There is no single universal FTTP latency number. A useful baseline must state the round-trip endpoints, whether the path was idle or carrying traffic, the statistic and observation window, the geography and service tested, and the accompanying packet-loss and jitter results. Published figures are observations from particular tests, not guarantees for every fibre connection.
This guide shows how to build a defensible baseline, interpret published measurements, and avoid mistaking a local access result for end-to-end application performance.
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What an FTTP latency baseline actually measures
Latency is delay. Ofcom defines it as the time for a packet to travel to a third-party server and back, which makes the common measurement a round-trip time (RTT). RTT is not automatically the delay of the fibre access loop alone. It can include the customer premises equipment, access network, aggregation, provider core, peering, transit, the remote network and the return path.
For that reason, the phrase “FTTP latency” is incomplete unless the measurement boundary is named. A test from a wired device to the residential gateway describes the home network. A test from the customer connection to a provider’s local point of presence (PoP) includes the access and provider path to that PoP. A test to an application server measures the complete route to that server and back.
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RTT versus one-way delay
Most consumer tools report RTT because both endpoints can measure elapsed time without synchronized clocks. One-way delay requires accurate clock synchronization and a defined direction, so it should not be inferred by halving an RTT value. Forward and return paths can differ, and queueing can affect them differently.
Access-segment delay is only one component
ITU-T G.9930 describes the residential gateway as the access-network termination point and the starting point of the in-premises network. It says the described in-premises fibre network is intended to provide better latency and jitter than non-fibre home networks, but its scope excludes both the access-network technology and the home technology connecting to an end-user device. It therefore does not provide a universal FTTP access-segment latency target.
Why published FTTP numbers cannot be treated as a universal target
Two tests can both be labelled “latency” while measuring different paths and conditions. A local provider PoP is geographically close and usually avoids much of the public internet. A distant application endpoint adds long-haul fibre, peering and transit. An idle test shows propagation and lightly loaded forwarding; a loaded test exposes queueing and buffer behaviour. A single ping, a median over an hour and a 24-hour average answer different questions.
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Provider package, access technology, geography, endpoint selection, time of day, household traffic and the test device all change the result. Fibre to the premises removes the last-mile copper segment, but it does not control the rest of the route or the in-home wireless hop. Download speed is a separate capacity measure and is not a proxy for latency.
Reference measurements and their exact scope
The following figures are useful reference observations only. Keep the stated endpoint, geography, date and statistic attached to each number when quoting it.
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| Source and date | Geography and service | Endpoint and metric | Condition and statistic | Reported result | What it does not establish |
|---|---|---|---|---|---|
| Ofcom technical report, measurements from March 2021 | United Kingdom; three BT full-fibre packages | RTT to a third-party server | Median of average latency values calculated over 24 hours | 6.4–6.9 ms | A universal FTTP value, an access-loop-only delay, or a current result for every UK package |
| ACCC summary, 26 June 2024 | Australia; tested NBN fixed-line connections across technologies | Average latency for the fixed-line sample | Mean across the tested fixed-line connections | 10.7 ms | An FTTP-only mean; the summary gives no separate FTTP number |
| ACCC summary, 26 June 2024 | Australia; same NBN fixed-line sample | Packet loss, reported separately from latency | Average across tested fixed-line connections | 0.16% | An FTTP-only packet-loss rate or a guarantee for an individual line |
The ACCC summary states that FTTP had the lowest average latency and packet loss among the compared NBN fixed-line technologies, but its 10.7 ms figure is explicitly for fixed-line connections overall. Assigning that number to FTTP alone would overstate what the publication measured.
Choose the endpoint before choosing a number
Write the endpoint pair in the test record. At minimum, identify the device, gateway, provider PoP or remote server, and the location of each endpoint.
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This isolates the household path. It is useful for finding Wi-Fi contention, a poor Ethernet link, a saturated router or local buffering. It does not characterize the provider’s FTTP service.
Customer connection to a local provider PoP
IMDA’s fibre quality method calls this local RTT: test clients send traffic to provider test nodes in a local PoP. It captures the access network and nearby provider infrastructure while limiting the influence of international transit. Record the PoP location because “local” is geographic, not universal.
Customer connection to an international endpoint
IMDA distinguishes international RTT to provider test nodes in the first US PoP. This includes the domestic path plus international transport to that defined point. It should not be compared directly with a local RTT as though both represent the same segment.
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End-to-end application or server endpoint
This is the user-visible path to a game, meeting service, website or API. It is often the most relevant operational measure, but it is also the least attributable to FTTP alone. Name the server or service region and record route changes when they matter.
Separate idle latency, loaded latency, jitter and loss
A baseline should contain more than one latency value because each metric describes a different failure mode.
- Idle RTT: measured while the connection has no competing traffic. It approximates the lightly loaded path.
- Loaded latency: measured while upload, download or application-like traffic is present. The increase over idle RTT reveals queueing and buffer behaviour.
- Jitter: variation in packet delay. Two paths with the same average RTT can feel very different when one has large delay swings.
- Packet loss: packets that do not arrive or are discarded. Loss can cause retransmissions, freezes and audible gaps even when average RTT looks good.
- Throughput: the amount of data delivered per second. It should be reported separately and never used as a latency substitute.
The ACCC reports latency and packet loss as separate quality measures. ITU-T G.9930 discusses latency and jitter in its in-premises context, while ITU-T Y.1567 defines methods for measuring latency under load. ITU-T G.1051 addresses measurement and interactivity scoring with real application traffic patterns. These recommendations provide measurement frameworks, not one universal FTTP pass/fail number.
Build a repeatable FTTP baseline
Use the same endpoint class, device, wiring, schedule and traffic profile each time. A short sample can identify an obvious fault; a baseline for operations needs repeated observations across quiet and busy periods.
- Define the question and boundary. Decide whether you are characterizing the home LAN, the customer-to-local-PoP path, an international path or an application endpoint. Write the endpoint names and locations before testing.
- Record service context. Note the ISP, access technology, package, region, connection date, gateway model, firmware and whether the test device used Ethernet or Wi-Fi. Do not attribute a wireless result to FTTP without qualification.
- Use a wired test endpoint when assessing access performance. Connect the computer directly to the gateway with Ethernet. A normal Cat 6 cable is a practical way to make that connection; it does not measure latency and no cable category is endorsed by the cited standards.
- Capture an idle sample. Run a series rather than relying on one reply. On Linux or macOS, a typical sample is
ping -c 20 host.example; on Windows, useping -n 20 host.example. Replace the example with a controlled endpoint and save the timestamp, minimum, maximum, average, median or percentile you calculate, and any loss. - Capture a loaded sample separately. Generate a known upload, download or application-like workload, then repeat the latency measurement. Record the traffic direction, approximate rate, duration and whether the gateway or access link reached capacity. An idle ping must not be described as performance under use.
- Repeat across the observation window. Include quiet and peak periods when variation matters. State whether the result is one sample, a median of repeated samples, an average, a percentile or a 24-hour average. Keep the window attached to every reported value.
- Measure jitter and loss alongside RTT. Use the same packet schedule and endpoint where possible. Report loss as a percentage and describe how jitter was calculated rather than hiding it inside an average RTT.
- Preserve route context. A traceroute or equivalent can show whether a path changed, but intermediate routers may de-prioritize diagnostic packets. Treat route output as context, not as proof that one hop alone caused the application delay.
- Store raw observations. Keep timestamps, endpoint addresses or names, packet counts, results and test conditions. A later average without the raw window cannot reveal whether a short outage or evening queue was masked.
How to compare two latency baselines fairly
Before ranking providers, packages or technologies, align the comparison axes. If one axis differs, present the results as separate observations rather than declaring a winner.
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| Comparison axis | What to record | Why it changes the result |
|---|---|---|
| Endpoint and geography | Gateway, local PoP, international PoP or application server; city and country | Path length, peering and transit can dominate RTT |
| Access provider, technology and package | ISP, FTTP or another fixed technology, advertised package | Aggregation, routing and traffic engineering differ |
| Latency definition | RTT or one-way; packet size and protocol if relevant | One-way and RTT are not interchangeable |
| Traffic condition | Idle, upload-loaded, download-loaded or application-like | Queueing appears only when competing traffic is present |
| Statistic and window | Single observation, median, mean, percentile or 24-hour average | Averages can hide spikes; short samples miss diurnal variation |
| Time of day | Test schedule and peak-period coverage | Congestion and household usage vary by hour |
| Loss and jitter | Percent lost and the stated jitter method | Interactive quality depends on variation and loss as well as delay |
| Endpoint connection | Ethernet or Wi-Fi, link speed and device location | Wireless contention can be mistaken for access-network delay |
Interpreting a measured result
A low local RTT with poor application performance
This usually points beyond the local access path. Check the application server region, peering and transit, route changes, server load, loss and loaded latency. A local-PoP result cannot certify a distant service.
A good idle RTT that rises sharply under load
The increase indicates queueing somewhere between the device and endpoint. Repeat with upload and download loads separately, check whether the gateway reaches a capacity limit, and report the loaded value instead of quoting idle RTT alone.
High RTT only on Wi-Fi
Move the test device beside the gateway, use a wired link, and repeat. If Ethernet is stable while Wi-Fi varies, investigate channel contention, signal strength, retransmissions and local device load before blaming the FTTP access service.
Stable RTT with packet loss
Loss can impair calls and games even when the average delay looks acceptable. Confirm the loss at more than one endpoint and over a longer window, then check cabling, optical alarms, gateway logs and the provider handoff. Do not replace a loss percentage with a latency average.
Different results at different times
Keep the time series. A 24-hour average can be useful for a broad service view, but peak-period percentiles or separate busy and quiet samples reveal when the problem occurs. State the observation window whenever publishing the number.
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What the standards and regulator measurements establish
ITU-T Y.1567, the October 2023 recommendation listed in force, provides latency-under-load measurement methods. ITU-T G.1051, published in March 2023 with an April 2024 Appendix I revision listed in force, covers measurement and interactivity scoring under real application traffic patterns. Neither retrieved summary sets a universal numerical FTTP threshold.
IMDA’s definitions, published on its Q2 2023 page and updated 4 October 2023, demonstrate why local and international RTT must be labelled separately. Ofcom’s March 2021 UK measurements and the ACCC’s 26 June 2024 NBN summary are valuable field observations, but each applies to its stated sample and method. They should anchor a comparison, not become a promise for a different household, date or endpoint.
A reporting template for engineers and support teams
Use a compact record that lets another person reproduce the test:
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- Connection: ISP, FTTP package, region and gateway model.
- Endpoint pair: device and gateway, local PoP, international PoP or application server; include locations.
- Path definition: RTT or one-way, with packet size and protocol when relevant.
- Access to gateway: Ethernet or Wi-Fi, cable or wireless details, and device location.
- Traffic state: idle, upload-loaded, download-loaded or application-like; record workload and duration.
- Sampling: packet count, start and end timestamps, observation window, statistic and percentile if used.
- Quality metrics: minimum, median, mean, maximum or selected percentiles, jitter method and packet-loss percentage.
- Route context: endpoint name, route observations and any provider or server-side incident.
A report that omits these fields may still be useful as a troubleshooting clue, but it is not a portable benchmark. Preserve the conditions next to each number so a future test can determine whether the path, load or endpoint changed.
Practical decision rules
- Use a gateway test to diagnose the home network, not to advertise an ISP latency.
- Use a local-PoP RTT to compare access and nearby provider performance, and label the PoP.
- Use an international or application endpoint to represent a user journey, while acknowledging transit and server effects.
- Report idle and loaded latency separately whenever interactive applications are the concern.
- Pair RTT with jitter and packet loss for voice, video, gaming and remote-control workloads.
- Compare only measurements with matching endpoint class, geography, statistic, window, load state and wired or wireless setup.
- Treat published numbers as dated observations. The Ofcom range comes from March 2021, and the ACCC figures summarize a specific 2024 sample.
Bottom line
FTTP can provide a low-delay access path, but fibre technology alone does not define end-to-end latency. A credible baseline names the endpoints, geography, service, load, statistic, time window, jitter and loss. Once those conditions are explicit, measurements from a local PoP, an international endpoint and an application server can be interpreted correctly instead of being collapsed into a misleading universal “FTTP latency” figure.
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