RS255 Rugged 2U Server

Field tested, failsafe and long life performance in extreme conditions. As processing performance continues to improve, Crystal Group is dedicated to minimize the SWaP envelope of the RS255. High-end computing performance in a 2U chassis with a depth under 20” (50.8 cm) fits most any rack space.


RS255 Rugged 2U Server

• Light weight aluminum construction – 30-35 lbs.
• Easily mounted– Delrin glides, fixed mount, or Jonathan® rails
• Up to 512 GB of memory
• Rugged 2U, rack mounted 20” depth
• Five removable 3.5” HDD or ten removable 2.5” SSD bays
• Expandable with five low profile slots
• Intel® Broadwell Xeon® processors

Please contact us to receive the reports, guides and drawings that best fit your requirements.


Environmental Standards
MIL-STD-810, Operational Temperature, Method 501, Procedure I/II

-15°C to +55°C, -40°C to +71°C with select processors

MIL-STD-810, Storage, Method 501, Procedure I/II

-55°C to +85°C

MIL-STD-810, Humidity, Method 507, Procedure II

240 hours with humidity kit

MIL-STD-810, Altitude, Method 500

12,500ft operation, 40,000ft transport

MIL-STD-810, Vibration, Method 514, Procedure I

4.63 GRMS, 5-2,000Hz, 60 min/axis with solid state drives and vibration kits

MIL-STD-810, Shock, Method 516, Procedures I/V

20g, 11msec—functional shock; 40g, 11msec crash hazard shock

MIL-S-901, Grade B
MIL-S-901, Grade A

With solid state drives + shock kits

Electromagnetic Compatibility Standards
Some standards may require an internal kit
AC, FCC compliant
AC, MIL-STD-461, RE102, CE102 compliant
DC, MIL-STD-461, RE102, CE102 compliant
RTCA DO-160 Section 21, Category M
Form Factor
3.5" (8.89cm)
17.5" (44.45cm) (accepts Crystal Slides and Jonathan rails) EIA-310 Compliant
20" (50.8cm)
30 - 35 lbs ( 13.61 - 15.88 kgs ) (content dependent)
Intel® CPU architecture options from Intel embedded long-life roadmap
Intel® Broadwell Xeon® processors

Up to 18 core options per socket (dependent on motherboard)

Expansion Slots
Five low profile slots; combinations are configuration dependent
External Bays
Option 1

Five removable SATA or SAS 2.5” or 3.5” HDD

Option 2

Ten 2.5” SATA or SAS HDDs

Option 3 (can be combined with HDD option)


16 GB - 512 GB DDR4 (motherboard dependent)

Six high speed, high volume fans; CPU temperature controlled

Option 1

Mounted on Delrin glides

Option 2

Fixed mount, front and rear

Option 3

Jonathan rails

Power Supply
Option 1

600W 120/240VAC W/PFC, 115VAC 400Hz

Option 2

1200W 1+1 120/240VAC W/PFC, 115VAC 400Hz

Option 3

1005W 18-36VDC

System Board
Option 1

X10DRL-I, Dual LGA2011 R3 Xeon®, ATX, 2LAN1000, VGA, 5 PCI-E X8, 1 PCI-E X16, IPMI, IPKVM, SATA3X10

Option 2

X10SRL-F, Single LGA2011 R3 Xeon®, ATX, 2LAN1000, VGA, 2 PCI-E X16, 5 PCI-E X8, IPMI, IPKVM, SATA3X10

Option 3

3X PCI-E 3.0 X16, PCI-E 3.0 X4, 5V PCI, 6X USB 3.0, 4X USB 2.0, USB 3.1, IPMI, 6X SATA3

Software Compatibility
Accepts Windows 10®, VMware®, Linux® or Windows Server 2019®
Export Compliance
ECCN: 5A992 | Classification is dependent on configuration and is subject to change. Please contact your Program Manager to receive the classification of your product.


This product is deployed on the following programs:

  • THAAD (Terminal High Altitude Area Defense) for US Army
  • Radiant Mercury for US Army
  • MQ-8 Fire Scout for US Navy
  • Virtual Secure Enclave (VSE)
  • The Integrated Shipboard Network System (ISNS) for US Navy
  • SCI for US Navy
  • Joint Precision Approach and Landing System (JPALS) for civil and multi-service military