Got it

The serial interface troubleshooting procedure Highlighted

Latest reply: Jul 24, 2017 14:52:25 2808 3 0 0 0

Hello everyone,

This post refers to the serial interface troubleshooting procedure. Please read below for more details.

1.Common Causes

This fault is commonly caused by one of the following:

l  Cables at both ends are incorrectly connected.

l  Configurations at both ends are inconsistent.

2.Troubleshooting Flowchart

Figure 1-1 shows the troubleshooting flowchart.

Figure 1-1 Troubleshooting flowchart for statistics on sent and received data packets are incorrect on the serial interface

20170710135635035001.png

 

3.Troubleshooting Procedure

note

Saving the results of each troubleshooting step is recommended. If your troubleshooting fails to correct the fault, you will have a record of your actions to provide Huawei technical support personnel.

Procedure

                     Step 1    A synchronous/asynchronous serial interface works in DTE or DCE mode. One device functions as the DTE and the other device functions as the DCE. Verify that the directly connected cable between the DCE and DTE is delivered by Huawei.

l  If the directly connected cable between the DCE and DTE is not delivered by Huawei, replace the cable.

l  If the directly connected cable between the DCE and DTE is delivered by Huawei, go to step 2.

                     Step 2    Verify that the pin assignment is correct.

l  If the pin assignment is incorrect, correct the pin assignment.

l  If the pin assignment is correct, go to step 3.

                     Step 3    Perform local loopback to check whether the 1SA/2SA card works properly.

Run the loopback local command in the serial interface view to check the serial interface configuration.

l  If the 1SA/2SA card does not work properly, replace the 1SA/2SA card.

l  If the 1SA/2SA card works properly, go to step 4.

                     Step 4    Verify that the configurations of the local and remote physical interfaces are consistent.

Run the display this command in the serial interface view to check the serial interface status.

Check whether physical attributes of two interfaces are consistent. The two interfaces must use the same operation mode, coding format, and idle code except the clock mode. The two interfaces must use different clock modes, that is, one end uses the master clock, and the other end uses the slave clock.

l  If the two interfaces have inconsistent configurations or frequently alternate between Up and Down states, reconfigure them.

l  If the two interfaces have consistent configurations and remain Up, go to step 5.

                     Step 5    View interface statistics on the local device and check whether there are a large number of error packets in the inbound direction.

<Huawei> display interface serial 1/0/0
Serial1/0/0 current state : UP                                                  
Line protocol current state : UP                                              
Description:HUAWEI, AR Series, Serial1/0/0 Interface 
Route Port,The Maximum Transmit Unit is 1500, Hold timer is 10(sec)             
Internet protocol processing : disabled                                         
Link layer protocol is PPP                                                       
LCP initial                                                                     
Last physical up time   : 2013-01-02 00:14 UTC+08:00                         
Last physical down time : 2013-01-02 00:14 UTC+08:00                         
Current system time: 2013-01-02 00:14+08:00                                  
Physical layer is synchronous, Virtualbaudrate is 64000 bps                     
Interface is DTE, Cable type is V35, Clock mode is TC                           
Last 300 seconds input rate 2 bytes/sec 16 bits/sec 0 packets/sec               
Last 300 seconds output rate 0 bytes/sec 0 bits/sec 0 packets/sec               
                                                                                
Input: 9714 packets, 213708 bytes                                               
  Broadcast:              0,  Multicast:              0                         
  Errors:                0,  Runts:                 0                         
  Giants:                0,  CRC:                    0                         
                                                                                
  Alignments:            0,  Overruns:              0                         
  Dribbles:               0,  Aborts:                 0                         
  No Buffers:             0,  Frame Error:            0                         
                                                                                
Output: 0 packets, 22 bytes                                                      
  Total Error:            0,  Overruns:               0                         
  Collisions:             0,  Deferred:               0                         
                                                                                 
DCD=UP DTR=UP DSR=UP RTS=UP CTS=UP                                              
    Input bandwidth utilization  : 0.10%                                        
    Output bandwidth utilization :    0%    

l  If there are a large number of error packets in the inbound direction, run the invert receive-clock command to configure the device to invert clock signals received by a synchronous serial interface.

l  If there is no error packet in the inbound direction, go to step 6.

                     Step 6    View interface statistics on the remote device and check whether there are a large number of error packets in the inbound direction.

l  If there are a large number of error packets in the inbound direction, run the invert transmit-clock command to configure the device to invert clock signals sent by a synchronous serial interface.

l  If there is no error packet in the inbound direction, go to step 7.

                     Step 7    Verify that the virtual baud rate (virtualbaudrate) on the DTE is the same as the baud rate (baudrate) on the DCE. If the baud rates are different, packets are discarded.

l  If the baud rates are different, set the baud rates to be the same.

l  If the baud rates are the same, go to step 8.

                     Step 8    Collect the following information and contact technical support personnel.

l  Results of the preceding troubleshooting procedure

l  Configuration file, logs, and alarms of the device

  • x
  • convention:

gululu
Created Jul 10, 2017 06:20:37

thanks !
View more
  • x
  • convention:

walidnawar
Created Jul 24, 2017 14:51:52

  • x
  • convention:

walidnawar
Created Jul 24, 2017 14:52:25

Good Job!The serial interface troubleshooting procedure-2330269-1
View more
  • x
  • convention:

Comment

You need to log in to comment to the post Login | Register
Comment

Notice: To protect the legitimate rights and interests of you, the community, and third parties, do not release content that may bring legal risks to all parties, including but are not limited to the following:
  • Politically sensitive content
  • Content concerning pornography, gambling, and drug abuse
  • Content that may disclose or infringe upon others ' commercial secrets, intellectual properties, including trade marks, copyrights, and patents, and personal privacy
Do not share your account and password with others. All operations performed using your account will be regarded as your own actions and all consequences arising therefrom will be borne by you. For details, see " User Agreement."

My Followers

Login and enjoy all the member benefits

Login

Block
Are you sure to block this user?
Users on your blacklist cannot comment on your post,cannot mention you, cannot send you private messages.
Reminder
Please bind your phone number to obtain invitation bonus.