“NBN is NBN — they all use the same cables, so why pay more?” I hear this in Geelong every other week, and it’s one of the most common misconceptions about Australian internet. The infrastructure is shared, yes. But what happens between your modem and Netflix? That’s where providers differ dramatically.
At peak hour, two customers on the same NBN 100 plan from different providers can see 95 Mbps vs 30 Mbps. Same line, same suburb, completely different ISP investment.
NBN delivers the cable. Your ISP decides what travels through it at 8pm on a Wednesday — that’s the part you’re actually paying for.
All NBN providers share the same “last mile” to your home. But after that? Each provider has their own bandwidth allocation, network infrastructure, international links, and content caching. These differences can mean 80+ Mbps vs 15 Mbps during peak hours on the same NBN plan.
The NBN myth vs reality
Here’s what people think happens when they sign up with an NBN provider:
The Myth
”NBN is a government-owned network. All providers just resell the same thing. The only difference is price and customer service.”
The Reality
NBN only provides the connection to your home. Everything after that — the bandwidth, the routes, the international links — is built and paid for by your ISP. Cheap providers buy less bandwidth. You get what they pay for.
What your NBN provider actually does
Let’s trace what happens when you click “play” on Netflix:
The Journey of Your Data
NBN’s job ends at the POI. Everything after that — how much bandwidth your ISP has purchased, how they route traffic, where their servers are — that’s all provider-specific.
The POI: Where the magic (or misery) happens
Australia has 121 Points of Interconnect (POIs) — physical locations where NBN hands off traffic to retail providers. Think of a POI like a highway on-ramp. NBN builds the local streets to the on-ramp. Your ISP builds (or rents) everything after that.
Victoria’s NBN Points of Interconnect
There are 19 POIs in Victoria. Your home connects to one of them based on your location.
| POI Location | Serves | Approx. Premises |
|---|---|---|
| Melbourne City | CBD, Inner suburbs | ~400,000 |
| Cheltenham | Bayside, Kingston | ~150,000 |
| Sunshine | Western suburbs | ~200,000 |
| Geelong | Greater Geelong, Surf Coast | ~120,000 |
| Ballarat | Ballarat region | ~60,000 |
| Bendigo | Bendigo region | ~50,000 |
Each ISP must purchase bandwidth at EVERY POI where they have customers. A provider might be great in Melbourne but congested in Geelong — or vice versa.
CVC: The bandwidth your ISP buys
Here’s the critical part: at each POI, your ISP purchases CVC bandwidth from NBN. This is a pool of bandwidth shared by ALL of that ISP’s customers at that POI.
How CVC Congestion Works
Well-Provisioned ISP
Plenty of headroom. Everyone gets their full speed.
Under-Provisioned ISP
Nearly maxed out. Speeds drop for everyone during peak.
This is why cheap providers often suck at peak times (7pm-11pm). They buy less CVC bandwidth to keep costs down. During the day? Fine. When everyone’s streaming Netflix after dinner? Congestion city.
How to check your ISP’s capacity
Some providers are transparent about their CVC capacity. Here’s where to look:
Aussie Broadband (Most Transparent)
Aussie Broadband publishes real-time CVC graphs for every POI, publicly accessible:
- Visit aussiebroadband.com.au/cvc-graphs
- Find your POI (e.g., “Geelong”)
- Check the utilisation percentage
Green (under 80%): Well provisioned — you’ll get your full speed
Yellow (80-90%): Getting busy — possible slowdowns at peak
Red (90%+): Congested — expect slower speeds 7-11pm
Superloop
Superloop provides CVC information in your customer portal after signup. They maintain a policy of keeping utilisation below 80%.
Telstra
Telstra doesn’t publish CVC data, but historically provisions generously. They can afford to — they charge more.
TPG/iiNet/Internode/Vodafone (TPG Group)
These brands share infrastructure. No public CVC data. Reports vary by area.
Optus
No public CVC data. Mixed reviews on peak-hour performance.
Beyond CVC: What else differs?
CVC is just the first bottleneck. Here’s what else matters:
1. The provider’s own network
After the POI, traffic travels on your provider’s backbone network to their core infrastructure. Larger providers have their own fibre networks. Smaller ones rent capacity from others.
Telstra
Owns extensive national fibre network. Traffic stays “on-net” longer.
Aussie Broadband
Built their own network. Known for quality routing.
Smaller MVNOs
Resell capacity from larger networks. Quality depends on their supplier.
2. International Links
When you access overseas content (US servers, European sites), your traffic crosses international submarine cables. Different ISPs have different:
- Capacity on these links
- Peering arrangements with overseas networks
- Routes your traffic takes
A provider might be fast for Australian content but slow for US gaming servers. International link quality affects streaming services, gaming latency, and any site hosted overseas.
3. CDN Peering
Here’s something most people don’t know: major content providers have servers INSIDE Australian ISP networks.
Content Caching Changes Everything
| Service | CDN/Cache | What It Means |
|---|---|---|
| Netflix | Open Connect | Servers inside ISP networks |
| YouTube/Google | Google Global Cache | Local Google content |
| PlayStation/Xbox | Akamai, Limelight | Game downloads |
| Steam | Steam Cache | Large game files |
| Disney+ | Disney+ CDN | Streaming content |
If your ISP has Netflix Open Connect appliances in their network, your stream travels a few kilometres instead of across the Pacific. This is why some “slower” plans feel faster than “faster” plans with poor CDN peering.
4. Peering at Internet Exchanges
ISPs connect to each other at Internet Exchanges. Australia’s main ones:
- PIPE/Equinix in Sydney and Melbourne
- IX Australia in multiple cities
- MegaPort connections
Good peering means traffic between Australian services (like accessing an Australian bank’s website) stays fast and local. Poor peering means it might route via Sydney or even overseas unnecessarily.
The technical terms explained
Internet Jargon Decoder
POI (Point of Interconnect)
Physical location where NBN hands off your traffic to your ISP. Australia has 121 POIs.
CVC (Connectivity Virtual Circuit)
Bandwidth your ISP purchases from NBN at each POI. Shared pool for all customers at that location.
AVC (Access Virtual Circuit)
Your individual connection to NBN. This is your speed tier (NBN 50, NBN 100, etc.).
Latency (Ping)
Time for data to travel from A to B, measured in milliseconds. Lower is better. Gaming needs under 30ms to feel responsive.
Jitter
Variation in latency. If ping bounces between 20ms and 200ms, that’s high jitter. Kills video calls and gaming.
Packet Loss
Data that never arrives. Even 1% packet loss causes buffering, call dropouts, and game lag.
Hops
Each router your data passes through is a “hop”. More hops = more latency and more points of failure.
BGP (Border Gateway Protocol)
How networks tell each other where to send traffic. Bad BGP = your data takes inefficient routes.
Peering
Direct connections between networks. Good peering = fast, direct routes. Poor peering = traffic goes the long way.
CDN (Content Delivery Network)
Servers placed close to users to speed up content delivery. Netflix, YouTube, and gaming platforms use these.
Backbone
The high-capacity network between POIs and the provider’s core. A better-built backbone = more consistent speeds.
Contention Ratio
How many customers share the same bandwidth. Lower ratios mean less congestion.
How to choose an ISP (the practical guide)
Step-by-Step ISP Selection
Check your NBN technology first
Visit nbnco.com.au/check-your-address. If you have FTTP or HFC, you can get the new faster tiers (500/750/1000/2000). FTTN and FTTC are limited.
Check CVC capacity for your POI
For Aussie Broadband, check their public CVC graphs. If your POI is consistently green, they’re a safe bet. Other ISPs — ask directly or check forums like Whirlpool.
Check local reviews
Performance varies by area. A provider crushing it in Sydney might be congested in Geelong. Search “ISP name + your suburb + Whirlpool” for local experiences.
Consider your usage
- Streaming/general: CVC capacity matters most
- Gaming: Latency and jitter matter — look at routing quality
- Working from home: Reliability and upstream matter
- Large downloads: CDN peering for Steam, PlayStation, etc.
Don’t be afraid to switch
NBN providers have no lock-in contracts (usually). If speeds disappoint, switch. It’s your legal right and takes about a week.
Red flags when choosing a provider
- ”Unlimited” plans significantly cheaper than competitors — They’re saving money somewhere (usually CVC)
- No mention of typical evening speeds — They don’t want you to know
- Long contracts — Good providers don’t need to lock you in
- ”Up to” speeds with no evening speed guarantee — Meaningless marketing
- No Australian support — Offshore support struggles with NBN-specific issues
The bottom line
Yes, your NBN provider absolutely matters. The “last mile” to your home is shared, but:
- CVC bandwidth at your POI determines peak-hour speeds
- Backbone network quality affects consistency
- International links matter for overseas content
- CDN peering makes streaming actually work
- Routing decisions affect latency and gaming
Paying an extra $10-20/month for a well-provisioned ISP often makes the difference between “NBN is terrible” and “NBN is great.”
For Geelong, Surf Coast, and Bellarine: Check Aussie Broadband’s CVC graph for the Geelong POI. If it’s green, they’re a solid choice. Superloop is another good option. Avoid the cheapest providers unless you’re okay with peak-hour slowdowns.
Need help with your internet?
If you’re not getting the speeds you’re paying for — or you’re not sure if the problem is your ISP, your NBN connection, or your WiFi — that’s exactly what I help with. I can test your connection, identify where the bottleneck is, and recommend whether switching providers would actually help.
Internet Diagnosis Session
- Test actual speeds vs advertised speeds
- Identify whether the issue is NBN, ISP, or WiFi
- Check your ISP’s capacity at your local POI
- Review your plan and usage patterns
- Recommendation for whether to switch (and to whom)
or call 0489 998 445
Related reading
- What is NBN? — The basics of Australia’s National Broadband Network
- FTTP Explained — Fibre to the Premises technology
- Why Your WiFi Keeps Dropping — Sometimes it’s not your ISP at all
This article explains technical concepts based on publicly available information about NBN infrastructure. See the full content disclaimer for important information about my educational content.
Common questions
What is a POI in NBN, and why does it matter?+
A Point of Interconnect (POI) is the physical location where NBN hands your traffic over to your retail ISP. Australia has 121 POIs. Your ISP must buy enough CVC bandwidth at YOUR POI to keep your connection fast — provider X might be brilliant in Melbourne but congested at the Geelong POI.
What's the difference between AVC and CVC?+
AVC (Access Virtual Circuit) is your individual NBN connection — your speed tier, like NBN 100. CVC (Connectivity Virtual Circuit) is the shared pool of bandwidth your ISP buys at each POI for ALL of their customers there. AVC is your slice of pipe; CVC is the upstream tap. Cheap ISPs cut corners on CVC.
How can I check if my ISP is congested?+
Aussie Broadband publishes real-time CVC graphs at aussiebroadband.com.au/cvc-graphs/. Find your POI, check the colour. Green is healthy. Other ISPs don't publish this — you have to lean on Whirlpool forum reports for your suburb, or ask the ISP what their typical evening speed at your POI is.
If NBN is the same network, why do speeds vary by ISP?+
Because the 'NBN' part is only one segment of the journey. After NBN hands your data off at the POI, your ISP carries it across their own backbone, peers with other networks, and connects to overseas content. Bad CVC sizing, weak peering, or poor Netflix/Steam caching all show up as 'slow internet' even though the NBN line itself is fine.
Did the September 2025 NBN speed boost change any of this?+
It raised the speed tiers — NBN 100 typically now delivers 100/20 Mbps, and NBN 1000 (~1000/50) is widely available on FTTP and HFC. But the underlying POI/CVC mechanics are unchanged. A poorly-provisioned ISP on a faster tier still chokes during peak.
Is it worth paying $10–20 more per month for a better-provisioned ISP?+
For most households, yes. The difference between a budget ISP and a well-provisioned one is often the difference between 'NBN is awful in the evenings' and 'NBN works fine'. Especially if you have kids, work from home, or stream a lot at peak.
Serving Geelong, Surf Coast, and Bellarine Peninsula.
Why Oh WiFi · 0489 998 445 · hello@whyohwifi.com.au