- play_arrow Overview
- play_arrow Global Navigation Satellite System (GNSS)
- play_arrow GPS Systems on Routing Platforms
- play_arrow Integrated GNSS on Routing Platforms
- play_arrow GNSS Configuration for Routers Using External GNSS Receiver
- play_arrow Assisted Partial Timing Support (APTS) on Routing Platforms
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- play_arrow Network Time Protocol
- play_arrow NTP Concepts
- play_arrow NTP Configuration Examples
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- play_arrow Synchronous Ethernet
- play_arrow Synchronous Ethernet Overview
- play_arrow Synchronous Ethernet on 10-Gigabit Ethernet MIC
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- play_arrow Clock Synchronization
- play_arrow Clock Synchronization Concepts
- play_arrow Clock Synchronization for ACX Series Routers
- play_arrow Clock Synchronization for MX Series Routers
- play_arrow Clock Synchronization for PTX Series Routers
- play_arrow Centralized Clocking
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- play_arrow Hybrid Mode
- play_arrow Hybrid Mode Overview
- play_arrow Hybrid Mode and ESMC Quality-Level Mapping
- Configure Hybrid Mode and ESMC Quality-Level Mapping Overview
- Configure Hybrid Mode with Mapping of the PTP Clock Class to the ESMC Quality-Level
- Configure Hybrid Mode with a User-Defined Mapping of the PTP Clock Class to the ESMC Quality-Level
- Example: Configure Hybrid Mode and ESMC Quality-Level Mapping on ACX Series Router
- Example: Configure Hybrid Mode and ESMC Quality-Level Mapping on MX240 Router
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- play_arrow Configuration Statements and Operational Commands
- play_arrow Appendix
G.8275.1 Telecom Profile
G.8275.1 is a PTP profile for applications that require accurate phase and time
synchronization. It supports the architecture defined in ITU-T G.8275 to enable the
distribution of phase and time with full timing support and is based on the second version of
PTP defined in IEEE 1588. You can configure the G.8275.1 profile by including the profile-type
G.8275.1 statement at the [edit protocols ptp] hierarchy level.
If you don’t configure a profile, the device operates in IEEE1588v2 profile which is the default profile.
The following sections give a brief overview about the types of clocks supported in the G.8275.1 profile and about the alternate Best TimeTransmitter Clock Algorithm (BTCA):
Types of Clocks Supported in the G.8275.1 Profile
There are two types of clocks supported in this profile—ordinary clock and the boundary clock.
There are two types of ordinary clocks:
One that can be only a grandmaster clock (Telecom grandmaster or T-GM)
One that can be only a timeReceiver clock (a timeReceiver-only ordinary clock or T-TSC)
There are two types of boundary clocks:
One that can be only a grandmaster clock (T-GM)
One that can become a timeTransmitter clock and a timeReceiver clock to another PTP clock (T-BC)
MX Series routers support the T-TSC and T-BC clock types.
Alternate BTCA
The G.8275.1 profile uses an alternate Best TimeTransmitter Clock Algorithm (BTCA). The alternate BTCA allows:
A new per-port attribute named
notSlave. ThenotSlaveport attribute is implemented using theprotocols ptp masterstanza configuration.Multiple active grandmaster clocks. If there are multiple active grandmasters, every clock that is not a grandmaster is synchronized by a single grandmaster in the PTP domain.
Per-port attribute
local-priorityto be used as a tie-breaker in the dataset comparison algorithm.
