Thread: connecting adsl2+ modem to switch using a 12 meter long cable does not connect

Hello

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.

Thanks
NS

Please suggest if I am doing something wrong or how can I connect the Wireless ADSL2+ modems with a 12-meter long cable.

1.Please mention the modem/wifi router you use.

I need a switch because I need my other 2 PCs on wireless network too which are connected to same switch

2.12 meter long cable approx 37 feet.
Without a switch and cable
your other computers/Desktop or laptop
should work in WIFI mode. ( provided they have Wireless LAN adapters)

.For a normal WIFI router a min radius of 30 feet range is claimed .
3. Present connection : Confirm.
Wifi router==Rj45 13 meters length ==switch ( suspect)
switch ==== to other computers ( length of cables ?)

Originally Posted by essbebe

1.Please mention the modem/wifi router you use.



2.12 meter long cable approx 37 feet.
Without a switch and cable
your other computers/Desktop or laptop
should work in WIFI mode. ( provided they have Wireless LAN adapters)

.For a normal WIFI router a min radius of 30 feet range is claimed .
3. Present connection : Confirm.
Wifi router==Rj45 13 meters length ==switch ( suspect)
switch ==== to other computers ( length of cables ?)

I am intrigued by the queer nature of the original post

Ethernet cabling can comfortably work upto 100 mts, although losses may begin by 60 mts. The speeds are also restricted by 10baseT, 100baseT and 1000baseT.

@ nsdataone, have u tried connecting a hub instead of a switch?

After reading your post/s in
connecting adsl2+ modem to switch

Home Network Diagrams - Ethernet Hub / Switch

Limitations - All computers connecting to a hub or switch must possess a working Ethernet network adapter.

As shown, unlike a network router, Ethernet hubs and switches cannot interface directly to an Internet connection. Instead, one computer must be designated as controlling the Internet connection and all other computers access the Internet through it. Internet connection sharing software can be installed on each computer for this purpose.

ICS can be implemented in the following case :

The modem has only one output port (Ethernet or USB)
There is more than one PC in which the internet is a necessity

The disadvantage of ICS is that the PC configured as the server should remain online at all times. A better option would be to invest on a switch/router.

I guess we all are deviating from the problem at hand..

Originally Posted by cool_techie_tvm

@ nsdataone, have u tried connecting a hub instead of a switch?

Yes, I did try a very old Hub but that failed again and also I had to connect using cross cable for hub to work in short cable too.

Here is the detail of my ADSL2+ modems and connections etc.

I am having 2 ADSL connections (I need to have one backup connection all the time as per demand of my online business, so having 2 separate broadband connections).

One main connection (192.168.1.1) is of BSNL 8 mbps and I use TP-Link 8810 single port modem for it. This is a wired modem and the only modem I found that remains stable on 8 mbps link and gives full 8 mbps download and 1 mbps upload speed. Any other modem, always had SNR issues.

Second ADSL connection (192.168.1.2) is 2 mbps connection of HFCL Connect, connected by a wired modem again. Do not know the make of this modem as it has a big sticker over it covering its name etc. but board ID shows it as 96338L-2M-8M. Single port modem again. Very stable connection again. I just attached screen shot of Modem's interface with a small pic of Modem. I think it is Atrie DB108 ADSL2+ model though their site shows a different photo for same model.

Both these modems are connected to a D-Link Switch DES1008D (just 1 feet long cable in both).

Switch has 3 other PCs (192.168.1.101, 102, 103) connected to it, within same room. Cable lengths between each PC and switch is avg. 10 feet.

All IPs are static, no DHCP. Both BSNL and HFCL Connect internets are available on all 3 PCs without any trouble and all 3 PCs connect to each other too very well. I keep both modems on all the time and when I need to switch from one modem to other on any PC, I simply change the gateway and DNS in my local area network setting in that PC. I use NetSetMan freeware to keep on switching between 2 internets (NetSetMan changes the IP and DNS and Gateway quickly with shortcuts).

All these connections work perfectly without any issue or signal losses.

Now I am having a new wireless modem from BSNL WA1003A (192.168.1.3) and I want to use this one as Access Point (AP) only, to spread the internet of BSNL and HFCL to my laptop and mobile phone. If I connect this WA1003A to switch using a small cable and use this wireless modem as AP, it works perfectly. I can access wireless on my laptop and mobile.

No problem as of yet.

Now problem only comes when I increase the length of the cable to around 12 meter (around 35 feet or so) that connects WA1003A to Switch. With 8-port switch it fails to ping at all, tried another 8-port switch of Intex, that failed too and then I tried 16-port switch of a friend that is gigabyte switch, then it works. To experiment, I replaced the WA1003A, with my other TP-Link and HFCL Connect modems just to see the connectivity, but all gave same results. With short cables they all work, but with long cable, they all fail and in switch, the light for long cable is not stable, it blinks. Note that error is not just with WA1003A, I tried connecting all modems with long cable, but light never was stable using 8-port. Same device, same port on 8-port switch, but with short cable, all becomes stable and light is stable too. For long cable, all this goes stable only if I put 16-port switch.

By the way, you may ask, why I am putting the wireless modem 12 meters away from my switch. All my PCs and both modems are at ground floor in a closed room and I need to access wireless internet on my 2nd and 3rd floors. If I keep wireless modem at ground floor, signal is too weak on upper floors to get connected and in some rooms just no signal. I tried D-Link Access Points, and also tried other TP-Link TD8910G wireless modem hoping for better signal on upper floors, but all gave same weak signal. Obviously due to wireless transmitter lying on ground floor (which is always suggested to put as high as you can) and so many RC walls in-between. If I put the wireless device on my upper floor, signal remains more than 70% on top floor and ground floor as well and in all rooms too.

Hope I have made my connections etc. clear in this post, not confusing them.

Thanks
NS

@cool_techie_TVM

I guess we all are deviating from the problem at hand.

see latest post !


@nsdataone

but board ID shows it as 96338L-2M-8M. Single port modem again.

This is common to many ADSl modems. beetel220Bx
beetel110Bx1 Utstar 300r2u etc.
Post screenshot of Device status page.
Only for Info. .Not for solving your problem.!!!

@cool_techie_tvm
will take over the thread.
Interesting/unusual setup.

Additional Info:
For Using two ISPs : Dual wan Load balancing router/s
D-Link Product Categories

Originally Posted by essbebe

@cool_techie_TVM

Post screenshot of Device status page.
Only for Info. .Not for solving your problem.!!!

[/url]

I just updated my post with screenshot. Also even if we interchange the modems, scene remains the same.. They all connect with short length and they all fail with long length.

Thanks

Originally Posted by nsdataone

Hello

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.

Thanks
NS

Take the wire to retailer check the connectivity. If the wire is ok the problem is with crimbing. Crimb with parrallel connection with good quality rj45 connecter. The problem will be surely solved

Wireless ADSL2+ modem to an 8-port D-Link DES1008D switch.........
But if I use a long CAT5 cable of around 12 meters, then it does not connect at all.

Ignore please go to para two and three .
==================================

if I connect the same Wireless ADSL2+ modem directly to my computer without any switch in-between using same cable, then it works..........

1..Means your settings for LAN/ethernet port is OK.

2.... Now try the laptop/s in lan mode
........at same location.
3......Again try the laptops in wif Mode at same location.
( or within a short distance of say 20 feet radius)

4. Now the switch part.
you connect the LANRj45 cable from modem
to the switch. ( any length of cable )

5. connect Desktop ( short cable)

6. ( From switch)Use another rj45 ( say 12 meters) to connect to
ethernet port of Laptop 1 and Laptop2

6. Use only one ISP/one modem/WA1003A connection. with the switch.
==============================
Para two: this problem is pending since contest period, more than a month.
Unable to understand the problem still.
How two isp's output
are connected to switch, and you say working perfectly.
[quote]

Para three:

Both these modems are connected to a D-Link Switch DES1008D (just 1 feet long cable in both).
All IPs are static, no DHCP. Both BSNL and HFCL Connect internets are available on all 3 PCs without any trouble and all 3 PCs connect to each other too very well. I keep both modems on all the time and when I need to switch from one modem to other on any PC, I simply change the gateway and DNS in my local area network setting in that PC. I use NetSetMan freeware to keep on switching between 2 internets (NetSetMan changes the IP and DNS and Gateway quickly with shortcuts).

Two isp's /two modems/ to the switch ?
meaning
the Switch works like costlier DualWAN port units.
and output to three computers.
Now WIFI modem being tried?
Explain please.

I need a switch because I need my other 2 PCs on wireless network too which are connected to same switch

Now the switch should act like a wireless access point ?