1588 Adaptive Time Recovery (ATR) is a PTP-based technology that allows routers to establish clock links and implement time synchronization over a third-party network using PTP packets in Layer 3 unicast mode.
1588 ATR is an advancement compared to 1588v2, the latter of which requires 1588v2 support on all network devices.
1588 ATR is a client/server protocol through which servers communicate with clients to achieve time synchronization.
When the time server (such as the SSU2000) supports only the 1588v2 unicast negotiation mode, the client sends a negotiation request to the server, and the server sends time synchronization packets to the client after the negotiation is established. The client is configured with the 1588 ATR hop-by-hop mode and interconnected with the time server to achieve time synchronization in 1588v2 unicast negotiation mode. After that, the client can function as a BC to provide time synchronization for downstream NodeBs.