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NE40E-M2 V800R010C10SPC500 Configuration Guide - WAN Access 01

This is NE40E-M2 V800R010C10SPC500 Configuration Guide - WAN Access
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Configuring PRBS Testing

Configuring PRBS Testing

This section describes how to configure user-side and network-side PRBS testing.

Usage Scenario

PRBS testing is used to test service connectivity between two devices. A PRBS testing-enabled NE40E sends a PRBS bit stream to a remote device that has remote loopback enabled to perform a user-side test or to a remote device that has local loopback enabled to perform a network-side test. After the bit stream is looped back to NE40E, NE40E compares the bit stream with the one it previously sent and calculates a bit error rate to determine the service connectivity.

Pre-configuration Tasks

  • Before configuring user-side PRBS, ensure that remote loopback has been enabled on the remote device.
  • Before configuring network-side PRBS, ensure that local loopback has been enabled on the remote device.

Configuration Procedures

(Optional) Configuring UNI-Side PRBS Testing

After PRBS testing is enabled, you can perform a one-click test to check the service connectivity on the UNI side, that is, whether services between CE and PE are running properly.

Context

As shown in Figure 15-3, remote loopback is enabled on a base station, and service connectivity between PE1 and the base station is tested by enabling PE1 to send a PRBS bit stream to the base station.

NOTE:

Before performing a UNI-side PRBS test on a local device, you must configure remote loopback on the remote interface connecting to the local device. Services on the remote interface are then interrupted. After the test is completed, manually restore services on the remote interface.

Figure 15-3 UNI-side RPBS testing

NOTE:

Both the CE and PE1 are NE40Es in this example.

Procedure

  1. Configure remote loopback on the E1 interface of the CE connecting to PE1.
    1. Run system-view

      The system view is displayed.

    2. Run controller cpos cpos-number

      The CPOS interface view is displayed.

    3. Run e1 e1-number set loopback remote

      Remote loopback is enabled for the E1 interface.

  2. Perform a PRBS test on PE1.
    1. Run system-view

      The system view is displayed.

    2. Run test connectivity interface { interface-name | interface-type interface-number } uni-direction pattern pattern-list interval { hour hour-value | minute minute-value | second seconde-value } interval-repeat repeat-count

      An enhanced PRBS connectivity test on the user-side is started.

    3. Run test connectivity error-insert interface { interface-name | interface-type interface-number } { single-bit | insert-ratio ratio-list }

      Bit errors are injected into a PRBS bit stream while the enhanced PRBS connectivity test is going on.

    4. (Optional) Run test connectivity abort interface { interface-name | interface-type interface-number }

      The enhanced PRBS connectivity test is ended.

  3. After the PRBS test is completed, cancel the remote loopback configuration on the E1 interface of the CE.
    1. Run system-view

      The system view is displayed.

    2. Run controller cpos cpos-number

      The CPOS interface view is displayed.

    3. Run undo e1 e1-number set loopback

      Remote loopback of the E1 interface is canceled.

(Optional) Configuring Network-Side PRBS Testing

After PRBS testing is enabled, you can perform a one-click test to check the service connectivity on the NNI side, that is, whether the PW between PEs is functioning properly.

Context

As shown in Figure 15-4, PW connectivity between PE1 and PE2 can be tested by enabling PE1 to send a PRBS bit stream to PE2, which has local loopback enabled.

NOTE:

Before performing a NNI-side PRBS test on a local device, you must configure local loopback on the remote interface connecting to the local device. Services on the remote interface are then interrupted. After the test is completed, manually restore services on the remote interface.

Figure 15-4 Network-side RPBS testing

NOTE:

Both the PE1 and PE2 are NE40Es in this example.

Procedure

  1. Configure local loopback on the E1 interface of the PE2 connecting to PE1.
    1. Run system-view

      The system view is displayed.

    2. Run controller cpos cpos-number

      The CPOS interface view is displayed.

    3. Run e1 e1-number set loopback local

      Local loopback is enabled for the E1 interface.

  2. Perform a PRBS test on PE1.
    1. Run system-view

      The system view is displayed.

    2. Run test connectivity interface { interface-name | interface-type interface-number } nni-direction pattern pattern-list interval { hour hour-value | minute minute-value | second seconde-value } interval-repeat repeat-count

      An enhanced PRBS connectivity test is performed on a network-side low-speed interface.

    3. (Optional) Run test connectivity error-insert interface { interface-name | interface-type interface-number } { single-bit | insert-ratio ratio-list }

      Bit errors are injected into a PRBS bit stream while the enhanced PRBS connectivity test is going on.

    4. (Optional) Run test connectivity abort interface { interface-name | interface-type interface-number }

      The enhanced PRBS connectivity test is ended.

  3. After the PRBS test is completed, cancel the local loopback configuration on the E1 interface of the PE2.
    1. Run system-view

      The system view is displayed.

    2. Run controller cpos cpos-number

      The CPOS interface view is displayed.

    3. Run undo e1 e1-number set loopback

      Local loopback of the E1 interface is canceled.

Verifying the PRBS Testing Configuration

After configuring PRBS testing, verify the configuration.

Procedure

  • Run the display connectivity-test history interface { interface-name | interface-type interface-number } [ index index-value ] command to view the results of PRBS test instances on a specified interface.
  • Run the display connectivity-test history command to view PRBS historical test instances.

Example

Run the display connectivity-test command. The command output shows the results of PRBS test instances on a specified interface. For example:

<HUAWEI> system-view
[HUAWEI] display connectivity-test interface serial1/0/0/1:0
Summary: 
Start time           Side  Pattern  Phy-port   Total time (Interval*Round) 
2013-03-16 14:12:46  UNI   PRBS20   CPOS 1/0/0   00:01:40 (10s*10)
Total bits     Error bits     BER   LOS      Test progress 
136896000      69454          5e-4  0s       69%(00:01:09) finished.
Details: 
Round  Total bits   Error bits   BER   LOS     ES      EFS     SES     UAS 
1      19840000     0            0e-0  0s      0s      10s     0s      0s 
2      19840000     2            1e-7  0s      2s      8s      0s      0s 
3      19840000     6346         3e-4  0s      4s      6s      1s      0s 
4      19840000     19940        1e-3  0s      10s     0s      5s      0s 
5      19840000     19978        1e-3  0s      10s     0s      6s      0s 
6      19840000     19899        1e-3  0s      10s     0s      5s      0s 
7(90%) 17856000     3289         1e-4  0s      2s      7s      1s      0s
Error Bits Insert Record (Latest 10): 
Start time           Type        BER   Duration  Insert in round 
2013-03-16 14:12:58  Single      N/A   N/A       2 
2013-03-16 14:12:59  Single      N/A   N/A       2 
2013-03-16 14:13:13  Continuous  1e-3  17s       
3 to 5 2013-03-16 14:13:30  Continuous  1e-3  3s        5 
2013-03-16 14:13:33  Continuous  1e-3  15s       5 to now

Run the display connectivity-test history command. The command output shows PRBS historical test instances. For example:

<HUAWEI> system-view
[HUAWEI] display connectivity-test history
Connectivity test history on slot  2 :                                                                                              
Start time           Interface          Phy-port   Interval   Side  Pattern                                                         
2014-05-16 11:16:51  Serial0/1/0/1:1    Cpos0/1/0  1s*60      UNI   PRBS6                                                           
2014-05-16 11:20:16  Serial0/1/0/1:1    Cpos0/1/0  1s*60      UNI   PRBS6   

Example for Configuring a PRBS Test

This section provides an example on how to configure a PRBS test to check device connectivity when two devices are connected to each other through E1 interfaces.

Networking Requirements

On the network shown in Figure 15-5, Device A and Device B connect to each other through E1 interfaces. A PRBS test needs to be performed to check the connectivity between the two devices.

Figure 15-5 Networking diagram for configuring a PRBS test
NOTE:

In this example, interface1 and interface2 represent E1 0/1/0 and E1 0/2/0, respectively.



Configuration Roadmap

The configuration roadmap is as follows:
  1. Create a synchronous serial interface on Device A and Device B.
  2. Configure remote loopback on the E1 interface of Device B.
  3. Perform a PRBS test on Device A.
  4. Check the PRBS test result on Device A.
  5. After the PRBS test is completed, cancel the remote loopback configuration on the E1 interface of Device B.

Data Preparation

To complete the configuration, you need the following data:

  • E1 interface number of Device A

  • E1 interface number of Device B

Procedure

  1. Create a synchronous serial interface on Device A and Device B.

    # Configure the E1 interface on Device A as a synchronous serial interface.

    <HUAWEI> system-view
    [~HUAWEI] sysname DeviceA
    [*HUAWEI] commit
    [~DeviceA] controller e1 0/1/0
    [~DeviceA-E1 0/1/0] channel-set 1 timeslot-list 1-31
    [*DeviceA-E1 0/1/0] commit
    [~DeviceA-E1 0/1/0] quit
    

    # Configure the E1 interface on Device B as a synchronous serial interface.

    <HUAWEI> system-view
    [~HUAWEI] sysname DeviceB
    [*HUAWEI] commit
    [~DeviceB] controller e1 0/2/0
    [~DeviceB-E1 0/2/0] channel-set 1 timeslot-list 1-31
    [*DeviceB-E1 0/2/0] commit
    [~DeviceB-E1 0/2/0] quit
    

  2. Configure remote loopback on the E1 interface of Device B.

    [~DeviceB] controller e1 0/2/0
    [~DeviceB-E1 0/2/0] loopback remote
    [*DeviceB-E1 0/2/0] commit
    [~DeviceB-E1 0/2/0] quit
    

  3. Perform a PRBS test on Device A.

    [~DeviceA] interface serial 0/1/0:1
    [~DeviceA-Serial0/1/0:1] link-protocol tdm
    [*DeviceA-Serial0/1/0:1] commit
    [~DeviceA-Serial0/1/0:1] quit
    [~DeviceA] test connectivity interface Serial0/1/0:1 uni-direction pattern prbs15 interval second 20 interval-repeat 5

  4. Check the PRBS test result on Device A.

    [~DeviceA] display connectivity-test interface serial 0/1/0:1
    Summary:
    Start time           Side  Pattern  Phy-port   Total time (Interval*Round)
    2018-08-10 16:12:46  UNI   PRBS15   E1 0/1/0   00:01:40 (20s*5)
    Total bits     Error bits     BER   LOS      Test progress
    198400000      0              0e-0  0s       100%(00:01:40)finished
    Details:
    Round  Total bits   Error bits   BER   LOS     ES      EFS     SES     UAS
    1      39680000     0            0e-0  0s      0s      20s     0s      0s
    2      39680000     0            0e-0  0s      0s      20s     0s      0s
    3      39680000     0            0e-0  0s      0s      20s     0s      0s
    4      39680000     0            0e-0  0s      0s      20s     0s      0s
    5      39680000     0            0e-0  0s      0s      20s     0s      0s
    Error Bits Insert Record (Latest 10):
    Start time           Type        BER   Duration  Insert in round
    

  5. After the PRBS test is completed, cancel the remote loopback configuration on the E1 interface of Device B.

    [~DeviceB] controller e1 0/2/0
    [~DeviceB-E1 0/2/0] undo loopback
    [*DeviceB-E1 0/2/0] commit
    [~DeviceB-E1 0/2/0] quit
    

Configuration Files

  • Device A configuration file

    #
    sysname DeviceA
    #
    controller E1 0/1/0
     channel-set 1 timeslot-list 1-31
    #
    interface Serial0/1/0:1
     link-protocol tdm
    #
     test connectivity interface Serial0/1/0:1 uni-direction pattern prbs15 interval second 20 interval-repeat 5
    #
    return
  • Device B configuration file

    #
    sysname DeviceB
    #
    controller E1 0/2/0
     channel-set 1 timeslot-list 1-31
    #
    controller E1 0/2/0
     loopback remote
    #
    controller E1 0/2/0
     undo loopback
    #
    return
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Updated: 2019-01-02

Document ID: EDOC1100058399

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