Chapter 5:
Timing
77
v3.3-a 12/07/2022
5.4 IEEE 1588-2008 (PTPv2)
The IEEE 1588-2008 (PTPv2) module offers interoperability with a wide range of 3
rd
party devices.
It has been specifically designed to work as PTP master while supporting the following profiles:
•
Default
•
Telecoms profiles:
o
G.8265.1
o
G.8275.1+Sync-E
•
Power profile: IEEE C37.238-2011
Limitation on packet rate
It is not recommended to distribute PTP at full packets rate (128 pkt/s) on all its 16
network interfaces at the same time. In advanced configuration the user can modify
CPU priorities to avoid dropping packets on most critical ports. Unicast negotiation can
also be used to smartly decrease the packet rate depending on CPU load.
5.4.1 License
PTP License
A specific license must be purchased in order to get full access to the IEEE 1588-2008
(PTPv2) module. When no license is provided, the PTP instance will start with default
profile and parameters. The user will only be allowed to configure the Role of the port
(Master, Slave & Disabled).
The Table 5:4 compares the configuration of IEEE-1588 (PTP) when using or not a valid license. It
is worth highlighting that without license the PTP master instances will announce themselves
with default constant values instead of forwarding the VCS clock information from the active
timing source (§0)
PTP
With License
Without License
Mode
Auto, Master, Slave, Disabled
Master, Slave or Disabled
BMCA
Enabled or Disabled
Disabled
Transfer mode
Multicast or Unicast
Multicast
Unicast Negotiation
Enabled or Disabled
Disabled
Delay Mechanism
End to End (E2E) or Peer to Peer (P2P) End to end (E2E)
Network mode
IPv4 or Ethernet (layer 2)
IPv4
Domain
0-255
0
Announce ratio
[1 msg/16s,16 msg/s] ([-4,4])
1 msg/sec
Sync ratio
[1 msg/128s,128 msg/s] ([-7,7])
1 msg/sec
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