Sagem 4450E - Manual (Page 171)

SAGEM 3P@C
3P@C Installation Manual
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SAGEM SA
„ Able to access the Internet, but the speed for accessing is slow.
1) Whether the rate of Internet accessing is fast sometimes and slow at other times, or slow all along.
If it is slow all along, and the rate is below 500Kbps(60KByte ps), it is generally the problem of lines. The data
office NMS can be used to view the physical connection rate, and whether the ports have the limited rate and to
what extent the rate is limited. If the physical connection rate is high, it cannot be the problem of lines, and no
expansion of the broadband access server port may the cause. In addition, if the rate for accessing the Internet
has reached up to the port limit rate, the problem may lie in the limited port rate.
2) The line is quite short, but the rate for accessing the Internet cannot reach up to 2Mbps at all, first check the
physical connection rate of this port through the data office NMS and the line attenuation. If the physical
connection rate reaches up to 2Mbps or the rate limit, it shows the line is normal. In this case, check the setting
of interleaving depth. If the interleaving depth is 64, the TFTP files can be transmitted at a rate of
1.5Mbps(180KBps) at most due to the restriction of TCP/IP.
3) The physical connection rate of the port can be queried through the data office, and if the physical connection
rate is quite different from the file transmission rate, it is generally the bottleneck problem of upstream interface
node rate if the physical connection rate is normal.
4) Long lines, much line noise and poor quality of house lines may be the cause of the slow Internet accessing.
„ Able to access the Internet, but unstable, and often being disconnected.
This problem is often the result of too large high-frequency attenuation due to poor quality of lines or too long
lines, too much line noise and poor contact of lines, the following points can be the reference for problem
judgment:
1) First make a judgment as to whether the line exceeds 3km, if so, the line may be too long, or this problem still
exists in the ADSL subscribers around.
2) Check whether the front end of Modem is connected to other voice devices, such as IP dialer, which should
be removed.
3) Check whether the splitter is installed in the proper position. It is recommended to install it to the entrance of
the telephone line.
4) In disconnection, check whether a call is made or other electrical devices are used. Judge whether there is
any interference equipment.
5) Check the connectors of the house line and the plugs of the telephone wires, the aging of connectors and the
damages to the socket springs. Check the quality of house lines.
6) Check the connection configuration parameters and the connection parameters conditions of the related ports
on the DSLAM equipment.
7) Use the 112 to test the external lines in terms of length and attenuation, and analyze the test data.
„ Others
The faults rather than the above four are described as other faults, and make a detailed record about them.For
example, you can access the Internet but cannot make calls, which is generally the problem of line connectors.
This kind of faults may be the problem of house lines or ADSL connection. The specific description is as follows:
1) Common faults of house lines
The ADSL service faults generally occur to the house line, the following are the typical faults:
(1) Improper contact between the line plugs and the line socket, or insufficient elasticity of the spring steel wires
or it is deviated.
(2) The sockets of Line A and B become damp (especially in South with much rain), which leads to the lowering
of the insulation resistance of Line A and B or short-circuit -ground.