What is m13 link?

M13 is a common Ethernet media interface standard. It was originally developed by the CCITT (now ITU-T), and is also known as "ITU-T G.703". The M13 interface is used to connect T1 links between devices such as routers, switches, and multiplexers.

M13 provides a convenient way to aggregate multiple T1 links into a single interface. A single M13 link can support up to 28 T1 lines, and these lines can be easily combined into a single high-bandwidth connection.

M13 links use a DS3 framing format, which allows for efficient data transmission across the link. The link also supports channelized data, which allows individual T1 lines to be used for voice or data applications.

In summary, M13 is a widely used standard for connecting T1 links together, and provides a flexible and efficient way to aggregate multiple T1 lines into a single interface.