请教各位大虾:

我这有一台CISCO2610路由器,进入配置,用SHOW INT S0/0 ,显示Serial0/0 is up, line protocol is down,但模块灯是亮的,为什么,是配置原因还是硬件问题?希望大家帮帮忙,谢谢!

我的CISCO 2610配置如下:
jjdc#show run
Building configuration...

Current configuration : 934 bytes
!
version 12.2
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname jjdc
!
enable secret 5 $1$WUOn$UgZfQ2EI3KwOkww.NoGXr1
enable password cisco
!
ip subnet-zero
!
!
!
!
!
!
interface FastEthernet0/0
ip address 10.234.57.9 255.255.255.0
duplex auto
speed auto
!
interface Serial0/0
ip address 192.168.2.2 255.255.255.0
no ip mroute-cache
!
interface Group-Async1
ip unnumbered FastEthernet0/0
encapsulation ppp
async mode interactive
peer default ip address pool zldc_pool
group-range 33 48
!
ip local pool zldc_pool 10.234.57.20 10.234.57.35
ip classless
ip route 10.234.56.0 255.255.255.0 192.168.2.1
ip route 10.234.57.0 255.255.255.0 10.234.57.1
ip http server
ip pim bidir-enable
!
!
!
line con 0
line 33 48
modem InOut
modem autoconfigure discovery
autocommand ppp
transport input all
flowcontrol hardware
line aux 0
line vty 0 4
password cisco
login
!
!
end