Creating and Adjusting a Microwave Link

Microwave links can be created after NEs and boards are configured.

Prerequisites

NEs exist on the U2000. The source and sink NEs of the microwave link to be created have been commissioned. For details, see Commissioning Guide.
A DCN has been configured. The U2000 Web LCT properly communicates with NEs.
The NE Panel displays IF boards and the ODUs to which they connect.

Context

In principle, the microwave link is connective only when the following parameters are consistent between the source and sink NEs:
- Protection
- Link ID
- XPIC
- Link ID - V
- Link ID - H
- Working Mode
- IF Service Type
- IF Channel Bandwidth
- Guaranteed E1 Capacity
- AM Status/AMAC Status
- Enable E1 Priority
- Full E1 Capacity
- T/R Spacing(MHz)
- ATPC
- Manually Specified Modulation Mode
- Modulation Mode of Guaranteed AM Capacity
- Modulation Mode of the Full AM Capacity
NOTE:
- The source and sink NEs do not have to use the same ODU transmit frequency and receive frequency, but the frequencies on the two NEs must be within the same range. Communication requires the ODU-received frequency to be the same as RX Frequency(MHz).
- The microwave link can be made connective even though IF Channel Bandwidth, Modulation Mode, AM Status/AMAC Status, E1 Priority, IF Service Type, and Protection are inconsistent between the source and sink NEs. However, if these parameters become inconsistent between the two NEs afterwards, the link may be interrupted. Therefore, use the same settings if possible.
If you are not sure about what parameters must be consistent, initialize IF boards by deleting and then adding them again. After the microwave link is connective, set parameters based on planned data.
NOTICE:
Initialization will interrupt services on boards.

NOTE:
If the default running modes of modem chips on the source and sink IF boards are different, set the modes based on actual site conditions.

Procedure

Set IF parameters of the source and sink NEs.
1. In the NE Explorer, select a board and choose Configuration > IF Interface from the navigation tree.
2. Click the IF Attributes tab.
3. Required: Set parameters in the IF Basic Attributes area and click Apply.
  NOTE:
  - For ISU2, ISX2, ISV3, ISU3 boards, pay attention to the running modes of modem chips.
    The default mode IS3 for ISV3 or ISU3 board is used when both interconnected IF ports support the IS3 mode.
    The compatible mode IS2 is used when an IF port is interconnected with an IF port on an ISU2 or ISX2 board.
  - For ISU2, ISX2, and ISV3 boards, the default IF Service Type is Native E1+Ethernet. Change it to IF Service Type if the network plan requires so.
    NOTE:
    After the IF service type is changed, the IF board will be reset. Wait until the IF board resets and set other IF information.
  - For ISX2 boards, set AM Boost Status based on planned data.
4. Required: Set Manually Specified Modulation Mode, Modulation Mode of Guaranteed AM Capacity, Modulation Mode of the Full AM Capacity, and E1 capacity in the Hybrid/AM Configuration area and click Apply.
5. Optional: Click the ATPC Attributes tab, set parameters, and click Apply.
6. Optional: Click the AM Advanced Attributes tab, set parameters, and click Apply.
Set ODU parameters of the source and sink NEs.
1. In the NE Explorer, select a board and choose Configuration > ODU Interface from the navigation tree.
2. Click the Radio Frequency Attributes tab, set Transmit Frequency(MHz) and T/R Spacing(MHz) of the ODU, and click Apply.
  NOTE:
  - The value of Transmit Frequency(MHz) must not be less than the sum of the minimum transmit frequency supported by the ODU and a half of the channel spacing, and must not be more than the difference between the maximum transmit frequency supported by the ODU and a half of the channel spacing.
  - The difference between the transmit frequencies at both ends of a radio link should be one T/R spacing.
  - If the ODU is a Tx high station, the transmit frequency is one T/R spacing higher than the receive frequency.
  - If the ODU is a Tx low station, the transmit frequency is one T/R spacing lower than the receive frequency.
  - A valid T/R spacing value is determined by the ODU itself, and T/R Spacing(MHz) should be set according to the technical specifications of the ODU.
  - The T/R spacing of the ODU should be set to the same value at both ends of a radio link.
3. Click the Power Attributes tab, set parameters, and click Apply.
  NOTE:
  - Maximum Transmit Power(dBm) is set according to the network plan. This parameter cannot be set to a value that exceeds the nominal power rang of the ODU in the guaranteed capacity modulation module.
  - The maximum transmit power adjusted by using the ATPC function should not exceed Maximum Transmit Power(dBm).
  - Transmit Power(dBm) is set according to the network plan. This parameter specifies the transmit power of the ODU. This parameter cannot be set to a value that exceeds the nominal power rang of the ODU or a value that exceeds Maximum Transmit Power(dBm).
  - Power to Be Received(dBm) is used to set the expected receive power of the ODU and is mainly used in the antenna alignment stage. After this parameter is set, the NE automatically enables the antenna misalignment indicating function.
  - Power to Be Received(dBm) is set according to the network plan. When this parameter takes the default value, the antenna misalignment indicating function is disabled.
  - TX High Threshold(dBm) and TX Low Threshold(dBm) are valid only when the ATPC function is enabled.
4. Click the Advanced Attributes tab, set ODU parameters, and click Apply.
  NOTE:
  - RF Loopback is used for fault locating for the RF interfaces. The RF Loopback function is used for diagnosis and may affect the services that are transmitted over the interfaces. Hence, exercise caution before starting this function. In normal cases, RF Loopback is set to Non-Loopback.
  - In normal cases, Configure Transmission Status is set to unmute.

Follow-up Procedure

Choose File > Discovery > Fiber/Cable/Microwave Link from the main menu (traditional style); alternatively, double-click Topo View in Application Center and choose File > Discovery > Fiber/Cable/Microwave Link from the main menu (application style). In the dialog box that is displayed, select an IF board from the object tree, search out a microwave link, and create the microwave link.