Browsed by
Tag: Pre-emphasis

Hardware – Equalization and Pre-emphasis

Hardware – Equalization and Pre-emphasis

Comments 3 comments

Before we look at equalization and pre-emphasis, we should examine some fundamentals of waves and signals. A perfect square wave is a really useful way of representing a waveform in the time-domain, but it’s not the only way of looking at the signal.The name ‘time-domain’ may be new but the view is familiar to us all, you have amplitude on the vertical axis and time you have time on the horizontal scale. Ideal square waves need infinite bandwidth The square wave…

Read More Read More

Hardware – Comparing 10G SFP+ with XFP

Hardware – Comparing 10G SFP+ with XFP

Comments 2 comments

In the last post I discussed clock and data recovery (CDR). This post examines an application of re-timers (or CDRs) within XFP and SFP+ transceivers. I’ve previously covered the size, power and connector differences of 10G transceivers before, but this post will focus on the differences between XFP and SFP+ and how they connect to the ASIC. Take a look at the XFP block digram below which shows the XFI electrical interface from an XFP module connecting to the the host device (ASIC…

Read More Read More