File
5
CLOCK SYNCHRONIZATIONCALL SERVER : PRIVATE NETWORKS
Ed. 04 3/4Réf. 3EH 21000 BSAA
Principles which must be respected:
- to avoid 2 nodes from the same level synchronizing each other, assign priority 255 to the links
between the 2 nodes on the system (synchronizing) side and a smaller priority value on the slave
(synchronized) side.
- a node can only be enslaved on another node having an identical or lower hierarchic level.
- for any given node, assign a single priority number to links of the same type (T2, T0, leased lines).
- for any given node, a T2 link must always be assigned a smaller priority number than a T0 link.
EXAMPLES
Node 1
(pilot)
Node 2 Node 3
Node 4
Permanent T0
Non permanent T0
T2
LEVEL
1
LEVEL
2
LEVEL
3
P = 0
P = 1
P = 19
P = 255
P = 255
P = 255
P = 255
P = 255
P = 10
P = 20
P = 10
P = 20
P = 21
Node 1
(pilot)
Node 2 Node 3
Node 4
P = 255
P = 10
Network with 4 nodes and 3
hierarchic levels
Addition of a link between nodes 1
and 4 (no modifications in the
existing configuration)
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