Because you see this is not like building a bridge.Conflating "whole network" with Customer Access Network.
Some people will say, this is like building the Harbour Bridge and we wouldn’t build the Harbour Bridge with one lane.
Well you wouldn’t.
But a telecommunications network evolves.
And it is built up and expanded every year so that you’ve got that luxury that you can invest no more money today to meet the demand of today and the foreseeable future; and then in 10 years’ time you can make another investment and another investment.
And so you can add to it incrementally.
Telco Networks are in two broad parts, the "edge", or Customer Access Network that connects to individual homes and premises, and the "core", where the real high-speed, high-reliability switching and transmission is done. Core networks were upgraded to fibre in the 1980's. Telstra migrated to pure digital network then and since have moved to a pure Internet network.
Core networks are very different to the far-flung, low-speed, high-maintenance Customer Access Network.
1. Yes the internal core networks are continually upgraded, evolve and undergo incremental change. because they were designed for that.
2. The Customer Access Network is built to a 1925 specification for subscriber (pulse) dialling phones at 4kHz. Getting radio-over-lousy-copper to work, xDSL, is temporarily covering up the
problem.
- The Copper CAN was never designed for incremental upgrade.
- There are some spare copper pairs included when the cables are permanently fixed/installed, that's it. There is very little extra capacity built into the Customer Access Network that could be used for "incremental" upgrades.
3. The only Customer Access Network technology that offers incremental upgrades for data, not telephone (4kHz) is Fibre. Right now, you can start with 10-12Mbps and go right past 1,000,000Mbps. All you have to do is change the the transceiver. Cheap, quick, easy.
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