IF Attributes

The IF information of the microwave interface specifies the relevant information of the IF board, including the AM attribute and ATPC attribute. In this interface, you can set the IF attributes of a microwave interface.

Navigation Path

In the NE Explorer, select the board and choose Configuration > Interface Management > Microwave Interface from the Function Tree. Click the IF Attributes tab.
In the NE Explorer, select an NE and choose Configuration > Interface Management > Microwave Interface from the Function Tree. Click the IF Attributes tab.

Parameters

**Table 1** Descriptions of the parameters for IF Attributes
Field	Value	Description
Port	slot number-board name-port number(port name)	Displays the name of a microwave port.
Microwave Link ID	1 to 4094	Sets the microwave link ID. Click Microwave Link ID for more information. NOTE: As the identifier of a microwave link, this parameter is used to avoid misconnection of microwave links between sites. Set this parameter according to the planning. Each microwave link of an NE should have a unique Link ID, and the Link IDs at both the ends of a microwave link should be the same. If this parameter is different from Received Link ID, the NE reports the MW_LIM alarm and inserts the AIS into the downstream. Before performing the loopback operation for the IF board, disable the AM function at the two ends of a link.
Received Microwave Link ID	1 to 4094	Queries the microwave link ID that is received. The signals that are received at an end is effective only when the link IDs are matched. When the received link ID does not match the expected link ID, an end inserts the AIS signal to the services in the downstream direction and reports a link ID mismatch alarm to the U2000 Web LCT. NOTE: When the queried value is 0, it indicates that no link information is received. When the queried value is 62235, it indicates that loopback and other logical errors exist.
Enable AM	Enabled, Disabled Default: Disabled	Adaptive and coding modulation (AM) When you set this parameter to Enable, the microwave link uses the corresponding modulation scheme based on the channel conditions. When this parameter is set to Disable, the microwave link uses the specified modulation scheme only. In this case, you need to select Manually Specified Modulation Mode.
Channel Space	For example: 40MHz	Displays the channel spacing of the corresponding microwave link. NOTE: The value of channel space varies between different versions of the equipment.
Guaranteed Capacity Modulation Format	QPSK, 16QAM, 32QAM, 64QAM, 128QAM, 256QAM, 512QAM, 1024QAM, 2048QAM, QPSKStrong, 16QAMStrong, 512QAMLight, 1024QAMLight,QPSKStrong_250M, QPSKStrong_500M	Specifies the lowest-order modulation scheme that the AM function supports. This parameter is set according to the network plan. Generally, the value of this parameter is determined by the service transmission bandwidth that the Hybrid radio must ensure and the availability of the microwave link that corresponds to this modulation scheme. This parameter is configurable only when AM Status is set to Enable. NOTE: This parameter can be set to 512QAM, 1024QAM, QPSKStrong, 16QAMStrong, 512QAMLight, or 1024QAMLight only when Running Mode of the board is IS3.
Full Capacity Modulation Format	QPSK, 16QAM, 32QAM, 64QAM, 128QAM, 256QAM, 512QAM, 1024QAM, 2048QAM, QPSKStrong, 16QAMStrong, 512QAMLight, 1024QAMLight,QPSKStrong_250M, QPSKStrong_500M	Specifies the highest-order modulation scheme that the AM function supports. This parameter is set according to the network plan. Generally, the value of this parameter is determined by the bandwidth of the services that need to be transmitted over the Hybrid radio and the availability of the microwave link that corresponds to this modulation scheme. This parameter is configurable only when AM Status is set to Enable. NOTE: This parameter can be set to 512QAM, 1024QAM, QPSKStrong, 16QAMStrong, 512QAMLight, or 1024QAMLight only when Running Mode of the board is IS3.
Manually Specified Modulation Format	QPSK, 16QAM, 32QAM, 64QAM, 128QAM, 256QAM, 512QAM, 1024QAM, 2048QAM, QPSKStrong, 16QAMStrong, 512QAMLight, 1024QAMLight,QPSKStrong_250M, QPSKStrong_500M	specifies the modulation scheme that the microwave link uses for signal transmission. This parameter is configurable only when AM Status or AMAC Status is set to Disable. NOTE: This parameter can be set to 512QAM, 1024QAM, QPSKStrong, 16QAMStrong, 512QAMLight, or 1024QAMLight only when Running Mode of the board is IS3.
Enable ATPC	Enabled, Disabled Default: Disabled	This parameter specifies whether the ATPC function is enabled. The ATPC function enables the transmit power of a transmitter to automatically trace the change of the received signal level (RSL) at the receive end within the ATPC control range. In the case of areas where fast fading is severe, it is recommended that you set this parameter to Disabled.
Enable ATPC Automatic Threshold Adjustment	Enable, Disable Default: Enable	When you set this parameter to Enabled, the equipment adjusts the ATPC threshold automatically based on the link status. This parameter is available only when you set Enable ATPC to Enabled.
ATPC Upper Threshold (dBm)	-85 to -20	When the ATPC function is enabled, if the RSL at the receive end is higher than the preset ATPC upper threshold at the receive end, the receiver notifies the transmitter to decrease the transmit power according to the preset ATPC adjustment step at the transmit end until the RSL is lower than the ATPC upper threshold. Generally, ATPC Upper Threshold (dBm) should be 20 dB to 30 dB higher than ATPC Lower Threshold (dBm), and must not be less than 15 dB. If the difference between the upper threshold and the lower threshold is big, the number of ATPC adjustments is reduced and the system load is also reduced. If the difference between the upper threshold and the lower threshold is small, the transmit power is adjusted in a timely manner and the interference to adjacent systems is reduced.
ATPC Lower Threshold (dBm)	-90 to -25	When the ATPC function is enabled, if the RSL at the receive end is lower than the preset ATPC lower threshold, the receiver notifies the transmitter to increase the transmit power according to the preset ATPC adjustment step at the transmit end until the RSL is higher than the ATPC lower threshold. Generally, set this parameter to a value of 10 dB or greater than the receiver sensitivity to prevent sudden fast fading because sudden fast fading makes the RSL value lower than the receiver sensitivity.
Current Working Modulation Format at Transmit End	QPSK, 16QAM, 32QAM, 64QAM, 128QAM, 256QAM, 512QAM, 1024QAM, 2048QAM, QPSKStrong, 16QAMStrong, 512QAMLight, 1024QAMLight,QPSKStrong_250M, QPSKStrong_500M	Displays the current modulation mode at the transmit end.
Current Working Modulation Format at Receive End	QPSK, 16QAM, 32QAM, 64QAM, 128QAM, 256QAM, 512QAM, 1024QAM, 2048QAM, QPSKStrong, 16QAMStrong, 512QAMLight, 1024QAMLight,QPSKStrong_250M, QPSKStrong_500M	Displays the current modulation mode at the receive end.
AM Guaranteed Service Capacity (Mbit/s)	-	Displays the minimum service capacity in the AM mode.
AM Full Service Capacity (Mbit/s)	-	Displays the maximum service capacity in the AM mode.
Capacity of Currently Transmitted Services in AM Mode (Mbit/s)	-	Displays the capacity of services that are currently transmitted.
Capacity of Currently Received Services in AM Mode (Mbit/s)	-	Displays the capacity of services that are currently received.

**Table 2** AM Switching History
Field	Value	Description
Port	slot number-board name-port number(port name)	Displays the port on which the AM switching happens.
Event No.	For example: 0	Displays the number of the event.
AM Switching Time	For example: 11/11/2011 11:48:03	Displays the AM switching time.
Switching Mode	For example: Manual Switch	Displays the switching mode.
Target Modulation Mode	For example: 16QAM	Displays the target modulation mode.
Time Stamp	For example: 4080431	Displays the time stamp.

Parent topic: Microwave Interface

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