Users Manual

SME VOIP SYSTEM GUIDE 1.1 65 | P a g e
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NOTE: Must only be used for debug purpose and not enabled on a normal
running system
External LAN sync setup
The “External LAN sync setup” covers the configuration of an external synchronization. This means that, in order to
support more than 250 Base stations in a system, it is necessary to use multi-level synchronization.
In multi-level synchronization, a primary zone is defined which is used by the other secondary zones in the system as
synchronization source. Please see the figure below:
The primary and alternative sync source in each secondary zone, will be connected to the primary zone to ensure
redundancy. When using this configuration, each secondary zone will cause a load to the primary zone as two base
stations and this must be accounted for when configuring the primary zone. Therefore, it is recommended that the
number of base stations in the primary zone is kept as low as possible, but it must as minimum contain 3 base stations
to ensure redundancy.
To minimize synchronization jitter between each secondary zone, it is important that the network path between the
primary zone and its secondary zones is as equal as possible. Therefore, the primary zone must be connected to the
network switch which forms the top node in the switching tree. In a good network topology example, as the one
mentioned in the beginning of the subchapter, this will be the switch where the DHCP server is connected.
The table below displays the available settings for configuring a Multi-Level synchronization.
PARAMETERS DEFAULT
VALUES
DESCRIPTION
EXTERNAL SYNC Disabled To have external LAN synchronization, enable the feature by choosing one of
the options below:
Primary zone configuration
Seco
ndary zone configuration
MULTICAST IP
ADDRESS
224.0.1.129 In order to listen for IEEE1588 PTP packages, the IP address should be defined
The IP address must start with 224.0.xx.xx and this cannot be changed.