Table 6 10.  FOM/TFOM Numerical Values and Estimated Errors

Estimated Position Error

Estimated Time

FOM/TFOM

(EPE, metres)

Error (ETE, UTC)

0

Not Used

(Note 1)

1

EPE < 25

ETE   1 ns

2

25 < EPE   50

1 ns < ETE   10 ns

3

50 < EPE   75

10 ns < ETE   100 ns

4

75 < EPE   100

100 ns < ETE   1  s

5

100 < EPE   200

1  s < ETE   10  s

6

200 < EPE   500

10  s < ETE   100  s

7

500 < EPE   1000

100  s < ETE   1 ms

8

1000 < EPE   5000

1 ms < ETE   10 ms

9

EPE > 5000

10 ms < ETE, or Fault

10 to 14

Not Used

Not Used

15

Not Used

ETE Not Available

Note 1:

External time source indicates proper/normal operation by TFOM = 0.

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