Chorus UBA Specification sheet

Enhanced UBA
Product user guide
Click here to edit Document Version: May 2016
© Chorus 2016

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Table of Contents
1INTRODUCTION 5
2BENEFITS 5
2.1 Key benefits of Enhanced UBA: 5
3ENHANCED UBA PRODUCT DESCRIPTION 5
4ENHANCED UBA COMPONENTS 7
4.1 External termination point 7
4.2 Enhanced UBA access 7
4.3 Coverage area 7
4.4 Local aggregation path 8
4.5 Handover point 8
4.6 Local handover point 8
4.7 Remote handover point 8
4.8 Handover link 8
4.9 Backhaul 8
5VARIANTS OF ENHANCED UBA 9
6ENHANCED UBA FEATURES 9
6.1 Interleaving 9
6.2 Interleaving settings for Enhanced UBA O 10
6.3 PPPoA modem support 10
6.4 Tail Extension 11
7SERVICE SPECIFICATION TARGETS 11
7.1 Exceptions to service specifications 13
8AGGREGATION AND HANDOVER OF TRAFFIC 13
8.1 Geographic availability 14
8.2 Modem installation 14
8.3 Relationship with other products 15
9HOW ENHANCED UBA WORKS 16
9.1 Class of service design 16
9.2 Enhanced UBA protocol stack 18
9.3 Enhanced UBA Ethernet architecture 19
9.4 Traffic Management 22
9.5 PPPoA modem support 24
9.6 Tail Extension 25
9.7 IP addressing 26

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9.8 DHCP option 82 features 27
9.8.1 Port ID 27
9.8.2 Port ID mismatch 27
9.8.3 Upstream speed 28
9.8.4 Downstream speed 28
9.9 Service component identifiers 28
9.10 Security 29
9.11 Technical interfaces 29
9.12 End customer interface 29
9.13 End customer interface security settings 31
9.14 Service provider interface 31
9.14.1 Service provider interface for PPPoA modem support 33
9.14.2 Service provider interface security settings 34
9.14.3 Handover links cable standards 34
10 ONBOARDING TO ENHANCED UBA 35
10.1 Prerequisites 35
10.2 Enhanced UBA set-up guide 35
10.3 Coverage area mapping and remapping 36
10.4 Mapping and remapping process service level agreement 36
10.5 Coverage area mapping process 37
10.6 Mapping process charge 37
10.7 Remapping process 37
10.8 Remapping process charge 39
11 ORDERING 39
11.1 Enhanced UBA service requests 39
12 FAULTS 41
12.1 Fault definitions 41
12.1.1 Modem re-sync fault definition 41
12.1.2 Service provider tier 1 testing 42
13 PRICING 43
13.1 Monthly rental 43
13.2 Transaction Charges 43
13.3 Ancilliary charges 44
13.4 Additional services 44
13.5 Tail Extension pricing 44
13.6 Coverage area mapping / remapping charges 44
13.6.1 Coverage area remapping charges 44
14 BILLING 45
14.1 Tail Extension billing 45

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14.2 Other Chorus services 46
15 CONNECTION AND PREMISES NETWORKING 46
15.1 Connection option tasks 47
16 END CUSTOMER EQUIPMENT REQUIREMENTS 48
16.1 Overview 48
16.2 Key capabilities 48
16.3 CPE requirements 49

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1Introduction
With Enhanced UBA you can provide your customers with a range of own-branded,
broadband enabled services and applications such as voice over internet protocol (VoIP)
and internet access.
The Basic UBA variant EUBA 0 can be found described in this product user guide.
2Benefits
2.1 Key benefits of Enhanced UBA:
Allows simultaneous delivery of internet and real time grade IP traffic over a
single broadband access.
Is the foundational product for delivery of next generation solutions to the home,
such as video conferencing, home networking and automation, video applications,
improved remote working and home security - all over a single broadband access
to the home.
Is an intermediate input product that can be combined with your network (or
other service) to provide differentiated solutions to your customers.
Can be used as an alternative to the PSTN.
Uses our Ethernet network to deliver fast broadband access.
PPPoA modem support feature enables a smooth transition with no interruption of
service for end customers moving from current generation broadband products to
Enhanced UBA.
Tail Extension feature enables you to build up a local, regional or national
presence without the need to invest or manage dedicated backhaul.
Integrated with handover links to allow you to utilise the same handover links for
Enhanced UBA and High Speed Network Services (HSNS) traffic.
3Enhanced UBA product description
Enhanced UBA is the first in a new family of Ethernet delivered next generation
broadband products, designed to support the simultaneous delivery of two Class of
Service (Cos) streams:
Real time grade IP traffic: delivered as a real time CoS internet grade IP traffic:
delivered as ‘best efforts’ CoS.

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Enhanced UBA is an intermediate input service that you can combine with your own
network, or other services, to provide a range of own-branded broadband enabled
services and applications such as voice over internet protocol (VoIP) and internet access.
It is designed to serve your customers with either single or multiple access devices such
as computers, consoles or telephones.
Enhanced UBA is available to you exclusively through Chorus.
Enhanced UBA is available nationally where Chorus has deployed ADSL2+ based
technology with terrestrial access and backhaul assets (i.e. it excludes services
supported by satellite and/or wireless access links or backhaul links). Enhanced UBA can
only be provided if your customer’s line speed meets the minimum thresholds required
to deliver the Enhanced UBA service.
The following diagram shows the Enhanced UBA service:
Figure 1: Enhanced UBA Service

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4Enhanced UBA components
Enhanced UBA is made up of the key components shown below:
Figure 2: Enhanced UBA Service
4.1 External termination point
The ETP is the external termination point for telecommunications services at your
customer'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.
4.2 Enhanced UBA access
Enhanced UBA consists of a DSL data connection from the ETP at your customer’s
premises to the DSLAM at the local exchange or cabinet. While Enhanced UBA is
optimised for ADSL2+, it is possible to use ADSL1 modems (see section 11 ‘end
customer equipment requirements’ for more information).
This is a bridged Ethernet connection that requires the use of 802.1q frames with a VLAN
address of 10 and p-bit settings based on the class of traffic (see the section on technical
interfaces for more information). Non-tagged frames will be discarded.
Per end customer traffic policies are enforced in this section of the network. Further
detail on traffic management is provided in section 4.4.
4.3 Coverage area
A Coverage area is the collection of DSLAMs in a geographic area connected to a
handover point. More information on Enhanced UBA coverage is available on the EUBA
page of our website.

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4.4 Local aggregation path
The end customer 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 real time traffic meets your service specification targets.
4.5 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 will need a
handover link to receive the traffic.
4.6 Local handover point
In the context of Tail Extension a local handover point is our first EAS in the coverage
area in which the Enhanced UBA access tail is provided.
4.7 Remote handover point
In the context of Tail Extension a Remote handover point is an EAS located in a coverage
area which is not the coverage area in which the Enhanced UBA access tail is provided.
If you don’t have the ability to hand over traffic at the local handover point you can
purchase Tail Extension (or another backhaul service) to take the Enhanced UBA traffic
to a remote handover point that you’ve nominated.
4.8 Handover link
The handover link is an interface between our network and yours. Enhanced UBA traffic
can be handed over only on Gigabit Ethernet interfaces.
4.9 Backhaul
If you don’t have a handover link at the local handover point you can purchase Tail
Extension or another 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 Tail Extension is available in section 4.6.

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More information on backhaul options is available on the secure section of Chorus’s
website http://customer.chorus.co.nz/backhaul.
5Variants of Enhanced UBA
Enhanced UBA operates at FS/FS, which is the maximum speed that the DSLAM can
support on the end customer’s line (whether upstream or downstream). Actual speeds
may vary, depending on factors such as CPE and wiring, your environment, volume of
traffic, end customer location and network congestion.
It has four variants provided under the terms of the UBA STD:
•Best efforts only
•EUBA 0kbps
oBest efforts
•EUBA 40kbps
oEUBA 90kbps
oEUBA 180kbps
The real time bandwidth allowance is designed to support industry standard VoIP codecs,
including protocol overheads such as RTP, UDP, IP and Ethernet.
For example Enhanced UBA 40 is suitable for G.729 Annexes A,B,C,D,E,F,G,H,I at 10ms
or higher packetisation rates. Enhanced UBA 90 is suitable for G.711 codec.
All four variants of Enhanced UBA can be provided with a voice service, such as
Baseband. However, the Baseband Copper and Baseband IP services are not provided as
part of the Enhanced UBA service and are as defined in the Baseband Service Description
and product user guide.
6Enhanced UBA Features
Enhanced UBA has three optional features:
6.1 Interleaving
For each Enhanced UBA variant ordered you will elect whether that connection will be
provisioned with interleaving HIGH, interleaving LOW or interleaving OFF.

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The default setting for Enhanced UBA is to have interleaving set on HIGH. This setting
will incur an interleaving delay of downstream 16ms/upstream 0ms, as described in
section 3.4.
Data interleaving is a technique defined as part of the ADSL2+ standard that increases
the tolerance of line noise at the expense of some one-way packet delay. Your
customers can ask you to have interleaving set on LOW or OFF.
With interleaving set on LOW or OFF there may be a reduction in latency, therefore you
who offer latency sensitive applications may opt to have interleaving set to LOW or OFF.
However, the service may now be more susceptible to line noise that may cause your
customer to believe your service is faulty.
You’ll be responsible for evaluating if the fault is attributable to interleaving being set to
LOW or OFF, and if so for remedying this.
Interleaving OFF is intended to provide compatibility with Basic UBA. All three
interleaving options can be used with the PPPoA modem support feature.
6.2 Interleaving settings for Enhanced UBA O
The Enhanced UBA 0 and Basic UBA line profiles that are configurable through the
interleaving settings are aligned to provide a seamless user experience and a smoother
migration to next generation broadband products. The minimum line speed required to
support Enhanced UBA 0 and Basic UBA is set at 64Kbps.
For Enhanced UBA 0 only - when choosing the three Interleaving settings available,
HIGH, LOW and OFF, the you will get the following line profiles:
oInterleaving HIGH (default setting on Enhanced UBA0): When an order is
placed for Enhanced UBA 0, the default setting of HIGH applied, which
corresponds to a Basic UBA normal profile combination at 64Kbps line sync
threshold.
oInterleaving LOW: If you choose interleaving LOW, you will get a Basic UBA
Fast profile at 64Kbps.
oInterleaving OFF: If you choose interleaving OFF, you will get a Basic UBA Fast
profile with 64Kbps.
Note: for EUBA 0 the LOW and OFF provide the same setting, which is aligned with Basic
UBA.
6.3 PPPoA modem support
PPPoA modem support is a feature, available on all Enhanced UBA variants, that allows a
modem configured for Basic UBA to be connected to an Enhanced UBA tail and deliver a

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best efforts channel. For more detail on how PPPoA modem support works refer to
section 4.5.
PPPoA modem support is an optional feature provided in accordance with the WSA.
6.4 Tail Extension
Tail Extension is a backhaul service that extends an Enhanced UBA access tail from the
local handover point to a remote handover point that you’ve nominated. For more detail
on how Tail Extension works refer to section 4.6.
Tail Extension is a commercial optional feature provided in accordance with the WSA and
the Tail Extension Service Description.
7Service specification targets
Metric
Notes
Real time CoS
(200 byte packet)
Internet Cos
(1500 byte
packet)
Throughput
Kbit/s
=40kbit/s or
90kbit/s or
180kbit/s
99.9% probability
of providing to any
end customer a
minimum downlink
average throughput
of 32kbps during
any 15 minute
period on demand
Peak to line speed
Interleaving delay
Milliseconds
Interleaving HIGH: Downstream
16ms/Upstream 0ms
Interleaving LOW: Downstream
8ms/Upstream 0ms
Interleaving OFF: Downstream
0ms/Upstream 0ms
Mean one way
packet delay
Interleaving HIGH
Interleaving LOW
Downstream: 20ms
Upstream: 4ms
(excluding
serialisation delay)
Downstream: 12ms
<1s
<1s

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Interleaving OFF
Upstream: 4ms
(excluding
serialisation delay)
Downstream: 4ms
Upstream: 4ms
(excluding
serialisation delay)
<1s
One way packet
delay variation
Milliseconds
Uplink: 1ms
Downlink: 1ms
(excluding
serialisation delay)
Unspecified
One way packet
loss ratio
Interleaving HIGH
<0.1%
Unspecified
These service specifications are design targets and should be used by you when
developing end-to-end real time and best efforts applications. However the Enhanced
UBA service 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.
To achieve the specifications of the Enhanced UBA service the end customer’s line speed
must meet the minimum thresholds specified (see section 3.6). Where the end customer
line quality does not meet the required line speed threshold to deliver the service, the
Enhanced UBA service specifications will not apply.
The service specifications relate to the performance of the Enhanced UBA services from
the ETP to the handover point on the first EAS, and exclude serialisation delays,
transcoding delays, etc.
Packet delay variation is measured as: packet transfer delay (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.
Packet loss ratio and delay variation must be evaluated over an interval of 15 minutes
for all classes of service, as per our standard network practice.
Low interleaving means an interleaving setting that delivers as much error protection as
possible while introducing no more than 10ms additional one way packet delay and
subject to the mean one way packet delay specification for interleaving low being met.
Traffic will be policed at both an aggregate level and at an end customer level to ensure
compliance with the service specification.
Depending on the Enhanced UBA Service supplied, 40kbps, 90 kbps or 180 kbps of real
time traffic may be tagged per end customer. Exceeding this limit could prevent the
service specifications from being achieved.

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The Enhanced UBA 40kbps real time service uses a 60 byte packet metric (based on
G.729A codec). The Enhanced UBA 90 and 180 kbps real time service uses a 200 byte
packet metric (based on G.711 codec).
One way packet delay variations exclude serialisation delay, which is the amount of time
needed to transmit a packet over the line rate. This delay is dependent on the size of the
frame plus the size of any outstanding frames already being forwarded, and is
proportional to the actual line speed.
7.1 Exceptions to service specifications
Where your customer’s line does not meet the minimum line speed threshold required to
deliver the ordered service variant the Enhanced UBA service specifications will not
apply.
The presence of any of the below factors may mean your customer’s peak throughput for
the internet CoS is less than your line speed:
oProtocol overheads; network load.
oConstraints within either your or your customer’s domains; the presence of any
real time traffic.
oCapacity of the local aggregation path (LAP).
oAny constraints external to the Enhanced UBA Services.
8Aggregation and handover of
traffic
Each customer is located in a coverage area. The end customer traffic from numerous
DSLAMs in a coverage area is carried to the handover point over local aggregation paths
(LAP) dimensioned to support the throughput rate for Enhanced UBA of both best efforts
and real time traffic.
If you do not wish to (or are unable to) collect Enhanced UBA traffic from the local
handover point and would like to transport the traffic to a remote handover point where
you have already established a handover link, you may do so using one of the following:
•Tail Extension feature.
•UBA Backhaul.
•Third party transport.

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You can connect your network to any number of handover points throughout the country
via handover links and/or any of the options above. However, in order to consume the
Enhanced UBA service, you must connect to a minimum of one handover point.
It should be noted that it’s not possible to deliver all unbundled services over a single
handover link. While Enhanced UBA traffic can be delivered over the same handover
point with other Ethernet based access tails like HSNS (using a shared service handover
connection) it cannot be shared with other non Ethernet services such as Basic UBA
(which are delivered over ATM based network platforms) as well as any commercial
services that we’ve specified. Please refer to the handover link product user guide for
more comprehensive information on service options.
8.1 Geographic availability
Enhanced UBA is available where Chorus has ADSL2+ coverage and the upstream line
speed meets the minimum threshold required to support the requested service variant.
The minimum upstream speeds will be 64kbps for Enhanced UBA 0, 256Kbps for
Enhanced UBA 40 and 90, and 360 Kbps for Enhanced 180.
More information on Enhanced UBA coverage is available on the EUBA product page of
our website.
Changes to coverage areas / handover points
The location of handover points and related coverage areas may change in the future as
the ADSL2+ network is rolled out. Please refer to Clause 17.1.4 of the UBA STD
Operations Manual for more detail on our obligation to notify changes to coverage.
Coverage area mapping for Tail Extension will need to be updated as additional coverage
areas are added. Refer to section 5.3 for more information.
8.2 Modem installation
Modem installation is available with a connection and wiring order. The terms relating to
Modem installation are set out in the Commerce Commission’s decision, which can be
found on the Commerce Commission website.
For us to complete a modem installation you will need to ensure that your customer has:
•A modem available from the approved modem list; and
•A single desktop or laptop computer with the operating system required to
support the modem.
If the requirements above are in order we will organise for a technician to:
•Connect the modem and load the modem driver software.

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•Enter the user ID and password supplied by you and set up your customer’s email
account (Microsoft Outlook, Outlook Express and Mail for Mac 9.0 and above are
currently supported).
•We can also set up the internet browser and wireless network as specified by you
•If the modem does not connect we will perform basic fault finding or diagnostics
in conjunction with your helpdesk.
Approved modem list
We will install modems from the approved modem list. It is available as a related
resource on the UBA product pages of our website.
We have the ability to add modems to this list, to do this please supply:
•A telepermitted sample modem.
•The modem installation and technical manuals (including email and internet
browser settings).
•Your helpdesk’s contact details.
•Technical and operational specialists to assist us with drafting operational
requirements.
8.3 Relationship with other products
Enhanced UBA can be combined with a number of Chorus input products, such as
handover links, UBA Backhaul, and Commercial Colocation. You can choose to use
Enhanced UBA with or without Tail Extension. Enhanced UBA traffic can also share a
handover link with High Speed Network Service (HSNS).
This flexibility allows you to customise your customer’s end to end service. Possible
product combinations are illustrated below.
Figure 3: Enhanced UBA possible product combinations

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The following diagram shows how HSNS and EUBA can be delivered over the same
handover link:
Figure 4: HSNS and Enhanced UBA delivered over the same handover links
9How Enhanced UBA works
Enhanced UBA is a multi-class Ethernet layer 2 broadband access product with two CoS
traffic profiles to support the simultaneous delivery of real time and best efforts traffic.
Enhanced UBA is delivered over a copper access and ADSL2+ technology and provides a
transparent 802.1q Ethernet service between and end customer’s premises and a
defined handover point.
9.1 Class of service design
A key characteristic of the Enhanced UBA product is the ability to provide multiple class
of service (CoS) each with your own traffic contract.

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The two Enhanced UBA traffic classes have been designed in accordance with the ITU
Y.1541 standard for Quality of Service (QoS) classes for telecommunication networks:
Figure 5: Quality of service classes standard
•Enhanced UBA real time is mapped to class 0, and identified by 802.1p tags of 6.
•Enhanced UBA best efforts is mapped to class 5, and identified by 802.1p tags of
0.
The Enhanced UBA CoS-based design allows for the different traffic types to be treated
with different priority, and enables you to differentiate your applications across the
network, as shown in the table below:
Class
802.1p
Description
Best efforts
0
Intended to be used by internet applications that are not
latency or jitter sensitive, such as browsing, email etc
Real time
6
Intended to be used by applications that have significant
latency constraints, such as VoIP.
Note: different implementations of these applications may
have quite different performance results for your customer.
End-to-end performance will depend on the handover and backhaul components, your
network, the end-to-end routing, the end customer environment and the actual
application used.
The 802.1p marking uses three bits of an 802.1q frame to classify priority as follows:

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Figure 6: 802.1q frame
It’s the responsibility of you or your customer to ensure traffic is tagged with the
appropriate priority setting. Untagged or incorrectly tagged traffic will be discarded.
9.2 Enhanced UBA protocol stack
As illustrated in the figures below, the Enhanced UBA protocol stack is designed to
support the CoS based design, specifically the simultaneous delivery of real time and
best efforts traffic.
Figure 7: Enhanced UBA protocol stack
The following diagram shows how PPPoA modem support is delivered in parallel to the
bridged Ethernet channel. Use of the PPPoA modem support channel is optional on all
Enhanced UBA variants, but only supports best efforts traffic.

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Figure 8: Enhanced UBA protocol stack with PPoA modem support
9.3 Enhanced UBA Ethernet architecture
Enhanced UBA is an Ethernet service with a VLAN based architecture. Each Enhanced
UBA access tail connection is carried over dedicated VLANs from your customer’s
premises to the handover point, as below:
Figure 9: Enhanced UBA Ethernet viewpoint
The Enhanced UBA Ethernet architecture has been designed as follows:

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•Two ATM PVCs over ADSL2+ provide two channels as follows:
oVPI/VCI 0/110 Bridged Ethernet supporting a single 802.1q VLAN ID of 10.
oVPI/VCI 0/100 PPPoA session. The DSLAM converts the PPPoA traffic into
PPPoE, tags it as best efforts, and inserts it into a separate dedicated
VLAN from the DSLAM to your network.
•These channels will share the same traffic contract, i.e. do not add.
•At your end the Ethernet VLANs are identified by a unique assigned 802.1ad
service VLAN ID/customer VLAN ID combination, see below for further
information on VLAN IDs.
•Our network will translate the 802.1q VLAN ID to the 802.1ad identifiers.
•The Enhanced UBA VLAN will support both best efforts traffic and real time traffic
as long as that traffic is tagged correctly. Incorrectly marked traffic, including no
markings at all, will be discarded.
If you or your customer exceeds the specified real time traffic contract for the service
variant chosen, then the excess traffic is randomly discarded and service performance
targets will no longer be met.
If you or your customer sends best efforts traffic that exceeds the specified traffic
contract over the Handover Connection, LAP, or backhaul bandwidth, then this traffic will
be queued and finally randomly discarded –however real time traffic will not be affected.
Best efforts applications should expect this behaviour under network congestion.
Note: the best efforts contract is shared between both channels. The following Ethernet
protocols are supported on Enhanced UBA:
Figure 10: Enhanced UBA Ethernet protocols