HelenOS sources

ANAR_PAUSE        391 uspace/drv/nic/rtl8139/defs.h 	ANAR_PAUSE        = (1 << 10),
ANAR_PAUSE        250 uspace/drv/nic/rtl8169/defs.h 	ANAR_PAUSE = (1 << 10), /**< Symetric pause frame capability */
HelenOS homepage, sources at GitHub