What is CVC? Why NBN speeds are improving in July 2026.

Why this happens

• CVC is charged per Mbps of peak bandwidth — ISPs pay for the pipe between their network and NBN Co, separate from the fixed access line charge per customer
• To keep wholesale costs down, many ISPs provision less CVC than customers need during the 7–11 pm peak, which is the main cause of evening slowdowns
• Larger ISPs can spread CVC costs across more customers and negotiate better rates; smaller ISPs face higher per-customer CVC costs for the same speed outcome
• The gap between a plan's maximum speed and its Typical Evening Speed is largely a CVC provisioning decision by the ISP, not an infrastructure limit

How to fix it — step by step

1. 1. What CVC is and how it works

   When your data travels from the internet to your home, it passes through two segments: the access network (the fibre, copper, or coaxial connection from your premises to an NBN node) and the backhaul path from the node to your ISP's systems. CVC is the capacity your ISP buys on that backhaul segment — think of it as the width of the highway between NBN Co and your ISP. Access line charges are fixed per customer; CVC is an additional per-Mbps charge that scales with how much bandwidth the ISP commits to carrying at peak.

2. 2. How CVC congestion causes evening slowdowns

   At 7 pm, millions of households stream video simultaneously. If an ISP has not bought enough CVC to carry all that traffic, packets queue and speeds drop. The result is a plan that delivers 95 Mbps at 10 am and 40 Mbps at 8 pm on the same connection. This is not a network fault — it is a deliberate provisioning decision. An ISP's published Typical Evening Speed reveals how well they manage their CVC: a well-provisioned ISP shows a Typical Evening Speed close to the plan maximum; a congested one shows a significant gap between the two.

3. 3. What changes on 1 July 2026

   NBN Co is eliminating CVC charges on 1 July 2026. From that date, ISPs pay a single flat access charge per customer and are not penalised for carrying more bandwidth during peak hours. The financial incentive to constrain evening speeds disappears. ISPs that have been underprovisioning CVC to control costs will no longer have a reason to do so — and ISPs that built good networks will no longer be at a cost disadvantage against those that cut corners on bandwidth.

4. 4. What this means when choosing an ISP right now

   Before July 2026, Typical Evening Speed is the most useful single figure for comparing ISPs — it reveals how much CVC each ISP has been willing to invest in. After July 2026, the distinctions will narrow as congestion incentives disappear, but ISPs with strong underlying infrastructure will still outperform those that relied on CVC underprovisioning to mask network shortcomings. Check the CIS for any plan you are considering and compare its Typical Evening Speed to the plan maximum before signing up.

5. 5. Why HIT Pacific was built for the post-CVC world

   HIT Pacific was founded specifically because CVC elimination changes the economics of running an ISP. When CVC disappears, wholesale NBN costs are identical whether you have 100 or 100,000 customers — meaning a small ISP can offer the same network performance as a large one, with better service. We launched in May 2026 to get customers onto our network before the July change, so they benefit from the improvement from day one. Check your address at hitpacific.com.au.