E1 BER detection introduction

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An E1 interface that supports E1 BER measurement uses the PRBS technique to generate, send, and receive PRBS bit sequences. The E1 interface then calculates the proportion of error bits to the total bits to obtain the BER for measuring E1 link quality.

Other related questions:
E1 error packet analysis and loopback detection method
1. Causes and solutions for error packets on the E1/SA interface E1 interface: - A lot of error packets are detected in CRC. The CRC-16 algorithm is used on Huawei devices by default. You can try to resolve this problem by using the CRC-32 algorithm. - No Buffers: Input or output traffic suddenly surges. If the sudden surge of input traffic is measured, a downlink CAR can be set for the upstream device. If the sudden surge of output traffic is measured, a CAR can be set on the egress of the Huawei device. - The state of the E1-M interface (unframed) cannot be Up after the cable connected to it is disconnected first and then connected again. In this case, you can try to disable the AIS detection by running the undo detect-ais command in controller configuration mode. - Alignments error packets are measured. In this case, you can run the following command to modify the clock and ensure that one of the clocks on both ends is the master clock: fe1 clock master SA interface: - A lot of error packets are detected in CRC. The CRC-16 algorithm is used on Huawei devices by default. You can try to resolve this problem by using the CRC-32 algorithm. - If the number of input error packets of the AR router surges when the AR router is in DTE mode, you can try to invert the receive clock by running the following command: invert receive-clock If the number of input error packets of the peer device surges, you can try to invert the transmit clock by running the following command: invert transmit-clock - When the AR router is in DTE mode, run the following command to adjust the bandwidth of the interface by setting the virtual baud rate based on the actual bandwidth of physical links. virtualbaudrate baudrate (the baud rate is 64 kbit/s by default) 2. Interconnection failures between the E1 interface and devices of competitors - Check the configuration and confirm that no error packets are detected on the interface, eliminating possibilities of error packets being caused by configurations, CRC, or cables. - Check causes by segments. 3. GE optical interface interconnection failures List of consulted problems - The state of the optical interface of AR2240 or AR3260 cannot be Up after AR2240 or AR3260 is connected to an optical module. An optical-electrical multiplex interface works as an electrical interface by default. Therefore, the interface must be manually configured as an optical interface if the AR router is connected to an optical module. You can run the combo-port fiber command to configure the interface as an optical interface. - Information about the optical module is not displayed after the display transceiver command is run. Only information about optical modules authorized by Huawei is displayed after the command is run. - Does AR2240/3260 support both 100M and 1000M optical modules and adapt its rate to different optical modules? AR2240/3260 supports both 100M and 1000M optical modules and can adapt its rate to different optical modules. For details, see the following URL: FAQ-E1错包分析和自环检测方�?/a>.

BER calculation formula
BER calculation formula: B1 BER = Number of B1 errored blocks/(N x 270 columns x 9 rows x 8 bits x 1s x 8000 frame/second).    Note: N in the preceding formula is the number in STM-N. B2 BER = Number of B2 errored blocks/{[(261columns x 9 rows) + (9 columns x 5 rows)] x 8 bits x 1s x 8000 frame/second}. B3 BER = Number of B3 errored blocks/(261 columns x 9 rows x 8 bits x 1s x 8000 frame/second).

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