TN 989d_Tait_MTBF_figures TB8100 Tech Notes/Tech Notes/TN 989d Tait MTBF Figures

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Applicability

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

1. 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, π

ππ

πt, is used as specified in the above

reference.

The quality factor, π

ππ

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, π

ππ

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 deliver

y.

TECHNICAL NOTE TN#989d

MTBF Figures for Tait Products

17 October 2006

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NOTE

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.

2. Tait Mobile Radio MTBF

T500 and T700

No known figures currently exist for these products

T2000

TYPE Total Failure Rate

(FITS) Failure in

10

9

Hours

MTBF (Hrs) in Ground Benign

Controlled Environment Π

ΠΠ

Πe =

1 (Application Environment)

MTBF (Hrs) Ground Fixed

Uncontrolled Environment Π

ΠΠ

Πe

= 8 (Application Environment)

T2010nnnnnn 16,500 hrs 40,000 hrs (TIe = 1.5) 7,500 hrs

T2015nnnnnn 16,500 hrs 40,000 hrs (TIe = 1.5) 7,500 hrs

T2020nnnnnn 16,500 hrs 40,000 hrs (TIe = 1.5) 7,500 hrs

T2030nnnnnn 16,500 hrs 40,000 hrs (TIe = 1.5) 7,500 hrs

T2035nnnnnn

T2040nnnnnn 20,300 hrs 32,500 hrs (TIe = 1.5) 6,100 hrs

TM8000 Series

TYPE Total Failure Rate

(FITS) Failure in

10

9

Hours

MTBF (Hrs) in

Ground Stationary,

Weather protected

& Temperature

Controlled. Π

ΠΠ

Πe = 1

(Application

Environment)

MTBF (Hrs) Ground

Mobile, protected

installations Π

ΠΠ

Πe = 4

(Application

Environment)

MTBF (Hrs) Ground

Mobile (perHRD4)

Π

ΠΠ

Πe = 8

(Application

Environment)

TM8105 11565 hrs 86,465 hrs 21,616 hrs 10,808 hrs

TM8110 14348 hrs 69,696 hrs 17,424 hrs 8,712 hrs

TM8115 14348 hrs 69,696 hrs 17,424 hrs 8,712 hrs

TM8252 11481 hrs 87,101 hrs 21,775 hrs 10,888 hrs

TM8255 21718 hrs 46,044 hrs 11,511 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 twoway radio.

TEL therefore urge extreme caution in releasing these numbers.

TM9000 Series

APCO Mobile

TYPE Total Failure Rate

(FITS) Failure in

10

9

Hours

MTBF (Hrs) in

Ground Stationary,

Weather protected

& Temperature

Controlled. Π

ΠΠ

Πe = 1

(Application

Environment)

MTBF (Hrs) Ground

Mobile, protected

installations Π

ΠΠ

Πe = 4

(Application

Environment)

MTBF (Hrs) Ground

Mobile (perHRD4)

Π

ΠΠ

Πe = 8

(Application

Environment)

TM9155 21718 hrs 46,044 hrs 11,511 hrs 5,755 hrs

Note: The heated LCD has not been accounted for in these calculations.

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3. Tait Infrastructure Product MTBF

TYPE Total Failure Rate

(FITS) Failure in

10

9

Hours

MTBF (Hrs) in Ground Benign

Controlled Environment Π

ΠΠ

Πe =

1(Application Environment)

MTBF (Hrs) Ground

Fixed Uncontrolled

Environment Π

ΠΠ

Πe = 1.5

(Application

Environment)

T825nnnnnn 9,450 105,800 70,500

T826nnnnnn 9,750 102,500 68,300

T827nnnnnn 9,400 106,300 70,900

T828nnnnnn 3,300 303,000 202,000

T835nnnnnn 9,450 105,800 70,500

T836nnnnnn 9,750 102,500 68,300

T837nnnnnn 9,400 106,300 70,900

T838nnnnnn 4,510 221,700 147,800

T839nnnnnn 6,400 156,200 104,100

T855nnnnnn 9,450 105,800 70,500

T856nnnnnn 9,750 102,500 68,300

T857nnnnnn 9,400 106,300 70,900

T858nnnnnn 3,900 256,400 171,000

T859nnnnnn 5,510 181,400 120,900

T807100000 4,600 217,000 145,000

T800230011

T80100 6,900 144,900 96,600

T8011n 6,900 144,900 96,600

T80501 12,000 83,300 55,500

T80502 12,000 83,300 55,500

T80503 12,000 83,300 55,500

T80504 4,900 204,000 136,000

T80506 12,000 83,300 55,500

T803000000 5220 190,000 126,600

TA087020000 5,221 191,500 127,000

TA136020000 5,050 198,000 132,000

TA70301000n 8,500 117,000 78,000

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T800 MTBF (cont) Third party products

TYPE Total Failure Rate

(FITS) Failure in

10

9

Hours

MTBF (Hrs) in Ground Benign

Controlled Environment Π

ΠΠ

Πe =

1(Application Environment)

MTBF (Hrs) Ground

Fixed Uncontrolled

Environment Π

ΠΠ

Πe = 1.5

(Application

Environment)

DC/DC Converter

PV12i (24/12V)

162 Years (HRD4)

DC/DC Converter

PV24i (24/12V)

162 Years (HRD4)

HC100 157,700

(manufacturers est)

HC250 78,900

(manufacturers est)

OCXO

(HCD660SC) 1,000,000(Calc MIL 217C iss E

TS4013 11,000 91,000 (Πe = 8)

TS4014 10,976 91,000 (Πe = 8)

TS5042 9,896 101,000 (TIe = 8)

TS5043 10,256 97,500 (TIe = 8)

Please Note:

- 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.

TB8000 Series

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

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.

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4. Tait Hand Portable Radio MTBF

T3000 Series

TYPE Total Failure Rate

(FITS) Failure in

10

9

Hours

MTBF (Hrs) in Ground Benign

Controlled Environment Π

ΠΠ

Πe =

1(Application Environment)

MTBF (Hrs) Ground

Fixed Uncontrolled

Environment Π

ΠΠ

Πe = 8

(Application

Environment)

T3010#XXXX#XXX 14,400 8700

Tait Orca ‘E’ Series

TYPE Total Failure Rate

(FITS) Failure in

10

9

Hours

MTBF (Hrs) in Ground Benign

Controlled Environment Π

ΠΠ

Πe =

1(Application Environment)

MTBF (Hrs) Ground

Fixed Uncontrolled

Environment Π

ΠΠ

Πe = 2.5

(Application

Environment)

TOP#H2110

(PCB rev 1) 95850 10433

Tait Orca 5000

Series

TYPE Total Failure Rate

(FITS) Failure in

10

9

Hours

MTBF (Hrs) in Ground Benign

Controlled Environment Π

ΠΠ

Πe = 1

MTBF (Hrs) Ground

Fixed Uncontrolled

Environment Π

ΠΠ

Πe = 2.5

TOP#H2610#T0

(PCB rev 13) 57104 17512

TP9100 APCO

Portables

TYPE Total Failure Rate

(FITS) Failure in

10

9

Hours

MTBF (Hrs)

Stationary use at

weather protected

and temperature

controlled

locations

Π

ΠΠ

Πe = 1

MTBF (Hrs)

Portable and non#

stationary use at

temperature

controlled

locations

Π

ΠΠ

Πe = 2

MTBF (Hrs)

Portable and non#

stationary use at

partly weather and

non weather

protected locations

Π

ΠΠ

Πe = 2.5

TP9155 (4 key) 18639 53651 26825 21460

TP9155 (4 key)

Up to 15% LCD

Pixel Failure

1

17482 57202 28601 22881

TP9155 (4 key)

Full LCD failure

2

10925 91533 45767 36613

TP9160 (16 key) 19839 50406 25203 20162

TP9160 (16 key)

Up to 15% LCD

Pixel Failure

18682 53527 26764 21411

TP9160 (16 key)

Full LCD failure 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

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5. Tait Network Product MTBF

Liberty Trunked

System Components

Model Number

(where applicable) MTBF (Hrs)

Channel Management Module

(CMM)

Greater than 25,000

Site Management Module

(SMM)

Greater than 25,000

Network Management Module

(NMM)

Greater than 25,000

2W PSTN Card Greater than 25,000

T1541 Trunked

System Components

Model Number

(where applicable) MTBF (Hrs)

T1511-00 Channel Control Module

(CCM)

Greater than 25,000

T1520-40 Site Control Unit

(SCU)

Greater than 25,000

T1556-02 Modem inter site Greater than 25,000

T1541-00 Node Computer Greater than 25,000

T1561-15 Embedded Controller

Card

Greater than 25,000

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)

Greater than 25,000

Site Management Module (SSM) Greater than 25,000

Network Management Module

(NMM)

Greater than 25,000

Please Note:

These figures are based on actual field testing in various environments.

Burnin procedures are carried out on each module at the production stage

and again as part of the predelivery testing.

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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 22 March 2005 BLC

Added TM8200 Information 2 April 2005 BLC

Added TP9100 and TM9100

information

14 June 2005 BLC

Added TB7100 28 July 2006 PH

Updated TB8100 MTBF 17 October 2006 JN