Provision Synchronization - Alcatel-Lucent 9500 MPR User Manual

4.7.3.6 Synchronization Protection
Refer to paragraph 4.7.4.
4.7.4

Provision Synchronization

All 9500 MPR radios in the network must be synchronized to the same clock. One radio in
the network is provisioned Master. All other radios in the network must be provisioned
Slave. The slave radios all sync to the clock provided by the master.
4.7.4.1 Normal Operation
During normal operation, the master can be provisioned to get sync clock from two sepa-
rate sources: an internal local oscillator (most common source) or external clock from cus-
tomer provided equipment. The slave radios can be provisioned to receive the sync clock
from one of two sources: clock recovered by the radio receiver or the sync clock from
another radio in the network. Normally at a repeater, the sync clock is received over the
RF path and recovered by the radio receiver. A typical slave terminal uses the clock from
an adjacent radio. See
27 for typical slave terminal provisioning.
4.7.4.2 Failed Primary Operation
With the exception of the master when the radio is provisioned to sync off the local oscilla-
tor, the provisioned secondary sync source is enabled if the primary source fails. When the
master, provisioned to accept sync clock at the core from an external source, fails, the inter-
nal free-running local oscillator is enabled. Provisioning choices for the secondary source
for slave radios are dependent upon the choices made from the primary source.
4.7.4.3 Sync Switching
With the exception of the master when the radio is provisioned to sync off the local oscilla-
tor, the sync clock source is switched from primary to secondary if the primary source fails.
Sync clock switching provisioning is dependent on the role of the radio in the network
(master or slave) and on user preference. A revertive switching feature is a provisioning
option that restores the sync clock to the original source when the alarm on the primary
source is cleared. If revertive switching is not selected, the secondary sync source will con-
tinue to provide sync clock, and if the secondary source fails, must be manually switched to
the primary source.
Figure 4 - 26 for typical master terminal provisioning. See Figure 4 -
4-63