Assisted Partial Timing Support on ACX500 Routers Overview
The assisted partial timing support (APTS), which is a Global Navigation Satellite System
(GNSS) backed by Precision Time Protocol (PTP), delivers accurate timing and
synchronization in mobile backhaul networks.
NOTE: The APTS feature is supported only on the Junos OS Release
12.3X54–D25 for ACX500 router.
On the ACX500 router, the APTS feature helps you to configure PTP slave ports on a
GNSS grandmaster serving as the PTP master.
APTS uses GNSS as the primary time reference at cell site locations, or at an aggregation
point close to the cell sites. APTS uses network-based timing distribution to assist and
maintain the timing during holdover periods when GNSS is unavailable.
To support this feature, you need an APTS node with GNSS source configured at the
[edit chassis synchronization] hierarchy level and PTP boundary clock configured at the
[edit protocols ptp] hierarchy level as shown below:
GNSS configuration [edit chassis]
synchronization {
network-option <option-1 | option-2>;
port gnss {
client {
constellation <constellation-type>;
anti-jamming;
}
}
esmc-transmit {
interface <interfaces-name>;
}
}
PTPoE Configuration [edit protocols]
ptp {
clock-mode boundary;
slave {
interface <slave-ptp-ifl> {
multicast-mode {
transport ieee-802.3 [ link-local ] ;
}
}
}
master {
interface <master-ptp-ifl> {
multicast-mode {
transport ieee-802.3 [ link-local ] ;
}
}
}
Copyright © 2017, Juniper Networks, Inc.308
ACX Series Universal Access Router Configuration Guide
To Next Page
Loading...
Need help?
General
