VDSL. Product user guide
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1 VDSL Product user guide
2 Table of Contents 1 OVERVIEW Who is VDSL for? Key benefits 3 2 VDSL PRODUCT DESCRIPTION VDSL components External termination point (ETP) VDSL access Coverage area Local aggregation path Handover point Local handover point Remote handover point Handover links Backhaul Variants of VDSL Baseband Copper and Baseband IP 7 3 VDSL FEATURES Dynamic line management (DLM) Spectrum profiles Tail Extension Service specification targets Exceptions to service specifications Aggregation and handover of traffic Geographic availability Changes to coverage areas/handover points Relationship with other products Possible product combinations 10 2 VDSL Sept 2016
3 1 Overview 1.1 Who is VDSL for? Our VDSL service enables you to deliver VDSL2 powered, internet-grade broadband services. It s an intermediate input service that you can combine with your network or other services. VDSL2 is a third generation DSL technology that s suitable for people who are on optimal copper lines (typically less than m from the exchange) and is capable of delivering a significantly faster broadband experience than ADSL2+. It supports growing demands for bandwidth enabled content, such as Video on Demand (VoD) as well as small business data requirements. VDSL is suitable for those who require large upstream bandwidth or who regularly download large files or use their broadband service for multiple applications such as voice over IP, video streaming and online gaming. 1.2 Key benefits Is a transition product that will lay the foundation for future UFB fibre services. It improves the capability of current broadband services, delivering a better experience for bandwidth hungry content, such as video conferencing, home networking and automation, video applications, improved remote working and home security - all over a single broadband access. Is an intermediate input product that can be combined with your network or other service to provide differentiated solutions to your customers. Uses our next generation Ethernet network to deliver fast broadband access. Can be combined with Tail Extension to enable you to build up a local, regional or national presence without the need to invest or manage dedicated backhaul. Seamlessly integrates with handover links, allowing you to utilise the same handover links for VDSL, Enhanced UBA (EUBA) and High Speed Network Services (HSNS) traffic. It offers a greater best efforts throughput per connection than our other broadband access products. We offer no guarantee as to line speed or throughput. Features dynamic line management (DLM), which is used proactively on every VDSL port to improve individual line performance by optimising the line for speed and stability. 2 VDSL product description 3 VDSL Sept 2016
4 VDSL is an Ethernet-based bitstream product that enables you to offer your customers delivery of internet-grade, broadband services using VDSL2 technology (ITU-T Rec.G.993.2). The Service Description is the UBA STD service description. VDSL is available exclusively through Chorus. The following diagram shows the VDSL service: 2.1 VDSL components EXTERNAL TERMINATION POINT (ETP) The ETP is the external termination point for telecommunications services at an endcustomer's premises. Where there is no termination point external to the premises it is either the first jack on the premises wiring, or the building distribution frame VDSL ACCESS Our VDSL service consists of a VDSL2 data connection operating in packet transfer mode (PTM) from the ETP at the customer s premises to the DSLAM at the local exchange or cabinet. VDSL provides a single Ethernet VLAN (C-VID) between the ETP and the handover point. Your customer must be able to submit or receive 802.1q tagged frames with a VLAN address of 10 and p-bit settings based on the class of traffic (see section 4.11 technical interfaces for more information). Non-tagged, or incorrectly tagged frames will be discarded. End-customer traffic policies are enforced in this section of the network COVERAGE AREA 4 VDSL Sept 2016
5 A coverage area is the collection of DSLAMs in a geographic area connected to a handover point. Information on VDSL coverage is available from a number of sources: Network capability map on our public website. VDSL coverage is indicated by broadband > 20 mbps Chorus coverage maps - us if you require a login. Multiples report - a list of addresses of premises with multiples that may impact on our ability to deliver VDSL LOCAL AGGREGATION PATH The traffic from numerous DSLAMs in a coverage area is carried to the handover point over local aggregation paths. These paths are dimensioned to support both the best efforts traffic and (separately) the real time traffic. Real time traffic is strictly prioritised both upstream and downstream to ensure that it meets service specification targets HANDOVER POINT A handover point is our first Ethernet aggregation switch (EAS) within a coverage area, where all traffic within that coverage area is aggregated for handover. You ll require a handover link to receive the traffic in that coverage area is aggregated for handover LOCAL HANDOVER POINT In the context of Tail Extension, a local handover point is our first EAS in the coverage area in which the VDSL access tail is provided REMOTE HANDOVER POINT In the context of Tail Extension a remote handover point is an EAS located outside the coverage area that the VDSL access tail is provided. If you do not have the ability to hand the traffic over at the local handover point you can purchase Tail Extension or another backhaul service to take the VDSL traffic to your nominated remote handover point. Tail Extension is available for a number of services and has a separate service description HANDOVER LINKS The handover link is an interface between our network and your network. VDSL traffic can only be handed over on Gigabit Ethernet interfaces. 5 VDSL Sept 2016
6 A minimum of one handover point is required. It is possible to use the same handover point for all UBA Ethernet services, but it is not possible to use the same handover point for ATM services as for UBA Ethernet services. This means that, if you intend to consume a PPP/ L2TP Basic UBA connection and an ADSL or VDSL bitstream service you ll need to establish separate handover points. More information can be found in the handover links product user guide BACKHAUL If you do not have a handover link at the local handover point you can purchase Tail Extension or another backhaul service (for example the P2P backhaul service), which will terminate on a remote handover point. Local traffic and traffic from remote coverage areas may be handed to you at the same handover point. More information on backhaul options is available on the UBA Backhaul page. 2.2 Variants of VDSL The following VDSL variants are available: VDSL Boost VDSL VDSL allows the delivery of best efforts traffic only and operates at FS/FS*. Our VDSL service can be provided with or without an active telephone service on the same copper pair (such as POTS, UCLF Service, Baseband IP or Baseband Copper voice services). Voice services do not form part of the Boost VDSL service and separate charges may apply. Without voice means without an active telephone service on the same copper pair. The voice service is not provided as part of the VDSL2 service. With voice means with an active telephone service on the same copper pair. The analogue telephone service is not provided as part of the VDSL2 service and is available separately from us as an agency. With Baseband Copper means with Baseband Copper on the same copper pair to the ETP. Baseband Copper is a copper pair from the ETP to your handover delivery point in the local exchange. With Baseband IP means with Baseband IP on the same copper pair to the ETP. Baseband IP is a copper pair from the ETP to the where a copper path exists between your customer s ETP and our DSLAM. At the DSLAM voice frequencies 6 VDSL Sept 2016
7 are converted into a bitstream service and delivered to you on a VLAN at a Handover Connection at the first data switch. *FS means the maximum speed that the DSLAM can support on the end-customers line. Actual speeds may vary, depending on factors such as customer premises equipment and wiring, the presence of a VDSL2 compatible splitter, your environment, volume of traffic, location of the customer and network congestion BASEBAND COPPER AND BASEBAND IP The Baseband Copper and Baseband IP services are not provided as part of the VDSL service and are as defined in the Baseband Service Description and product user guide. 3 VDSL features VDSL has the following features: DYNAMIC LINE MANAGEMENT (DLM) DLM is an inherent feature of the VDSL product. We proactively use DLM on every VDSL port to improve individual line performance by optimising the line for speed and stability. DLM enables an iterative process that monitors and optimises the VDSL port and associated line over the lifetime of the connection as follows: DLM collects performance data from all VDSL ports on a daily basis. DLM analyses the performance data and determines whether the active VDSL line profile is optimal or not. If not, a new line profile is chosen based on the collected data and activated for that particular customer's connection. DLM is a self-learning technology: it s not a one off implementation, it continues to adapt and improve as the conditions of the line change (such as noise, house wiring changes or copper plant enhancements). Note: When the VDSL connection is provisioned, the interleaving setting will be automatically allocated and then optimised by DLM. Interleaving settings cannot be changed outside of the DLM process SPECTRUM PROFILES The spectrum profiles to be used for VDSL2 are based on use of the ITU-T G E and 998ADE17 VDSL2 profiles. The VDSL2 998E spectrum profile forms the default profile for all end-customers. 7 VDSL Sept 2016
8 The 998ADE17 spectrum profile will only be used for end-customers on short loops (an attenuation level corresponding to about 200 m or less) and will be activated by us only where this will optimise the customer experience. Note that DLM will optimise the line based on the selected spectrum profile TAIL EXTENSION Tail Extension is a backhaul service that extends a VDSL access tail from the local handover point to the remote handover point that you ve nominated. Tail Extension is a commercial, optional feature provided in accordance with the Tail Extension Service Description SERVICE SPECIFICATION TARGETS Metric Throughput Mean one way packet delay One way packet delay variation One way packet loss ration Internet CoS (1500 byte packet) 99.9% probability of providing to any provisioned end-customer a minimum uplink and downlink average throughput of 96kbps during any 15 minute period on demand. <1s Unspecified Unspecified Notes: These service specifications are design targets and should be used when developing end-to-end best efforts applications. However, VDSL will likely only form a small part of any such end-to-end application. Actual performance is not guaranteed as it is subject to external influences. The service specifications relate to the performance of VDSL from the ETP to the handover point and exclude delays such as serialisation or transcoding. Packet delay variation is measured as: PTD upper minus PTD min where PTD upper is the 99.9% Quartile of PTD in the evaluation interval and PTD min is the minimum PTD in the evaluation interval (as explained below). Packet loss ratio and delay variation will be evaluated over an interval of 15 minutes. Traffic may be policed at both an aggregate level and at an endcustomer level to ensure compliance with the service specification. To achieve the specifications of VDSL service your customer s line speed must meet the minimum thresholds EXCEPTIONS TO SERVICE SPECIFICATIONS 8 VDSL Sept 2016
9 VDSL will not be available where the line quality does not meet the required line speed threshold to deliver the service:protocol overheads Network load or other user traffic demand Constraints within either you, or your customer s domains The presence of any real time traffic on the same DSLAM The actual loading of the local aggregation path Any constraints external to VDSL2 technology or VDSL (e.g. external noise or interference) AGGREGATION AND HANDOVER OF TRAFFIC Each end-customer is located in a coverage area. The traffic from numerous DSLAMs in a coverage area is carried to the handover point over local aggregation paths, dimensioned to support the throughput rate for VDSL2 traffic. If you do not wish to (or are unable to) collect VDSL traffic from the local handover point and would like to transport the traffic to a remote handover point where you have an already established a handover link, you may do so using: Tail Extension feature, or Point to Point Backhaul, or Third party transport. You may, via handover links and/or any of the options above, connect your network to any number of handover points throughout the country. However, in order to consume VDSL you must connect to a minimum of one handover point. Please note that it s not possible to deliver all unbundled services over a single handover link. VDSL traffic can be delivered over the same handover link with other Ethernet based access tails like Enhanced UBA or HSNS (using a Shared Service Handover Connection). However, VDSL traffic cannot be shared with other non-ethernet services such as Basic UBA (which are delivered over ATM based network platforms). Please refer to the handover link product user guide for more comprehensive information on service options GEOGRAPHIC AVAILABILITY We will accept any order if the line prequalification returns a maximum of 15dB. VDSL is available where we have coverage and your customer s line speed meets the minimum thresholds. Our prequalification tool will analyse the exchange or cabinet capability and physical characteristics of the copper line serving your customer s premises and determine if that copper line is VDSL capable. We also recommend that you prequalify the circuit to determine if your customer is a suitable candidate for VDSL using the multiples report. 9 VDSL Sept 2016
10 If your customer s address appears on the multiples report they re not likely to be a suitable candidate for VDSL2 service. A multiples report user guide is also available CHANGES TO COVERAGE AREAS/HANDOVER POINTS The location of handover points and related coverage areas may change in the future as the network is rolled out. We ll give you at least one month s notice if a new coverage area is going to be introduced. We ll give you 12 months notice if the existing coverage areas and associated handover points change and those changes will have any impact on you (i.e. requiring you to install new handover points or pay backhaul charges because of the change). Coverage area mapping for Tail Extension will need to be updated as additional coverage areas are added. 3.2 Relationship with other products Our VDSL service can be combined with a number of our input products such as handover links and Commercial Colocation. You can choose to use VDSL with or without Tail Extension. VDSL traffic can also share a handover link with Enhanced UBA or High Speed Network Service (HSNS). This flexibility allows you to customise your customer s end to end service. Possible product combinations are illustrated in the figures below POSSIBLE PRODUCT COMBINATIONS 10 VDSL Sept 2016
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