System information

FCD 901 48
Issue R2A, 07.2009
XMP1 Release 5.5 System Description
Regionalization of clock synchronization
Page 2-26 Proprietary Information Aastra
2.3.6.9 Regionalization of clock synchronization
In order to enable a preferred clock connection of nodes to nearby clock
sources, a list of clock priority nos. can be defined for each node. In this
case, the node uses the clock priorities contained in the list for clock control,
irrespective of the highest clock priority identified by the node.
Central card slot info no. 9 of the Central Unit in the corresponding node
must be set to "Operation with preferred clock priorities".
In order to ensure a high flexibility, up to three stages can be configured.
These stages are defined in lists (list 1, 2 and 3), list 1 having the highest
priority.
By entering a list in a node, all lower-priority lists existing in this node will be
deleted. On entry of a "pseudo-list 0", all lists available in the node will be
deleted.
Example:
On entry of a list 1 in the node, all lists 2 and 3 already existing in the
corresponding node will be deleted. These lists must then be re-entered, if
required.
The nodes first use the clock priorities configured by means of list 1.
Only if a clock priority is not found in list 1, the clock priorities contained in
list 2 are taken into consideration.
If in the list configured last, a clock priority is not found, the normal clock
priority control function of the XMP1 network is used.
The clock priority list is entered via "Online Functions -> Debugging“ using
Debugging commands and sent out to the node.
Debugging commands can also be used to request these lists.
To change any settings in the node, the write function must be enabled
using the debugging command "#>enable <password> <timet>".
Fig. 2.11 shows a network with regional clock priorities and two stages (list
1 and list 2) configured.