Furuno GF-8801, Hardware Specifications, Page: 10 / 31

GF-8801, GF-8802, GF-8803
Hardware Specifications
SE19-410-006-00
6
4.1 1PPS
Table 4.1-1. 1PPS general specifications
Item Specification
Note
Nominal frequency 1 Hz
Duty cycle 50 % [*1]
Synchronization target GPS, UTC [*2]
[*1] The pulse width can be changed by PPS command. Please refer to the eSIP protocol specifications for details.
[*2] 1PPS is output in synchronization with GPS time or UTC time. Please refer to the eSIP protocol specifications for details.
Table 4.1-2. 1PPS output specifications [FINE LOCK]
Item Specification Note
1PPS accuracy
(MAX|TE|)
< 40 nsec
MIN-MAX value from UTC time /
[*1][*2]
1PPS stability
(Standard deviation)
< 4.5 nsec @ 1sigma / [*2][*3]
1PPS stability
(Time deviation)
G.8272 PRTC-B
compliant
@ 1sigma / [*2][*4][*6]
1PPS stability
(MTIE)
G.8272 PRTC-B
compliant
Relative MIN-MAX value / [*2][*5][*6]
[*1] It is necessary to adjust cable offset beforehand. In addition, it may be necessary to adjust the hardware offset of the entire
device incorporating this product.
[*2] After SS mode or CSS mode for more than 24 hours, or after TO mode via it
[*3] GF-8701 uses a TCXO as an internal oscillator. Please pay attention to the installation environment since it is particularly
susceptible to wind and temperature.
[*4] TDEV of G.8272 PRTC-B compliant means that it meets the following specifications.
Time deviation limit [nsec]
Observation interval τ [sec]
1
1<τ<100
0.01τ
100
<τ<500
5
500<τ<100000
[*5] MTIE of G.8272 PRTC-B compliant means that it meets the following specifications.
MTIE limit [nsec]
Observation interval τ [sec]
0.275τ + 25 1<τ<55
40
55<τ
[*6]
G.8272 PRTC-B compliant
is GF-8802 and GF-8803 only. TDEV and MTIE of GF-8801 is G.8272 PRTC-A compliant.