E1 模块RJ48 打环测试的线序：1、4，2、5
control E1 1/0
framing no-crc4
channel-group 0 timeslots 1-31
controller E1 0/0/0
channel-group 0 unframed
信道化（Channelized）方式下:
Router_config#controller E1 0/0
Router_config_controller_E1_0/0#channel 1 timeslots 1-31（此处可以分为多可信道分配）
Router_config_controller_E1_0/0#int s0/0:1
Router_config_controller_s0/0:1#enca fr
Router_config_controller_s0/0:1#ip add 130.130.0.1 255.255.255.0
非信道化（Unchannelized）方式下（现在多数为此种）:
Router_config#controller E1 0/0
Router_config_controller_E1_0/0#unframed
Router_config_controller_E1_0/0#int s0/0:0
Router_config_controller_s0/0:0#enca fr2
Router_config_controller_s0/0:0#ip add 130.130.0.1 255.255.255.0