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DXD8/PTP User Manual (rev 2.15)

Page 19

12.2 DISTRIBUTED PTP VS. INDIVIDUAL GRANDMASTERS WITH GNSS

In this example, DXD-8’s are installed in several studios. In order to keep them in sync, 2 different options are available:

-

Distributed PTP

-

Individual Grandmasters with GNSS reference

The first illustration shows distributed PTP where all the DXD-8’s are PTP slaves to an external Grandmaster; in the second
illustration, the DXD-8’s are all Grandmaster for their networks and each is locked to GNSS. This second solution is
particularly useful when distances between studios are long and certainly for remote trucks.

PTP GRANDMASTER

STUDIO 1

STUDIO 2

STUDIO 3

STUDIO 4

STUDIO 5

PTP GRANDMASTER

PTP GRANDMASTER

PTP GRANDMASTER

PTP GRANDMASTER

Individual Grandmasters with GNSS Reference

PTP SLAVE

STUDIO 1

PTP SLAVE

STUDIO 2

PTP SLAVE

STUDIO 3

PTP SLAVE

STUDIO 4

PTP SLAVE

STUDIO 5

PTP

GRANDMASTER

Distributed PTP

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Содержание DXD-8

Страница 1: ...l Clock Operations manual Version 2 15 October 2021 All materials herein Brainstorm Electronics Inc Brainstorm Electronics reserves the right to change or modify the contents of this manual at any tim...

Страница 2: ...9 6 Time Menus 9 6 1 TIME STANDARDS MENU 7 1 9 6 2 TIME DATE DISPLAY MENU 7 3 9 7 Time Code Menus 9 7 1 SMPTE 2059 SETUP MENU 8 1 9 7 2 LTC GENERATOR 1 2 MENUs 8 2 8 3 10 8 Display 10 8 1 Main Rotati...

Страница 3: ...tion 20 13 1 SELECTING PTP V1 20 13 2 DIFFERENCES IN SETTINGS FOR PTP MENU 5 2 GRANDMASTER 20 13 3 DIFFERENCES IN SETTINGS FOR PTP MENUS PORT TIMING 20 14 AVB IEEE 802 1as gPTP Firmware Option 21 15 G...

Страница 4: ...PTP be sure to update your DXD 8 with the latest fi rmware available on the Brainstorm website When you purchased your DXD PTP you received a unique authorization key a series of 4 numbers separated...

Страница 5: ...lable this fields enables GPS to be set as the reference when the DXD 8 is the Grandmaster Enabling this field will announce the DXD 8 as GPS referenced giving it a higher priority at being selected b...

Страница 6: ...al networks would set all the parameters to the default values and allow for a quick set up Selecting Load pro fi le defaults will cause all the timing values to reset to the pro fi le default values...

Страница 7: ...e year month day hour and seconds even nanoseconds to achieve frequency and phase synchronization At the heart of the DXD 8 is the Main Time of Day Clock TOD Reference Frame Generator This is where S...

Страница 8: ...ck to PTP When that is achieved the DXD 8 will release the PTP Lock and revert to the BNC source selected in the reference menu Reasons to PTP time jam DXD 8 s include Locking to a common video refere...

Страница 9: ...Ethernet port from the external PTP Grandmaster 6 2 TIME DATE DISPLAY MENU 7 3 With the PTP option Ext PTP Grandmaster is added to the list available in menu 7 3 where 2 different DXD times dates can...

Страница 10: ...displayed in the reference line But if the DXD 8 is selected one of the other 3 options above will be displayed Internal Internal OCXO or GPS Receiver Lock Status The bottom line of the display has th...

Страница 11: ...on the main display while in the STATUS mode To activate the STATUS mode press the STATUS key The Status LED illuminates to con fi rm your selection This fi rmware update includes the following new S...

Страница 12: ...Response Peer Delay Request Peer Delay Response Those are running counters and can be cleared by pressing the ENTER key Monitoring the messages exchanged is useful when troubleshooting Announce and S...

Страница 13: ...e ability to clock to a non Dante PTP v2 clock AVB Audio Video Bridging is a set of IEEE standards that facilitate the transport of high performance audio and video on a LAN One of those standards IEE...

Страница 14: ...tter suited clock is found it will become the Grandmaster 9 6 SYNCHRONIZATION There are several different PTP messages used during synchronization sequenced as follows 1 The grandmaster sends a Sync m...

Страница 15: ...locks on a single PTP communication path must use the same method to measure the time delay 9 8 TYPES OF CLOCKS IEEE 1588 de fi nes three different types of clocks Ordinary Clock OC Boundary Clock BC...

Страница 16: ...port can change The BMCA determines what unit becomes the Grandmaster If the current Grandmaster disappears or looses GPS another Grandmaster is selected For more on the Grandmaster selection go to 9...

Страница 17: ...difference detected between the external PTP GM and the DXD System Time is above the PTP Jump Threshold value the DXD will jump to the new time and relock through the normal lock procedure This will...

Страница 18: ...all equipment could be kept perfectly synchronized But for added fl exibility the DXD s can also be set up to lock to any legacy sync or to PTP as illustrated below These choices are available in the...

Страница 19: ...slaves to an external Grandmaster in the second illustration the DXD 8 s are all Grandmaster for their networks and each is locked to GNSS This second solution is particularly useful when distances b...

Страница 20: ...bscure PTPv1 keeps track of whether or not a device is a Boundary Clock and PTPv2 PRIORITY 2 is mapped to that setting as follows PRIORITY 2 127 or less Boundary Clock TRUE PRIORITY 2 128 or more Boun...

Страница 21: ...when in PTPv1 mode You may continue to use the same setting as you would for PTPv2 14 AVB IEEE 802 1as gPTP Firmware Option The DXD 8 supports 2 versions of the IEEE 802 1AS standard the original vers...

Страница 22: ...NTS PTP Domain Devices that need to be synchronized together via PTP must be part of the same domain Be sure the PTP domain is set properly on your DXD as messages with any other domain number will be...

Страница 23: ...pports IGMPv2 On larger networks a router is required to manage multicast group membership Switches that support IGMP Snooping are also recommended 16 Troubleshooting Error Warning Messages 16 1 PTP N...

Страница 24: ...Menu 5 1 If PTP was selected TIME JAM BNC INPUT will automatically show in menu 5 1 in blue blue status information The words Time Jam will also appear on the REFERENCE line at the bottom of the main...

Страница 25: ...TION No Action DELAY MECHANISM E2E End to End ANNOUNCE INTERVAL 2 sec log 1 ANNOUNCE RECEIPT TIMEOUT 3 announce intervals SYNC INTERVAL 1 2 sec log 1 MINIMUM DELAY REQUEST INTERVAL 2 sync intervals PO...

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