官网都有！
SDH口：
http://www.juniper.net/techpubs/en_US/junos14.2/topics/topic-map/sonet-interfaces-loopback-testing.html
FE/GE/XE口：
http://www.juniper.net/techpubs/en_US/junos14.2/topics/topic-map/ethernet-fast-and-gigabit-loopback-testing.html
T3口：
http://www.juniper.net/techpubs/en_US/junos14.2/topics/topic-map/t3-interfaces-loopback-testing.html
T1口：
http://www.juniper.net/techpubs/en_US/junos14.2/topics/topic-map/t1-interfaces-loopack-testing.html
ATM口：
http://www.juniper.net/techpubs/en_US/junos14.2/topics/topic-map/atm-interface-loopback-testing-use.html
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