This controls IP/TCP header compression on a specific demodulator's link, reducing per-packet overhead on the bandwidth-constrained satellite channel. Per the field's own description, it only actually functions when FAST is available and enabled on both the transmitting and receiving ends of the link, so setting this to enabled(1) locally without a matching setting at the far end yields no real benefit despite the local configuration appearing 'on.' For example, an admin enabling this on one end of a link without coordinating with the remote site's configuration would see no actual bandwidth savings even though the field reads enabled here.