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Old 04.06.2015, 08:34
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Swisscom router doesn't recognize network switches

I just installed my router from Swisscom, the Centro Grande model. It seems to work OK if any device is connected directly to it (e.g. a computer) but if I connect a network switch to it, the switch is not recognized nor is any device connected to the switch. The indicator light on the port the line is connected doesn't even light up. I have 3 switches that I tried, and the symptom is the same for all of them. I seriously doubt that all 3 of my switches are defective. I searched the router configuration to see anything that could be causing this, but I'm not a network guy. Maybe there's something there but I don't know... This is a real pain for me, because I have some network servers that I want to install, as well as all of my AV equipment. Anyone have any advice?
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Old 04.06.2015, 08:59
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Re: Swisscom router doesn't recognize network switches

Are you using a crossover cable to connect the switch?
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Old 04.06.2015, 09:30
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Re: Swisscom router doesn't recognize network switches

Nope, just a normal cable.
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Old 04.06.2015, 10:33
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Re: Swisscom router doesn't recognize network switches

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Are you using a crossover cable to connect the switch?
modern kit normally doesn't need a crossover (as I understand it), and even if it is a crossover it'll still work.

edit: are the switches modern?
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Old 04.06.2015, 11:25
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Re: Swisscom router doesn't recognize network switches

I have Centro Grande with multiple Devolo extenders attached to it, which are essential switches, no?
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Old 04.06.2015, 12:21
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Re: Swisscom router doesn't recognize network switches

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modern kit normally doesn't need a crossover (as I understand it), and even if it is a crossover it'll still work.

edit: are the switches modern?
If modern means purchased in the last 2 or 3 years, then yes...
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Old 04.06.2015, 12:34
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Re: Swisscom router doesn't recognize network switches

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If modern means purchased in the last 2 or 3 years, then yes...
Probably I don't think I've had to use a crossover cable this century, and my kit is hardly cutting-edge
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Old 04.06.2015, 12:50
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Re: Swisscom router doesn't recognize network switches

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modern kit normally doesn't need a crossover (as I understand it), and even if it is a crossover it'll still work.
true, but it seems to fit the symptoms he is describing.

any alternative explanations or ideas?

have you tried with a different cable? maybe there is a slight fault with the one you are using?

EDIT: the only other thing I can think of is if your modem is somehow now MAC locked to the computer. maybe you can test with direct connection to a different computer and see if that works?
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Old 04.06.2015, 12:54
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Re: Swisscom router doesn't recognize network switches

Check you're not using a broken cable.

I did the same thing - subconciously kept picking up the same broken cable from the top of the pile and assuming it was the devices

Said cable was later cut into small pieces and ceremonially melted
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Old 04.06.2015, 13:19
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Re: Swisscom router doesn't recognize network switches

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Check you're not using a broken cable.

I did the same thing - subconciously kept picking up the same broken cable from the top of the pile and assuming it was the devices

Said cable was later cut into small pieces and ceremonially melted
Many years ago I was having trouble getting an old Sun box (SS20, something like that) onto the network. The connection light was coming on on the network card but I was getting zero traffic - tcpdump or whatever was showing *zilch*. After a few hours (yes, should have checked earlier ) I noticed that the cable I had picked up was RJ11 at one end and RJ45 at the other. This was clearly making enough of a connection to turn on the blinkenlights but not enough to do anything useful
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Old 04.06.2015, 14:34
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Re: Swisscom router doesn't recognize network switches

Additional information... The house is wired with two Ethernet connections in every room. The DSM router is connected to the main panel in the utility room, which is the center point of the network. My desktop computer is connected to one of the connectors in one room. It's working fine - connected directly to the wall socket. If I disconnect it from the wall, and connect to a switch, no signal is going through. I have not been able to find a working socket in the living room... I guess it's an internal wiring problem, probably the one working connector is somehow attenuated when anything else is connected and doesn't have a strong enough signal....
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Old 04.06.2015, 15:22
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Re: Swisscom router doesn't recognize network switches

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Additional information... The house is wired with two Ethernet connections in every room. The DSM router is connected to the main panel in the utility room, which is the center point of the network. My desktop computer is connected to one of the connectors in one room. It's working fine - connected directly to the wall socket. If I disconnect it from the wall, and connect to a switch, no signal is going through. I have not been able to find a working socket in the living room... I guess it's an internal wiring problem, probably the one working connector is somehow attenuated when anything else is connected and doesn't have a strong enough signal....
so if you connect the switches directly to the router (no intervening panels or cabling) and the switches are plugged into the mains they still don't work?
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Old 04.06.2015, 15:33
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Re: Swisscom router doesn't recognize network switches

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Additional information... The house is wired with two Ethernet connections in every room. The DSM router is connected to the main panel in the utility room, which is the center point of the network. My desktop computer is connected to one of the connectors in one room. It's working fine - connected directly to the wall socket. If I disconnect it from the wall, and connect to a switch, no signal is going through. I have not been able to find a working socket in the living room... I guess it's an internal wiring problem, probably the one working connector is somehow attenuated when anything else is connected and doesn't have a strong enough signal....
Are you sure it's Ethernet and not ISDN (digital telephone - as opposed to analogue telephone) sockets? The connector has the same number of pins - it's physically identical, but the wiring is not.

ISDN was quite popular a few years ago and I've seen multiple Swiss apartments wired for ISDN.

At my home I also have ISDN connectors. In order for Ethernet to work with the multiple connectors, it would require a powered switch connecting all the plugs at home at some central point - in my home the wall box at the entrance. Normal ISDN installations are wired differently, so converting from ISDN to ethernet would mean change all the cabling from the central box to the ISDN sockets.

My box has a punch down block, instead of a switch. So clearly for ISDN.
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Old 04.06.2015, 16:14
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Re: Swisscom router doesn't recognize network switches

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Are you sure it's Ethernet and not ISDN (digital telephone - as opposed to analogue telephone) sockets? The connector has the same number of pins - it's physically identical, but the wiring is not.

ISDN was quite popular a few years ago and I've seen multiple Swiss apartments wired for ISDN.

At my home I also have ISDN connectors. In order for Ethernet to work with the multiple connectors, it would require a powered switch connecting all the plugs at home at some central point - in my home the wall box at the entrance. Normal ISDN installations are wired differently, so converting from ISDN to ethernet would mean change all the cabling from the central box to the ISDN sockets.

My box has a punch down block, instead of a switch. So clearly for ISDN.
had the same in an apartment block built just a few years ago. 2 ethernet ports on the faceplate, but 1 was ethernet, the other isdn. freaking annoying. wtf uses isdn anymore?!
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Old 04.06.2015, 20:46
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Re: Swisscom router doesn't recognize network switches

OK I just got home from work... I can connect the switch directly to a router, and connect another computer to it, and it works OK. Only one of the "ethernet" plugs in the house seems to be working. I put "ethernet" in quotations because now I'm not sure what I have... Is there any conversion possible if it's indeed ISDN and not Ethernet, short of rewiring the whole house?
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Old 04.06.2015, 20:53
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Re: Swisscom router doesn't recognize network switches

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OK I just got home from work... I can connect the switch directly to a router, and connect another computer to it, and it works OK. Only one of the "ethernet" plugs in the house seems to be working. I put "ethernet" in quotations because now I'm not sure what I have... Is there any conversion possible if it's indeed ISDN and not Ethernet, short of rewiring the whole house?
Make a loop-back connector and buzz it out.
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Old 04.06.2015, 20:54
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Re: Swisscom router doesn't recognize network switches

Here are a couple of pictures, if it can be helpful...
...err the attached photos somehow became rotated. I hope nobody hurts their necks!
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swisscom-router-doesn-t-recognize-network-switches-20150604_194856-1-.jpg   swisscom-router-doesn-t-recognize-network-switches-20150604_194844-1-.jpg  
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Old 04.06.2015, 20:58
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Re: Swisscom router doesn't recognize network switches

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Here are a couple of pictures, if it can be helpful...
...err the attached photos somehow became rotated. I hope nobody hurts their necks!
If there's any sort of convention here then Yellow sockets are Ethernet and Green are phone.

That's what I've got anyway.

Where's that purple plug go?
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Old 04.06.2015, 23:03
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Re: Swisscom router doesn't recognize network switches

The purple plug is the main line into the house. It's going to the Swisscom router...
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Old 12.06.2015, 19:34
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Re: Swisscom router doesn't recognize network switches

I also have to certro grande with Netgear switches attached. Never had any problems.

Why dont you contact Swisscom support?
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I just installed my router from Swisscom, the Centro Grande model. It seems to work OK if any device is connected directly to it (e.g. a computer) but if I connect a network switch to it, the switch is not recognized nor is any device connected to the switch. The indicator light on the port the line is connected doesn't even light up. I have 3 switches that I tried, and the symptom is the same for all of them. I seriously doubt that all 3 of my switches are defective. I searched the router configuration to see anything that could be causing this, but I'm not a network guy. Maybe there's something there but I don't know... This is a real pain for me, because I have some network servers that I want to install, as well as all of my AV equipment. Anyone have any advice?
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