Huawei DBS3900 Transmission and Synchronization

This article describes the transmission and synchronization modes supported by the DBS3900.

Transmission

The DBS3900 provides the following transmission features:

  • Transmission and check at GE optical/electrical ports
  • IPv4 route configuration management
  • DHCP blind startup and remote login and maintenance for eOMC910
  • VLAN and IP-QoS DiffServ mechanisms
  • GE optical/electrical satellite and microwave transmission.

Synchronization

Synchronization refers to that the phase variation or frequency variation between two or more signals stays within the specified range within a specific time.

Clock synchronization allows the eNodeB to synchronize with the reference clock. With this function, the clock frequency or time offset between the eNodeB and other equipment can be maintained within a permitted range to avoid bad transmission performance due to incorrect location of receiving and transmitting data in the transmission system.

Clock synchronization includes:

  • Frequency synchronization: The frequency of a signal is the same as the reference frequency but the start time of the signal does not need to be the same as that for the reference clock.
  • Time synchronization: also referred to as time-of-day synchronization. The start time for a signal needs to be synchronized with the UTC. Therefore, time synchronization implies synchronization in absolute time, the signal frequency is in accordance with the reference frequency. The UTC is a universal timing standard, in which the atomic clock is maintained accurately to ensure time synchronization across the world, with the precision to microseconds.

The DBS3900 in the TDD mode supports the following time synchronization methods:

  • GPS time synchronization.

    In this case, each DBS3900 is configured with a GPS receiver by which the DBS3900 obtains clock signals with the precision to microseconds. The GPS satellite antenna receives GPS signals and transmits them to the UMPTb2 or LMPT board, and then these signals are provided to the DBS3900 after being processed by the GPS satellite card.

  • GPS&GLONASS time synchronization.

    In this case, each DBS3900 is configured with the USCUb22 board. The GPS&GLONASS satellite signal is sent to the USCUb22 through the receiver, and then the signal is processed by the GPS&GLONASS satellite card for the base station use. The GPS&GLONASS satellite card and the receiver must be bought and installed by the customer.

  • IEEE 1588v2 time synchronization.
  • 1PPS+TOD time synchronization.

The DBS3900 in the FDD mode supports GPS frequency synchronization and IEEE 1588v2 frequency synchronization (IPCLK).

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