Year	Pairs	Medium	Mbit/s	Switch Σ 38500
1994?	1	Coaxial	10	-
2001	1+1	Twisted pair	100	×5 = 500
2005	4		1000	×8 = 8000
2021			2500	×(2+4) = 15000 ×2+2500×4 = 30000
2026			10000
			40000
	1+1	Fibre