Voice interface must be shutdown before updating
Give below commands- Router(config)#controller e1 0/0/0 Router(config-controller)#no pri-group timeslots 1-31 If the above command is accepted, then ok. Router(config-controller)#no pri-group timeslots 1-31 %controller must be shutdown before unconfiguring pri-group to gracefully bring down isdn.
Router(config-controller)#shutdown Step 10- Shutting down the voice interface.
If it's showing, then the card is assumed to be ok. From Router# prompt give command- show run and gather few information shown in below picture.
A longer distance from the device to the repeater requires that the signal strength on the circuit be boosted to compensate for loss over that distance.
Layer 1 can be SHUTDOWN due to few reasons- 1) Card is faulty 2) Signaling or keepalives not being received from ISP side 3) wrong configuration 4) Ethernet cable not connected 5) Interface is administratively down. From Router# prompt give command- show controller e1 0/0/0 and check status up/down. Peel plastic cover of above pins and short copper wires together.
Notice in line number 7, Framing is NO-CRC4 and Line Code is HDB3. Short pin 1 and 4 together and pin 2 and 5 together.
These values are generally ISP provided and cause line down if mismatch. Also check if controller, serial interface, voice port is administratively down. Bend slightly outward to avoid short circuit between this two couplings.
Step 9- Now for loopback test we'll look at the running-config. In our case, card type e1 0 0 (means e1 card, slot 0 and subslot 0), controller e1 0/0/0 (same as card type,device/slot/subslot), interface Serial0/0/ (it's virtual serial interface for communication), voice-port 0/0/ (voice ports).