form a single, field-replaceable unit.

The logic carrier may be serviced only by Silicon Graphics-trained personnel.

Figure 1-4 shows the complete logic carrier assembly.

Figure 1-4. Logic Carrier Assembly

CPU Daughter Card

Figure 1-5 shows the main system board, the CPU daughter card, and points out the locations of various components.

Figure 1-5. The Origin200 Main System Board and CPU Daughter Card

PCI Backplane and Expansion Slots

There are three expansion slots available for peripheral component interconnect (PCI) bus cards. The slots provide PCI IDs 5, 6, and 7. See Figure 1-6.

Boards can be full-size, 32-bit and 64-bit. In addition to providing 5V, the PCI backplane also accomodates 3.3V PCI cards with up to a total of 30 watts of 3.3V power.

Figure 1-6 shows the location and slot numbers of the PCI backplane.

Figure 1-6. PCI Backplane and Slot IDs

Each Origin200 module can have between 32 MB and 2 GB of memory, depending upon the type of dual in-line memory module (DIMM) that you install. DIMMs are installed in sockets that are grouped into two banks of four sockets each. Figure 1-7 shows the layout of the DIMM sockets on the main system board.

Figure 1-7. Layout of DIMM Sockets on the Origin200 Main System Board

Note the following about installing DIMMs in an Origin200 module:

The Origin200 server provides bays for two sizes of internal drive options: 5.25-inch drives and 3.5-inch drives.

5.25-Inch Drives and Drive Bay

The 5.25-inch drive bay can be used for two combinations of drive form-factor:

• one full-height drive

• two half-height drives or two 1-inch drives

The 5.25-inch drives are controlled by SCSI channel 1, and drive IDs are set by jumpers on the drives. Drives are mounted in a removable peripheral carrier, shown in Figure 1-8.

Figure 1-8. Origin200 5.25-inch Peripheral Carrier and Drive Bay

3.5-Inch Drives and Drive Bay

The 3.5-inch drive bay has room for six drives, mounted individually on sleds. The 3.5-inch drives are attached to SCSI channel 0.

Each sled attaches to the 3.5-inch SCSI midplane with SCA connectors. Drive IDs are set by the position of the drive in the drive bay, with ID 1 at the bottom of the drive bay and ID 6 at the top of the drive bay. Figure 1-9 shows a 3.5-inch drive, sled, and drive bay.

Figure 1-9. Origin200 3.5-inch Drive, Sled, and Bay

SCSI Channels and Channel Numbering

There are two SCSI channels in each Origin200 module. Table 1-2 lists the channels in each module and their characteristics.

Table 1-2. SCSI Channel Numbers and Characteristics

First module	Second module	Drives	Description
0	2	3.5-inch	Fast-20 SCSI-II, 16-bit (wide), running at 20 MHz, and capable of transferring 40 MB per second.
1	3	5.25-inch	Fast SCSI-II, 8-bit (narrow), running at 10 MHz, and capable of transferring 10 MB per second.

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Note: SCSI channels in a one module system are fixed at 0 and 1. The master module in a two-module server also uses channels 0 and 1. However, the slave module channel numbers may vary depending upon the order in which they are detected the first time the system is powered on. See “Determining What Devices are Installed On Your Server” in Chapter 4 for an explanation of device detection and numbering.

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Each Origin200 module provides two serial ports capable of transferring data at speeds ranging from 50 baud to 460 Kbaud. The default serial port configuration is RS-232, but the serial ports can be opened programmatically in RS-422 mode. The serial ports can also be used to send and receive MIDI information.

The serial port connectors are DB-9, male, and are designed to be IBM-compatible. Because of this, they do not use the same pinouts as prior Silicon Graphics DB-9 serial ports.

Table 1-3 lists the serial ports and their correspondence to IRIX device files.

Serial ports in a single-module system, and in the master module are fixed at 1 and 2, with port 1 being the system console. See “Determining What Devices are Installed On Your Server” in Chapter 4 for an explanation of device detection and numbering.

The AUX port is a DIN-8 connector that provides access to the module system controller. See “Using the AUX Port and Module System Controller Commands” in Chapter 4.

The parallel port is a 36-pin, high-density connector which meets the IEEE-1284 specification.

Each Origin200 module contains a single RJ-45 connector for 10-Base-T or 100-Base-TX Ethernet. The connector has two integral LEDs that provide basic status. Network speed is automatically negotiated.

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Note: Category 5 wiring is required for proper 100-Base-TX operation.

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Features of the Origin200 power supply are as follows:

Air flow through Origin200 is from the front of the system to the rear, and is drawn by three DC fans located just behind the internal drive bays. Figure 1-10 shows the direction of air flow through Origin200.

Figure 1-10. Air Flow Through Origin200

Table 1-4 lists the various physical and environmental specifications of Origin200.

Multiple Modules and Power Sources

If you are installing a two-module system, both modules must be connected to the same, grounded power source (for example, to the same electrical service entrance or breaker box). See “Power Supply” for the amount of current each power supply draws.

Modules may be on separate circuits, but the circuits must be connected to the same power source and ground.

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Warning: If you do not connect both modules of a two-module system to the same, grounded power source, resulting differences in ground potential (current) can damage components on the Origin200 main system board.

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