Fixed Line Broadband Performance (ADSL) in New Zealand. April June 2013

Transcription

1 Fixed Line Broadband Performance (ADSL) in New Zealand April June 213

3 Fixed Line Broadband Performance (ADSL) in New Zealand, April to June 213 TABLE OF CONTENTS EXECUTIVE SUMMARY... 4 INTRODUCTION... 5 METHODOLOGY... 6 FINDINGS FIXED LINE BROADBAND PERFORMANCE... 7 CONCLUSION GLOSSARY TECHNICAL TESTING METHODOLOGY

4 EXECUTIVE SUMMARY Epitiro has maintained a system of probes measuring the performance of fixed line ADSL broadband in New Zealand since 27. These probes provide key performance indicators (KPIs) on the metrics affecting the quality of service experienced by customers of the major NZ service providers. This report provides a top-down analysis of the main KPIs in the data collected during the quarter from April to June 213. Services subscribed have traditionally been from the top 5 ISPs in the NZ marketplace; Orcon, Slingshot, Telecom, TelstraClear and. The probes on TelstraClear services have remained in place while that network is integrated with subsequent to their takeover. For this report the results from these probes have been aggregated with those from probes. The following key points were determined; Overall average upload speeds were found to be.85 Mbps. Overall average latency across both national and international URLs was 138 ms. Overall average web page download speed was 2.2 Mbps. A summary of the overall average performance observed for some of the primary KPIs by ISP is presented in Table 1 below. The combined /TelstraClear networks have the best average results: The fastest average download speed of 1.9 Mbps. The fastest average upload speed of.9 Mbps The lowest average ping time of 132 ms. The fastest average web page downloads at 2.26 Mbps. Overall average download speeds of 1.4 Mbps were observed. Table 1: Summary of average performance by KPI and ISP Download Speed Upload Speed Network Latency Web Page Download Speed Orcon 9.55 Mbps.78 Mbps 14 ms 1.87 Mbps Slingshot 1.17 Mbps.88 Mbps 137 ms 2.11 Mbps Telecom 9.57 Mbps.83 Mbps 144 ms 1.82 Mbps 1.88 Mbps.9 Mbps 132 ms 2.26 Mbps Average 1.4 Mbps.85 Mbps 138 ms 2.2 Mbps 4

5 INTRODUCTION Since 2 Epitiro has measured broadband performance and regularly published studies examining numerous key performance indicators (KPIs) that affect the quality of experience of those services. Epitiro internationally provides services and broadband performance data to ISPs, industry bodies and telecommunication regulators for benchmarking, service assurance and customer experience management purposes. Epitiro has deployed its ISP-I technology platform in New Zealand since 27 enabling measurements of broadband services from the customer experience perspective at specifically selected locations nationwide. The data collected has been provided to, amongst others, the Commerce Commission as the basis of its periodic published reports. This report provides a top-down analysis of recent results collected over the quarter from April to June 213. Although new broadband technologies such as VDSL and UFB fibre are starting to become available, the prevalent installed base for city central and suburban locations continues to run on ADSL connections delivered over copper telephone lines often referred to as the local loop or last mile. typically degrades by at least 5% beyond around 2 Km of copper line. As the deployment has matured ISPs have continued to optimise their networks to make further incremental improvements. Notably Telecom embarked on a program of deploying roadside cabinets to shorten local loop lengths. Following the structural separation of Telecom in November 211, Chorus now owns and operates what used to be Telecom's ADSL network. Since the introduction of local loop unbundling all ISP s have been able to install their own equipment into Chorus exchanges and provision their own backhaul arrangements to their core networks. Epitiro sites are at distances from their local exchanges that represent the mid to upper range of user experience for ADSL2+ connections. This report provides a comparative study of the service provided by the four major ISPs in New Zealand to its test locations between April and June 213. Since Epitiro commenced monitoring in New Zealand there have been some significant changes affecting ADSL broadband. Firstly the upgrade to ADSL2+ that commenced in 27 has seen the networks reach a peak in the performance available from that technology; ADSL2+ has a theoretical limitation for maximum speeds of 24 Mbps download and 1.4 Mbps upload. In practice these speeds can only be attained in exceptional circumstances because signal attenuation on the lines increases with distance; performance 5

6 METHODOLOGY SCOPE OF TESTING This study of fixed line ADSL broadband services in New Zealand analyses the data collected from measuring the performance delivered by the four market leading ISPs; Orcon, Slingshot, Telecom and. The period covered by the report is for the quarter from April to June 213. Epitiro maintains a set of eleven test sites across the country. These are located in five of the major cities; Auckland, Hamilton, Wellington, Christchurch and Dunedin. In Auckland, Wellington and Christchurch there are two suburban sites in addition to a city central location. The sites are at variable distances from their local exchanges but are typically within 1.8 km, some as close as.5 km. The probes are all connected to their local exchange via the local copper loop using the currently prevalent ADSL2+ technology for broadband. Results from cable connections are specifically excluded from this report. APPROACH AND METHODOLOGY The probes at each site are identical in every respect; hardware, software and internet connection device. Each site is an environment fully managed by Epitiro with 24/7 monitoring to ensure continuous optimal service. This approach ensures the results are a fair reflection of ISP s network performance at each site where all the end user variables, modem, distance from exchange etc, are equalised as far as possible. been used wherever available. Unless otherwise stated the results for each metric presented in this report include both Chorus Wholesale (UBA) and UCLL line performance. Since there is some variation in the defaults set by the ISPs for plans each connection is specifically requested to be set with interleaving off for consistency. The probes are configured to run a standardised test sequence every 15 minutes 24/7. The test sequence carries out a series of measurements to establish the key performance indicators (KPIs). These metrics include: TCP Throughput Tests. These provide an indication of the overall speed of the connection both for downloads and uploads. Latency Tests. A set of URLs both local and international are tested with an ICMP Ping to establish packet round trip times. HTTP Download Tests. Requests are sent to a set of local and international web sites. The web page download speed is then derived from the time taken and the amount of data received for each. A detailed description of the testing methodology that resulted in the individual measurements is presented in the Technical Testing Methodology section at the end of this report. Each probe is provisioned with the premium consumer full speed plan offered by each ISP. Unbundled lines where the ISP s own equipment is present at the exchange have 6

7 Mbps FINDINGS FIXED LINE BROADBAND PERFORMANCE This section analyses the results obtained from measuring the performance of the four main ADSL broadband service providers throughout the period from April to June 213 from Epitiro s 11 test locations in New Zealand. For the purposes of this study results from probes connected to the erstwhile TelstraClear-owned network have been averaged with those of the new owner,, to provide a view of the combined networks that are still in a process of integration. THROUGHPUT SPEED Throughput speed is a measure of the rate at which data can be delivered by the broadband service to the user s device. Higher bandwidth applications, such as video and audio applications, benefit significantly from faster throughput speeds. During the testing conducted in this study, throughput speed was measured from the test probes at the city central sites to an Epitiro server connected at the Auckland Peering Exchange. The server was managed and monitored by Epitiro throughout the testing and is attached to bandwidth dedicated to the purpose of throughput measurement. The overall average download speeds recorded for each ISP across all sites are shown in Figure 1. The average download speed measured across all ISPs was 1.4 Mbps. delivered the fastest download speeds with an average of 1.88 Mbps, which was 7% faster than the average measured for Slingshot, 13.7% faster than Telecom and 13.9% faster than Orcon. Figure 1: Overall average download speed by ISP Orcon Slingshot Telecom Average 7

8 Mbps Mbps In Figure 2 these results are broken down across the 3 months of the study to provide a view of how much variation has been observed across the period. ISPs constantly adjust their networks for changing conditions; response to loading, equipment improvements and tuning, bandwidth provisioning etc. The Orcon network demonstrated an improvement of 6% between its June and April results. also showed a slight uplift of.6%. Both Slingshot and Telecom reported lower download speeds in June compared to April, -.9% and -2% respectively even though both showed improvement in May. Figure 2: Overall average download speed by ISP for quarter Apr May June Orcon Slingshot Telecom The overall averages for each ISP will inevitably show considerable variation when viewed by site because of the differences in the distance of each site to its local exchange. The furthest sites experience the greatest line attenuations and therefore the lowest modem synchronisation speeds; this is a limiting factor on the attainable download throughput speeds. However, since this factor affects each ISP equally, similar relative performances would be expected. This is examined in Figure 3. Figure 3: Average download speed by ISP for each site Auckland Christchurch Dunedin Hamilton Wellington Orcon Slingshot Telecom As shown in Figure 3, distance dependent variability is indeed observed although remains the market leader in every location measured except Hamilton where it is a close second. 8

9 Mbps It is important to note that the results presented for each city do not indicate, for instance, that speeds in Hamilton are generally much higher than Christchurch. It is the benchmarked relativity between the service providers at each location that is significant. Another factor influencing the performance at different sites is the availability of UCLL connections. With unbundled connections (rather than resold Chorus Bitstream connections) the service is provided via the ISP s own equipment, the exchange DSLAMs terminating the copper lines and across the ISP s own backhaul arrangements to their core networks. Figure 4 shows the relative performances of UBA and UCLL services for TCP average download speeds for the Auckland Central site. Auckland is the only location where it is possible to make this comparison in the data since there is not full representation of both connection types for all ISPs at the exchanges local to other Epitiro sites. Figure 4: Overall average download speed by ISP for connection types in Auckland Orcon Bitstream Orcon UCLL Slingshot Bitstream Slingshot UCLL Telecom Bitstream Bitstream UCLL Although limited in scope, this does indicate that indeed some improvement in service is present on the UCLL connections for all ISPs. The largest of 82% was observed for Orcon. had a 4% improvement and Slingshot 38%. TCP upload speeds are of increasing importance for users for such applications as uploading files to social media, video communications such as Skype and online backup. ADSL services are by definition asymmetric and provide much lower rate links in the upstream direction. The maximum theoretical rate for ADSL2+ is limited to 1.4 Mbps. The overall average upload speeds recorded for each ISP across all sites are shown in Figure 5. The average upload speed measured across all ISPs was.85 Mbps. delivered the fastest upload speeds with an average of.9 Mbps, which was 2.3% faster than the average measured for Slingshot, 8.4% faster than Telecom and 15.4% faster than Orcon. 9

10 Mbps Mbps Figure 5: Overall average upload speed by ISP Orcon Slingshot Telecom Average Across the quarter under review, both Telecom and Slingshot demonstrated a slight improvement in average upload speed of 1.2% and 1.1% respectively whereas and Orcon showed slight drops of -1.1% and -1.3%. These are shown in Figure 6. Figure 6: Overall average upload speed by ISP for quarter Apr May June Orcon Slingshot Telecom Viewing upload speeds across the five city centres as in Figure 7 shows them to be less variable than download speeds. 1

11 Milliseconds Mbps Figure 7: Average upload speed by ISP for each site Orcon Slingshot Telecom Auckland Christchurch Dunedin Hamilton Wellington NETWORK LATENCY The latency or delay in the network is measured as the time taken to deliver a single packet of data across that network. The latency measures in this analysis are network round-trip times, and indicate the time for data to be transmitted from the probe, to the targeted server and back again. Low latency is critical for an acceptable user experience of real-time applications such as voice and gaming. It is also a key factor in the experience for web browsing where the delivery of a complete web page involves multiple requests from the user s browser. The average network latency measured across the four ISPs for the complete set of servers pinged was 138 ms as shown in Figure 8. The lowest network latency was observed on the network, with an average of 132 ms. Figure 8: Average latency by ISP Orcon Slingshot Telecom Average Figure 9 provides a view of how the overall latency results varied across the quarter under review. maintained a consistent low of 132 ms. Slingshot showed a 4% improvement. Both 11

12 Milliseconds Milliseconds Telecom and Orcon showed increases of 4% and 5% respectively comparing their June results with April. Figure 9: Overall average latency by ISP for quarter Orcon Slingshot Telecom Apr May June There is inevitably a major variation between the latencies observed to locations within New Zealand to international ones; latency increases with the length of links and the number of hops between routers encountered. The following chart, Figure 1, shows the average for national latency results to be 23 ms. The results between ISPs only vary within a range of 5 ms with the lowest value of 21 ms observed on the network. Over the quarter these results remained very stable varying by only a millisecond for each ISP. Figure 1: Average latency by ISP to national URLs Orcon Slingshot Telecom Average When these results are further broken down by city as in Figure 11 the effect of backhaul to Auckland where the ISP s house their core networks may be discernible; average latencies increase the further from Auckland ranging from an average of 14 ms in Auckland to 41 ms for Dunedin. 12

13 Milliseconds Milliseconds Figure 11: Average latency by ISP to national URLs by city Orcon Slingshot Telecom Figure 12 shows the average latencies recorded for the set of international servers. These represent the major contributors to the overall averages for latency. The variations between ISPs evident here will be influenced their differing international connectivity arrangements but at most differ from the average by 8 ms. The lowest value was recorded for. Figure 12: Average latency by ISP to international URLs Orcon Slingshot Telecom Average Across the quarter some variations were seen in the latency results for international URLs which, given the overall stability of those for national ones, is the factor resulting the differences in the overall averages as shown in Figure 9. 13

14 Mbps Mbps WEB PAGE DOWNLOAD SPEED Web page download speeds are measured by sending requests to a set of national and international web sites. The speed is calculated by taking the amount of data received and dividing it by the time taken to download it. The overall averages obtained from the web page download tests are shown in Figure 13. The average web page download speed measured across all ISPs was 2.2 Mbps. delivered the fastest download speeds with an average of 2.26 Mbps, which was 7.1% faster than the average measured for Slingshot, 2.9% faster than Orcon and 24.2% faster than Telecom. Figure 13: Overall average web page download speed by ISP Orcon Slingshot Telecom Average Average web page download speeds remained relatively constant across the three months reviewed as seen in Figure 14. No results for any ISP varied by more than.1% across the period. Figure 14: Average web page download speed by ISP for quarter Orcon Slingshot Telecom.5 Apr May June There is inevitably a difference between the web page download speeds attained for sites hosted in NZ to international ones. Figure 15 shows the average HTTP download speeds for NZ websites. An 14

15 Mbps Mbps overall average of 3.46 Mbps was observed. was 9.5% better than average with Slingshot 3.2%; Orcon was 2.6% below average and Telecom 1.1%. Figure 15: Average web page download speeds from NZ websites Orcon Slingshot Telecom Average A somewhat broader range was observed for international websites where the overall average download speed of 1.6 Mbps was recorded. As shown in Figure 16 was 17.9% better than average and Slingshot 9.4% while Telecom was 9.4% below average and Orcon 17.9%. Figure 16: Average web page download speeds from international websites Orcon Slingshot Telecom Average It would be expected the additional latency involved in backhaul to Auckland would result in slightly lower web page download speeds for cities down the county. This influence is evident in the results shown in Figure

16 Mbps Mbps Figure 17: Average web page download speeds from NZ websites by city Orcon Slingshot Telecom 1 Auckland Christchurch Dunedin Hamilton Wellington Another factor for consideration with web page download is time of day. ISPs have to manage their bandwidth provisioning carefully to accommodate the differences in network loading as more users are connected through the day. The number of people online typically increases in the afternoon and into the evening so increasing contention for available bandwidth. Figure 18 provides a view of HTTP download speeds averaged across 24 hours for the entire period of the report. Figure 18: 24 hour average web page download speeds Orcon Slingshot Telecom This does show evidence of some network loading through the day. The most consistent delivery was from observed from Telecom with only 3% variation between the maximum and minimum average download speeds. Slingshot showed 9%, 1% and Orcon 1%. consistently showed the best average web page download speeds regardless of time of day. 16

17 CONCLUSION In 213 New Zealand has seen the introduction of new kinds of broadband services including VDSL over copper lines and UFB fibre connections. However, as of this report, ADSL remains the primary broadband delivery mechanism for the majority of end users. This report indicates that variability of ADSL service levels between ISPs exists. Across the quarter reviewed, from April to June 213, the relative performance of each ISP remained quite consistent indicating that no major changes had been introduced affecting the city central and suburban sites for the Epitiro test locations. The overall best performance for TCP throughput speeds, latency and webpage downloads was observed from the averaged results of the combined set of probes for the and erstwhile TelstraClear networks: An overall average for web page downloads of 2.2 Mbps was observed. again achieved the best performance, 11.9% better than average. For national sites it attained 9.5% better than the average of 3.46 Mbps and 17.9% better than the 1.6 Mbps average for international sites. Slingshot was also above average for both. The least variability for web page delivery across the hours of the day was observed on the Telecom network with only a 3% difference between the maximum and minimum values. consistently delivered the best average web page download speeds throughout the day despite the variability. The challenge will remain for ISPs to continue to maintain and improve the level of service available for New Zealand consumers. An overall average for download speed of 1.4 Mbps was observed. showed the best performance, 8.4% better than average. Slingshot was also above average. The overall average for upload speed was.85 Mbps. attained 5.8% better than average. Slingshot was also above average. The overall average for latency was 138 ms across national and international sites. had the best overall performance, 4.3% better than average. This remained the case when latency to national sites is considered where it attained 8.7% below, i.e. better, than the average of 23ms and 4.1% better than average of 195 ms for international sites. Slingshot was also below average for both. 17

18 GLOSSARY ADSL: Asymmetric digital subscriber line. The standard deployed in New Zealand is ADSL2+. Bitstream: Broadband service provided by Chorus for Telecom connections and to other ISPs where they do not have their own presence at local exchanges. Contention: A slowdown in performance caused when multiple users share the same limited bandwidth. Download speed: The rate of data transmission from a network operator s access node to a customer, typically measured in Megabits per second (Mbps). Headline speed: The speed at which a broadband service is marketed. ISP: Internet Service Provider kbps: Kilobits per second. 1,kbps is the same as 1Mbps. Latency: The time it takes a single packet of data to travel from a user s device to a third-party server and back again. Most commonly measured in milliseconds. LLU: Local Loop Unbundling refers to the provision for ISPs to locate their own equipment at exchanges. Mbps: Megabits per second. 1Mbps is the equivalent of 1,kbps. UBA: Unbundled Bitstream Access. UCLL: Unbundled Copper Local Loop. UFB: Ultra Fast Broadband. Government backed initiative to rollout a nationwide fibre network. Upload speed: The rate of data transmission from a customer s connection to a network operator s access node, typically measured in per second (Mbps). VDSL: Very-high-bit-rate digital subscriber line. 18

19 TECHNICAL TESTING METHODOLOGY This section provides details of the ISP-I metrics utilised in this report. TCP THROUGHPUT MEASUREMENTS TCP throughput tests are initiated from ISP-I probes at a raw socket level with the aim of testing the full capacity of the line under test. The tests are typically conducted to a server endpoint also running Epitiro software. An endpoint server hosted in Auckland and connected at the Auckland Peering Exchange on bandwidth dedicated to the purpose was employed for the throughput testing presented in this report. to measuring HTTP performance, as slow responding websites, or sites with a large amount of data, are given a representative value. The higher this value, the better the connection has performed. As with Ping, a consistent set of local and international websites were measured throughout the test period.. When a test is connected data is transmitted upstream from ISP-I to server and then downstream from server to ISP-I in order to measure both upstream and downstream throughputs. ISP-I records the time spent transmitting data upstream and downstream and also the amount of data received in each direction. The upstream and downstream TCP throughputs are then derived from these measures. Samples were taken at regular intervals during transmission to provide a measure of the sustained average throughput. LATENCY MEASUREMENTS The Ping test measures network latency by sending an ICMP echo request to the specified server. The time recorded by ISP-I is the total round trip time (in milliseconds) from the request to the echo response being received from the server. The selection of local and international URLs which were pinged for the purposes of this report remained constant throughout the test period. HTTP MEASUREMENTS The HTTP test makes a request to a specified URL and records the time taken and the amount of data downloaded, from which the speed of the download is derived. This methodology ensures a consistent approach 19

20 Epitiro Group Ltd Epitiro House, 1/11 Raleigh Walk, Waterfront 2, Brigantine Place Cardiff, UK CF1 4LN Tel: +44 ()