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Connecting T1 modem to another hub

R

Ramma2

Platinum Member
I'm working with a T1 modem here, and I'm trying to get it connected to a 24 port hub on the other side of the building.

The modem has 8 ports on the back. 1 is a selectable uplink port. On the other side of the building is an Intel 24 port hub, with 1 port either a "daisy chain" or port 1. Between these 2 devices is just a single line.

How do I set these up so that the PCs on the hub side can connect through the modem? I've tried having the modem in uplink, then the hub in uplink, but I get no response through the modem this way. What am I doing wrong?

Edit: Looked it up, its actually a T1 router
 
T1's don't typically have "modems". They plug into routers with a CSU/DSU card and then typically get plugged into a firewall and *THEN* into your network hub/switch.

It's look like this: Provider ----> T1 circuit mounted on wall by demark ------> router ------> firewall -----> hub/switch

DSL lines will have a modem though.

Are you certain you are using a T1?
 
Just saw your edit.

Okay. Do you have a firewall device in place providing NAT for the rest of the PC's?

Typically the T1 router will not be set up for that purpose.
 
Not sure on the NAT status, but here is what I've come up with.

The manual for the router says to connect a hub to the uplink port on the router. Got that setup. But my machine gets no internet connectivity through the hub.

If I plug in my PC directly to a port on the router, I can set the IP addresses and it works fine.

There is no firewall through this connection that I'm trying to setup. We have a primary connection controlled by a Cisco firewall. This is a second internet connection I'm trying to setup that is isolated from our main one.
 
I'm certainly not an expert on these things, there are people here with a lot more experience than I have, but I'd *personally* put another NAT device on that seperate network you are wanting to run.

It would look like this:

T1 router - hub - cisco firewall - Lan 1
........................- nat device 2 - Lan 2

Even if it's just a little $30 consumer level Cable/DSL router, I'd run a drop to it from the router, configure it with the DFGW, Subnet, and a spare Static IP assigned from your ISP and then let it hand out DHCP leases and run the NAT for you.

Again, I'm certainly not an expert so others may have better suggestions.
 
vi_edit is correct, a Hub is just a layer 1 device that basically sends all signals to everyone that is connected. You need a switch with NAT that will manage connection to the router. Unless of course the T1 router already has NAT functionality.
Also they might be calling it a T1 router, but it is probably just a CSU/DSU. If they are calling it a router, it may have NAT.
 
It must have NAT enabled for the primary network, but its not something that I would need on this secondary network, since there would be only 2 PCs and each would have their own direct to net IP address.

It turns out that the router only supports 10baseT connections. Since the hub supports 100bt and my nic supports 100bt, it wasn't talking correctly. Once I set my nic to 10bt it fired right up.

Thanks for the help guys!
 
BTW, one of the big draws (and one of the reasons why its usually more expensive) of a T1 is usually its service and support and uptime (considering that the slow 1.5mbit speed of it is often beat by the common 3mbit dsl or cable, at least in terms of download). Why weren't you able to contact the ISP?
 
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