路由器未接地引起的无法拨号故障解决

       620#sh run
Building configuration...
Current configuration : 866 bytes
!
version 12.2
service timestamps debug uptime
service timestamps Jog uptime
no service password-encryption
!
hostname2620
enable secret 5 $1$pUrf$9xGOg.zyxKawi9NljLHHr1
usernameuser password 0 Cisco
ip subnet-zero
!
!
no ip DOmain-lookup
!
!
!
!
interface FastEthernet0/0
ip address 136.0.0.254255.255.0.0
duplex auto
speed auto
!
interface Group-Async1
ip unnumbered FastEthernet0/0
encapsulation ppp
async default routing
async mode interactive
peer default ip address pool lab
ppp authentication chap
group-range 33 48
!
!
ip classless
no ip http server
ip pim bidir-enable
!
!
line con 0
password cisco
line 33 48
login local
modem InOut
autocommand ppp
transport input all
autoselect ppp
stopbits 1
flowcontrol hardware
line aux0
line vty 0 4
password Cisco
login 
!
no scheduler allocate
end