Sagem 4450E - Manual (Page 186)

SAGEM 3P@C
3P@C Installation Manual
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SAGEM SA
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
1.1.1.73 Case 1:
1.1.1.73.1 Background
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.
1.1.1.73.2 Fault 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.
1.1.1.73.3 Analysis 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.
1.1.1.73.4 Summary
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.
Note
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
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.