Troy Baird wrote: > There are options for cost effective smaller 10g fanless switches > that are perfect for this situation....
Passive DWDM optical systems work too -- no electronics in the street at all, and so no need for expensive provision of roadside electricity. DWDM gear is normally pretty expensive, but that's because the parts are traditionally long-haul (high powered lasers, sensitive receivers, low loss optical muxes). If you plan for a reach of 10Km then the parts are only slightly more than the equivalent-speed 1310nm part. That means that 1Gbps would be the current sweet point for domestic connections, and 10Gbps for local schools and network-centric businesses. Such a design would have meant that NBNCo's task would have been to get a 100GHz channel of light to each house or apartment. What happens from there would then be up to the ISP (lighting at 100Mbps, 1Gbps, 10Gbps, 25Gbps; using a switch port per client, or using a PON-style optical bus for a group of 'value' clients which then contend for the switch port). Very much a financial model like the twisted pair last mile -- the last-mile carrier gets a fixed income per DWDM channel and charges for exchange space; the ISP turns those fixed raw materials into a range of products (1Gbps contended, 1Gbps dedicated, 10Gbps dedicated, 10Gbps dedicated redundant, and so on). Muxes also allow a north-add-drop and a south-add-drop for each channel. So if the two ends of the trunk fibre run to different exchanges then these systems naturally provide redundancy -- each premises sees a channel north and a channel south. A domestic premises might well chose not to increase its telecommunications costs and so populate only the north-facing channel. A business might choose to populate both the north-facing and south-facing channels, paying their ISP more accordingly. I've long stated my belief that the design choice for a National Broadband Network wasn't copper versus fibre; but an optical network with active equipment or an optical network with passive equipment. Many people have heard this particular rant, so this will be my only post, especially since the topic only has historical interest. Thanks for your time, glen _______________________________________________ AusNOG mailing list [email protected] http://lists.ausnog.net/mailman/listinfo/ausnog
