344 TimeProvider 5000 User’s Guide
098-00028-000 Revision F – May, 2012
Chapter 4 Provisioning
Provisioning Expansion Shelf PTP/SyncE Outputs
Provisioning SyncE Outputs for the Expansion Shelf
Synchronous Ethernet (syncE) provides a method of distributing timing using the
physical layer of Ethernet devices. All intermediate nodes must have hardware and
software support for syncE. SyncE is used to distribute frequency through the
network. Synchronization Status Messaging (SSM) is passed between nodes in
ESMC messages. This allows nodes to determine the quality level of the upstream
node, to prevent timing loops, and also to reconfigure the timing path. The TP5000
provides the master function of providing synchronization via syncE .
Ethernet can be run in either asynchronous or synchronous modes. Electrical SFP
do not support the transmission of timing and therefore are asynchronous. Optical
SFP support synchronous operation and therefore can be used with syncE.
Normally, syncE nodes use the ESMC messages. However, if the downstream
devices do not use the ESMC messages, then the messages can be disabled.
The system PQL value is normally sent in the QL -value (SSM) field in the ESMC
message. If desired, this can be disabled and a value of DNU will be inserted in the
ESMC message.
The user should set the appropriate SSM option with the
command.
This can be configured to either option 1 or option 2.
shows the command hierarchy for provisioning SyncE.
Two output QL modes are supported to accommodate network switch variations:
Unidirectional:
SyncE output port supports a reduced SyncE, i.e. it transmits
ESMC messages and ignores ESMC messages from the downstream SyncE
NE. This is the default mode.
Bidirectional
: SyncE output port checks the SSM of the received ESMC
messages from the downstream NE. When the received SSM has the same QL
value as the TP 5000 internal QL, SyncE output port will set the outgoing SSM to
DNU. This mode accommodates SyncE switches that do not allow transmit and
receive sides of a traffic port to have the same SSM value.
Summary of Contents for TimeProvider 5000
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