HSIO Loopback Turns Challenges Into Opportunities For Test At 112 Gbps

By Dave Armstrong and Don Thompson For both PCIe and Ethernet (IEEE 802.3,) signals are getting mighty small. With PCIe 5 reaching 32 Gbps (NRZ at 32 GBaud) and 802.3 reaching 112 Gbps (PAM4 at 56 GBaud), typical eye-mask limits are shrinking. Consequently, test requirements for high-speed I/O (HSIO) test are becoming daunting. HSIO test involves measurement of Tx eye height and width, co... » read more