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If the Serial cable is working fine, what is the next step to troubleshooting a T1 or leased line?
Use debug command to check errors.
Check controller counters.
Verify CSU/DSU settings.
Use an extended PING to check connectivity.
Any troubleshooting procedure must follow a bottom-top layered approach. The first layer to be checked is the Layer 1 then Layer 2, so on until reaching Layer 7. In this case, to troubleshoot a leased line or a T1 verify the cable, then the CSU/DSU settings (Speed, Clocking, Framing, etc).
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