Hardware – What’s the ‘holdup’?
This post discusses power supply ‘holdup’, and how it can impact network or server hardware uptime. The holdup time or ‘output holdup time’ is the length of time that a given power supply can maintain output power to the switch … Continue reading
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Planning projects instead of burning benjamins
Engineers are often unstuck by poor planning and get hit with large financial penalties as a result. Projects can become mired in delays and complications due to unforeseen costs and expenses. There are some unavoidable bumps in the road, but … Continue reading
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Hardware – Equalization and Pre-emphasis
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 … Continue reading
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Hardware – Is SFP+ just a smaller version of XFP?
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 … Continue reading
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Hardware – Clock and Data Recovery
Clock and data recovery is an essential physical-layer function of modern switch and router hardware. Digging deep into the electronics of a router may not be your thing, but clock recovery is a fundamental building block for other network hardware … Continue reading
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Build a 48-port switch using a 24-port ASIC
Modern top-of-rack switches (or TORs) run at line rate and are non-oversubscribed. This means you get non-blocking [1] port-to-port throughput within the switch ASIC at the line rate of the front panel ports. Almost all TOR switches use a single switch … Continue reading
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AirConsole Review
If you need regular console port access then nothing beats a fixed console router. However there are many times when that simply isn’t an option. For occasional console connections I use a Keyspan USB/Serial adaptor with my MacBook. It’s … Continue reading
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