# Configuring HDLC processing on CG 6000/C boards

CG 6000 and CG 6000C boards use the on-board HDLC controllers to perform HDLC data processing. Each CG board T1 or E1 trunk is associated with a single framer instance. On CG 6000 and CG 6000C boards each framer instance is hard-wired to three HDLC instances.

Applications can use functions from the NMS GR303 or NMS V5 libraries to dynamically configure and operate these HDLC instances once the board environment is booted. The HDLC instances on CG 6000 and CG 6000C boards are organized as shown in the following illustration:

Refer to CG 6000 and CG 6000C board keyword files for examples of board keywords used to configure these boards for NMS GR303 and NMS V5.