MTRJ stands for Mechanical Transfer Registered Jack. MT-RJ is a fiber-optic Cable Connector that is very popular for small form factor devices due to its small size. The MT-RJ is commonly used for networking applications. Its size is slightly smaller than a standard phone jack and just as easy to connect and disconnect. It´s half the size of the SC Connector it was designed to replace

SC stands for Subscriber Connector- a general purpose push/pull style Connector developed by NTT. SC has an advantage in keyed duplexibility to support send/receive channels.

Features:

Low insertion loss(≤ 0.20dB)and high return loss(≥ 55 dB)
Free-floating ceramic ferrule
UL-rated plastic housing and boot
Boots in a variety of colors
High precision alignment connector

Applications:

Local Area Networks (LANs) and Wide Area Networks (WANs)
Fiber Optic CATV, FTTH, FTTB, FTTP etc
Fiber Optic telecommunication systems
Transmission Mode (ATM)
Fiber Optic Backbone
Military Instrumentation