We already brief  ZTE MW NR8250 Hardware Introduction (IDU and ODU) and continue to show typical configuration on NR8250.

 


1+0 No-Protection Configuration
  • In the 1+0 no-protection configuration, a microwave link has only one operating channel and does not have any standby channel.
  • NR8250 supports 1+0, 2×(1+0), N×(1+0) (N ≤ 6/12) networking configurations. The basic configuration 1+0 is shown in the following figure.

1+1 HSB Configuration
  • HSB is short for Hot Standby. In this configuration mode, 1+1 hot backup protection is implemented for RMUs and ODUs.
  • NR8250 supports 1+1, N×(1+1) (N ≤ 3/6) HSB configurations. The basic configuration 1+1 HSB configuration is shown in the following figure:


1+1 SD Configuration
  • SD is short for Space Diversity. In this configuration mode, 1+1 backup protection is implemented for channels. Two spatially-separated antennas are used to receive the same signal. The system selects the optimal one from the two received signals, which minimizes the impact of attenuation on signal transmission.
  • NR8250 supports 1+1, N×(1+1) (N ≤ 3/6) SD configurations. The basic configuration 1+1 SD configuration is shown in the following figure:
  • In 1+1 SD configuration, main ODU and standby ODU are installed on the different antennas.
    • In the transmitting direction: Service signals are transmitted to the active RMU and the standby RMU. Normally, the active ODU transmits RF signals to the antenna while the standby ODU does not transmit signal. When the active RMU or ODU becomes faulty, the active ODU stops transmitting signals and the standby ODU starts transmitting signals.
    • In the receiving direction: The system selects one channel of service signals with better signal quality from the two that are transmitted by the opposite-end active/standby ODUs.
  • In N × (1+1) SD configuration, the required material of a single site is shown in the following table:

1+1 FD Configuration
  • FD is short for Frequency Diversity. In this configuration mode, 1+1 backup protection is implemented for channels. Two channels with a certain frequency spacing are used to transmit and receive the same signals. The system selects the optimal one from the received two signals, which minimizes the impact of attenuation on signal transmission.
  • NR8250 supports 1+1, N×(1+1) (N ≤ 3/6) FD configurations. The basic configuration 1+1 FD configuration is shown in the following figure:
  • In 1+1 FD configuration, main ODU and standby ODU are installed on the same antenna to provide hardware level protection.
    • In the transmitting direction: Service signals are transmitted to the active RMU and the standby RMU. The active ODU transmits RF signals with the F1 frequency to the antenna, and the standby ODU transmits RF signals with the F2 frequency to the antenna. F1 and F2 are scarcely correlated.
    • In the receiving direction: The active ODU and the standby ODU respectively extract RF signals of F1 frequency and F2 frequency from the signals received from the antenna. The system selects the service signal with better quality from the corresponding RMU.
  • In N×(1+1) FD configuration mode, the required material of single site is shown in the following table:

2+0 XPIC No-Protection Configuration

NR8250 supports 2+0 XPIC, (N×2+0)(N ≤3/6) XPIC configurations. The diagram of 2+0 XPIC configuration is shown in the following figure:

2+2 XPIC HSB Configuration

2+2 XPIC HSB means each polarization of 2+0 XPIC is protected with hot standby configuration. Each NR8250 IDU offers 1 group 2+2 XPIC HSB configuration, see the following figure:

  • In the 2+2 XPIC HSB configuration mode, an active ODU and its standby ODU are connected to the same antenna through a combiner, providing HSB protection.
    • In the transmitting direction: Normally, the active ODUs transmit RF signals to the antennas while the standby ODUs do not transmit signals.
      • When an active ODU is faulty, the corresponding standby ODU transmits RF signals to the antenna while the active ODU does not transmit signals.
      • When an active RMUC is faulty, the corresponding standby RMUC modulates signals, and the corresponding standby ODU transmits RF signals to the antenna. The active ODU does not transmit signals.
    • In the receiving direction: The system selects one channel of service signals with better signal quality from the two that are transmitted by the opposite-end active/standby ODUs.
  • In 2+2 XPIC HSB configuration mode, the required material of single site is shown in the following table.

2+2 XPIC SD Configuration

2+2 XPIC SD means each polarization of 2+0 XPIC is protected with space diversity configuration. Each NR8250 IDU offers 1 group 2+2 XPIC SD configuration, see the following figure.


  • In the 2+2 XPIC HSB configuration mode, an active ODU and its standby ODU are connected to the different antennas.
    • In the transmitting direction: Normally, the active ODUs transmit RF signals to the antennas while the standby ODUs do not transmit signals.
      • When an active ODU is faulty, the corresponding standby ODU transmits RF signals to the antenna, and the active ODU does not transmit signals.
      • When an active RMU is faulty, the corresponding standby RMU modulates signals, and the corresponding standby ODU transmits RF signals to the antenna. The active ODU does not transmit signals.
    • In the receiving direction: The system receives the service signal with better signal quality from the two that are transmitted by the opposite-end active/standby ODUs.
  • In 2+2 XPIC SD configuration mode, the required material of single site is shown in the following table: