Ptp Over Ethernet On Acx Series Routers Overview - Juniper ACX1000 Configuration Manual

ACX Series Universal Access Router Configuration Guide
Related
Documentation

PTP over Ethernet on ACX Series Routers Overview

238
NOTE: The term master is sometimes used to refer to the clock source.
Clock client—A clock client is the remote PTP host, which receives time from the PTP
master. The clock client is included in the configuration of the master clock.
NOTE: The term slave is sometimes used to refer to the clock client.
PTP over UDP over IPv4—The IEEE1588v2 standard specifies different transport
protocols for carrying PTP packets. For example, PTP over Ethernet, PTP over UDP
over IPv4, and PTP over UDP over IPv6. ACX Series routers support PTP over UDP over
IPv4.
Unicast mode (IPv4 on Gigabit Ethernet interfaces only)—Unicast mode is a user-to-user
protocol used to send a datagram to a single recipient. Unicast mode is used for
transporting PTP messages.
Precision Time Protocol Overview
IEEE 1588v2 PTP Boundary Clock Overview on page 234
Configuring Precision Time Protocol Clocking on page 243
Supported IPv4, TCP, and UDP Standards
Precision Time Protocol (PTP) is supported over IEEE 802.3 or Ethernet links on ACX
Series routers. This functionality is supported in compliance with the IEEE 1588-2008
specification. PTP over Ethernet enables effective implementation of packet-based
technology that enables the operator to deliver synchronization services on packet-
based mobile backhaul networks that are configured in Ethernet rings. Deployment of
PTP at every hop in an Ethernet ring by using the Ethernet encapsulation method enables
robust, redundant, and high-performance topologies to be created that enables a highly
precise time and phase synchronization to be obtained.
The ACX Series routers can be directly connected to different types of base stations (for
example, base transceiver station (BTS) in 2G, NodeB in 3G, and eNodeB in 4G networks)
and different types of routers that hand off time- division multiplexing (TDM), ATM, and
Ethernet traffic to the base station controller. ACX Series routers must extract the network
clock from these sources and pass on synchronization information to the base stations
to help the routers synchronize with the base station controller.
Most of the network deployments that use Ethernet contain a minimum of two Ethernet
rings, while some of the network topologies might also contain up to three Ethernet rings.
Consider a scenario in which the first ring contains aggregation routers (MX Series routers)
and the second ring contains access routers (ACX Series routers). In such a network,
Copyright © 2017, Juniper Networks, Inc.