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MTBF (Mean Time Before Failure) Data

Reliability data for the

SBC 1000 and SBC 2000 is provided below. Reliability data such as MTBF are non-binding estimates of product performance and is based on use of the products in compliance with related product data sheets, including, without limitation, within the specified electrical, thermal and mechanical parameters. An MTBF measurement is based on a statistical sample and is not intended to predict any one specific unit’s reliability; thus MTBF is not, and should not be construed as, a warranty measurement. Please consult your

Predicted MTBF values were calculated according to Telcordia Technologies Special Report SR-332, Issue 1, May 2001 using Method II, (Black Box stress method integrated with laboratory data) including noted items below.

• Integrated circuits and ferrite inductors use vendor provided laboratory data.
• Purchased assemblies use reliability data provided by the OEM.
• Environmental factor = Ground Benign
• Quality Level 2 used for all components
• Maximum operating temperature = 40°C

• MTBF value for chassis fans relate to the failure rate of the fans during their useful life, which is 70,000 hours per fan.
  

Observed MTBF values are derived from actual field reliability measurements of SBC 1000 chassis, cards and other sub-assemblies as of November 2016. These values are subject to change as

Base Predicted and Observed MTBF Values for Constituent SBC Edge Products

The tables below list the MTBF values for constituent (i.e. minimally configured base systems and optional daughter cards) used in the SBC 1000 and SBC 2000. Fully assembled, customer orderable system-level SBC Edge product MTBF values can be determined from the equation documented in the next section.

Predicted and Observed MTBF Values for Customer-Orderable, System-Level SBC Edge Product

Method to Calculate Predicted and Observed MTBF Values

The following equation can be used to calculate the predicted and likely observed MTBF values for a given SBC 1000 or SBC 2000 complete, fully assembled system.

See Ribbon for a complete list of

systems

.

Predicted or Observed MTBF of complete SBC Edge System = 1/ ((1/MTBF of Base System) + (1/MTBF of first desired constituent accessory) + (1/MTBF of second desired constituent accessory) ...)

When using the equation,

Ribbon customers must use only observed or predicted constituent values from tables 1 or 2 to determine the system-level SBC Edge product. By way of example:

• When seeking the predicted MTBF of an SBC 1000 complete, fully assembled system, only use the appropriate values from the Predicted MTBF in Years column of Table 1
• When seeking the observed MTBF of an SBC 2000 complete, fully assembled system, only use the appropriate values from the Observed MTBF in Years column of Table 2
  

Examples of Calculated, Predicted, and Observed MTBF Values

The tables below shows examples of a

Ribbon customer using the aforementioned equation to calculate the predicted and observed MTBF for example fully assembled, system-level SBC Edge products.