TN 989d_Tait_MTBF_figures TB8100 Tech Notes/Tech Notes/TN 989d Tait MTBF Figures
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Tait Confidential Tait Electronics Ltd TECHNICAL NOTE TN#989d MTBF Figures for Tait Products 17 October 2006 Applicability 1. This Technical Notes applies to the following product types that have had MTBF figures calculated for them: - T700, T2000, TM8000 and TM9100 Mobiles - T3000, Tait Orca ‘E’ Series, Tait Orca 5000 and TP9100 Handportables - T800, TB7100, TB8000 and TB9100 Infrastructure Modules - TaitNet Network Equipment Introduction What is MTBF? Literally means “Mean Time Between Failure”. Defined as the average time (usually expressed in hours) that a component works without failure. It is calculated by dividing the total number of failures into the total number of operating hours observed. The term can also mean the length of time a user may reasonably expect a device or system to work before an incapacitating fault occurs. The Calculation Method. The MTBF figures for the offered radio equipment, both fixed and mobile are calculated according to the British Telecom “Handbook of Reliability Data for Components used in Telecommunications Systems” Iss.4 (HRD4). The temperature weighting factor, πt, is used as specified in the above reference. The quality factor, πq, is derived assuming a Quality Level 1, i.e. components manufactured and tested in accordance with generally accepted commercial practices; with no tests, inspection or screening beyond the component manufacturers normal quality control practices. The application environment factor, πe, is assumed to be either ground benign (πe=1), ground fixed (πe = 1.5) or mobile (πe=4 or 8) depending on the intended use of the equipment. Central control equipment is often situated in an environmentally friendly equipment room, which may often be air conditioned and an application environment factor of 1 is appropriate. Radio equipment may be installed on sites with various environmental conditions, a factor of either 1 or 1.5 may be appropriate. Please note that all MTBF figures are intended as a guide only and that the actual performance of the equipment experienced in practice will differ from this due to a number of factors that are not accounted for in the prediction method. The prediction method does not include any factor to account for the duty cycle under which the equipment is operated. The figures given assume the transmitters are operated at their maximum rated RF output power at their maximum duty cycle. The prediction method also does not take into account the “soak testing” that takes place on completed systems before delivery. Telephone:+6433579991 support@taitworld.com http://support.taitworld.com TN989d_Tait_MTBF_figures.doc Date of Print: 17/10/06 Page 1 of 7 Tait Confidential Tait Electronics Ltd This document is the culmination of all MTBF figures that have been used in tender responses by the CSO’s and Tait Sales Teams over the last several years. NOTE 2. Tait Mobile Radio MTBF No known figures currently exist for these products T500 and T700 T2000 TYPE T2010nnnnnn T2015nnnnnn T2020nnnnnn T2030nnnnnn T2035nnnnnn T2040nnnnnn Total Failure Rate (FITS) Failure in 109 Hours 16,500 hrs 16,500 hrs 16,500 hrs 16,500 hrs MTBF (Hrs) in Ground Benign Controlled Environment Πe = 1 (Application Environment) 40,000 hrs (TIe = 1.5) 40,000 hrs (TIe = 1.5) 40,000 hrs (TIe = 1.5) 40,000 hrs (TIe = 1.5) MTBF (Hrs) Ground Fixed Uncontrolled Environment Πe = 8 (Application Environment) 7,500 hrs 7,500 hrs 7,500 hrs 7,500 hrs 20,300 hrs 32,500 hrs (TIe = 1.5) 6,100 hrs TM8000 Series TYPE Total Failure Rate (FITS) Failure in 109 Hours TM8105 TM8110 TM8115 TM8252 TM8255 11565 hrs 14348 hrs 14348 hrs 11481 hrs 21718 hrs MTBF (Hrs) in Ground Stationary, Weather protected & Temperature Controlled. Πe = 1 (Application Environment) 86,465 hrs 69,696 hrs 69,696 hrs 87,101 hrs 46,044 hrs MTBF (Hrs) Ground Mobile, protected installations Πe = 4 (Application Environment) MTBF (Hrs) Ground Mobile (perHRD4) Πe = 8 (Application Environment) 21,616 hrs 17,424 hrs 17,424 hrs 21,775 hrs 11,511 hrs 10,808 hrs 8,712 hrs 8,712 hrs 10,888 hrs 5,755 hrs TM8200 NOTE: Note that the control head contributes significantly to the reduced MTBF figure due to its relative complexity, and in particular that of the LCD. Using this data, the LCD contributes to around half of the expected total head failures. Please note that failure of an LCD pixel does not constitute a failure of the product to operate as a twoway radio. TEL therefore urge extreme caution in releasing these numbers. TM9000 Series APCO Mobile TYPE Total Failure Rate (FITS) Failure in 109 Hours TM9155 21718 hrs MTBF (Hrs) in Ground Stationary, Weather protected & Temperature Controlled. Πe = 1 (Application Environment) 46,044 hrs MTBF (Hrs) Ground Mobile, protected installations Πe = 4 (Application Environment) MTBF (Hrs) Ground Mobile (perHRD4) Πe = 8 (Application Environment) 11,511 hrs 5,755 hrs Note: The heated LCD has not been accounted for in these calculations. Telephone:+6433579991 support@taitworld.com http://support.taitworld.com TN989d_Tait_MTBF_figures.doc Date of Print: 17/10/06 Page 2 of 7 Tait Confidential 3. Tait Electronics Ltd Tait Infrastructure Product MTBF TYPE Total Failure Rate (FITS) Failure in 109 Hours T825nnnnnn T826nnnnnn T827nnnnnn T828nnnnnn 9,450 9,750 9,400 3,300 105,800 102,500 106,300 303,000 T835nnnnnn T836nnnnnn T837nnnnnn T838nnnnnn T839nnnnnn 9,450 9,750 9,400 4,510 6,400 105,800 102,500 106,300 221,700 156,200 70,500 68,300 70,900 147,800 104,100 T855nnnnnn T856nnnnnn T857nnnnnn T858nnnnnn T859nnnnnn 9,450 9,750 9,400 3,900 5,510 105,800 102,500 106,300 256,400 181,400 70,500 68,300 70,900 171,000 120,900 T807100000 T800230011 4,600 217,000 145,000 T80100 T8011n 6,900 6,900 144,900 144,900 96,600 96,600 T80501 T80502 T80503 T80504 T80506 12,000 12,000 12,000 4,900 12,000 83,300 83,300 83,300 204,000 83,300 55,500 55,500 55,500 136,000 55,500 T803000000 5220 190,000 126,600 TA087020000 TA136020000 TA70301000n 5,221 5,050 8,500 191,500 198,000 117,000 127,000 132,000 78,000 Telephone:+6433579991 support@taitworld.com http://support.taitworld.com MTBF (Hrs) in Ground Benign Controlled Environment Πe = 1(Application Environment) MTBF (Hrs) Ground Fixed Uncontrolled Environment Πe = 1.5 (Application Environment) 70,500 68,300 70,900 202,000 TN989d_Tait_MTBF_figures.doc Date of Print: 17/10/06 Page 3 of 7 Tait Confidential Tait Electronics Ltd Third party products T800 MTBF (cont) TYPE Total Failure Rate (FITS) Failure in 109 Hours MTBF (Hrs) in Ground Benign Controlled Environment Πe = 1(Application Environment) DC/DC Converter PV12i (24/12V) DC/DC Converter PV24i (24/12V) HC100 162 Years (HRD4) 157,700 (manufacturers est) 78,900 (manufacturers est) HC250 OCXO (HCD660SC) TS4013 TS4014 TS5042 TS5043 Please Note: 1,000,000(Calc MIL 217C iss E 11,000 10,976 9,896 10,256 91,000 (Πe = 8) 91,000 (Πe = 8) 101,000 (TIe = 8) 97,500 (TIe = 8) - - TB8000 Series MTBF (Hrs) Ground Fixed Uncontrolled Environment Πe = 1.5 (Application Environment) 162 Years (HRD4) The above figures for T800 equipment were calculated for the VHF T830 series. They are also considered to be applicable to the VHF T820 and UHF T850 series as the component counts and component types are essentially the same The figures exclude the cooling fans. The fans used on the 100W power amplifiers are quoted by the supplier as having MTBF 70,000 hours at 40degC . The fan used in the T808 is also quoted by its supplier at the same figure. The following data has been calculated from units running in the field. The complete system (rack) has an MTBF of >= 50000 hours. Individual modules have the following MTBF: Reciter: 120,000 hours. PA: 225,000 hours. PMU: 135,000 hours. TB7100 Series Telephone:+6433579991 support@taitworld.com http://support.taitworld.com The TB7100 series of base station has been given an estimated MTBF value of >20,000 hours. Field failure data analysed to date has shown the performance is much greater than this. TN989d_Tait_MTBF_figures.doc Date of Print: 17/10/06 Page 4 of 7 Tait Confidential 4. Tait Electronics Ltd Tait Hand Portable Radio MTBF T3000 Series TYPE Total Failure Rate (FITS) Failure in 109 Hours T3010#XXXX#XXX 14,400 MTBF (Hrs) in Ground Benign Controlled Environment Πe = 1(Application Environment) MTBF (Hrs) Ground Fixed Uncontrolled Environment Πe = 8 (Application Environment) 8700 MTBF (Hrs) in Ground Benign Controlled Environment Πe = 1(Application Environment) MTBF (Hrs) Ground Fixed Uncontrolled Environment Πe = 2.5 (Application Environment) Tait Orca ‘E’ Series TYPE Total Failure Rate (FITS) Failure in 109 Hours TOP#H2110 95850 (PCB rev 1) 10433 Tait Orca 5000 Series TYPE Total Failure Rate (FITS) Failure in 109 Hours TOP#H2610#T0 (PCB rev 13) MTBF (Hrs) in Ground Benign Controlled Environment Πe = 1 MTBF (Hrs) Ground Fixed Uncontrolled Environment Πe = 2.5 57104 17512 TP9100 APCO Portables TYPE Total Failure Rate (FITS) Failure in 109 Hours TP9155 (4 key) TP9155 (4 key) Up to 15% LCD Pixel Failure1 TP9155 (4 key) Full LCD failure2 TP9160 (16 key) TP9160 (16 key) Up to 15% LCD Pixel Failure TP9160 (16 key) Full LCD failure 18639 MTBF (Hrs) Stationary use at weather protected and temperature controlled locations Πe = 1 53651 MTBF (Hrs) Portable and non# stationary use at temperature controlled locations Πe = 2 26825 MTBF (Hrs) Portable and non# stationary use at partly weather and non weather protected locations Πe = 2.5 21460 17482 57202 28601 22881 10925 91533 45767 36613 19839 50406 25203 20162 18682 53527 26764 21411 12125 82474 41237 23990 1 The HRD5 method counts each of the 5952 LCD pixels as potential failure candidates. A few pixel failures are not deemed critical to the radio operation so a "derated" figure is supplied to indicate the MTBF when up to 15% of pixel failures are allowed 2 LCD module excluded from calculations to illustrate its effect on MTBF Telephone:+6433579991 support@taitworld.com http://support.taitworld.com TN989d_Tait_MTBF_figures.doc Date of Print: 17/10/06 Page 5 of 7 Tait Confidential 5. Tait Electronics Ltd Tait Network Product MTBF Liberty Trunked System Components Model Number (where applicable) MTBF (Hrs) Channel Management Module (CMM) Site Management Module (SMM) Network Management Module (NMM) 2W PSTN Card T1541 Trunked System Components Please Note: Telephone:+6433579991 support@taitworld.com http://support.taitworld.com Model Number (where applicable) Greater than 25,000 Greater than 25,000 Greater than 25,000 Greater than 25,000 MTBF (Hrs) T1511-00 Channel Control Module (CCM) T1520-40 Site Control Unit (SCU) T1556-02 Modem inter site Greater than 25,000 T1541-00 Node Computer Greater than 25,000 T1561-15 Embedded Controller Card T1561-02 Audio I/O Greater than 25,000 T1561-03 PSTN 2 wire E&M DTMF Greater than 25,000 T1561-08 PSTN 4 wire E&M Greater than 25,000 Channel Management Module (CCM) Site Management Module (SSM) Greater than 25,000 Network (NMM) Greater than 25,000 Management Module Greater than 25,000 Greater than 25,000 Greater than 25,000 Greater than 25,000 These figures are based on actual field testing in various environments. Burnin procedures are carried out on each module at the production stage and again as part of the predelivery testing. TN989d_Tait_MTBF_figures.doc Date of Print: 17/10/06 Page 6 of 7 Tait Confidential Tait Electronics Ltd Compliance Issues MTBF figures are a subjective value sometimes required by RFP’s / Tenders. They do not tie into governmental compliances or regulations. CSO Instruction Please use this document to respond to all tender responses requiring MTBF information. If you find the information lacking in anyway, please contact the author. 6. Issuing Authority Name and Position of Issuing Officer Barry Crates Technical Support Team Leader Confidentiality Confidential – This message or document contains proprietary information intended only for the person(s) or organisation(s) to whom it is addressed. All Recipients are legally obliged to not disclose Tait technological or business information to any persons or organisations without the written permission of Tait. Distribution Level Tait Only Document History Original Release Added TM8200 Information Added TP9100 and TM9100 information Added TB7100 Updated TB8100 MTBF Telephone:+6433579991 support@taitworld.com http://support.taitworld.com 22 March 2005 2 April 2005 14 June 2005 28 July 2006 17 October 2006 BLC BLC BLC PH JN TN989d_Tait_MTBF_figures.doc Date of Print: 17/10/06 Page 7 of 7
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