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连接最高级时钟 GMC
如果为交换机连接最高级时钟, 设备应可单播延迟请求包。
数据包字段建议值:
defaultDS.priority1: 128
defaultDS.priority1: 128
defaultDS.domainNumber: 127
defaultDS.slaveOnly: FALSE
portDS.logAnnounceInterval: -2 (this is 250ms)
portDS.announceReceiptTimeout: 3 (the number of announce intervals that have to
pass without receipt of an announce message before the occurrence of the event
ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES)
portDS.logSyncInterval: -3 (this is 125ms)
portDS.delayMechanism: 01h (we do only Delay request-response, aka End-to-End)
portDS.logMinPDelayReqInterval: -3 (equal to portDS.logSyncInterval)
transparentClockDefaultDS.delayMechanism: 01h (we do only End-to-End)
transparentClockDefaultDS.primaryDomain: 127 (same as defaultDS.domainNumber)
portDS.logMinDelayReqInterval: -3 (equal to portDS.logSyncInterval)
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