- 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
PTP Media Profile
The PTP media profiles comprise three profiles: SMPTE ST-2059-2, AES67, and AES67+SMPTE ST-2059-2. These profiles support video and audio applications for capture (for example, cameras) to be used in professional broadcast environments. These profiles supports PTP over IPv4 multicast and ordinary and boundary clocks.
Benefits of the PTP Media Profiles
The PTP media profiles enable multiple video and audio sources to stay in synchronization across multiple devices.
Functionality Common to the SMPTE ST-2059-2, AES67, and the AES67+SMPTE ST-2059-2 Profiles
These profiles include the following functionality:
These profiles do not use an alternate timeTransmitter clock, path trace, unicast message negotiation, alternate time scales, or acceptable timeTransmitter table.
Support for both ordinary clocks and boundary clocks as part of the IEEE 1588 PTP specification.
Support for encapsulating PTP over IPv4/UDP.
Multicast is required for both PTP over IPv4 and PTP over UDP.
Support for IEEE 1588 delay request and response method for the path delay measurement.
Support for the default IEEE 1588 BTCA algorithm.
Support for standard management packets.
Support for IGMPv2.
IGMPv3 is optional.
SMPTE Profile
The SMPTE profile is based on the SMPTE ST-2059-2 standard and was created specifically to synchronize video equipment in a professional broadcast environment. The standard allows multiple video sources to stay in synchronization across various equipment by providing time and frequency synchronization to all devices. This standard is used with other SMPTE standards such as SMPTE ST 2059-1, which defines a point in time (the SMPTE Epoch) used for aligning real-time signals, and formula for ongoing signal alignment. Alignment is considered met when two clocks are within 1 microsecond of each other. This implies that each timeReceiver should be accurate with +/- .5 microseconds of the central clock.
AES67 Profile
The AES67 profile is based on the AES67 standard and supports professional quality audio applications for high performance streaming over IPv4 multicast transport in media networks with low latencies. This profile enables audio streams to be combined at a receiver and maintain stream synchronization. The standard uses IPv4 multicast and IGMP, plus the DiffServ and DSCP fields, to select packet quality of service. Audio devices transmit their content using RTP (Real Time Protocol).
