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Thread: connecting adsl2+ modem to switch using a 12 meter long cabl

  1. #1
    Junior Member
    Join Date
    Feb 2009

    connecting adsl2+ modem to switch using a 12 meter long cabl


    I am having a strange problem connecting Wireless ADSL2+ modem to an 8-port D-Link DES1008D switch. If I connect the Wireless ADSL2+ modem to my 8-port switch with a short 1-meter long CAT5 cable, then it works well without any problem. No losses shown on ping (no losses even with 65500 packets, using ping l 65500 command). But if I use a long CAT5 cable of around 12 meters, then it does not connect at all. Light on the 8-port switch is not stable and it keeps on blinking and ping just totally fails. I tried changing cable too using CAT6 (assuming that first CAT5 cable may be defective) and then I even used another 8-port switch (one of same D-Link model and one other of Intex make) but no difference, same error. I also tried 4 different ADSL2+ modems (2 wired and 2 wireless) but same error on all of them.

    Now strangely, if I connect the same Wireless ADSL2+ modem directly to my computer without any switch in-between using same cable, then it works. I even joined both the cables to make it a total of around 25-meter length, then also it worked without any losses. Means without switch, no length issues while connecting Wireless ADSL2+ modems to PC.

    I tried using straight and crossover cables but same results. Switch is unmanaged so it is supposed to handle both types of cables but still I tried just to be sure.

    Now one more thing, I replaced 8-port D-Link DES1008D switch with a 16-port D-Link DGS1016D switch, then it worked. So it means, that 8-port switches cannot be used to connect Wireless ADSL2+ modems for long lengths? Also 16-port switch is a Gigabit switch as compared to 8-port 10/100M switch so that will make any difference on this scheme? If so, then very strange because 8-port D-Link DES1008D switches connect 2 PCs over up to 90-100 meters then why not take the Wireless ADSL2+ modems to just 12 meters?

    All my IP addresses are static; I am not using any DHCP in any hardware.

    Please suggest if I am doing something wrong or how can I connect the Wireless ADSL2+ modems with a 12-meter long cable. I need a switch because I need my other 2 PCs on wireless network too which are connected to same switch. I do not want to invest into a new 16-port switch (which connects it) because just for 3 PCs having a 16-port switch at home is not a wise option.

    Kindly suggest.


  2. #2
    Administrator Philip's Avatar
    Join Date
    May 1999
    Jacksonville, Florida, United States
    Blog Entries
    Is it possible that the 12m cable run is near some source of EMI, that something interferes with the signal ? Fluorescent lighting, power adapters/cables can all possibly create problems.

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