Juniper ACX2000 Configuration Guide

• 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
Configuring Hybrid Mode and ESMC Quality Level Mapping on ACX Series Routers
You can configure hybrid mode (that is, the combined operation of Synchronous Ethernet
and Precision Time Protocol (PTP)) on ACX Series routers. The combined operation is
possible only when the PTP client and the Synchronous Ethernet source are on the same
device and are traceable to the same master. When acting as a PTP slave, the router can
accept any external Synchronous Ethernet clock as reference. Note that when the selected
Synchronous Ethernet reference fails, the router continues to work in PTP mode.
In hybrid mode, the synchronous Ethernet equipment clock (EEC) on the MPC derives
the frequency from Synchronous Ethernet and the phase and time of day from PTP.
The hybrid mode is configured on the slave. On the slave, one or more interfaces are
configured as Synchronous Ethernet source interfaces.
The ESMC quality level value is mapped to the clock class value either by mapping the
PTP clock class to the ESMC quality level or by configuring a user-defined mapping of
PTP clock class to ESMC quality level. The following procedures explain configuring
hybrid mode with either of the modes in detail.
•
Configuring the Router in Hybrid Mode on page 292
•
Configuring Hybrid Mode with Mapping of the PTP Clock Class to the ESMC Quality
Level on page 293
•
Configuring Hybrid Mode with a User-Defined Mapping of the PTP Clock Class to the
ESMC Quality Level on page 293
Configuring the Router in Hybrid Mode
To configure the router in hybrid mode, you must:
1. Configure Synchronous Ethernet options at the [edit chassis synchronization] hierarchy
level:
•
Configure the auto-select mode of operation. You can select the clock source either
from a free-run local oscillator or from an external qualified clock.
When the router is configured with the auto-select option, the router chooses up to
two best upstream clock sources. It then uses the clock recovered from one of the
sources to lock the chassis clock. If an upstream clock with acceptable quality is
not available or if the router is configured in free-run mode, the router uses the
internal oscillator.
•
Configure the esmc-transmit and network-option options at the [edit chassis
synchronization hierarchy level.
•
Configure one or more interfaces at the [edit chassis synchronization] hierarchy level
as Synchronous Ethernet sources as needed.
Copyright © 2017, Juniper Networks, Inc.292
ACX Series Universal Access Router Configuration Guide

Juniper ACX2000 Specifications

General

Brand	Juniper
Model	ACX2000
Category	Network Router
Language	English