Symmetricom TimeProvider 5000 User Manual

304 TimeProvider 5000 User’s Guide 098-00028-000 Revision F – May, 2012
Chapter 4 Provisioning
Provisioning PTP
priority-1 Sets the advertised Priority 1 value for the Grandmaster for
the specified port. PTP clients use the Best Master Clock
(BMC) algorithm to determine which Grandmaster provides
the best signal by first comparing Priority 1 values, then
dynamic elements from the Grandmasters (such as clock
class, accuracy and variance), and then Priority 2 values.
priority-2 Sets the advertised Priority 2 value for the Grandmaster for
the specified port. Clients use the Best Master Clock (BMC)
algorithm to determine which Grandmaster provides the best
signal by first comparing Priority 1 values, then dynamic
elements from the Grandmasters (such as clock class,
accuracy and variance), and then Priority 2 values.
domain Sets the domain value for the Grandmaster clock.
IEEE-1588-2008 defines a domain as a logical grouping of
clocks that synchronize to each other using the protocol, but
that are not necessarily synchronized to clocks in another
domain.
dscp The Differentiated Services Code Point is an 6-bit field in the
8-bit Differentiated Services (DS) field of the IP packet
header to specify what classes of traffic will be provided,
what guarantees are needed for each class, and how much
data will be sent for each class. When used with the TP5000,
it provides a way to prioritize packets for PTP traffic.
dscp-state This is to enable or disable the use of DSCP.
dither This is an advanced feature in which an intentionally applied
form of noise is used to randomize quantization error, and
thus to break up any undesirable synchronizing effects with
the network. With dither enabled, the TP5000 varies the T1
timestamp by a pseudo-random sequence with peak
variations of no more than +/- 800 sec.
clockid This is the PTP master Clock ID for the specified PTP port.
The Clock ID for a PTP port on Symmetricom’s TP5000 is
typically based on the MAC value for that port, with FF:FE
inserted in the middle of the MAC address. This command
allows the user to manually set the Clock ID to a desired
value. The Clock ID is in the form xx:xx:xx:xx:xx:xx:xx:xx
Table 4-10. PTP  Common Parameter Descriptions (Continued)
Parameter Description

Symmetricom TimeProvider 5000 Specifications

General

Brand	Symmetricom
Model	TimeProvider 5000
Category	Server
Language	English