Sagem 4450E - Manual (Page 180)

SAGEM 3P@C
3P@C Installation Manual
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„ Whether the line exceeds the recommended distance.
„ Whether there are wires other than copper wires in the line, such as iron wires or aluminium
wires.
„ Whether there are any parallels of long distance in the line.
(3) Check whether the Ethernet LINK indicator of VDSL Modem is normal, if not, please confirm it:
„ Check whether the connection between the PC terminal and the network cable of the VDSL
Modem.
„ Check whether the used network cables are correct or they are parallels.
„ Check whether the PC network adapter fails or is improperly configured, such as disabled.
4} Check whether the configuration of the central office terminal is correct.
„ Whether the VLAN setting is correct.
„ Whether the TAGGED mode of the upstream port is matched with the setting of the peer port.
„ Whether the negotiation between the upstream port and the peer interface is normal.
„ Confirm the consistency of data configuration between the VDSL equipment and the upper
level equipment.
(5) Fault location of the common access mode for accessing the Internet
„ Upon accessing the Internet in the PPPoE dialing mode, check the dialing status, and if the
connection between the computer and the server is shown as blocked, the physical
connection and the data configuration between the VDSL equipment and the upper level
equipment should be checked to ensure the smooth connection; if it does not pass the
authentication, the correct user name and password should be used.
„ Upon using DHCP to dynamically allocate the IP address, observe whether the subscriber can
be allocated with the IP address, if not, it shows the incorrect setting of the network adapter.
For example, the subscriber end has not been set with automatically obtaining the IP address.
„ If the subscriber can obtain the IP address and the ping the external IP address, but cannot
access the Internet yet, check whether the DNS and the setting of the proxy server are
correct.
3) Able to access the Internet but the speed is slow
„ Check the set rate and the actual activation rate of lines, if the activation rate is quite low but
the transmission distance is not so long, generally it is the problem of lines.
„
Check the result of port negotiation, and the ideal negotiation result can be achieved by
setting the related ports and the subscriber network adapter attributes of the central office
terminal.
„ Check whether the uplink of the central office terminal is connected to HUB, O/E converter
and switch, and confirm the correctness of the configuration of these devices.
1.1.1.72 Case Analysis
1) 10M network adapter is connected to Modem, the rate is quite low sometimes.
Usually, when one end of the line in duplex mode is configured as the full duplex mode and the other end is in
auto-negotiation mode, the result of the auto-negotiation is half-duplex. The different modes at the two ends
would lead to low rate.
Solution: In the case of 10/100M network adapter, two ends are configured as auto-negotiation mode, and they
can negotiate to the biggest result, that is, 100M/Full; in the case of 10M network adapter, the two ends are
configured the same mode, that is, 10M/Full or 10M/Half.