DS3 comming, what do I need?
I have a ds3 being installed in about 3 weeks and so far i'm at a loss as to what hardware I need for sure. So far the carrier has told me its being delivered via coax. I have the NM-T3 but am unsure what else I need to get to connect to the Coax from the carrier. Will I have a smart jack like device that I attach to? Or does the carrier bring the coax to me?
Thanks to all who might know what to expect! =)
White City, OR
They will probably bring in some form of fiber to the building to a CPE device that will terminate to coax. It will need power so make sure you have a UPS/UPS circuit near the demark.
We are going to be installing a DS3 at our location to an MPLS network in around 120 days.
|reply to MrMcDuck |
You should match up the following with your ISP since this is a ATM circuit.
1) VPI/VCI numbers
2) AIS and RDI
3) If you will use OAM
5) ATM cell scrambling On/Off
6) Clock source should be line, this is default.
Also with this type of module they have a sensitive RX receiver for the clocking. If you notice lots of errors,etc the LEC/ISP needs to check and lower something called LBO ( line build out ) If they say they cant you can use a hardware attenuation to lower the incoming -db.
I got 3x DS3 and 1x OC3 going in next month. So I have seen this issues pop up a few times
"Knowledge is contagious, infect"
|reply to yaplej |
The location is 12 miles from the CO. Qwe$t is going to bury the line to me, about 3 to 5 miles from the remote co "if thats what you call it" All I have been told though is that it will terminate with Coax. I'm not far from you "yapelj", but I don't think they are going to bring fiber out here, though I don't know for certain. I'm not that up to speed on the DS3 stuff yet. =)
Thanks for the responses guys!
DanLanManOne Man, Many Mysteries
At one of our properties we have a DS3 line into head-end communications room. AT&T installed it. Its in it own rack with a battery backup and voltage regulator.
It comes into the building on fiber and then terminates to their box in the rack and from there a pair of coax wires to our router. we have a 3662 with the DS3 connected to an ATM interface card.
you need all the info rizacerx suggested, but AT&T provide all of that once the circuit was up and we were setting up our router. Currently the DS3 on that property is 30 megs but we are going to be upgrading to 45 megs in a couple months.
I didn't see in the initial description, if this was
a straight DS-3 or if if it was ATM. If it's
a straight DS-3 you'll should be pretty much set
but you might have to see if you're getting it channelized
or full. We have a mix of both. A non-channelized
is the easiest, to configure, you toss on the interface a
"no channelized" command and it does just that. Makes
it one huge pipe.
If you do see errors, as someone else had mentioned
you can get the Telco to adjust the line, or you can
do what we did. We used attenuators to tone down
the hot signals.
|reply to MrMcDuck |
T3 came, my nm-1a-t3 is no good.... =(
I have to get a quick replacement, but the budget can't fit the price of another nm-t3.
Anyone have any suggestions? On ebay I see lots of the 7200 non vxr for pretty fair prices and the pa-t3 is pretty inexpensive. Any reason I should not do this?
It should not hurt when you have more powerful gear.
However what brought you to the conclusion that your NM-1A-T3 was no good?
|reply to MrMcDuck |
Is this an Internet circuit? I assume there is no BGP involved on your router. You could probably get away with a 7200 with the PA-T3 but depending on the NPE version you may be limited as to what IOS releases you can run and the amount of features you can configure and still maintain acceptable throughput.
Once you start getting into the higher end gear with Cisco you run the risk of getting burned. There are a LOT of caveats with modules and chassis compatibility and capability depending on IOS version and configured feature sets. It is not as cookie cutter as you may think.
Ignorance is temporary...stupidity lasts forever!
in the initial post I didn't see if the DS3 was a straight
or ATM DS3. The PA-T3 rolande mentioned, is different
than the NM-1A-T3. Besides being a module for a 37xx/38xx
router, its an ATM adapter. Although, if it's an
ISP terminating the DS3, there's more of a chance
it's going to be ATM.
My situation is a little different, as one end
of the DS3 is at my server/router/switch configuration
center, and the other end is terminated at the
super computer center on the campus of OSU.
When have both ends, and are running a single
DS3 pipe (via the
controller T3 1/0
controller T3 1/1
the crazy part is, I'm waiting for my NM-T3 to arrive
so in the mean time I've had to front end my c3845
with a c7206xvr with a PA-2CT3+. The fun part is
once the NM-T3 comes in, I have to make sure it works
with the IOS that I'm running in the c3845. At the
moment, it's a 12.4 T train since I'm running a
NM-AIR-WLC6-K9 in the c3845 to control the AP1231's
that we use for inventory control and configuration in
our warehouse portion of the the test and configuration