SAGEM 3P@C

13.2.2.Processing Procedure

Step 1 Show the port configuration of both parties, and check the working mode of their ports in actual circumstances

Step 2 Check whether there is any wrong statistics in the statistical information about ports.

Step 3 Check whether the making of network cables meets the EIA/TIA 568A/B standard. Network cables can be changed if necessary.

Step 4 Do the test of changing the upstream electric interface.

13.2.3.Typical Cases

1.1.1.73Case 1:

1.1.1.73.1Background

The phenomenon of intermittent make-break and even no make occurs to the services after interconnection when a certain office uses the electrical interface module and the peer equipment of 3P@C 4450E for interconnection via the UTP cable.

1.1.1.73.2Fault symptom

The phenomenon of intermittent make-break and even no make occurs to the services after interconnection when a certain office uses the LAN of DSLAM for interconnection. Check the data configuration and the physical connection for correctness, the LINK indicator of the network cable is green. And the problem of upper-layer network communication has been excluded.

1.1.1.73.3Analysis and troubleshooting:

Step 1 Check the port modes of the equipment at both ends, they are all the 10/100M auto-adaptation mode, and the result of the interconnection is 100M.

Step 2 View the statistical information of the ports, and find a number of CRC

Error alarms.

Step 3 Upon obtaining the consent from the customer, check the network cables used for the upper connection, it is found that the network cables have not been made according to the standard linear ordering, and only the color labels of both parties are made the same.

Step 4 After we use the EIA/TIA 568B standard linear ordering mode to remake the network cable, the service becomes normal.

1.1.1.73.4Summary

A minute problem can often affect the whole work. A low-grade mistake (of not understanding the basic method and standard for making the network cables) made by the implementing party leads to a seemingly weird problem. Such a problem as intermittent make-break should be solved in basic principles.

The standard linear ordering of network cables: Yellowish white, yellow, greenish white, blue, bluish white, green, brownish white and brown, and the same at both ends. This kind of network cables can be used for the connection of 10M/100M lines. While the practice of making the linear ordering of both ends consistent

Note can only applied to the connection of 10M lines. The ports auto- negotiated to 100M, however, is connected using the 10M

network cable, the packets are inevitably to collide, which leads to the intermittent make-break or not make of the service.

3P@C Installation Manual

Page 13-3

Reproduction and communication in any form prohibited without the written permission of

SAGEM SA