connecting t1 to cisco mc3810

>I configure the serial 0 interface but i am not connecting any cable to it

If the interface it not connected then it's not going to be functional.

You also need to define your timeslots

controller t1 0
 channel-group 0 timeslots 1-24

And you've got an access-list on serial 0 that doesn't exist.

i get this error message can you help

1w0d: %SYS-5-CONFIG_I: Configured from console by console
1w0d: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0:0, changed state t
o down
1w0d: %LINK-3-UPDOWN: Interface Serial0:0, changed state to up
1w0d: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0:0, changed state t
o up
1w0d: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0:0, changed state t
o down
1w0d: %LINK-3-UPDOWN: Interface Serial0:0, changed state to up
1w0d: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0:0, changed state t
o up
1w0d: %PQUICC_ETHER-1-LOSTCARR: Unit 0, lost carrier. Transceiver problem?
OMGBTN-RTR#
OMGBTN-RTR#
OMGBTN-RTR#
1w0d: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0:0, changed state t
o down
1w0d: %LINK-3-UPDOWN: Interface Serial0:0, changed state to up
1w0d: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0:0, changed state t
o up

Please post your current config and the output of a "show int s0".

config file

urrent configuration : 867 bytes
!
version 12.2
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname OMGBTN-RTR
!
no logging console
!
network-clock base-rate 56k
ip subnet-zero
no ip domain-lookup
!
!
controller T1 0
 framing esf
 clock source internal
 linecode b8zs
 channel-group 0 timeslots 1-24 speed 64
 loop-detect
controller T1 1
 framing sf
 linecode ami
!
!
!
interface Ethernet0
 description connection to LAN
 ip address 12.48.121.17 255.255.255.248
 no ip redirects
 no ip unreachables
 no ip proxy-arp
 no ip route-cache
 no ip mroute-cache
!
interface Serial0
 ip address 12.91.8.78 255.255.255.252
 encapsulation ppp
!
interface Serial1
 no ip address
 shutdown
ip address 12.91.8.78 255.255.255.252
 encapsulation ppp
!
interface Serial1
 no ip address
 shutdown
!
interface Serial0:0
 no ip address
!
ip classless
ip route 0.0.0.0 0.0.0.0 12.91.8.77
no ip http server
!
!
line con 0
line aux 0
line 2 3
line vty 0 4
 login
!
end

show int s0

Serial0 is down, line protocol is down
  Hardware is PQUICC Serial
  Internet address is 12.91.8.78/30
  MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation PPP, crc 16, loopback not set
  Keepalive set (10 sec)
  Scramble enabled
  LCP Closed
  Closed: IPCP, CDPCP
  Last input never, output never, output hang never
  Last clearing of "show interface" counters 1w0d
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: weighted fair
  Output queue: 0/1000/64/0 (size/max total/threshold/drops)
     Conversations  0/0/256 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
     Available Bandwidth 1158 kilobits/sec
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     0 packets input, 0 bytes, 0 no buffer
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
 --More--
Closed: IPCP, CDPCP
  Last input never, output never, output hang never
  Last clearing of "show interface" counters 1w0d
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: weighted fair
  Output queue: 0/1000/64/0 (size/max total/threshold/drops)
     Conversations  0/0/256 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
     Available Bandwidth 1158 kilobits/sec
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     0 packets input, 0 bytes, 0 no buffer
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     0 packets output, 0 bytes, 0 underruns
     0 output errors, 0 collisions, 1 interface resets
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions
  Cable attached: No cable
  Hardware config: No cable; DTE;  DSR = DOWN   DTR = DOWN   RTS = DOWN   CTS =
DOWN   DCD = DOWN

Third to the last line says it all:

"Cable attached: No cable"

You've either got a bad cable, bad circuit or nothing plugged in.

i thought i don't need a cable to the serial 0 port because controller t1 0 is a physical interface that the connection terminates....i don't know where to connect the serial cable to if i need to...please advice

The T1 interface is a serial connection. Don't you have a "T1" port on the router?

i connect the cable from the t1 box to the t1 port.

Do the LED's for the T-1 port indicate any faults?

the led for the t1 is sold green....

Please post the output of a "show ip int brief".

the router is at my work...i will post when i get there..thanks

show ip int brief

Interface                  IP-Address      OK? Method Status                Prot
ocol
Ethernet0                  12.48.121.17    YES NVRAM  up                    up

Serial0                    12.91.8.78      YES NVRAM  down                  down

Serial1                    unassigned      YES NVRAM  administratively down down

Serial0:0                  unassigned      YES manual administratively down down

please advice......

I'm assuming that 12.91.8.78 is the address you want for the T1?

If so, here's what you need to do:

int s0 
 no ip address
int s0:0
 ip address 12.91.8.78 255.255.255.252
 encap ppp
 no shut

Select allOpen in new window

the router seems to be working fine..the thing now is i can't get on the internet yet....sorry if i miss anything...do i need to connect it to a switch?

Is the serial 0:0 interface up/up?

Can you ping 12.91.8.77?

yes

sorry here is the result of the show ip route again....

MGBTN-RTR#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route

Gateway of last resort is 0.0.0.0 to network 0.0.0.0

     12.0.0.0/8 is variably subnetted, 3 subnets, 3 masks
C       12.91.8.77/32 is directly connected, Serial0:0
C       12.91.8.76/30 is directly connected, Serial0:0
C       12.48.121.16/29 is directly connected, Ethernet0
S*   0.0.0.0/0 is directly connected, Serial0:0
               [1/0] via 12.91.8.77
OMGBTN-RTR#

I think i got it now...thanks for all the help ....couldn't of done it without you...