BackWhat is a Router? Modem vs Router Explained
While they may look like similar black boxes with blinking lights, your modem and router perform 2 entirely different jobs. One brings the internet into your home, while the other shares it with your devices.
In This Guide
- What is a Modem?
- How does a Modem work?
- Different types of Modem connections
- What is a Router?
- How does a Router work?
- Router vs. Switch
- Modem vs. Router
- What this means for your set-up?
- FAQs
The Modem brings the internet to your home; the Router shares it with your devices.
This guide breaks down exactly how these two work together to keep you online, how to tell them apart on your shelf, and what to check first if your connection ever feels slow.
What is a Modem?
A modem is the essential bridge between your home and the internet. Its primary job is to translate the signals from your Internet Service Provider (ISP) into a digital language that your devices like your router and computer can actually understand.
Put simply: The modem acts as a translator. It takes the raw information "language" used by the outside world and converts it into the "digital language" used by your home network.
How Does a Modem Work?
Think of your modem as a 2-way converter that keeps a constant conversation going:
Receiving (The Incoming Translation)
Internet signals enter your home as analog waves. Since your laptop only speaks "digital" (1s and 0s), the modem demodulates these waves, turning them into digital data for your router to share.
Sending (The Outgoing Translation)
When you click "Send" on an email, your modem takes that digital data and modulates it back into signal waves so it can travel back out across your ISP’s infrastructure to reach its destination.
In short: The modem is the only device that speaks both "Internet" and "Computer," making it the essential gateway for your connection.
Different Types of Modem Connections
Technology has come a long way. Here is how modems have evolved over the years:
The "classic" era of the internet. It used a standard phone line and made famous beeping sounds to connect. It was slow and occupied your phone line while in use—now mostly a thing of the past.
A major speed upgrade using phone or TV lines. Cable modems are still widely used globally today to provide reliable high-speed surfing and streaming for the whole family.
Most common in Singapore today. For Fiber connections, you likely use an Optical Network Terminal (ONT). It works like a modem but uses light signals to deliver ultra-fast Gigabit speeds.
What is a Router?
A router is an intelligent networking device that acts as a traffic officer for your data. It takes the internet connection coming from your modem and shares it across all your devices like your laptops, smartphones, and smart TVs, ensuring every piece of information finds the fastest path to the right screen.
Put simply: While the modem brings the internet to your door, the router is the "host" that invites your devices in and keeps them all connected and organized.
How Does a Router Work?
A router manages your digital life through 3 primary roles:
1. Directing Data
The router breaks information into small "packets" and uses a digital map called a routing table to guide them. It makes split-second decisions to avoid network "traffic jams."
2. Sorting by Address
To ensure data reaches the right person, the router gives every device a unique IP address. This ensures your Netflix movie goes to your TV, and not your laptop.
3. Guarding the Door
The router acts as a firewall. It inspects incoming traffic to block unauthorized visitors, keeping your home network safe from outside threats.
In short: The router is the "brains" of your network, making sure your internet is fast, organized, and secure.
Router vs. Switch
These 2 devices look similar, but they have very different jobs:
Think of a switch as a power strip for data. It connects devices inside your home to each other (like linking your PC to your printer) so they can talk directly.
A router connects your entire home network (LAN) to the outside world (the Internet). It is the essential gateway that lets your whole house get online.
Modem vs. Router:
A Side-by-Side Comparison
While they might look like similar blinking boxes, they perform two completely different roles. The Modem is your translator to the outside world, whereas the Router is the manager of your home network.
What this means for your setup?
1. Can you use a modem without a router?
Technically, yes. If you plug a single computer directly into your modem with a cable, you’ll get internet. However, because a modem can’t create a Wi-Fi signal or handle more than one connection, your phones, tablets, and other laptops will be left in the dark.
2. Can you use a router without a modem?
No. A router is like a high-tech internal phone system. It lets all the rooms in a building talk to each other, but without an external line (the modem) to connect them to the outside world, you can't actually make a call. The router simply doesn't speak the same "language" as the raw signal from your provider.
3. What if you only have one box?
Don't worry, you aren't missing anything. You likely have a Gateway, which is just a modem and a router combined into one shell. It's a popular choice because it saves space and reduces cable clutter.
Frequently Asked Questions
Yes, in most home setups. Your ONT (modem) brings internet into your home but cannot share it wirelessly. Your router takes that connection and creates your home WiFi network so every device can get online. The two work as a pair and one does not replace the other.
Your router needs an ONT to access the internet. Without one, the router has no internet signal to share. You can technically use a router alone to create a local network between devices for sharing files, but nothing on that network will have internet access.
Functionally, yes. An ONT is Singapore's version of a modem. The difference is technology: a traditional modem works with older cable or DSL connections, while an ONT is designed for fibre-optic broadband. If you have fibre broadband in Singapore, you have an ONT, not a traditional modem.
Try this test: plug a laptop directly into your ONT using an Ethernet cable and run a speed check. If the speed is fast with a direct connection but slow over WiFi, the issue is your router or its placement. If the speed is also slow with a direct connection, the problem is likely with your ONT or your broadband plan, so contact your provider.
A modem (ONT) and router are two separate devices. A gateway, called an ONR (Optical Network Router) in Singapore, is a single device that combines both into one box. It connects to your fibre wall point and broadcasts WiFi directly, so no separate router is needed. See our ONT vs ONR guide for the full comparison.
Yes. All StarHub UltraSpeed plans (3Gbps, 5Gbps, and 10Gbps) come with a TP-Link WiFi 7 router built-in. Hub Troopers handle the full installation, connecting the ONT and router, positioning the router for best coverage, and testing the connection, at no extra cost.
Get Fibre Broadband with a WiFi 7 Router
All StarHub UltraSpeed plans include a TP-Link WiFi 7 router and Hub Trooper installation at no extra cost, so you are online from day one, no setup required.
UltraSpeed 10Gbps at $38.90/mth (U.P. $121.01/mth)
Free TP-Link HB710 WiFi 7 router (Tri-band BE18000). Smooth 4K streaming for 4+ users and devices, ultra-low latency gaming, free 12 months CyberProtect 3. For new sign-ups.
UltraSpeed 5Gbps at $45.00/mth (U.P. $68.53/mth)
Free TP-Link HB710 WiFi 7 router (Tri-band BE18000). Smooth 4K streaming for 2–4 users, free 12 months CyberProtect 3.
UltraSpeed 3Gbps at $39.91/mth (U.P. $58.83/mth)
Free TP-Link HB410 WiFi 7 router (Dual-band BE6500). Smooth 4K streaming for 1–2 users, free 3 months CyberProtect 3.
Disclaimer:
This content is provided for general information and convenience. While we take care in preparing our articles, readers should refer to official sources or professional advice for specific, up-to-date details.
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