Point to Point T1

This should get you on the right track....although may need to get your provider involved depending on the possible issue.

How about a looksie at the configuration of the routers?

Do you use a normal STRAIGHT cable to connect to demarc? When you connect to demarc smart jack (RJ45 jack, assigned by your Telco provider), you should use a normal Ethernet cable, not T1 crossover. Another thing is - not every Ethernet patchcord will work. I experienced it a couple times, when one Ethernet cable works with T1, and another doesn't . I had no time to check them with a cable tester, but it's another thing you should check. And from the practical standpoint, it's better to bring your router right next to T1 Demarc, and connect it. In this case you will see both lights - router's and provider's.

Good luck,

Mike CCNP, CCDP, CCSP, Cisco Voice, MCSE W2K, MCSE+I, Security+, etc. CCIE R&S (in progress), CCIE Voice (in progress)

------ Headset Adapters for Cisco IP Phones

Okay, so I think I am starting to head in the right direction. So I discovered today that my point to point t1 is just an open pipe between me and the co-lo. So as I understand it, I just need the line coding from the telco, the rest I provide. So I can choose my own encapsulation right? Also I need to set a master and slave clockrate?

I have the t1 controller at my location cofiged as follows

controller T1 0/1/1 framing esf clock source internal linecode b8zs channel-group 0 timeslots 1-24

Here is the serial interface

interface Serial0/1/1:0 description corp ip address 10.0.0.1 255.255.255.252 encapsulation ppp no cdp enable

As of right now my equp at the co-lo is down. We will be bringing it up shortly. So I should be able to just config the other serial interface at the colo as follows

interface Serial0/1/1:0 description co-lo ip address 10.0.0.2 255.255.255.252 encapsulation ppp no cdp enable

Now, like I said before when I had both routers here. I was able to connect the via a t1 cross over cable and get sync and ping each others ethernet interface accross the t1 link. So I am assuming with the info I have gotten from the telco that I just need to provide the clocking.

Is any of this making sense?

Pretty much. When you connect the co-lo check "show controllers t1" to see that there are no alarms present on the T1s. Assuming no alarms, your serial interfaces should change to line up/protocol up and you're away.

If you see slip seconds on the co-lo end it indicates a clocking issue and then you might try clock source line at both ends just in case the telco is clocking the circuit.

For some reason T1 controllers default to 56kbps timeslots. Have a look at show interface, and if it says the bandwidth (BW) is 1344kbps instead of

1536kbps you will need to reconfigure your channel groups at both ends, adding "speed 64" to make full use of the link.

You will have to remove and recreate the channel groups and reconfigure serial interfaces to make that change if it's necessary.