{"id":25210,"date":"2026-11-08T08:16:30","date_gmt":"2026-11-08T08:16:30","guid":{"rendered":"https:\/\/atalnetworks.com\/?p=25210"},"modified":"2026-11-08T08:16:30","modified_gmt":"2026-11-08T08:16:30","slug":"fixed-vs-burstable-bandwidth","status":"publish","type":"post","link":"https:\/\/atalnetworks.com\/ko\/fixed-vs-burstable-bandwidth\/","title":{"rendered":"Fixed vs Burstable Bandwidth: Which Is Better?"},"content":{"rendered":"

\uc120\uac70\ud558\ub2e4 <\/span>fixed bandwidth<\/b> when you need a set service rate and predictable bandwidth charges. Choose <\/span>burstable bandwidth<\/b> when your traffic usually runs below its occasional peaks, extra capacity is available under the plan, and you can accept changes in the bill.<\/span><\/p>\n

If your service must handle a certain rate during busy hours, start with the capacity the provider commits to deliver. A burstable plan can include guaranteed bandwidth at its base rate, with extra capacity available above that rate under separate terms.<\/span><\/p>\n

The decision comes down to three questions. What rate can you count on? How fast can the connection go? Which traffic measurements affect the bill?<\/span><\/p>\n

Fixed vs Burstable Bandwidth at a Glance<\/span><\/h2>\n\n\n\n\n\n\n\n\n\n\n
What to compare<\/b><\/th>\nFixed-rate bandwidth<\/b><\/th>\nBandwidth with a burst option<\/b><\/th>\n<\/tr>\n<\/thead>\n
Purchased rate<\/span><\/td>\nSet in the service order<\/span><\/td>\nUsually includes a base rate or billing commitment<\/span><\/td>\n<\/tr>\n
Speed above the purchased rate<\/span><\/td>\nTypically capped at the configured service rate<\/span><\/td>\nMay rise to a stated burst ceiling<\/span><\/td>\n<\/tr>\n
Capacity during congestion<\/span><\/td>\nDepends on the scope of the written guarantee<\/span><\/td>\nDepends on the guarantee for the base rate and the policy for extra capacity<\/span><\/td>\n<\/tr>\n
Monthly bandwidth charge<\/span><\/td>\nPredictable when the bandwidth component has a flat price<\/span><\/td>\nMay include overage under the billing method in the agreement<\/span><\/td>\n<\/tr>\n
Best fit<\/span><\/td>\nSteady demand, tight budgets, or workloads with a firm minimum rate<\/span><\/td>\nOccasional peaks, flexible jobs, or services that can adapt if burst capacity falls<\/span><\/td>\n<\/tr>\n
Main risk<\/span><\/td>\nTraffic can queue or drop if demand exceeds the configured rate<\/span><\/td>\nExtra capacity may be unavailable or cost more than expected<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Treat the table as a starting point. Ask the provider whether \u201cfixed\u201d refers to the service rate, its monthly price, or both. For example, Cologix describes a fixed bandwidth option with a cap and a separate burstable option that measures excess usage under its contract. See the Cologix service agreement in the references.<\/span><\/p>\n

What Do Fixed, Guaranteed, and Peak Bandwidth Mean?<\/span><\/h2>\n

Fixed bandwidth<\/span><\/h3>\n

Fixed bandwidth is a service provisioned at a set rate. If you buy a fixed 500 Mbps service on a 1 Gbps port, the physical interface can run at 1 Gbps while the service enforces a lower rate. The rate listed on the port and the rate purchased for the service describe different things.<\/span><\/p>\n

A flat bandwidth charge makes budgeting easier. Check whether the quote also lists a transfer allowance, setup fee, or other charges.<\/span><\/p>\n

Guaranteed bandwidth<\/span><\/h3>\n

Guaranteed bandwidth is the rate the provider commits to under specified conditions. The contract may call it the <\/span>committed information rate<\/b>, \ub610\ub294 <\/span>CIR<\/b>. Check which endpoints and traffic directions the guarantee covers, how the provider measures performance, and what remedy applies.<\/span><\/p>\n

Read the billing commitment separately. A quote may use <\/span>commit<\/span><\/i> to describe the minimum amount you pay each month. Ask the provider to state the capacity commitment and minimum billed rate in separate lines.<\/span><\/p>\n

Peak bandwidth<\/span><\/h3>\n

Peak bandwidth can mean the highest rate the provider configures or the highest rate you measure. Some service agreements call the configured ceiling the <\/span>peak information rate<\/b>, \ub610\ub294 <\/span>PIR<\/b>.<\/span><\/p>\n

For example, suppose a service uses a 10 Gbps port, has a 5 Gbps configured burst ceiling, and reaches 4 Gbps during a test. Those three numbers describe the interface, the service limit, and the measured result. An application may achieve a lower rate because of the network route, the remote endpoint, storage speed, or CPU load.<\/span><\/p>\n

How Does Burstable Bandwidth Work?<\/span><\/h2>\n

Suppose you buy a service with a <\/span>1 Gbps committed rate<\/b>, a <\/span>5 Gbps burst ceiling<\/b>, \uadf8\ub9ac\uace0 <\/span>10 Gbps port<\/b>. Normal traffic fits within the 1 Gbps rate. During a software release, the service may let traffic use more capacity, up to 5 Gbps, under the provider\u2019s burst policy.<\/span><\/p>\n

Ask what happens if demand rises above the ceiling. The service may queue packets, drop them, or apply another rate policy. Queued traffic can take longer to arrive. Dropped packets can require retransmission and slow down transfers. For a live stream, test what viewers experience when traffic approaches the service limit.<\/span><\/p>\n

Also ask whether burst capacity depends on spare network capacity or a time limit. <\/span>Best effort<\/b> means the provider attempts to carry the traffic without a stated performance guarantee for that portion of the service. If the workload must run at 3 Gbps during a busy period, plan around capacity covered at that rate.<\/span><\/p>\n

Cloud network bursting uses different rules<\/span><\/h3>\n

Some cloud instances can burst above a baseline using network credits. For example, AWS documents that some EC2 instances spend network I\/O credits above their baseline and return to that baseline when the credits run out. AWS describes that extra capacity as best effort. Credit rules govern available performance. A percentile charge, where offered by a carrier or host, governs the invoice. See the AWS network bandwidth documentation in the references.<\/span><\/p>\n

How Does 95th-Percentile Bandwidth Billing Work?<\/span><\/h2>\n

Some providers use the <\/span>95th percentile<\/b> to bill bandwidth. In one common model, the provider samples traffic at regular intervals, sorts the readings from highest to lowest, and removes the highest 5%. The highest remaining reading determines the billable rate.<\/span><\/p>\n

If the agreement includes a base charge and bills only the amount above the commitment, use this formula:<\/span><\/p>\n

Monthly bandwidth charge = base charge + max(0, billable Mbps \u2212 committed Mbps) \u00d7 overage price per Mbps<\/b><\/p>\n

Use the provider\u2019s method to calculate billable Mbps. One service may calculate a percentile for each direction and use the larger result. Another may pick the larger direction for each interval before it sorts the readings. Those methods can produce different results if uploads and downloads peak at different times. For multiple ports, confirm whether the provider combines the readings before calculating the percentile or bills each port separately. See the Console Connect, Rackspace, and Zenlayer documentation in the references.<\/span><\/p>\n

Same 4 Gbps peak, different bill<\/span><\/h3>\n

Consider a fictional 30-day billing period with one traffic direction, a complete set of 8,640 five-minute samples, and these terms:<\/span><\/p>\n