Home Internet Glossary

Home Internet Terms & Definitions

20 terms defined — an authoritative reference for understanding the most important concepts in Home Internet.

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5G Home Internet

5G home internet delivers broadband over a cellular tower to a receiver in your home instead of a wired line. It installs in minutes and often skips contracts and equipment fees, but speeds depend heavily on tower distance and congestion. It is a strong option where fiber is unavailable and a weak one where it competes with fiber.

B

Bufferbloat

Bufferbloat is lag caused by oversized network buffers holding packets during heavy use, spiking latency even on fast connections. It is why a big upload can wreck a video call on the same line. Modern routers with Smart Queue Management (SQM/fq_codel) largely fix it.

C

CGNAT

Carrier-Grade NAT (CGNAT) lets an ISP share one public IP address among many customers to conserve addresses. It usually goes unnoticed, but it can break port forwarding, self-hosted servers, some game hosting, and certain VPN setups. If you need a reachable address, ask the provider for a dedicated or static public IP.

D

Data Cap

A data cap is a monthly ceiling on how much you can download and upload before the provider throttles you or bills overage fees. Caps commonly sit around 1 TB on cable plans. Most fiber providers have dropped caps entirely, which is a real advantage for 4K-streaming or multi-person households.

DOCSIS

DOCSIS (Data Over Cable Service Interface Specification) is the standard that lets cable companies deliver internet over the same coaxial lines that carry TV. DOCSIS 3.1 supports gigabit downloads but far slower uploads, which is why cable plans are almost always asymmetric. DOCSIS 4.0 narrows that gap where it is deployed.

DSL

DSL (Digital Subscriber Line) delivers internet over traditional copper phone lines. It is widely available and cheap but slow, with speed that degrades the farther you sit from the provider's equipment. Where fiber or cable exist, DSL is usually a last resort; several providers are actively retiring it.

E

Equipment Rental Fee

This recurring charge, often $10-$15 a month, covers the router or gateway the provider supplies. On cable it is usually avoidable by buying your own modem and router; on fiber the provider-owned ONT/gateway is frequently mandatory. Over a two-year plan the fee can quietly add $300 or more.

F

FTTH (Fiber to the Home)

FTTH means the fiber runs all the way to your residence, rather than to a neighborhood cabinet with copper covering the last stretch. It delivers the full symmetrical-speed and low-latency benefits of fiber. Some plans marketed as fiber are actually fiber-to-the-node, so confirm the connection reaches the building.

G

GPON

GPON (Gigabit Passive Optical Network) is the most common fiber architecture US providers use to reach homes. A single fiber strand from the provider is split among many households using passive optical splitters, which keeps deployment cheap. Real-world speeds stay high because each home rarely uses its full share at once.

J

Jitter

Jitter is the variation in latency over time. Even a fast connection feels unstable if ping bounces between 20 ms and 120 ms, causing choppy calls and rubber-banding in games. Fiber and a wired connection keep jitter low; congested Wi-Fi and bufferbloat make it worse.

L

Latency

Latency is the round-trip time, in milliseconds, for data to travel from your device to a server and back. It matters far more than raw download speed for video calls, gaming, and anything interactive. Fiber typically posts the lowest latency (often under 15 ms) because light travels through glass with little of the signal processing cable and DSL add.

M

Mbps vs MB/s

ISPs advertise speed in megabits per second (Mbps), while file sizes and download managers show megabytes per second (MB/s). Because a byte is eight bits, divide Mbps by eight to estimate MB/s: a 100 Mbps plan downloads at about 12.5 MB/s. Knowing the difference prevents thinking your plan is underperforming.

Mesh Backhaul

Backhaul is the link a mesh system uses to carry traffic between its nodes and the main router. Wired (Ethernet) backhaul is fastest and most stable; wireless backhaul is easier to set up but shares airtime with your devices. Poor backhaul, not weak coverage, is the usual reason a mesh network feels slow.

Multi-Gig

Multi-gig plans deliver speeds above 1 Gbps, commonly 2, 5, or even 8 Gbps, and are increasingly offered by fiber providers. Realizing them requires matching hardware: a multi-gig ONT, router, Ethernet cabling, and network cards. For most households a 1 Gbps plan is still plenty; multi-gig suits heavy simultaneous uploaders.

O

ONT (Optical Network Terminal)

The ONT is the box that converts the fiber light signal into an Ethernet signal your router can use. On fiber plans it replaces the cable modem. It is usually provider-installed and provider-owned, so unlike a cable modem you generally cannot buy your own to skip a rental fee.

P

Price Lock

A price lock guarantees your monthly rate will not rise for a set period, or in some fiber plans for as long as you keep the service. It protects you from the steep post-promo increases common on cable. Read whether the lock covers only the base rate or the full bill including fees.

S

Symmetrical Speed

A symmetrical connection uploads as fast as it downloads (for example 1 Gbps down and 1 Gbps up). Fiber is the only widely available technology that delivers this. It matters for large file uploads, cloud backups, video conferencing, and streaming, where cable's slow upload becomes the bottleneck.

T

Throttling

Throttling is a provider intentionally slowing your connection, usually after you pass a data cap or during network congestion. Some plans also throttle specific traffic like video. A truly unlimited, non-throttled plan is worth confirming in writing if you stream heavily or work from home.

W

Wi-Fi 6

Wi-Fi 6 (802.11ax) is the wireless standard that improves performance in homes with many devices, not just peak speed for one. Features like OFDMA and better scheduling reduce congestion when phones, TVs, and smart-home gear all compete. A Wi-Fi 6 router is worth it once you pass roughly a dozen connected devices.

Wi-Fi 6E

Wi-Fi 6E extends Wi-Fi 6 into the newly opened 6 GHz band, giving compatible devices a wide, interference-free lane. It shines for gigabit-plus fiber plans where the older 5 GHz band becomes the bottleneck. Both the router and your devices must support 6E to benefit.