Most likely, there is some type of controller in slot 3/0. A channel group is set up on this controller. If the facility coming into the controller is down, any channel groups (serial interfaces)built on the controller will be shown as "reset". If the controller is a T1 interface, enter the command "show controller t1 3/0" and check the status of the T1.
yup. the serial interface was down all right. the telco was testing the loopback, what i was told.
Wanna to ask i have my router's leased line bouncing, once it was down @ midnight and it went back up during just before commencement of work. could you pls advise, what could be done with a bouncing leased line! Co-ordinate with telco and it says that their connection was fine.
See if power is brought down at one site or the other. I've heard of situations where management or landlords cut of power during non-business hours to save a couple cents. In the routers at each end, do a "show version" command and see how long it has been since the router was power-cycled.
Do a SHOW CONTROLLER and look for the stats for ES (Errored Seconds) SES (Severely Errored Seconds), CRC errors, frame slips, clock slips, etc.
Check to see that the clock source is set to line, not internal (if you're connected to a Telco).
Clock slips can cause the random resets when the clocks eventually fall out-of-sync. The Telco network is (usually) the best source of clock, since they are operating on a (very precise) Stratum 1 clock.
If you're getting a lot of random errors (ES,SES,CRC,Frame slip, etc), then also check your cabling from the SmartJack (and/or SmartJack to the "Extended Demarc" - the link from where you actually plug the device in to where the Telco's SmartJack is actually located).
UTP / Cat5,5e,6 is actually NOT rated for T1 use, though most systems will tolerate it. In very long runs from the SmartJack / Extended Demarc, the signal can degrade with external noise or crosstalk.
"Real" T1 cable ("Premesis cabling") has each pair shielded, with an overall shield in the jacket (which must be properly grounded/terminated to be effective).
Depending on what the physical interface is (T1/E1 or PRI ISDN) the controller may have the capability to amplify or attenuate the signal (Cablelength short/long gain26/gain36 -0 -7.5 -22 ...).
Or are you using a serial interface to a CSU/DSU?
What is the physical interface? What kind of errors are you seeing (if any) at the controller level?
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