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Setting up a T1 with DSU/CSU.. need help!


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ljzmcm ljzmcm is offline
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01-Aug-2008, 02:19 PM #1
Setting up a T1 with DSU/CSU.. need help!
Okay,

So I got a T1 connection delivered to an office. They set it up with an old DSU/CSU box (modem) and input the settings. I now have purchased an 8-port VPN Linksys router.

I pretty much have no idea what to do from here on out. The T1 provider (Sprint) gave me my IP to input into the DSU/CSU box, which I did through Hyperterminal.

Any experts wanna help me with this?

Thanks
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01-Aug-2008, 03:21 PM #2
You need a router with an HDLC interface or integrated CSU/DSU.

CSU and DSU are layer1/2 devices. They simply take TDM channels at a mux/demux level. They have no knowledge of IP's/routing/gateways/etc. (Even though it may have an Ethernet interface, it's for management only or bridging at best)
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01-Aug-2008, 03:31 PM #3
http://www.newegg.com/Product/Produc...82E16833124160

I have this model. Cant seem to find out if it has HDLC... do you know?

Thanks
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01-Aug-2008, 03:33 PM #4
I see that this one:

http://www.pcconnection.com/IPA/Shop...htm?sku=472013

Has it and the price jump is huge... I'm confused...
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01-Aug-2008, 06:00 PM #5
Anyone? Thanks
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02-Aug-2008, 12:44 AM #6
If you're purchasing from NewEgg, purchase this.

http://www.newegg.com/Product/Produc...82E16833120087

Integrated CSU, will terminate that circuit for you, firewall, etc.

Any reason you purchasing a T1, and not some form of broadband connection?
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02-Aug-2008, 12:57 AM #7
I already have the DSU CSU unit installed.

I have to have T1 because its on military property, and broadband companies out here wont lay cable to them.

Theyre really this expensive? Wow
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02-Aug-2008, 01:37 AM #8
Can you describe more about this modem you received? Does this modem have an ethernet port on it along with the T1 port?
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02-Aug-2008, 12:38 PM #9
Ahh, I see.

What model CSU is it? Can you take a pic of the front/back?

Or: http://cgi.ebay.com/Used-Cisco-2611-...QQcmdZViewItem
and cable to configure:
http://cgi.ebay.com/NEW-Cisco-Consol...QQcmdZViewItem

You can find an old router on eBay, hook it up. You'll need computer with serial port to configure.

I can help you with config.

With the router, you'll have integrated CSU and routed connection to Ethernet port. Hopefully your ISP gave you a "LAN" range. With the LAN side, you plug in the "WAN/external" port of the LInksys firewall, then your computer(s) into the firewall.

This will give you a serviceable network connection.
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02-Aug-2008, 07:37 PM #10
I'll have to get back to you on Monday when I'm back at the office.

It's an ADC Campus-RS, but I'm not sure what kind of interface card is in it.

http://www.adc.com/Library/Literature/100005.pdf

Looks similar to that one.



So to verify... standard router wont work for this?


Thanks a bunch, you've been super helpful
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02-Aug-2008, 09:06 PM #11
If that's the one and your modem is indeed a modem acting as a bridge, all you need is to plug your router into the ethernet port on that modem and assign your static IP to your Linksys router.

The reason I started down this path was my company as T1 service too and a modem was provided to us with an ethernet connection. Since we have 5 statics as part of our service, I just simply wired a small switch to the modem and allowed the various servers and network devices we wanted on the internet.

The previous guy who was sort of put in charge of the company network made an assumption he also needed a router with a T1 CSU/DSU. The company purchased a Cisco 1841 with a T1 HWIC card which is now pretty useless because the ISP provided us with a modem negating the need for the router.
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03-Aug-2008, 12:37 PM #12
Haha geez, I'm glad I cleared that up before I dropped a grand on a CSU router.

I'll find out for certain on Monday.

Thanks
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