Symmetricom 1000, 1100 manual Subtending Mode, Sequence QLevel on Active Reference, Non-Revertive

Chapter 1 Overview of the TimeProvider

Reference Input Signals

Table 1-2. SSU-Based Reference Selection Scenarios

Sequence	QLevel on	QLevel on	QLevel on	Active Reference
	PRS	INP1	INP2	Non-Revertive1	Revertive2
1	2	2	2	PRS	INP1
2	4	2	2	INP1	INP1
3	4	4	2	INP2	INP2
4	4	4	4	INP2	INP1
5	4	4	2	INP2	INP2
6	4	2	2	INP2	INP1
7	2	2	2	INP2	INP1
8	2	2	LOS	PRS	INP1
9	2	LOS	2	PRS	PRS
10	LOS	LOS	2	INP2	INP2
11	LOS	LOS	LOS	Holdover	Holdover
12	LOS	LOS	2	INP2	INP2
13	2	LOS	2	INP2	PRS
14	2	2	2	INP2	INP1

Note:

1Non-revertive example. Priority Levels set to: PRS = 3, INP1 = 3, and INP2 = 3

2Revertive example. Priority Levels set to: PRS = 2, INP1 = 1, and INP2 = 2

Subtending Mode

Table 1-3illustrates which input is the active system reference under several different input conditions when the TimeProvider is in the Subtending mode.

Table 1-3. Subtending-Based Reference Selection Scenarios

Sequence	QLevel on	QLevel on	Active Reference
	INP1	INP2	Non-Revertive1	Revertive2
1	1	1	INP1	INP1
2	2	1	INP2	INP2
3	2	2	INP2	INP1
4	2	1	INP2	INP2
5	1	1	INP2	INP1
6	1	LOS	INP1	INP1

097-58001-02 Revision G – April 2008 TimeProvider User’s Guide 37