NR8250 is mainly used as aggregation node of TDM, hybrid and packet backhaul network, which provides nodal transmission solution for high capacity transmission.
By providing multi-service access boards and carrier grade Ethernet function, NR8250 can be used in different scenarios:
  • Predominant hybrid backhaul network With dual switching panel design, hybrid & native transmission architecture, versatile TDM and IP interface cards, NR8250 can meet the requirements of hybrid backhaul adequately.
  • All-packet mobile backhaul network NR8250 provides TDM circuit emulation and packet switching function for 3G & LTE networks.
  • All-IP Enterprise networks, fixed broadband last mile access and other applications.

IDU Hardware

IDU Technical Specifications



IDU Hardware Architecture

The NR8250 IDU comprises a subrack and series of boards. The subrack is 19 inches in width and 2U in height. the following figure shows the hardware architecture of the IDU:


RCUC2

Radio Core Cross Unit performs the following functions:

  • Provides the core cross switching function.
  • Performs intra-shelf control plane switching management.
  • Provides the Intelligent Platform Management Bus (IPMB) management function.
  • Provides the intra-shelf clock synchronization and distribution function.
  • Supports one Network Management System (NMS) interface (GE), one local debugging interface (FE), one USB interface and two GbE interfaces.
  • Supports enhanced Ethernet switching capabilities – 64Gbits/s.
  • Supports 4+0 SPLA (intra-IDU/inter-IDU).
  • Supports enhanced LAG.
  • Supports HQoS.
  • Supports performance statistic per VLAN Pri/DSCP/Queue.
  • Provides IP MPLS/MPLS-TP hardware ready besides enhanced ETH.

RMUF

The RMUF board is a modulation and demodulation board. It provides the following functions:

  • Converts uplink baseband signals into IF signals through coding and modulation, and sends the IF signals to the ODU. The uplink baseband signals are transmitted from the main control unit to the RMUF board through the backplane.
  • Decodes and demodulates downlink IF signals and sends the demodulated signals to the main control unit. The downlink IF signals are transmitted from the ODU to the RMUF board through an IF cable.
  • Provides a communication channel between the IDU and the ODU, and manages and monitors the ODU.
  • Provides –48 V power to the ODU.
  • Supports 1 + 1 protection.
  • Supports XPIC.
  • Supports TDM and GE services.
  • Supports system clock synchronization.
  • Supports ACM (QPSK/16QAM/32QAM/64QAM/128QAM/256QAM/512QAM/1024QAM/1024QAM light).

RTUNO

RTUNO is the transmission service board. It performs the following functions:

  • Provides four channels of GE/FE Ethernet access, which are four channels of GE/FE (optical interface) or two channels of GE/FE (optical interface) plus two channels of GE/FE (electrical interface).
  • Implements Ethernet OAM protocol processing.
  • Performs Ethernet synchronization and 1588V2 protocol processing.

RMUE
The RMUE board is a modulation and demodulation board. It provides the following functions:

  • Converts uplink baseband signals into IF signals through coding and modulation, and sends the IF signals to the ODU. The uplink baseband signals are transmitted from the main control unit to the RMUE board through the backplane.
  • Decodes and demodulates downlink IF signals and sends the demodulated signals to the main control unit. The downlink IF signals are transmitted from the ODU to the RMUE board through an IF cable.
  • Provides a communication channel between the IDU and the ODU, and manages and monitors the ODU.
  • Provides –48 V power to the ODU.
  • Supports 1 + 1 protection.
  • Supports TDM and GE services.
  • Supports system clock synchronization.
  • Supports ACM (QPSK-256QAM).

ODU Hardware

ODU Functions

 ODU supports all bands (6, 7, 8, 10, 11, 13, 15, 18, 23, 26, 28, 32, 38, 42 GHz) . It is used to implement frequency conversion and amplification of signals. The specific functions are as follows:

  • In the transmit direction, ODU performs up conversion and amplification for the analog IF signal received from IDU for several times and converts it to RF signal at a specific frequency. Then the ODU forwards the RF signal to the antenna.
  • In the receive direction, ODU performs down conversion and amplification for the RF signal received from the antenna for several times and converts it to analog IF signal at a specific frequency. Then it sends the IF signal to the IDU.
  • Provides a control channel, through which IDU can control and manage ODU.
  • Provides the Automatic Transmitter Power Control (ATPC) function.
  • Provides various alarm and performance messages
  • Provides the detection of ODU transmitting power and Received Signal Strength Indicator (RSSI)
  • Supports the query of ODU equipment information
  • Supports the silence/emission setting of ODU


More detail about IDU boards refer to ZXMW NR8250 Product Description