Hi All!

Есть cisco1841 с модулем WIC-1T подключенная по V35 к провайдерскому Keymile UMUX 1500. Интерфейс поднимается, а вот line protocol почему-то down :( И при этом на UMUX горит красная лампочка аварии. А вот если к этому же UMUX подключаю cisco805 все заводится с полоборота, все аварии отбиваются, и интерфейс и line protocol up.
Конфиги практически одинаковые:
cisco 1841:
Router#sh run
Building configuration...

Current configuration : 841 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname Router
!
boot-start-marker
boot-end-marker
!
no aaa new-model
!
resource policy
!
mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180
ip subnet-zero
ip cef    
!
interface Loopback0
ip address 81.x.x.146 255.255.255.255
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/0/0
ip unnumbered Loopback0
encapsulation ppp
!
ip classless
ip route 0.0.0.0 0.0.0.0 Serial0/0/0
!
ip http server
no ip http secure-server
!
control-plane
!
line con 0
line aux 0
line vty 0 4
login    
!
end

cisco1841 sh intRouter#sh int s0/0/0
Serial0/0/0 is up, line protocol is down
  Hardware is GT96K Serial
  Interface is unnumbered. Using address of Loopback0 (81.x.x.146)
  MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation PPP, LCP ACKsent, loopback not set
  Keepalive set (10 sec)
  Last input 00:00:01, output 00:00:00, output hang never
  Last clearing of "show interface" counters 00:04:02
  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  0/1/256 (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
     62 packets input, 1116 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
     151 packets output, 2362 bytes, 0 underruns
     0 output errors, 0 collisions, 15 interface resets
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions
     DCD=up  DSR=up  DTR=up  RTS=up  CTS=up

cisco805:
Router#sh run        
Building configuration...

Current configuration : 544 bytes
!
version 12.2
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname Router
!
logging queue-limit 100
!
ip subnet-zero
no ip domain lookup
!
!
!
!
interface Loopback0
ip address 81.x.x.146 255.255.255.255
!
interface Ethernet0
ip address 192.168.5.2 255.255.255.0
shutdown
!
interface Serial0
ip unnumbered Loopback0
encapsulation ppp
!
ip classless
ip route 0.0.0.0 0.0.0.0 Serial0
no ip http server
!
!
!
line con 0
stopbits 1
line vty 0 4
login
!
end

сisco 805 sh int:
Router#sh int s0
Serial0 is up, line protocol is up
  Hardware is PowerQUICC Serial
  Interface is unnumbered. Using address of Loopback0 (81.x.x.146)
  MTU 1500 bytes, BW 512 Kbit, DLY 20000 usec,
     reliability 255/255, txload 19/255, rxload 19/255
  Encapsulation PPP, LCP Open
  Listen: CDPCP
  Open: IPCP, loopback not set
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters 00:20:44
  Input queue: 1/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: weighted fair
  Output queue: 0/1000/64/0 (size/max total/threshold/drops)
     Conversations  0/3/128 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
     Available Bandwidth 384 kilobits/sec
  5 minute input rate 39000 bits/sec, 36 packets/sec
  5 minute output rate 39000 bits/sec, 36 packets/sec
     27887 packets input, 4325465 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
     27996 packets output, 4326641 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions
     DCD=up  DSR=up  DTR=up  RTS=up  CTS=up

Еще заметил что если на 1841 на сериал интерфейсе сказать ppp lcp predict то line protocol становится up, но ошибки на UMUX не отбиваются и соответтсвенно пинги не идут. Подскажите плз что такое может быть с 1841? Пакеты на интерфейсе есть как входящие, так и исходящие, значит интерфейс и кабель живой, значит что-то в конфиге не так?