PoE Switch Sizing for CCTV: Ports, Power Budget and Uplink Capacity
Essential Security Supplies
Choosing a PoE switch for CCTV is not simply a matter of matching the number of camera ports. A reliable design must account for the number of cameras, PoE class, maximum power draw, uplink bandwidth, cable distance and future expansion.
This guide explains how to size a PoE switch for professional security camera installations, using active PoE switch examples available from Essential Security Supplies in New Zealand.
Start with the camera load, not the switch label
The correct switch is determined by the total camera load and the way the network will be used. A switch with eight PoE ports may be suitable for eight low-power cameras, but it may not have enough total power for multiple PTZ cameras, infrared illuminators, heaters or other high-draw devices.
Begin by listing each connected device and recording four details:
- Number of devices
- PoE standard or class required
- Maximum power draw per device
- Required network bitrate
Use the maximum documented device draw for planning rather than the typical operating figure. Then allow spare capacity for startup demand, infrared operation, motorised cameras and future additions.
For a small installation with four standard fixed cameras, an active View our product may be appropriate. For eight cameras requiring Gigabit connections and PoE+, a model such as the View our product provides a larger power reserve and higher-speed access ports.
How many PoE ports does a CCTV switch need?
Count one PoE port for every powered camera or network device connected directly to the switch. Do not count the uplink port as a camera port unless the switch documentation specifically identifies it as a PoE output.
For practical installation planning, avoid using every available port on day one. A useful approach is to allow at least one or two spare PoE ports for replacement cameras, additional views, access points or other network devices.
| Camera requirement | Typical switch size to investigate |
|---|---|
| Up to 3 cameras | 4-port PoE switch, with spare capacity for one additional device |
| 4 to 6 cameras | 8-port switch, depending on PoE budget and uplink requirements |
| 7 to 14 cameras | 16-port PoE or PoE+ switch, especially where expansion is expected |
| 15 to 22 cameras | 24-port PoE+ switch with dedicated uplinks or SFP connectivity |
| More than 22 cameras | Multiple switches, a larger managed switch or a fibre-connected distribution design |
Port count is only the starting point. A 24-port switch with a 168 W budget may be unsuitable for 24 high-draw devices, while a smaller 16-port switch with a 192 W budget may provide more usable power for a medium-sized camera system.
Calculate the PoE power budget
The PoE power budget is the total amount of power the switch can provide across its PoE ports. It is different from the maximum power available on one individual port.
Use this calculation:
Total camera load = maximum device draw added together
Then compare the result with the switch's stated total PoE budget. Keep a sensible reserve rather than designing the system to operate continuously at the absolute limit.
For example, a camera may require little power during daylight but draw more when infrared LEDs, a heater or a motorised lens is operating. PTZ cameras can also have a much higher peak demand than fixed cameras. Confirm the maximum requirement from the camera specification sheet before selecting the switch.
The active View our product listing states support for eight PoE+ ports, up to 30 W per port and a 126 W total PoE budget in the detailed description. The product title shows 124 W, so installers should confirm the final manufacturer specification before issuing a formal equipment schedule.
802.3af, 802.3at and higher-power devices
Standard PoE devices do not all use the same power level. A switch supporting IEEE 802.3af may be suitable for many basic fixed cameras, while 802.3at PoE+ provides more capacity for cameras and other devices with higher requirements.
Check both sides of the connection. The switch must support the required PoE standard, and the camera must be compatible with that standard. A port advertised as 30 W maximum does not mean every connected device will receive 30 W, nor does it increase the total switch budget.
The active AAP View our product is listed with 802.3af/at support and 30 W per port. Its 10/100 Mbps port speed makes it a compact option for suitable camera systems where Gigabit connectivity is not required.
Plan the uplink capacity
The uplink carries camera traffic from the PoE switch to the NVR, VMS server, router or wider network. A switch can have enough PoE ports and power while still becoming a bandwidth bottleneck if the uplink is undersized.
To estimate the required bandwidth, add the expected bitrate of all cameras that will pass through the uplink, then allow room for network overhead, recording traffic, remote viewing and future expansion.
- Use Gigabit uplinks for most modern CCTV distribution switches.
- Consider multiple uplinks, link aggregation or higher-speed fibre where many high-resolution cameras share one switch.
- Check whether SFP ports are Gigabit, 2.5 Gigabit, 10 Gigabit or another speed.
- Do not confuse the switch's internal switching capacity with the speed of its uplink ports.
The active View our product provides 24 x 1000 Mbps PoE ports, two additional 1000 Mbps RJ45 ports and two 1000 Mbps combo ports. Its listed switching capacity is 56 Gbps, with a forwarding performance of 41.7 Mpps.
For larger deployments, the active TP-Link TL-SG1428PE provides 24 Gigabit PoE+ ports, two additional Gigabit non-PoE RJ45 ports and two Gigabit SFP slots. Its listed switching capacity is 56 Gbps, with a forwarding rate of 41.7 Mpps.
When should CCTV use SFP uplinks?
SFP uplinks are useful when the switch must connect to a fibre backbone, a distant communications cabinet or another distribution switch. Fibre can also help separate the CCTV network from long copper runs where distance, electrical interference or building layout makes standard copper cabling unsuitable.
The active View our product has 16 Gigabit PoE+ ports, a listed maximum PoE budget of 192 W and two SFP ports. This combination is useful where a medium-sized camera system needs both PoE capacity and fibre-ready uplinks.
Managed or unmanaged PoE switch?
An unmanaged switch can be appropriate for a small, straightforward camera installation where the network is simple and there is no requirement for VLANs, traffic monitoring or remote configuration.
A managed or smart switch provides more control. Features worth considering for CCTV include:
- VLAN support for separating cameras from office devices
- QoS for prioritising video or other critical traffic
- IGMP snooping for multicast applications
- Port mirroring and traffic monitoring
- PoE port priority and overload protection
- PoE auto-recovery or watchdog functions
- Remote web-based configuration
The active Dahua View our product is listed as a Layer 2 management switch with a 190 W PoE budget, PoE, PoE+ and Hi-PoE support, web management and PoE event statistics. It also lists 2GE combo SFP connectivity and long-distance PoE transmission up to 250 m when used with compatible equipment.
Distance, cable type and extended PoE modes
Standard copper Ethernet runs are normally planned around a maximum channel length of 100 m, subject to the cable system, connectors, installation quality and network standard being used.
Some surveillance switches provide vendor-specific extended transmission modes. These can be useful for cameras installed across large sites, but they are not a substitute for checking compatibility. Confirm the supported camera, switch mode, cable type and expected bandwidth before using an extended-distance feature.
The active UniView NSW2010-26GT2GC-POE-IN listing includes an Extend or Surveillance mode with transmission distance up to 250 m. The Dahua PFS4218-16ET-190 listing also identifies 250 m long-distance PoE transmission when used with compatible equipment and a suitable PoE extender.
For critical infrastructure, consider a fibre uplink, an intermediate switch or a properly designed cabinet rather than relying solely on extended copper transmission.
Product Specifications
The following active store listings provide examples across different CCTV switch sizes and feature sets. Values are taken from the available product descriptions and catalogue records. The records checked did not expose structured technical specification metafields for these products, so technical values should be confirmed against the current manufacturer datasheet before final project sign-off.
| Specification | Detail |
|---|---|
| POE-4, AAP | 4 PoE ports, IEEE 802.3af/at support, up to 30 W per port, 10/100 Mbps. Total PoE budget and uplink details are not stated in the store record. View our product |
| POE-8, AAP | 8 PoE ports, IEEE 802.3af/at support, up to 30 W per port, 10/100 Mbps. Total PoE budget and uplink details are not stated in the store record. View our product |
| TL-SG1008MP, TP-Link | 8 Gigabit RJ45 PoE+ ports, IEEE 802.3af/at support, up to 30 W per port. Detailed description lists a 126 W total PoE budget, while the product title states 124 W. Desktop or rack-mountable format, 16 Gbps switching capacity and 11.904 Mpps forwarding rate. View our product |
| TL-SG1218MPE, TP-Link | 16 Gigabit PoE+ ports, up to 30 W per port, maximum listed PoE budget of 192 W, two SFP ports, web-based management utility, QoS and IGMP snooping. Rack-mount kit included. View our product |
| PFS4218-16ET-190, Dahua | 16 PoE ports with 2GE combo SFP connectivity, 190 W PoE budget, PoE, PoE+ and Hi-PoE support, Layer 2 management, web management, PoE event statistics and listed 250 m long-distance transmission with compatible equipment. Listed weight: 3.51 kg. View our product |
| GA-AS24TPoE+, Panasonic | 26 x 10/100/1000BASE-T ports, with 24 ports supporting IEEE 802.3at PoE. Up to 30 W per port and 168 W total device power delivery. Web configuration, VLAN grouping up to 256 VLANs and IEEE 802.1p QoS support. View our product |
| TL-SG1428PE, TP-Link | 24 Gigabit PoE+ RJ45 ports, 2 Gigabit non-PoE RJ45 ports and 2 Gigabit SFP ports. Listed PoE budget of 250 W, 56 Gbps switching capacity and 41.7 Mpps forwarding rate. Easy Smart management, QoS, IGMP snooping, PoE auto-recovery, 100 to 240 V AC supply and 0 to 50°C operating temperature. View our product |
| NSW2010-26GT2GC-POE-IN, UniView | 24 x 1000 Mbps PoE ports, 2 x 1000 Mbps RJ45 ports and 2 x 1000 Mbps combo ports. Up to 30 W per PoE port, 56 Gbps switching capacity, 41.7 Mpps forwarding performance, port power prioritisation and listed 250 m Extend mode. Total PoE budget is not stated in the store record. View our product |
For a broader range of active PoE switch options, review the available models by port count, PoE budget, uplink type and management features rather than selecting by port count alone.
A practical CCTV switch sizing checklist
- Count every camera and powered network device.
- Allow spare ports for expansion and replacement equipment.
- Add the maximum power draw of all connected devices.
- Compare the total load with the switch's total PoE budget.
- Check whether cameras require 802.3af, 802.3at or a higher-power technology.
- Calculate the combined camera bitrate passing through each uplink.
- Confirm whether Gigabit, SFP or higher-speed uplinks are required.
- Check cable length and whether extended PoE mode is supported end to end.
- Choose managed features where VLANs, monitoring, QoS or PoE recovery are needed.
- Confirm the final technical values against current manufacturer documentation.
For background on the Ethernet standard family behind common PoE implementations, refer to the IEEE 802.3 Ethernet standards reference.
Need help specifying a switch for a camera project? Send the camera count, model numbers, cable distances and expected recording setup to Essential Security Supplies for a practical recommendation.
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