3Com WX3000 Series Operation Manual page 479

Server/client mode
Figure 1-2 Server/client mode
Client
Filters and selects a clock
and synchronizes the local
clock to that of the preferred
server
Symmetric peer mode
Figure 1-3 Symmetric peer mode
Active peer
In peer mode , both sides
can be synchronized to
each other
In the symmetric peer mode, the local device serves as the symmetric-active peer and sends clock
synchronization request first, while the remote server serves as the symmetric-passive peer
automatically.
If both of the peers have reference clocks, the one with a smaller stratum number is adopted.
Broadcast mode
Figure 1-4 Broadcast mode
Server
Works in the server mode
automatically and sends
responses
Network
Clock synchronization
request
Response
Passive peer
Network
Clock synchronization
request
Response
Synchronize
Network
Broadcast clock synchronization
packets periodically
Client/server mode
request
Response
Broadcast clock synchronization
packets periodically
Server
Works in server mode
automatically and sends
a response packet
Works in passive peer
mode automatically
Client
Initiates a client/server mode
request after receiving the
first multicast packet
Obtains the delay between the
client and server and works in
the multicast client mode
Receives multicast packets and
synchronizes the local clock
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