View source for Cisco Back-to-Back T1 Interface Configuration

=Background Information=
{| {{table}}
| align="center" style="background:#f0f0f0;"|'''Step'''
| align="center" style="background:#f0f0f0;"|'''Instruction'''
| align="center" style="background:#f0f0f0;"|'''Command'''
| align="center" style="background:#f0f0f0;"|'''Example'''
|-
| 1||Set the card to T1 mode||card type t1 ''slot subslot''||card type t1 0 0
|-
| 2a||Set the clock source to internal (on each DCE port)||controller t1 ''slot/subslot/port''<br> clock source internal||controller t1 0/0/0<br> clock source internal
|-
| 2b||Set the clock source to line (on each DTE port)||controller t1 ''slot/subslot/port''<br> clock source line||controller t1 0/0/1<br> clock source line
|-
| 3||Set the channel group 0 to include all 24 T1 timeslots||controller t1 ''slot/subslot/port''<br> channel-group 0 timeslots 1-24||controller t1 0/0/0<br> channel-group 0 timeslots 1-24
|-
| 4||Set the port framing to esf||controller t1 ''slot/subslot/port''<br> framing esf||controller t1 0/0/0<br> framing esf
|-
| 5||Set the linecode to b8zs||controller t1 ''slot/subslot/port''<br> linecode b8zs||controller t1 0/0/0<br> linecode b8zs
|}
You should now have a Serial0/0/0:0 interface and/or Serial0/0/1:0 interface which you can assign an IP address to and use as with any normal serial interface, make sure to include the :0 on the end of the interface though.

'''Note: You need to adjust multiple lines of this configuration for the correct slot numbering on the router you are working on. In particular our 1900 series routers have serial cards in slot 0 subslot 0 and our 4000 series routers have cards in slot 0 subslot 1.'''
=Sample Two Card Configuration=
'''Note: You need to adjust multiple lines of this configuration for the correct slot numbering on the router you are working on. In particular our 1900 series routers have serial cards in s0/0 and our 4000 series routers have cards in s0/1.'''

==DCE IS S/0/0/0 AND DTE IS S0/0/1==

 card type t1 0 0
 controller t1 0/0/0
 clock source internal
 chan 0 time 1-24
 framing esf
 linecode b8zs
 controller t1 0/0/1
 clock source line
 chan 0 time 1-24
 framing esf
 linecode b8zs

==DTE IS S0/0/0 AND DCE IS S0/0/1==

 card type t1 0 0
 controller t1 0/0/0
 clock source line
 chan 0 time 1-24
 framing esf
 linecode b8zs
 controller t1 0/0/1
 clock source internal
 chan 0 time 1-24
 framing esf
 linecode b8zs

==DCE IS S0/1/0 AND DTE IS S0/1/1==

 card type t1 0 1
 controller t1 0/1/0
 clock source internal
 chan 0 time 1-24
 framing esf
 linecode b8zs
 controller t1 0/1/1
 clock source line
 chan 0 time 1-24
 framing esf
 linecode b8zs

==DTE IS S0/1/0 AND DCE IS S0/1/1==

 card type t1 0 1
 controller t1 0/1/0
 clock source line
 chan 0 time 1-24
 framing esf
 linecode b8zs
 controller t1 0/1/1
 clock source internal
 chan 0 time 1-24
 framing esf
 linecode b8zs