The Silicon Graphics Onyx2 rack (see Figure 3-1) is a rack system that comes with a multimodule System Controller (MMSC) and provides cable management hardware for CrayLink Interconnect and XIO cables.

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Note: Multirack systems can hold additional compute or graphics modules, and individual hardware components can be added to suit growing graphics, computational, and I/O requirements.

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The Onyx2 dual-rack configurations are shown in Figure 3-2 and Figure 3-3. These configurations can have from 4 to 24 processors and up to four graphics pipes. An example of an Onyx2 multirack configuration (Reality Monster) is shown in Figure 3-4. This configuration can have from 8 to 16 processors and up to eight graphics pipes. (Each graphics pipe requires one node board).

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Note: All RealityMonster (multirack) systems require an Ethernet hub to connect the multimodule System Controllers (MMSCs).

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Figure 3-1. Onyx2 Single-Rack System (8P and 2 Graphics Pipes)

Figure 3-2. Onyx2 Multirack System (16P and 4 Graphics Pipes)

Figure 3-3. Onyx2 Multirack System (24P and 2 Graphics Pipes)

Figure 3-4. Onyx2 RealityMonster Multirack System (16P and 8 Graphics Pipes)

This section describes the DG5 main display board options for the Onyx2 deskside graphics systems. It also describes the VIO5H video option connector panel board, which mounts on the DG5-8 and outputs five high-resolution video channels.

Additionally, this section describes the Serial Digital Video Output from Graphics (GVO) option, which provides additional CCIR601 output on two BNCs.

Table 3-1 summarizes DG5 configurations.

Figure 3-5 shows the location of two optional DG5-8 boards with the VIO5H option daughterboard installed in the graphics module.

Note that the DG5-8 option always requires the VIO5H daughterboard. The DG5 board always goes in the rightmost graphics board slot in each board set (pipe) in the Onyx2 graphics module. Figure 3-6 shows the DG5 board without options (DG5-2).

Figure 3-5. DG5-8 Board Locations

Figure 3-6. DG5-2 Graphics Panel Connections (Without Options)

Connectors on the DG5 Option Board

Figure 3-7 shows connectors on the panel for the DG5-8 option board with the VIO5H daughter board.

Figure 3-7. DG5-8 Board With Optional VIO5H

Figure 3-8 shows the 13W3 pinouts for the monitor connectors on the DG5 I/O panel; each 13W3 uses the same pinout pattern.

Figure 3-8. DG5/VIO5H 13W3 Connector Pinout

In the A1, A2, and A3 connectors, the center conductor carries the video signals. The outer conductors of the A1, A2, and A3 connectors are their video returns, which are tied to the monitor's grounded chassis.

Connectors on the Optional GVO Daughterboard

The graphics-to-video option (GVO) daughterboard comes assembled with the DG5 and is designed to provide direct output from graphics to video in real time.

The GVO daughterboard has two CCIR601 connectors implemented as BNCs. Figure 3-9 shows connectors on the panel for the DG5-8 board with optional GVO daughterboard combination.

Figure 3-9. DG5 With Optional GVO Connectors

Cabling Options

Three cable options are offered for the DG5:

• 13W3-13W3: for use with the Silicon Graphics 24-inch SuperWide monitor and other compatible monitors (see Figure 3-10)

• 13W3-five BNCs: separate connectors for R, G, B, horizontal sync, and vertical sync for monitors that require these separate connectors (see Figure 3-11)

• 13W3-13W3HV: two separate BNC connectors for horizontal and vertical sync (for example, for synchronizing video out “genlocking”)

  Figure 3-10. SuperWide Monitor
  
  

  Figure 3-11. 13W3 Monitor Cable and Adapters
  
  

Each cable ordered connects to a 13W3 port on one of the DG5 boards in the graphics module.

Figure 3-12 shows a connection example with two monitors attached to separate graphics pipes on the Onyx2 rack's graphics module.

Figure 3-12. Cable to Monitor Connection Example

The graphics BaseIO assembly (IO6G) is a graphics-oriented set of interface connectors that comes standard with each Onyx2 rack system. The connectors on the BaseIO include support for Ethernet, two keyboards, analog and digital audio, serial and parallel connectors, and others. The following sections provide location and pinout information on these connectors.

Figure 3-13 shows the connectors and the graphics BaseIO assembly.

Figure 3-13. BaseIO (IO6G) Assembly and Connectors

The BaseIO board supports one IEEE 1284-C 36-pin parallel port connector. The location of this connector is shown in Figure 3-15. Pinouts for the parallel port connector are listed in Table 3-4.

Suitable cables for use with this port should be marked “IEEE 1284-compliant.” For most parallel printers, you can use a cable with an IEEE 1284-C connector at the Onyx2 end and an IEEE 1284-B connector (also known as a Centronics-style) at the printer end.

Figure 3-15. Parallel Printer Port Location

Mouse and Keyboard Ports

Each Onyx2 graphics rack system comes with two keyboard and mouse connectors. Figure 3-16 shows the location of the connectors and their pinouts.

There are two sets of keyboard and mouse connectors on the rear of the graphics BaseIO panel provided with each Onyx2 system. If your system uses one keyboard and mouse, attach them to the primary keyboard and mouse connector ports. These primary ports are located on the right side of the BaseIO panel.

You can plug the keyboard and mouse cables directly into the BaseIO panel. However, in cases where your monitor, keyboard, and mouse are located away from the system, use the included extension cable. Each system comes with a 24-foot (7.3 m) keyboard and mouse extension cable.

Figure 3-16. Keyboard and Mouse Locations and Pinouts

Table 3-5 shows the cable pinout assignments for the keyboard port.

Table 3-5. Keyboard Port (6-Pin mini-DIN) Pin Assignments

Pin	Assignment
1	KEYBOARD DATA
2	(Reserved)
3	GROUND
4	KEYBOARD POWER (+5V)
5	KEYBOARD CLOCK
6	(Reserved)

Table 3-6 shows the cable pinout assignments for the mouse port.

Table 3-6. Mouse Port (6-Pin mini-DIN) Pin Assignments

Pin	Assignment
1	MOUSE DATA
2	(Reserved)
3	GROUND
4	MOUSE POWER (+5V)
5	MOUSE CLOCK
6	(Reserved)

Analog Stereo In and Out (RCA-Type) Ports

Table 3-7 shows the cable pinout assignments for the line level audio (RCA-type) ports.

Table 3-7. Analog Composite Video Port Pin Assignments

Pin	Assignment
(sleeve)	GROUND
(tip)	Line level audio

You may connect audio equipment to the line level inputs and outputs using standard shielded RCA-type connectors (see Figure 3-17). For best results, always route these analog signal cables away from power cords.

The right channel is color coded red, and the left channel is white.

Figure 3-17. Line In and Out Stereo Ports

The graphics BaseIO board comes with four standard 9-pin serial connectors. The connectors are all male and use a PC-compatible signal assignment. Figure 3-18 shows the connector locations and pin assignments.

The RS-232 standard recommends the use of cables no longer than 50 feet (15.2 meters). This standard should also be applied to RS-422 serial use. Longer runs introduce a greater possibility of line noise. This can affect data transmission and cause errors. For cable runs longer than 50 feet (15.2 meters), use an appropriate extender device.

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Note: Do not run cables through areas that are electrically noisy, such as areas where large electric motors, welding apparatus, or X-ray machines operate. Bury outside wiring in a conduit, as lighting strikes can damage the system.

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See Figure 3-19 for a terminal-to-serial port connection example.

Figure 3-18. RS-232/RS-422 Serial Connectors

Figure 3-19. Serial Port Connection Example

Just above serial port three are the single-jack ADAT optical connectors (see Figure 3-20). These ports can be used with multitrack digital audio recording input and output devices.

These connections support optical input and output of eight channels at up to 24 bits and up to 48 KHz sample rates.

Use standard plastic fiber interconnecting cables. You will need two cables; one for input and one for output. The Onyx2 system ships with connector cover plugs over the input and output ports. These must be removed before using the optical connectors. Retain these dust covers for use when shipping or if you discontinue ADAT use.

Figure 3-20. Optical Digital Audio Interface

Figure 3-21 shows the loopthrough and digital audio connectors.

The AES-3id-1995 digital audio connectors support 75 ohm signals at a nominal 1.0 volts (peak-to-peak) signal level. You should use 75 ohm coaxial cable with standard BNC connectors for interconnections (such as with digital video recorders).

Some equipment supporting AES-3id-1995 digital audio signals uses 3-pin XLR connectors that support balanced 110 ohm signals. To successfully interconnect with equipment of this type, install a digital audio “BALUN” adapter at the equipment's XLR connector points. The BALUN adapter connects the 3-pin XLR to a 75-ohm BNC connection. The 75 ohm coaxial cable then connects between the Onyx2 system and the BALUN adapter.

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Note: 110 to 75 ohm digital audio BALUN adapters come in male and female versions. You need one of each type when using both the input and output AES-3id-1995 signal connectors.

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Figure 3-21. Loopthrough and Digital Audio Connectors

A single-ended external 68-pin SCSI connector is provided on the BaseIO panel (see Figure 3-22). This single-ended connector supports both ultra SCSI and SCSI-2 devices. The connector is only single-ended.

Optional additional SCSI ports can be implemented using XIO option boards.

The hyphen preceding a signal name indicates that the signal is low. Note that 8-bit devices that connect to the P-cable leave these signals open: -DB(8), -DB(9), -DB(10), -DB(11), -DB(12), -DB(13), -DB(14), -DB(15), -DB(P1). All other signals are connected as shown in Table 3-8.

Figure 3-22. 68-Pin Single-Ended SCSI Connector

The Onyx2 BaseIO panel uses a 30-foot (9.1 m) three-connector bundled cable to make connection to a microphone and a pair of speakers (included with your Onyx2 system).

Figure 3-23 shows the connection points on the rear of the speakers.

Figure 3-23. Cable Connection Locations on the Speakers

The analog speaker connector plugs into the BaseIO board and the other end goes to the analog speaker plug. The analog speaker power connector goes from the BaseIO to the middle plug on the back of the right speaker (see Figure 3-24).

The microphone connector goes from the BaseIO panel and you plug in your microphone (included) at the other end (look for the microphone logo on the connector).

Figure 3-24. Speaker and Microphone Connections to the BaseIO

Note that there is also a 10-foot (3m) “speaker only” cable included with your Onyx2 system. This 10-foot cable does not supply a microphone plug and limits where you may place the speaker set.

Connections and cables for optional XIO boards are covered in the individual manuals shipped with each product.