1.5 Compare and contrast common units of measure
📘CompTIA ITF+ (FC0-U61)
1. What is Throughput?
Throughput refers to how much data is transferred from one place to another in a given amount of time.
In IT, throughput is mainly used to describe:
- Network speed
- Internet connections
- Data transfer rates
- Bandwidth capacity of network devices
Throughput is measured in bits per second, written as bps.
⚠️ Important for the exam:
Throughput measures speed of data transfer, not storage size.
2. Bit vs Byte (Very Important for ITF+)
Before learning throughput units, you must understand bit and byte.
| Term | Meaning |
|---|---|
| bit (b) | Smallest unit of data (0 or 1) |
| byte (B) | 8 bits |
Key Exam Rule
- Lowercase “b” = bits
- Uppercase “B” = bytes
Throughput always uses bits, not bytes.
3. Base Unit: bps (Bits per Second)
bps (bits per second)
- bps is the basic unit of throughput
- It means how many bits are transferred in one second
Example (IT environment):
- A very slow or legacy network connection may be measured in bps
Because bps is very small, higher units are commonly used.
4. Higher Throughput Units
Throughput units increase using multiples of 1,000 (not 1,024).
⚠️ Exam Tip:
Network speeds use decimal (base-10), not binary.
4.1 Kbps (Kilobits per Second)
- 1 Kbps = 1,000 bps
- Used for:
- Very slow network connections
- Older network technologies
- Low-speed data links
IT usage:
- Small control signals
- Low-bandwidth network connections
- Legacy communication systems
4.2 Mbps (Megabits per Second)
- 1 Mbps = 1,000 Kbps
- 1 Mbps = 1,000,000 bps
This is one of the most common throughput units.
IT usage:
- Internet connections
- Wi-Fi speeds
- File downloads/uploads
- Streaming services in enterprise networks
Example (IT environment):
- A network interface card (NIC) may support 100 Mbps
- Internet service plans are often measured in Mbps
4.3 Gbps (Gigabits per Second)
- 1 Gbps = 1,000 Mbps
- 1 Gbps = 1,000,000,000 bps
Used in high-speed networks.
IT usage:
- Enterprise networks
- Data centers
- High-speed Ethernet (Gigabit Ethernet)
- Server-to-server communication
- Network backbone connections
Example (IT environment):
- Modern switches and routers often support 1 Gbps or higher
4.4 Tbps (Terabits per Second)
- 1 Tbps = 1,000 Gbps
- 1 Tbps = 1,000,000,000,000 bps
Used in very large-scale IT environments.
IT usage:
- Internet backbone infrastructure
- Cloud service providers
- Large data centers
- Global network traffic measurement
⚠️ Tbps is not common for home or small business networks, but you must recognize it for the exam.
5. Summary Table (Very Exam-Friendly)
| Unit | Full Name | Value |
|---|---|---|
| bps | Bits per second | Base unit |
| Kbps | Kilobits per second | 1,000 bps |
| Mbps | Megabits per second | 1,000 Kbps |
| Gbps | Gigabits per second | 1,000 Mbps |
| Tbps | Terabits per second | 1,000 Gbps |
6. Throughput vs Bandwidth (Exam Concept)
Many students confuse these terms.
| Term | Meaning |
|---|---|
| Bandwidth | Maximum possible data transfer rate |
| Throughput | Actual data transferred per second |
For the ITF+ exam:
- Throughput is what you actually get
- Bandwidth is what the network can support
7. Common Exam Traps to Avoid
❌ Mistake 1: Confusing bits and bytes
- Mbps ≠ MBps
- Throughput uses bits (b), not bytes (B)
❌ Mistake 2: Using 1,024 instead of 1,000
- Storage = 1,024
- Throughput = 1,000
❌ Mistake 3: Thinking higher throughput means more storage
- Throughput = speed
- Storage = capacity
8. Why Throughput Units Matter in IT
Throughput units are used to:
- Compare network speeds
- Select network hardware
- Measure internet performance
- Evaluate data transfer efficiency
- Understand service provider specifications
For ITF+, you must be able to:
- Recognize each unit
- Know their order from smallest to largest
- Understand where they are used in IT environments
9. Final Exam Takeaways
✔ Throughput measures data transfer speed
✔ Units are measured in bits per second
✔ Common units: bps → Kbps → Mbps → Gbps → Tbps
✔ Uses multiples of 1,000
✔ Widely used in networking and internet connections
