路由器：思科3845
模块：2块NM-2CE1T1-PRI-E=
线路为2M方式，不分时隙；
问题：路由器插上模块，加电启动后，观察到路由器启动自检时模块上面的检测灯正常；
ios启动显示出也检查到该模块了；
但是，启动后，sh run 没有看到E1的信息，也没有看到串口的信息；config 模式下，
没有controller的命令。
解决方法如下：
3845(config)#card type e1 3 ；模块所在的槽位
3845(config)#card type e1 4
然后，在config模式下面就能看到controller的命令了，
3845(config)#controller e1 3/0
3845(config-controller)#channel-group 0 unframed ；设置成非时隙方式
3845(config-controller)#clock line ；从线路获得时钟
完毕后，sh int 就可以看到以下信息了:
Serial3/0:1 is reset, line protocol is down
Hardware is M32X with CSU/DSU
MTU 1500 bytes, BW 2048 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, loopback not set
Keepalive set (10 sec)
Last input never, output never, output hang never
Last clearing of "show interface" counters never
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 1536 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
Timeslot(s) Used: 0-31(UNFRAMED), Transmitter delay is 0 flags
