STC3500 Datasheet, PDF (15/48 Pages) Connor-Winfield Corporation – INTEGRATED - STRATUM 3 TIMING SOURCE

Detailed Description continued
The automatic reference selection is shown in the following state diagram:
Automatic Reference Selection
Figure 7
Ref_Rev_Delay
time expired
Stay
Locked on Ref m
time for t=
Ref_Rev_Delay
Ref n returns,
Ref m marked
revertive
Ref n returns,
Ref m marked
non-revertive
Locked
on Ref n
Loss of Ref n
Select &
Lock on
Select new reference:
Ref m
Next highest priority,
Qualified (within max. pull-in range, signal present > 10 sec.),
Non-masked
The operational mode is according to the following state diagram:
Automatic Operational Mode Selection
Figure 8
Reference Available
(Select highest priority)
Higher priority Ref return with
prior reference marked
revertive
Locked
Ref Loss w/alternate
reference available
Ref loss w/no good hold-
over history and no other
available reference
Ref Loss w/good holdover history
and no alternate reference available
No available
reference and
no holdover
history
Freerun
Ref
Return
Ref
Return
Holdover
Preliminary Data Sheet: TM060 Page 15 of 48 Rev: P06 Date: 11/22/04
© Copyright 2001 The Connor-Winfield Corp. All Rights Reserved Specifications subject to change without notice