Model 5601MSC
Model 5601MSC Master SPG/Master Clock System
Page - 154 Revision 2.2 MASTER CLOCK
4.5.14.8. PTP Priority 2
This menu item sets the priority 2 value for the BMC. Its range is 0 to 255.
4.5.14.9. Setting the PTP Domain
This menu item sets the domain of the PTP for master and slave
operations.
4.5.14.10. GMP Enable
This menu item controls the output of GMP Ethernet packets for a specific
output. These packets describe the exact time of the sync edge for a sync
output. They are output as a TLV extension in the IEEE-1588 announce
packet. They may be enabled for use with Evertz “Grand Master Proxy”
products to enhance the time accuracy.
Select GMP off to disable outputting GMP TLVs.
Select GMP on sync <1,6> to enable outputting GMP Ethernet packets for
sync <1,6> output if it is set to NTSC or PAL.
Select GMP on 10 MHz to enable outputting GMP Ethernet packets for 10
MHz output if it is set to NTSC or PAL.
Select GMP on WC to enable outputting GMP Ethernet packets for Word
Clock output if it is set to NTSC or PAL.
GMP on sync 1
GMP on sync 2
GMP on sync 3
GMP on sync 4
GMP on sync 5
GMP on sync 6
GMP on 10 MHz
4.5.14.11. PTP
PTP (also called IEEE-1588) is a multi master/multi slave time distribution method.
PTP uses UDP packets. The unique properties that give it its accuracy is the hardware’s ability to
timestamp the Ethernet packets, instead of the software. Additionally, network hardware may be aware
of PTP packets, and can modify them appropriately to improve timing accuracy. Note that there is
nothing to preclude using an entirely software-based approach and ordinary network switches; however
this will severely degrade the accuracy of the system. Lastly, there is a Best Master Clock (BMC)
algorithm that allows masters and slaves to all agree on who will be the grand master.
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