Thanks to all of you who have responded. Here's where I'm at: The Telco's (two telcos involved) have both said the circuit is sound and correct. We can loopback both ways down the length of the circuit and it works ok. To eliminate hardware problems on my end, I have tested this router and DSU on the T1 in my office. It is a point to point to our ISP. The router came up, I plugged in our IP's, NAT, ACL info and we were surfing. My hardware/configuration seems to be working ok. The only thing left is their hardware/configuration, so I feel that's where the problem lies. The company I am trying to connect to has over 50 T1's going into their facility - this is not exactly a new configuration for them.
Admittedly I am not the most seasoned field person. I have installed some T1's, but not 100's. I feel I must be missing something simple, but I don't what it is. The default configuration for this DSU is: clock source - line encoding - b8za framing - esf timeslots/channels - all 24 speed - 64k I have not modified any of these settings execpt changing the clock source, trying it both ways. In our office I know the ISP is providing the timing, so I just left everyting on the DSU to default and it worked beautifully. Any other ideas? Thanks, Stephen Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=22068&t=22068 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]