Juniper ACX2000 Configuration Guide

are allowed in hybrid mode. Note that when the selected Synchronous Ethernet reference
fails, the router continues to work in PTP mode.
Unified in-service software upgrade (unified ISSU) is not supported when clock
synchronization is configured for hybrid mode.
NOTE: To switch between PTP and Synchronous Ethernet modes, you must
first deactivate the configuration for the current mode and then commit the
configuration. Wait for 30 seconds, configure the new mode and its related
parameters, and then commit the configuration.
Related
Documentation
Guidelines for Configuring Hybrid Mode on ACX Series Routers on page 290•
• Configuring Hybrid Mode and ESMC Quality Level Mapping on ACX Series Routers on
page 292
• Example: Configuring Hybrid Mode and ESMC Quality Level Mapping on page 295
Guidelines for Configuring Hybrid Mode on ACX Series Routers
Keep the following points in mind while configuring hybrid mode on ACX Series routers:
•
In a Hybrid Operation, the Frequency Module derives frequency from the Synchronous
Ethernet or BITS (T1/E1) clock or 10 MHz clock and Phase from the IEEE-1588v2
(PTPv2). The current deployments are all LTE-TDD based and require a phase accuracy
of only 1.5us and it is expected that this performance can be achieved without requiring
frequency assist.
•
Frequency Plane (Synchronous Ethernet, BITS (T1/E1), 10 MHz) is not impacted by the
phase or time plane. The frequency plane derives the frequency from Synchronous
Ethernet, BITS (T1/E1) and 10 MHz.
•
Phase/Time Plane uses the Frequency which is derived locally from the equipment
(Synchronous Ethernet, BITS (T1/E1), 10 MHz). To achieve phase accuracy of less than
1.5us, both Frequency Input source and PTP sources traceable to a primary reference
source (PRS) or primary reference clock (PRC). Hybrid mode is supported in a ring
topology.
•
You can configure the following frequency sources for hybrid node:
•
Synchronous Ethernet 1G, 10G with/without ESMC
•
BITS T1 Clock
•
BITS E1 Clock
•
10 MHz Clock
•
T1 Interface
•
E1 Interface
•
You can configure the following phase sources for hybrid node:
Copyright © 2017, Juniper Networks, Inc.290
ACX Series Universal Access Router Configuration Guide

Juniper ACX2000 Specifications

General

Brand	Juniper
Model	ACX2000
Category	Network Router
Language	English