| Server-Class PCI Express Backplane |
The OSS-EBP-2003 is a server-class
backplane. A server class backplane enables the maximum number
of high-bandwidth; i.e x4 or greater, PCI Express links from
the System Host Board to the backplane’s PCIE option
card slots. |
| SHB Slot |
Accepts an SHB Express (PICMG® 1.3) compliant
processor. The OSS-EBP-2003 is optimized to fully utilize
all available PCI Express links from server-class SHBs. |
| PCI Express Serial Slots |
Two PCI Express slots (slots PCIE1 and PCIE2)
on the BPX5 are x8 slots that mechanically support x8, x4
and x1 PCI Express cards. PCI Express option card slot PCIE2
is driven directly by the SHB via a x4 PCI Express link (B0)
between the SHB and the PCIE2 backplane slot. In order to
use the PCIE1 backplane slot a OSS I/O expansion board must
be used on the system host board. The I/O expansion board
provides the x4 PCI Express electrical connection to the
PCI Express Expansion slot (PCIES) that enables communication
between the SHB and the PCI Express option card in backplane
slot PCIE1. |
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PCIE3 and PCIE4 are x16 PCI Express mechanical
slots that are driven by two x8 PCI Express links (A0 and
A2) from the SHB. The slots mechanically support x16, x8,
x4 and x1 PCI Express option cards. |
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The actual speed of a PCI Express connection
to an option card slot is determined by the SHB’s PCI
Express link configuration and the auto-negotiation/link
training features of PCI Express. |
| Optional USB 2.0 Interfaces |
The SHB Express specification defines optional
I/O routings from the SHB to the backplane. The OSS-EBP-2003
takes advantage of this new specification feature by providing
two USB 2.0 headers capable of providing up to four USB 2.0
backplane ports. |
| Optional Ethernet Interfaces |
The OSS-EBP-2003 backplane supports the optional
Ethernet routing feature of the SHB Express (PICMG 1.3) specification.
Two 10/100/1000Base-T Ethernet RJ-45 connectors are available
for use on the backplane. Data communication performance
of the backplane’s Ethernet interfaces depends on the
Ethernet controller hardware and configuration on the system
host board. Consult your SHB Ethernet interface implementation
method for details. |
| Power Connectors |
The OSS-EBP-2003 backplane is available with
a low-profile, right angle power connector suitable for use
with either an ATX or EPS power supply. An optional version
is available with straight-in or vertical power connectors.
Using straight-in power connectors may interfere with a full-length
option card placed in the PCIE3 slot. |
| Power Indicators |
Surface-mount LEDs provide a convenient visual
check for +5V, -5V, +5V AUX,+12V, -12V and +3.3V power connection
and status. CAUTION: Never install or remove the SHB or any
option card from the BPX5 backplane if the +5V AUX LED is
GREEN. If the system appears to be off and the+5V AUX LED
is GREEN then you need to remove or turn-off the incoming
power to the system power supply. |
| Auxiliary Power Connector |
The +12V power connector is also a right angle
connector on the standard BPX5 and provides for routing auxiliary
power to the SHB’s edge connectors. This new capability
of PICMG 1.3 compliant SHBs and backplanes eliminates the
need for auxiliary power connections on the system host board.
Optional straight-in or vertical connectors are available. |
| Printed Circuit Layers |
The backplane is a six-layer, .062” thick
board with three separate signal layers: +5V/+12V, +3.3V
and ground. Multi-layer backplane construction provides excellent
noise immunity. |
| Connecting Power |
The combination of new power supply technologies,
soft-power control signals available via the Advanced Configuration
and Power Interface (ACPI) now supported by PICMG 1.3 SHBs
and auxiliary power connectors on PICMG 1.3 backplanes that
deliver all of the SHBs power to the edge connectors are
requiring a different approach to connecting system power. |
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Auxiliary power connectors on the backplane
are provided to help improve system Mean Time To Repair (MTTR).
All power can be delivered to the SHB via the board’s
edge connectors. One Stop Systems' PICMG 1.3 SHBs and backplane
SHB edge connector slots have ample power pins available
to meet the power demands of high-performance, dual processor
SHBs. The ATX/EPS and +12V power connectors on the BPX5 backplane
also have an ample number of power pins available to meet
these demands. The system designer needs to be aware of the
potential power demands of the entire system including the
particular SHB to ensure that both the power supply and the
power connectors in the cable harness can safely deliver
the necessary power to drive the entire system. |
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Specific implementations of ACPI signals,
ATX/EPS power supply type and the operating system software
will determine the specific connection method for the power
supply. For example the use of the Power Good (PWRGD), Power
Supply On (PSON#), Five Volt Standby (5VSB) and the Power
Button (PWRBT#) ACPI or soft power control signals require
the following connection method: |
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ACPI signal usage is optional and may be turned
off using the SHBs BIOS and/or signal jumpers. Specific power
connections and BIOS parameters will differ according to
unique system design requirements. |
