关于S0/0 口，X25问题！

CaesarLB

各位好：
    我有一台3640的机器，上面插了一块Wic－1T的卡，通过CAB-232FC连接一块Eicon C90的X25卡。

1.我用show int s0/0看到的信息是：
   CBC_Router#show int s0/0
     Serial0/0 is down, line protocol is down

2.Eicon卡启动的时候，提示错误：
     eccard: error #pd342
     port 1. network status [a0-0]. link level is not ready

我上网查询了Eicon的错误说明：
@PD342

Port nn. Network status xxxxxxxx. Link level is not ready.

The remote side of the connection is not ready, or both the local and remote
are configured as DCE or DTE. Verify your configuration and change it if
necessary.   

疑问：
1. Serial0/0 is down：是不是说明物理有问题？
2. @PD342错误好像不是物理连接错误吧？
   因为我把线拔了，Eicon启动的时候报PD321错误，PD321错误是物理连接错误。


Cisco配置如下：
CBC_Router#show run
Building configuration...

Current configuration : 755 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname CBC_Router
!
boot-start-marker
boot-end-marker
!
enable secret 5 $1$frn9$LRSq0L7SAnJdea6zM5FwR/
enable password zxcbc
!
no aaa new-model
ip subnet-zero
ip cef
!
!
!
no ip domain lookup
no ftp-server write-enable
!
x25 routing
!
!
!
interface FastEthernet0/0
ip address 192.168.1.2 255.255.255.0
duplex auto
speed auto
!
interface Serial0/0
no ip address
encapsulation x25 dce
x25 htc 16
clockrate 64000
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
ip classless
ip http server
!
x25 route 1111 interface Serial0/0
!
line con 0
line aux 0
line vty 0 4
password zxcbc
login
!
end

charlesc

x25 nvc 2

CaesarLB

我加了 X25 nvc 2好像还是不行！
请大家帮我再看看？