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Chapter 2
Hardware
The LCS Resource Subsystem consists of four main sections. The Power Supply Bay houses a 250 watt power supply which provides power to the subsystem. The ISA Processor Bay contains the 12 or 16 slot segmented passive backplane. The Disk Drive Bay will support up to the maximum number of disk drives defined for the Resource Subsystem. The Auxiliary Junction Panel is an option available only on the 16-slot units which provides space for auxiliary I/O adapter boards to be installed.
Figure 2-1 Resource Eight - Front Panel.
Figure 2-2 Resource Eight - Rear Panel.
All LCS Resource Subsystems contain one 250 watt switching power supply internal to the drawer.
This supply is fan cooled. When the power supply load is properly limited to 250 watts average, and the ambient operating temperature of the resource unit is maintained between 0°C and 40°C, the power supply will provide long trouble-free service.
Load Considerations
The LCS Resource Subsystem can provide the following power levels for each of the four available voltage sources in the system.
Table 2-1
250 Watt Power Supply Readings
+5 vdc @ 40A = 200 watts maximum
+12 vdc @ 8A = 96 watts maximum
-12 vdc @ 5A = 60 watts maximum
-5 vdc @ 5A = 25 watts maximum
Total power available = 250 watts maximum
The user must ensure that no single voltage source power rating is exceeded and also that no more than 250 watts total power is drawn from all voltage sources combined.
A rule of thumb for the 12-slot style of Resource Subsystems (i.e. the Resource Three and the Resource Four) for +5vdc is:
(200W - 4W per floppy drive - 1.5W per hard drive) / 12
For a system with three floppies and one hard disk, this formula yields approximately 186.5/12, or 15.5W per additional card.
The 16-slot style of LCS Resource Subsystems includes the Resource One, Resource Two, Resource Seven, and Resource Eight drawers. A rule of thumb for the 16-slot Resource Subsystem is:
(200W - 4W per floppy drive - 1.5W per hard drive) / 16
For a system with one floppy and one hard disk, this formula yields approximately 194.5/16, or 12.15W per additional card.
A more accurate method is to use a "power" grid or spreadsheet. Fill in the blanks and sum all of the actual watts as illustrated in Table 2-2.
Table 2-2
Power Grid
Power Requirements (watts)
Card Type +5V +12V -12V -5V Total
1 BC 3030 13 .6 .6 - 14.2
2 QL 3001 11 .48 .36 - 11.84
3 Ethernet 5 .48 .4 .5 6.38
NIC
5 BC 4000 20 .6 .6 - 21.2
6 Token Ring 4 .12 - - 4.12
7 QL 2200 13 .48 .3 - 13.78
8 QL 1044 12 .96 .6 - 13.56
Total 78 3.72 2.86 .5 85.08
Data taken from individual data sheets.
This section contains a passive 12 or 16 slot ISA compatible backplane and a power distribution panel.
Power for the backplane is input through a nine position barrier strip, located on the right end of the backplane. Two positions provide voltage sensing for the host power supply, two positions provide +5vdc, two positions provide +5vdc ground. +12V, -12V, and -5V are each powered with a single line and a single ground referenced to +5vdc ground.
An auxiliary four position connector is used to provide +5vdc and +12vdc to the power distribution panel.
Power Distribution Panel
The power distribution panel provides power, battery, and speaker signals to components within the LCS Resource Subsystem.
Figure 2-3 Power Distribution Panel.
Power is supplied to the panel through the four position CML connector labeled "INPUT" and is distributed to the other CML connectors labeled 1 through 8, which then provide power to the disk drives.
The power is also distributed to a 12 volt fan via the two-pin "FAN" connector, and to the Power On light on the front panel of the Resource Subsystem via the two-pin "LAMP" connector.
The two-pin connector labeled "BATTERY" is connected to a 6 volt battery. The power from the battery is distributed to the four-pin connectors labeled 1 through 8, which can then provide battery backup for the CMOS on each BC Series processor. In addition, the BC Series processors attached to these four-pin connectors can share the speaker output, which is provided by an eight ohm permanent magnet type speaker attached to the four-pin connector labeled "SPEAKER".
In summary, the power distribution panel performs several functions:
It provides power connectors for up to 8 disk drives
It provides power to the subsystem fan
It provides illumination of the Power On indicator
Speaker outputs from up to 8 processor boards are consolidated into one output
6 volt battery power is provided for up to 8 processor boards
Installing Bus Controllers
Cubix provides a segmented passive ISA compatible backplane in all LCS Resource Subsystems.
The segments are labeled on the backplane of the Resource Subsystem as "Group 1", "Group 2", etc.
When installing a Cubix BC Series processor in a segment, Cubix recommends that the BC Series board be installed in the rightmost slot of the Group.
Installation Instructions
1. Turn off power to the subsystem.
2. Unplug the power cord.
3. Remove the cover from the unit.
4. If replacing an existing BC Series processor, remove the retaining screw from the BC "L" bracket and remove the BC board.
5. If adding a new BC Series processor, remove the screws securing the blank "L" bracket from the rear I/O panel in line with the vacant slot desired. Remove the "L" bracket.
6. Install one Cubix BC Series bus controller board into each segment, or group, as desired. Secure each board with the screw located in the blank filler panel.
The following drawing shows three BC Series boards installed in a Resource Three Subsystem.
Figure 2-4 Resource Three Subsystem.
7. Connect the cables to the board, using the documentation provided with the BC Series processor.
8. Connect a keyboard and monitor to each BC board and apply power to the subsystem.
9. Run the setup program on each BC Series processor. Refer to the setup documentation provided with the BC board.
10. Turn off the power to the subsystem.
11. Install any other peripheral boards.
Replacing the ISA Backplane
1. Remove power from the LCS Resource Subsystem.
2. Carefully disconnect all cables from all installed boards.
3. Remove all boards from the backplane.
4. Remove the nine power supply leads from the ISA backplane by loosening the nine securing screws.
5. Disconnect the cable to the power distribution panel.
6. Remove the ten screws securing the ISA backplane to the drawer.
7. Remove the backplane.
8. Replace the backplane and reassemble in reverse order.
For each LCS Resource Subsystem, front panel access is provided for the maximum number of 3.5" floppy drives available for the specific subsystem. On the front panel, these access ports are numbered to match the group numbers on the ISA backplane segments. The ports are numbered from top to bottom, then left to right. The backplane is numbered from left to right.
When adding a disk drive, install the drive in the same numbered position as the segment or group the drive will service.
Floppy Disk Drive Installation/Replacement
1. Shut power off to the LCS Resource Subsystem with the front panel switch.
2. Disconnect the A.C. power cord from the rear on the rear I/O panel.
3. Remove the six screws securing the top cover, and remove the cover.
4. Remove the four screws in the front handles.
5. Remove the handles and the front panel.
6. If installing a new drive, remove the two screws securing the desired filler panel. If replacing an existing drive, remove the screws securing the present drive.
7. If replacing a drive, disconnect the four position power connector and the 32 position ribbon cable from the drive.
8. Remove the drive or filler panel by pulling forward.
9. If replacing a drive, remove the four screws securing the drive mounting brackets to the drive.
10. Attach the drive mounting brackets to the left and right side of the new drive using the four screws provided. Keep the bracket mounting flanges pointing away from the drive.
11. Install the drive assembly into the correct drive slot.
12. Secure the drive with two screws to the front of the drive mounting bay.
13. Connect the four position CML power cable provided with the Resource Subsystem between the drive and the power distribution panel. The connectors on the power distribution panel are numbered 1 to 8. Attach the cable to the same numbered connector as the segment or group the drive will service.
14. Connect a standard AT floppy data cable to the floppy drive connector (32-pin ribbon). Connect the other end to the desired processor floppy data connector.
15. Follow instructions in reverse order to reassemble.
Any of three styles of optional auxiliary junction panel may be installed in the 16-slot LCS Resource Subsystems. The Auxiliary Junction Panel is installed in the back panel of the subsystem above the ISA I/O panel. The auxiliary junction panel allows the user to customize solutions to a wide range of I/O requirements.
Since the amount of space for I/O connectors on the edge of each processor board is limited, board manufacturers must determine which I/O functions supported by the board will be accessible via an on-board connector and which functions will require an off-board connector. The auxiliary junction panel provides a location to install these off-board connectors.
The Cubix processor boards provide several I/O functions with internal headers. To access the I/O, these headers must be connected to an I/O adapter printed circuit board (PCB) designed for this purpose. This adapter board contains the standard connector to interface the internal header with the auxiliary I/O, and should be installed in an auxiliary junction panel on the LCS Resource Subsystem.
Each style of auxiliary junction panel is illustrated on the following pages.
Figure 2-5 DB-25 Auxiliary Junction Panel.
The panel illustrated in Figure 2-5 provides space to install up to sixteen DB-25 connectors. Typically this panel is used with Cubix QL Series processors to provide parallel printer support.
Figure 2-6 DB-9 and Mini-DIN Auxiliary.
Junction Panel
The panel illustrated in Figure 2-6 provides space to install up to sixteen DB-9 and sixteen Mini-DIN connectors. Typically this panel is used with Cubix QL Series processors to provide video and keyboard support.
Figure 2-7 DB-25, DB-9, and Mini-DIN.
Auxiliary Junction Panel
The panel illustrated in Figure 2-7 provides space to install up to eight DB-25, eight DB-9, and eight Mini-DIN connectors. Typically this panel is used with Cubix BC Series processors to provide parallel printer, COM2, and mouse support.
To install an auxiliary junction panel:
1. Remove power from the LCS Resource Subsystem.
2. Remove the nine screws securing the blank panel at the top of the rear I/O panel.
3. Using the same screws, attach the auxiliary I/O panel to the rear I/O panel.
4. Using the screws on the connector housing on the Cubix I/O adapter board, attach the adapter board to the auxiliary junction panel directly above the processor card it will service.
5. Attach the I/O adapter board to the internal header on the Cubix processor board. Refer to the documentation provided with the processor board for installation instructions.
The LCS Resource Subsystem adheres to the specifications for standard 19" wide RETMA mounting positions. It can be installed in a Cubix LCS Cabinet or in any enclosure adhering to the 19" RETMA specification.
LCS Cabinet Installation
1. Determine the proper location in the LCS cabinet for the subsystem, depending on the system configuration.
2. Install the two cabinet mounting rails in the LCS cabinet. Use the screws provided.
3. Pull the slider bars out of the cabinet rails until they lock into place (Figure 25).
4. Carefully align the subsystem rails with the slider bars and slide the subsystem in until it locks into place. Do not let the entire weight of the subsystem rest on the slider assembly until it is in place.
5. To slide the subassembly into the LCS cabinet, press the locking buttons on each side of the slider assembly.
6. Repeat this procedure for each additional subsystem.
Figure 2-8 LCS Subsystem Installation.
12-Slot LCS Resource Subsystem
The 12-slot style Resource Subsystems includes the Resource 3 and the Resource 4 drawers.
The fan is located on the sheet metal panel between the power supply and the portion of the chassis with the 12-slot master interface board.
1. Remove the fan cable by unplugging it from the connector board.
2. Remove the fan by removing the four screws.
3. Install the replacement fan.
16-Slot LCS Resource Subsystem
The 16-slot style of LCS Resource Subsystems includes the Resource One, Resource Two, Resource Seven, and Resource Eight drawers.
There are two fans in a LCS Resource Subsystem, the top fan located on the swingout metal bracket and the power supply fan located on the rear of the subsystem.
To remove the fan mounted on the top swingout panel:
1. Loosen the fan cable by clipping the tie wraps.
2. Remove the fan cable from its connector. It will probably be necessary to remove the five screws on the power distribution panel in order to gain access to the fan connector.
3. Remove the fan from the top panel by removing the four bolts and nuts.
4. Install the replacement fan.
To remove the fan mounted on the rear of the subsystem:
1. Remove the power supply cover by removing the three screws on the top.
2. Remove the fan cable from its connector J3 located in the 16-slot master interface board.
3. Remove the fan from the rear of the subsystem by removing the four screws and nuts.
4. Install the replacement fan.
This document, and all Web contents, Copyright © 1997
by Cubix Corp., Carson City, NV, USA.
