Configuring Static 1588v2 Functions

Applicable Environment

To manually determine the master/slave relationship between clock nodes within a network, run the ptp port-state command to set the status of 1588v2 interfaces on the nodes. Static clock source selection and dynamic BMC selection are two independent mechanisms. Static clock source selection has a higher priority than dynamic BMC selection.

The 1588v2 status needs to be specified on OC, BC, and TCandBC interfaces. The 1588v2 status is Premaster on TCs interfaces, including those on TCOC and TCandBC devices.

• Typical static 1588v2 network with OC, BC, TC, and TCOC devices

  The OC on the 1588v2 network shown in Figure 1 functions as the grandmaster to receive time signals provided by a BITS or GPS and sends 1588v2 packets carrying the time signals over the bearer network. TCs, including the TCOC, are core devices on the bearer network. TCs transparently transmit time information over the bearer network. The TCOC can also implement frequency synchronization. BCs at the edge of the bearer network send highly accurate time information carried in 1588v2 packets to wireless access devices, such as NodeBs and radio network controllers (RNCs).

  Figure 1 Static 1588v2 application
  
  

• Typical static 1588v2 network with TCandBC devices

  All devices, including the NodeB, run 1588v2 on the network shown in Figure 2. ISP A's network contains the NodeB, OC2, and BC. OC2 is connected to BITS2 on ISP A's network. ISP A's network has no bearer network device. ISP A's network has no bearer network device. ISP A leases the bearer network that ISP B operates, and ISP B devices trace clock signals of BITS1. Time synchronization on ISP A's network is independent of that on ISP B's network. Devices on ISP A's and ISP B's networks support static 1588v2. The deployment is as follows:

  • Establish domain1 for ISP B's 1588v2 network and domain2 for ISP A's 1588v2 network.
  • OC1 in domain1 obtains BITS1 signals and sends 1588v2 packets carrying clock synchronization information to the BC interface that directly connects the TCandBC to OC1.
  • OC2 in domain 2 is selected as the grandmaster and connected to BITS2. OC2 sends downstream 1588v2 packets carrying clock information. TC interfaces connect the TCandBC to OC2 and to the BC. The TC interfaces transparently transmit BITS2 time information to the BC. Upon receipt, the BC advertises the time information to the NodeB.
  Figure 2 Typical static 1588v2 network with a TCandBC
  
  

Pre-configuration Tasks