Talk:Network isolator

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Ethernet standard[edit]

The Ethernet standard (802.3) specifies 1 kV isolation on every Ethernet port. I assume this article is talking about isolation above and beyond that. --Kvng (talk) 03:41, 7 September 2010 (UTC)[reply]

Isolation and line coding[edit]

Per my discussion Talk:Ethernet, I'm trying to understand how line coding relates to the feasibility of network isolation using an isolation transformer. In particular, I gather that USB, which appears to use NRZI, cannot easily be isolated. My sense is that this relates either to technical issues with NRZI, or to the fact that USB uses other tricks (like pulling a data line high) that can't be seen over a transformer. Since Fast Ethernet uses MLT-3 not Manchester coding, it's clear that Manchester isn't the only coding that can be passed through a transformer.

So: Is there a mathematical property of a line coding that allows it to be transmitted through a transformer? Is it just that bits need to be encoded as edges rather than as voltages? Thanks. —Ben FrantzDale (talk) 14:04, 4 April 2013 (UTC)[reply]

The property is DC balance. -—Kvng 15:32, 11 April 2013 (UTC)[reply]