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Glossary
NetBlazer
597
1588 PTP
Peer Delay
mechanism uses message Pdelay Request, Pdelay
Response, and if required Pdelay Response Follow Up. This
mechanism is restricted to topologies where each peer-to-peer port
communicates PTP messages with, at most, one other such port. Peer
Delay is not supported by the Telecom Profile.
In order to minimize traffic on the network, PTP can operate in different
modes:
Two-way
operation uses Sync/Follow Up, Delay Request, and Delay
Response messages.
One-way
operation uses only the Sync/Follow Up messages. This
mode of operation is used to synchronize a Client clock in frequency
only. The Master clock and Client clock phases are not aligned.
Two-step
clock mode uses the optional Follow Up message to carry
the T1 time stamp.
One-step
clock mode uses the Sync message to carry the T1 time
stamp; no Follow Up message is transmitted by the Master clock,
therefore less traffic on the network.
Client clock synchronization is achieved with a 2-part process:
Part 1: Path delay measurement using bidirectional messages
Mean path delay measurement (MPD) = ((T2-T1) + (T4-T3)) / 2
Part 2: Clock phase offset correction
Offset = (T2-T1) - MPD
The offset information is used by the Client clock to adjust the frequency of
its oscillator in order to keep the phase offset close to zero.
Содержание FTB-1
Страница 1: ...User Guide FTB 700G 800 Series NetBlazer for FTB 1 ETHERNET AND MULTISERVICE TESTER...
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Страница 59: ...Test Setup Test Applications NetBlazer 47 SONET SDH BERT For SDH BERT...
Страница 64: ...Test Setup Test Applications 52 FTB 700G 800 Series SONET SDH DSn PDH BERT For SDH...
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Страница 604: ...Glossary 592 FTB 700G 800 Series Acronym List W WAN Wide Area Network WIS WAN Interface Sublayer WWN World Wide Name...
Страница 606: ...Glossary 594 FTB 700G 800 Series 10G Ethernet Client The following figure presents a typical network application...
Страница 619: ...Glossary NetBlazer 607 Ethernet Cables Straight Through Cable 1000 Mbit s Crossover Cable 1000 Mbit s...
Страница 646: ...Glossary 634 FTB 700G 800 Series SONET DSn SDH PDH The GUI Grid indicates the TUG 2 x and TUG 3 x values...
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