Ptp (Ieee-1588 V2) - TRENDnet TI-PG1284i User Manual

TRENDnet User's Guide
if-range poe power-delay time VALUE
Web Configuration
Advanced Settings > PoE > Power Delay
Parameter Description
Port Selects a port or a range of ports which you want to configure.
State Enables/Disables the PoE Power Delay for the specific ports.
Time
The delay time for the specific ports.
Apply
Click Apply to take effect the settings.
Refresh
Click Refresh to begin configuring this screen afresh.
Power Delay Status
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This command configures the delay
time of the Power Delay for the range
of ports.
Port
The port ID.
State
The PoE power delay state for the port.
Time
The PoE power delay time for the port.
Notice: The high priority port should have low value for power delay.

PTP (IEEE-1588 v2)

PTP (Precision Time Protocol) is a distributed protocol to do time synchronization with
each other systems in the network.
There are 4 different clocks in PTP:
1. Ordinary Clock: Switch communicates with the network by using specified single
port. It will be same as grand master clock.
2. Boundary Clock: Switch can use multiple ports to communicate with network
and each port behaves as ordinary clock. Port is selected as either master or
member based on its local clock and data sets.
3. Transparent Clock: It forwards all received PTP messages and measures and
accumulate delay timers in correction field.
4. Forward Clock: It forward all received PTP messages in domain ports.
PTP works in 2 phases:
1. Establishing hierarchy: Only ordinary or boundary clocks will have this phase.
a. Processes all received announce messages by using "Best Master
Clock (BMC)" algorithm and identifies itself as either master or
member.
2. Clock Synchronization:
a. Master sends "Sync" message to member
b. Member sends "DReq (Delay Request)" message to master
c. Master sends "Dresp (Delay Response)" message to member
d. Member will adjust its clock by using parameters in above messages.
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