stc3800 Connor-Winfield VCXOs, stc3800 Datasheet - Page 15

• Manufacturer Part Number: stc3800
• Description: Integrated - Stratum 3e Timing Source
• Manufacturer: Connor-Winfield VCXOs

Detailed Description continued
The automatic reference selection is shown in the following state diagram:
The operational mode is according to the following state diagram:
Priority of Ref n > Ref m
No available
reference and
no holdover
history
Higher priority Ref return with
Ref loss w/no good hold-
over history and no other
available reference
prior reference marked
on Ref n
Locked
revertive
Freerun
Ref_Rev_Delay
time expired
© Copyright 2001 The Connor-Winfield Corp. All Rights Reserved
Automatic Operational Mode Selection
Preliminary Data Sheet #: TM061
Automatic Reference Selection
Select new reference:
Return
Ref
(Select highest priority)
Loss of Ref n
Reference Available
Locked on Ref m
Ref_Rev_Delay
Qualified (within max. pull-in range, signal present > 10 sec.),
Highest priority of
Non-masked
time for t=
Figure 7
Figure 8
Stay
Locked
Return
Ref
Ref m marked
Ref n returns,
Ref Loss w/good holdover history
“revertive”
Ref Loss w/alternate
reference available
and no alternate reference available
Page 15 of 48
Select &
Lock on
Ref m
Specifications subject to change without notice
Holdover
Rev: P06 Date: 11/22/04
Ref n returns,
Ref m marked
“non-revertive”