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Chapter 4 Operations
Introduction
7. Fail—RTE has a hardware error. 10 MHz and 1PPS outputs are not guaranteed.
When the error is cleared, RTE goes to Holdover mode.
RTE (Real Time Engine) Clock Modes
Power-up
Warm-up
Never-locked
Locked
Holdover
(4)
(3)
Recovery
Figure 4-1.
TimeProvider 100 Clock Modes
The RTE clock module puts out valid clock signals if it is in Locked, Holdover, or
Recovery mode. The RTE clock module puts out invalid clock signals when it is in
FAIL mode.
Table 4-1
describes the seven RTE clock mode conditions and Telecom outputs.
Table 4-1. RTE Clock Modes
RTE Mode
Power-up
RTE is booting up. 10 MHz and 1PPS
outputs are not valid.
Warm-up
RTE OCXO is warming up and has
not stabilized. 10 MHz and 1PPS
outputs are not valid.
Never-locked
RTE has not locked to GPS since
power-up. 10 MHz and 1PPS outputs
are available, but their quality is not
guaranteed.
44
TimeProvider 100 User's Guide
Fail
(5)
(1)
Notes:
(1) Lost satellites
(2) Found satellites
(3) Lost satellites
(2)
(4) Lock achieved
(5) HW error cleared
RTE Conditions
TimeProvider 100 Telecom Output
Clock quality = DUS (Do not Use for
Sync).
Clock quality = DUS (Do not Use for
Sync).
(1) Clock quality = ST3 (Stratum 3) if
TimeProvider 100 has no hardware
faults that affect the telecom outputs.
(2) Clock quality = DUS (Do not Use for
Sync) if TimeProvider 100 has
hardware faults that affect the telecom
outputs.
098-00106-000 Revision A – March, 2009
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