A domain is an interacting set of clocks that synchronize to one another using PTP. Clocks are assigned to a domain by virtue of the contents of the Subdomain name fields in PTP messages they receive or generate. Domains allow multiple clock distribution systems to share the same communications medium. In the N870 you can create Clusters : SETTINGS - Base stations - Synchronisation. These clusters are used for DECT and LAN synchronisation. The settings below shows dependent on the selected cluster, which PTP domain will be used. N870 Common PTP domain | PTP subdomainNumber |
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Cluster 1-c | 21 | Cluster 2-c | 21 | Cluster 3-c | 21 | Cluster 4-c | 21 | Cluster 5-c | 21 | Cluster 6-c | 21 | Cluster 7-c | 21 | N870 Isolated PTP | PTP subdomainNumber |
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Cluster 8-i | 28 | Cluster 9-i | 29 | Cluster 10-i | 30 | Cluster 11-i | 31 | Cluster 12-i | 32 | Cluster 13-i | 33 | Cluster 14-i | 34 | Cluster 15-i | 35 |
Below is an wireshark example: You can see that the dependent on the Cluster settings, the device will add the subdomainNumber. Precision Time Protocol (IEEE1588) 0000 .... = transportSpecific: 0x0 .... 0000 = messageId: Sync Message (0x0) .... 0010 = versionPTP: 2 messageLength: 44 subdomainNumber: 21 flags: 0x0200 0... .... .... .... = PTP_SECURITY: False .0.. .... .... .... = PTP profile Specific 2: False ..0. .... .... .... = PTP profile Specific 1: False .... .0.. .... .... = PTP_UNICAST: False .... ..1. .... .... = PTP_TWO_STEP: True .... ...0 .... .... = PTP_ALTERNATE_MASTER: False .... .... ..0. .... = FREQUENCY_TRACEABLE: False .... .... ...0 .... = TIME_TRACEABLE: False .... .... .... 0... = PTP_TIMESCALE: False .... .... .... .0.. = PTP_UTC_REASONABLE: False .... .... .... ..0. = PTP_LI_59: False .... .... .... ...0 = PTP_LI_61: False correction: 0.000000 nanoseconds correction: Ns: 0 nanoseconds correctionSubNs: 0 nanoseconds ClockIdentity: 0x589ec6fffe0d8c73 SourcePortID: 1 sequenceId: 5275 control: Sync Message (0) logMessagePeriod: -1 originTimestamp (seconds): 0 originTimestamp (nanoseconds): 0 |
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