Configuring 1588v2 on a TCandBC
TCandBC Deployment
In Figure 1, all devices on the bearer network
and NodeBs support 1588v2. CarrierA has NodeBs and an external clock
source2, but does not have bearer network devices. CarrierB leases
its bearer network to CarrierA. Devices on the bearer network synchronize
with the external clock source1 of CarrierB. To ensure that clock
synchronization is implemented independently on devices of CarrierA
and CarrierB, you can deploy the network as follows:
- BC1 and OC1 connect to clock1 and clock2 respectively, and send clock synchronization information to downstream devices through 1588v2 messages.
- TCandBC1 directly connects to BC1 through a BC interface and participates in clock synchronization in Domain 1. The user-side interface of TCandBC1 is a TC interface.
- TCandBC2 directly connects to BC1 through a BC interface and participates in clock synchronization in Domain 1. The user-side interface of TCandBC2 is a TC interface.
- Interfaces that directly connect TCandBC2 to OC2, TCandBC2 to TCandBC1, and TCandBC1 to OC1 provide the TC function. OC2 receives 1588v2 messages sent from TCandBC1 through the PW channel between TCandBC1 and TCandBC2, synchronizes clock information with TCandBC1, and then sends clock information to NodeB using traditional synchronization methods such as synchronous Ethernet.
- The bearer network has two PTP domains: Domain 1 and Domain 2. All devices in Domain 1 function as BCs to implement PTP synchronization and transmit messages between TCandBC1 and TCandBC2. For Domain 2, the entire bearer network functions as a large TC, which transparently transmits clock2 information to NodeB.
Pre-configuration Tasks
Before configuring 1588v2 on a TCandBC, complete the following tasks:
Set link layer protocol parameters for interfaces to ensure that the link layer protocol status of the interfaces is Up.
Ensure that the OC1 and OC2 correctly receive clock and time signals from the clock.
Configure synchronous Ethernet to synchronize the clock frequency on the network.