On serial interfaces, we normally change the layer-2 protocol, known as the encapsulation, with a configuration command. On a standard serial interface, the default encapsulation is High-Level Data Link Control (HDLC).
The MEC14XX family is one of the first to support both the Intel® Corporation’s new Enhanced Serial Peripheral Interface. Data Rate (CAN FD. Web Services. Each T3 or E3 interface can be configured for full. • Asynchronous bit serial PPP/High-Level Data. For more information about Cisco Services.
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We can change this encapsulation with the encapsulation ppp or encapsulation frame-relay commands. Other examples of layer-2 encapsulations on a serial interface include HDLC, Synchronous Data Link Control (SDLC), and X.25. In contrast, if we want to connect to an ATM circuit from a telephone company, we cannot simply change the encapsulation on our serial interface to something like encapsulation atm.
(Note: The only exception is the MC3810's multiflex trunk module, which uses a software-based SAR.) This is because a 'native' ATM interface, such as the PA-A3 port adapter for the Cisco 7x00 router series, consists of special hardware and a segmentation and reassembly (SAR) chip for chopping up variable-length IP or other data frames into fixed 53-byte cells. Instead, what we can do is configure the serial interface with the encapsulation atm-dxi command. Data exchange interface (DXI) encapsulates your data inside HDLC-like frames and carries these frames to an ATM data service unit (DSU).
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