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A competitive comparison of

IPClear and MPLS VPN


http://slidepdf.com/reader/full/ipclear-mpls-vpn-whitepaper 2/9NetServices Plc. Waters Edge Business Park, Modwen Road, Salord, Manchester, M5 3EZ, UK

Tel: 0870 753 0900 - E-mail: [email protected] Web: www.netservicesplc.comalltogether Business

A Brie Look at Current Issues

Traditionally the requirement or QoS enabled access technologies,

such as leased lines and the BT IP Clear ADSL access variants has

proved to be too expensive a component to justiy IP Telephony

deployment to small oces. This constraint is accentuated with a

requirement to service between 1 and 16 handsets. In many cases

the capital expenditure required ensures that the return on investment(ROI) model or the solution simply does not work.

This issue is compounded when considering the easibility o an

IP Telephony solution or organisations where there are a large

proportion o small sized oces. This generally results in one o

three scenarios occurring;

1. The ROI model associated with the IP Telephony solution ails,

resulting in the solution not being deployed and the organisation

maintaining its existing telephony inrastructure. This oten happens

when the integrator, or reseller, involved has already spent time

designing and speciying the solution.

2. IP Telephony is only deployed to the larger oces. This cut-down

solution does not enable the organisation to benet rom all o the

eciencies created by an organisation-wide IP Telephony roll-out and

limits hardware and managed service value or the reseller.

3. The systems integrator makes a loss in deploying the service to

the small oces in order to justiy the ROI associated with the IP

Telephony solution.

None o the above are ideal outcomes or the integrator involved.

Introducing NetServices QoS over DSL products as part o the

network dramatically improves the prospect o winning a protable

IP telephony solution. QoS over DSL provides the Systems Integrator

community with the potential to revisit both current and pending

opportunities, as well as potentially enhancing the existing IPTelephony solutions that they are already supporting.

Examining the Options

BT IP Clear is still the product o choice or most voice networking

requirements. The reduced ootprints o Local Loop Unbundled

networks have ensured that IP Clear has remained the market

leader. NetServices’ QoS over DSL solutions utilise the BT IPStream

and DataStream DSL network inrastructures to provide a credible

alternative, incorporating the same coverage and improved capability

over IP Clear.

DSL is ast becoming accepted as the access technology or next

generation networks. The increased capacity provided by ADSL Max,

and in the near uture by ADSL version 2 technologies, will ensure

that DSL will supersede legacy technologies, such as leased lines

and ISDN, in delivering voice connectivity to locations at a reduced

cost. Service levels around DSL are predicted to be improved

through the introduction o a business grade enhanced care product.

Now NetServices unique ability in prioritising trac over DSL can

extend its use in solutions where previously it was unsuitable.

1

BTs IP Clear product is seen as the deault choice or many IP Telephony (IPT) roll-outs as it is generally seen as a robustand proven technology. Limitations with this solution arise when small or branch ofces need to be considered as part o the

solution. Moving rom an ADSL IP Clear solution capable o delivering two calls rather than one gives rise to a price increase o 230%.

Allthough DSL is the cost-eective option or networking until recently it too had limitations. The act that it was impossible to deliver

prioritisation or Quality o Service (QoS) over all DSL technologies, vital or many voice implementations, resulted in DSL being unsuitable or

voice over IP networks.

NetServices have developed the ability to run QoS over all DSL solutions providing ar greater technical fexibility in IPT roll-outs as well as

signicant commercial benets. Connecting the small oce with QoS over DSL produces network savings in excess o 59% and 83% against

IP Clear, when providing 2-4 calls and 5-16 simultaneous voice calls respectively.

NetServices oers the ability to deliver cost-eective voice networks in all scenarios, even to the smallest o sites, and eectively overcomes

the limitations o IP Clear to deliver a small number o simultaneous calls cost-eectively.

Part 1: The Commercials o Convergence (04/04/08)




Delivering Voice Solutions in that ‘Problem Range’

1-16 Simultaneous Calls

The available technologies used to deliver a small number o

simultaneous voice calls to a location have traditionally been

restricted to leased lines and the BT IP Clear ADSL access variants.

Their limitations when voice capacities versus cost are comparedhave already been highlighted. The ollowing direct comparisons

scrutinise the commercials in more detail.

Technical Comparison

Using IP Clear

Using an IP Clear solution organisations can connect their small

oces to a QoS enabled network by a number o methods o access

technology. The three IP Clear access technologies most commonly

used to service small oces, in terms o a best commercial and

technical t, are as ollows:

1. ADSL Plus - contended (5:1) ADSL Service.

2. ADSL Premium - non-contended (1:1) ADSL Service.

3. Leased Line

Quality o Service can be applied to all three IP Clear access

technologies, with six classes o service being available. Voice must

be congured into the prioritised, expedited orwarding (EF) class.

BT stipulates a maximum congurable amount o bandwidth that

can be used or voice trac. This gure is dependent upon the type

o access technology, and is detailed below or the ADSL IP Clear

access products:

• ADSL Plus - 30kbps voice bandwidth

• ADSL Premium - 130kbps voice bandwidth

To optimally use the available voice bandwidth it is essential to use

the G.729 CODEC at a 30msec sampling rate. This ensures that the

bandwidth consumed by one voice call is 28.3kbps. Thereore to

deliver between 1 and 16 simultaneous voice calls, the ollowing IP

Clear access technologies can be used:

Table 2. Minimum IP Clear product to service

1 – 16 simultaneous G.729 voice calls

ADSL Plus is capable o delivering one voice call, whereas the ADSL

Premium is capable o delivering up to a maximum o 4 simultaneous

voice calls. For delivery o greater than 4 simultaneous voice calls a

leased line is required.

Using NetServices QoS over DSL

NetServices has an extensive range o access technologies suitable

to connect smaller oces to a QoS enabled network. The most

common MPLS VPN access technologies used to service small

oces, in terms o a best commercial and technical t, are as

ollows:

1. QoS DSL IPStream - contended (oce) ADSL Service

2. QoS ADSL DataStream - non-contended (1:1) ADSL Service

3. QoS SDSL DataStream - non-contended (1:1) SDSL Service

2

Table 1. Solution Overviews

BT IP Clear

The BT IP Clear solution provides a wires-only IP access service that

enables large corporations, mid-size enterprise, carriers and ISPs to create

IP based VPN services.

It is based upon BTs wholly owned and managed Multi Protocol Label

Switching (MPLS) network and is marketed as providing the perormance,

reliability and security o a leased line network, with the any-to-any

scalabilities and fexibilities o an IP network.

BT IP Clear enables network connectivity to locations over a wide range o

bandwidths and oers dierentiated perormance levels and prioritisation

o delay, and non-delay sensitive trac, including voice and multi-media

applications.

There is a dened pricing structure with a one-o connection charge

and an annual rental ee required per access into IP Clear connection.

A competitive Universal Discount Scheme based on annual spend and

commitment is available to wholesale partners, with a maximum 30%

saving being available or a 5 year committed annual spend o above £2 million.

NetServices Wires-Only MPLS VPN

NetServices are networking specialists with a comprehensive portolio

o converged communications solutions acilitating the delivery o voice

and other mission critical data applications. Our expertise, and unique

ability in QoS over DSL access technologies or MPLS VPN solutions,

is complemented by use o ethernet and leased line capabilities where

appropriate.

NetServices’ MPLS VPN service is available as a ully managed network

service, or unbundled as a wires-only service. The wires-only option is

ideal or systems integrators and value added reseller partners, enabling

them to provision client networks through NetServices, whilst supplying

and managing the routers and other customer premises equipment (CPE)

themselves.

There is a simple pricing structure or service where a one-o connection

charge and an annual rental ee are required per connection.

A partner discount scheme is also available.

MaximumSimultaneous

Calls

Access into IP Clear product required

1 256kbps ADSL Plus Access into IP Clear with 30kbps EF

2 256kbps ADSL Premium Access into IP Clear with 60kbps EF

4 256kbps ADSL Premium Access into IP Clear with 120kbps EF

5 256kbps Leased Line Access into IP Clear with 150kbps EF






Quality o Service can be applied to all technologies, with up to a

maximum o our classes o service being available. Voice must be

congured into the prioritised Platinum class.

The maximum amounts o bandwidth that can be reserved or voice

trac or the ollowing NetServices QoS over ADSL access products

are as ollows:

• 812kbps QoS DSL IPStream - 150kbps voice bandwidth

• 256kbps QoS ADSL DataStream - 192kbps voice bandwidth

• ≥512kbps QoS ADSL DataStream - 384kbps voice bandwidth

The above gures are based around the standard NetServices

product set. A number o enhanced service options are available

on a bespoke basis or both QoS DSL IPStream and DataStream,

where the boundaries o ADSL Max technology have been stretcheddelivering greater voice bandwidth.

By optimally using the G.729 CODEC with the variables o sampling

rate and real-time header compression, the voice bandwidth

consumed by 1 voice call will be 28.3kbps and 21.2kbps across

QoS DSL IPStream and QoS DSL DataStream respectively.

Thereore to deliver between 1 and 16 simultaneous voice calls, the

ollowing QoS over DSL access products can be used:

Table 3. Minimum NetServices QoS over DSL product to service 1 – 16

simultaneous G.729 voice calls

QoS DSL IPStream is capable o delivering upwards o 5, and QoS

DSL DataStream is capable o delivering up to 16, simultaneous

voice calls to an oce.

Commercial Comparison

Viewing the commercials against the technical solutions outlined

above immediately highlights the issues integrators have with certain

installs - as well as demonstrating a sweet-spot or the NetServices

solution. The below table provides a direct cost comparison between

the NetServices and IP Clear products required to deliver the stated

maximum number o simultaneous calls to a small oce. The

NetServices enhanced care option has been actored in to ensure

that service levels are comparable.

All pricing is based around BT and NetServices guide pricing and is

exclusive o any discounts scheme. It is worth considering that the

maximum saving that could be achieved via the BT VPN universal

discount scheme is 30%, though the ADSL Plus service does not

qualiy under this scheme. Bespoke pricing is available rom both

parties, BT and NetServices, based on the metrics o contract term

and customer network design.

The substantial price increase when moving between the ADSL Plus

and the ADSL Premium solution is key to understanding the benets

the NetServices’ solution oers. ADSL Premium becomes essential

when the solution has the need to handle 2 calls rather than 1. In

commercial terms this requirement equates to an increase o 230%.

Using NetServices or the deployment o 2-4 simultaneous calls, QoS

DSL IPStream provides savings in the region o 59% over its most

comparable BT IP Clear solution, ADSL Premium.

The only IP Clear solution able to provide sucient voice bandwidth

or more than 4 calls is a leased line. With NetServices using QoS

DSL IPStream or upwards o 5, and QoS DSL DataStream or up to

16 simultaneous calls, annual network savings in excess o 83% are

achieved.

3

Maximum

SimultaneousCalls

NetServices Access Product Required

1 800kbps QoS ADSL IPStream, 50kbps Platinum




8 256kbps QoS ADSL DataStream, 180kbps Platinum

16 512kbps QoS ADSL DataStream, 360kbps Plat inum

Maximum

Simultaneous Calls

NetServices

set-up charge

IP Clear

set-up charge

NetServices

set-up saving

NetServices

annual rental charge

IP Clear

annual rental charge

NetServices

annual rental saving

1 £100.00 £100.00 0.00% £640.00 £650.00 1.54%

2 £100.00 £500.00 80.00% £875.00 £2,150.00 59.30%

4 £100.00 £500.00 80.00% £955.00 £2,300.00 58.48%

5 £100.00 £1,500.00 93.33% £955.00 £5,875.00 83.74%

8 £135.00 £2,500.00 94.60% £1,525.00 £9,100.00 83.24%

16 £135.00 £3,500.00 96.14% £1,915.00 £12,187.50 84.29%

Table 4. Commercial Comparison between using NetServices and IP Clear or 1 – 16 Simultaneous G.729 Voice Calls




Example Scenarios

The previous section has demonstrated the commercial benets o

the NetServices QoS over DSL products or providing between 1 and

16 simultaneous voice calls to a small oce. Mapping these intoreal-world scenarios, highlighted earlier, urther demonstrates the

commercial benets. In the opening section o this paper a strong

conclusion was made that the cost o legacy network technologies,

such as the BT IP Clear solution, ensures that the ROI models or

IP Telephony solutions does not work, especially or multi-oce

scenarios where there are large numbers o small oces.

Scenario 1: Company A

Company A is a UK based organisation specialising in the sale and

distribution o a garden product. There are 85 medium sized retail

outlets and an additional 20 small outlets located within well known

department stores. In addition there is a group headquarters, their

northern and southern distribution centre, and a main manuacturing plant.

It is the view o both the systems integrator and the company’s IT

Director that the communications inrastructure currently in

place is over specied or their requirements. The outcome to

be urther explored is; would the introduction o a group wide

converged communications inrastructure provide signicant

communications cost savings and generate signicant operational

eciencies?

The Systems Integrator previously proposed a converged multi-site

IP Telephony solution using the BT IP Clear solution in conjunction

with Cisco Call Manager. Signicant savings were expected through

the removal o some PSTN lines at the retail outlets, as well as

reduced call rates with all external calls being centrally routed via the

Headquarters, and ree on-net calls between oces.

However the ROI model did not work due to the capital and

operational expenditure attributed to the IP Clear network

component, so the opportunity has not moved orward.

To assess this opportunity the existing voice and data requirements

or all o Company A’s oce types have been determined and the

most suitable IP Clear and NetServices network solutions specied

by means o comparison.

Converged Network Requirements

Company A has disparate voice systems. Communications at all

sites are completely autonomous thereore all company wide internal

calls and external calls are routed out via the PSTN. There are PBX

systems located at the 4 large oces where they are connected to

the PSTN via ISDN30e connections. The retail outlets have a number

o analogue phones that are individually connected to the PSTN.

An MPLS data network is used to connect all sites together.

The Groups IT applications are centralised at the headquarters.

The network delivers applications including EPOS, email, stock

control and limited web browsing via a central proxy server at

the headquarters. There are no plans to introduce any urther

applications in the next three years.

The diagram below represents the current voice and data communications

set-up o Company A with its separate voice and data networks.

The individual voice and data requirements or all oces have been

assessed by Company A and their Systems Integrator partner to

determine the requirements or a ully converged voice and data

network solution, and are outlined in the table below.

Table 5. Company A’s converged network bandwidth requirements

4

MPLS WAN

PBX

PBX

PBX PSTNPSTN

ISDN30e

15 Channels

ISDN30e

8 Channels

Analogue

Lines

Analogue Phones

Distribution

Centres

1Mb/s SDSL

2Mb/s

Leased Line

2x ISDN30e

60 Channels

Headquarters

1Mb/s SDSL

512kbps

ADSL Office

512kbps

ADSL Office

Manufacturing

Plant

Larger Retail

Outlets

Small Retail

Outlets

Analogue Phones

Figure 1. Company A Existing Voice and Data Network

Ofce Type

Maximum

simultaneous

calls

Voice

bandwidthrequirement

(kbps)

Data


(kbps)

Total


(kbps)

Group Headquarters 35 990.5 545.5 1536

Distribution Centre 12 339.6 250 589.6

Manuacturing Plant 4 113.2 75 188.2

Large Outlet 2 56.6 5 61.6

Small Outlet 1 28.3 5 33.3




IP Clear Solution or Company A

The most appropriate IP Clear solution or Company A’s converged

networking requirements can be seen in the table below.

For the purposes o pricing this network it has been assumed that

non voice trac is treated as ‘best eorts’ and that no UniversalDiscount Scheme pricing has been applied.

Leased lines are required to satisy the voice requirement o the

headquarters and distribution centres due to the congurable

voice bandwidth being well in excess o the 130kbps limit o ADSL

Premium access into IP Clear. For the manuacturing plant and large

outlets, the IP ADSL Premium product can be used as it can easily

cope with the voice and data bandwidth requirements. The small

outlets only have the requirement or 1 voice call and so the ADSL

Plus product is suitable.

NetServices MPLS solution or Company A

The NetServices solution or Company A utilises three accesstechnology types as outlined below. The table also outlines the cost

savings achieved in comparison to the IP Clear solution.

For the purposes o pricing this network it was assumed that non

voice trac is treated as ‘best eorts’, the enhanced care option has

been selected, and no discount scheme pricing is applied.

A leased line has been recommended or the headquarters in

preerence to SDSL, due to the importance o the oce and

the enhanced Service Level Guarantee that is available with this

technology. For the distribution centres the QoS DSL DataStream

product proved best-t to deliver the required number o voice calls.

The manuacturing plant and the retail outlets will use variants o the

QoS DSL IPStream product depending upon the voice requirements.

In this example QoS over DSL can be used to service the converged

network requirements or all but one o Company A sites. Using the

NetServices solution means the integrator can deploy a solution thatboth delivers the expected service levels and provides network savings

in excess o 73% at set-up and 57% on an ongoing annual basis.

Conclusions

NetServices QoS over DSL technologies enables organisations to

cost eectively deploy IP Telephony solutions to a greater proportion

o locations - in particular small oces.

Because the ROI model is improved or organisation wide deployment

(as it reduces the WAN component charges) the business case or IP

Telephony is much more compelling or end-user organisations.

A more compelling business case to adopt IP Telephony ensures

additional benets seen can also be realised. These include greater

fexibility, enhanced user eature intuitiveness, improved reach and

presence, the introduction o unied communications and more

e-business applications.

QoS DSL is an enabler or organisations to achieve the above

objectives which will ultimately lead to the Systems Integrator

increasing value-added managed services to organisations.

5

Ofce TypeNo. oOfces

IP Clear SolutionSet-UpCharge

Annual RentalCharge

Total Set-UpCharge

Total AnnualRental Charge

Group Headquarters 1 2Mbps Leased Line with 995kbps EF £3,500.00 £14,487.50 £3,500.00 £14,487.50

Distribution Centre 2 1Mbps Leased Line with 340kbps EF £3,500.00 £11,850.00 £7,000.00 £23,700.00

Manuacturing Plant 1 512kbps ADSL Premium with 115kbps EF £500.00 £3,387.50 £500.00 £3,387.50

Large Outlet 85 256kbps ADSL Premium with 60kbps EF £500.00 £2,150.00 £42,500.00 £182,750.00

Small Outlet 20 256kbps ADSL Plus with 30kbps EF £100.00 £650.00 £2,000.00 £13,000.00

Total £55,500.00 £237,325.00

Table 6. Minimum IP Clear solution or Company A’s converged networking requirements

Table 7. Minimum NetServices solution or Company A’s converged networking requirements and savings over IP Clear

Ofce TypeNo. o

OfcesNetServices Access Solution

Set-Up

Charge

Annual

Rental Charge

Total

Set-Up Charge

Total Annual

Rental Charge

Group Headquarters 1 2Mbps Leased Line with 995kbps Platinum £3,971.29 £6,906.71 £3,971.29 £6,906.71

Distribution Centre 2 1Mbps QoS ADSL DataStream, 360kbps Platinum £135.03 £2,800.22 £270.00 £5,600.44

Manuacturing Plant 1 800kbps QoS ADSL IPStream, 150kbps Platinum £100.00 £955.00 £100.00 £955.00

Large Outlet 85 800kbps QoS ADSL IPStream, 100kbps Platinum £100.00 £875.00 £8,500.00 £74,375.00

Small Outlet 20 800kbps QoS ADSL IPStream, 50kbps Platinum £100.00 £640.00 £2,000.00 £12,800.00

Total £14,841.29 £100,637.15

Saving over IP Clear £40,658.71 £136,687.85Saving as a Percentage 73.26% 57.60%




From humble beginnings as a cheap orm o internet accessor the home user, DSL technologies have matured to

become a valuable business communications tool. Until now

its limitations have been that most DSL in the UK has been

delivered across the BT IPStream network, this is a contended

network unable to dierentiate between trafc types and

prioritise accordingly. In eect, this has limited the value

o incorporating DSL in converged solutions where it was

otherwise most suited i.e. at the smallest sites.

NetServices have now breached this boundary, thus elevating DSL

rom bit part player to its leading role in enabling convergence or

the SME, branch oce and teleworker. NetServices only use privateDSL networks as the basis o all our services so no public internet

is involved, thus minimising the security risks many are concerned

about with DSL based services.

This has been achieved by incorporating a number o products and

technical eatures to achieve MPLS across the NetServices core

network.

QoS over DSL Access Technologies

NetServices delivers QoS over DSL access technologies via both it’s

DataStream and IPStream networks.

Technical Benefts

By developing an innovative range o DSL solutions to provide QoS

enabled connectivity to oces, distinct technical advantages over

the BT IP Clear solution are realised with the NetServices QoS over

DSL products. The scope o the technical advantages includes the

ollowing;

• The use o ADSL Max technology or all ADSL access circuits

allows delivery o increased upstream, thereore synchronous

bandwidth over ADSL, enabling a greater volume o simultaneous

calls to be provided to oces. For IP Clear ADSL access circuits,upstream bandwidth is limited to 256kbps.

• The bandwidth that can be reserved or voice trac when

applying QoS on NetServices ADSL access circuits is greater than

that available with the respective IP Clear products. This enables

more voice calls to be made and ensures that the voice quality can

be optimised. NetServices recommend the maximum congurable

bandwidth being provisioned into the Platinum class should not

exceed 75% o the network access bandwidth or voice-only

deployment scenarios, and 50% or converged scenarios.

•

The use o IP Clear in conjunction with the G.711 CODEC isbandwidth inecient as only 1 call can be made with the ADSL

Premium service and no calls can be made with the ADSL

Plus service. This will impact upon the capability to use legacy

telephony devices such as axes, as they only use the G.711CODEC ater conversion via an ATA device. Thereore, when using

IP Clear it is likely that PSTN lines will need to be maintained i

legacy ax devices are to remain.

• The NetServices QoS DSL DataStream product supports the

use o the Real Time Header Compression (cRTP) eature which is

not available with IP Clear. This approximately doubles the amount

o concurrent calls that can be achieved in comparison to ADSL

Premium Access into IP Clear.

• Multi Link Point to Point Protocol (MLPPP) bonding is available

with the QoS DSL DataStream product, providing increasedsynchronous bandwidth to oces. This is ideal or oces where

the achievable DSL line rate is low, or the cost and/or availability

o other higher bandwidth access technologies, such as leased

lines/ethernet, is restricted. This is usually dictated by geography.

Service Advantages

In addition to the technical advantages o the NetServices QoS over

ADSL products, there are some signicant service dierences that

should also be considered when comparing products, these are

detailed below.

• NetServices provide a ull Service Level Guarantee or the QoS

over DSL services. There is no SLG or service availability or

restoration with the IP Clear ADSL access connections.

• Enhanced Care is provided with the IP Clear ADSL access

product, this provides a 24 hour 365 day cover, with a 4 hour

response and 24 hour repair target. Enhanced Care is available

rom NetServices as an option, and so can be omitted, reducing

annual rental pricing.

• The standard lead time or delivery o services or the

NetServices QoS over DSL products is 15 working days. TheIP Clear ADSL access products have a standard lead time o

25 working days. Unlike the NetServices products, there are no

penalties i the contractual delivery date is not achieved with the IP

Clear ADSL access products.

• For both IP Clear ADSL access products and the NetServices

QoS DSL DataStream access product there is a minimum

contractual term o 12 months. There is a level o fexibility with

the QoS DSL IPStream access products and thus shorter contract

terms can be provided, on an opportunity specic basis only.

6

Part II: How it Works, The Technical Details




QoS DSL - DataStream

ADSL and SDSL services are delivered via the BT DataStream ATM

based network. Here the connectivity provisioned to a location uses a

dedicated Virtual Path within the DataStream ATM network, rom thelocation to NetServices, ensuring that the service is non-contended.

Non-contended circuits oer greater throughput rates, with a higher

level o consistency than contended DSL services. The achievable

bandwidth is comparable to leased lines, though cost is reduced at

the expense o the SLA.

The use o ADSL Max technology provides an increased upstream

capability, thereore greater voice bandwidth can be provisioned than

with standard ADSL, where the upstream is restricted to 256kbps. The

1Mbps service provides a hybrid solution with the achievable line speeds

in between those available with SDSL and conventional ADSL services.

Bonded DSL circuits are available where a number o end-user

access circuits are mapped into a dedicated Virtual Path within the

BT DataStream network. Multi-Link Point-to-Point Protocol (MLPPP)

is then used to aggregate the sum o the bandwidth supplied by the

individual access circuits.

QoS DSL - IPStreamQoS DSL - IPStream technology provides downstream QoS over

contended ADSL Max Oce circuits. The Cisco eature “per session

shaping and queuing over L2TP” is used to prioritise bandwidth

delivered into the BT network. BT state that the expected end user

experience or ADSL Max will provide a downstream throughput o

800kbps, thereore a ‘best eorts’ QoS capability is achieved.

The technology provides signicant technical advantages over

standard contended DSL circuits, where some QoS eatures can

be implemented in the upstream direction o the outbound CPE

interace, but not in the downstream direction.

Using contended DSL with limited QoS eatures results in the user

experience being inconsistent, especially when running a real-time

data application across the service. For example when making a

voice call, speech quality may be acceptable or a long period until a

large data le starts downloading simultaneously with the trac rom

a voice call. With no downstream QoS available, voice and data trac

are competing or bandwidth. This can result in jitter, delay and packet

loss ultimately causing speech quality to be detrimentally aected.

QoS DSL - IPStream is available with a xed bandwidth and a nite

number o service policy options, in both converged and data-only

ormats. The table below provides a direct comparison between the

NetServices and BT ADSL access products.

7

BT ADSL Premium Access to IP Clear

BT ADSL Plus Access to IP Clear

NetService QoS ADSL -DataStream

NetService QoS ADSL- IPStream

Downstream Bandwidth 2048, 1024, 512, 256kbps 2048, 1024, 512, 256kbpsIncrements up to 8Mb/s, 2048,

1024, 512, 256kbps812kbps

Upstream Bandwidth 256kbps 256kbps up to 812kbps, 512kbps, 256kbps up to 812kbps

Contention 1:1 5:1 1:1Oce Contention, with

voice bandwidth guaranteed

QoS Architecture DiServe - DSCP DiServe - DSCP IP Precendence IP Precendence

Classes o Service 6 (EF, AF1-4, DE) 6 (EF, AF1-4, DE) 4 (Platinum, Gold, Silver & Bronze) 3 (Platinum, Gold & Bronze)

Congurable Voice Trac1 130kbps EF 30kbps EF256kbps - 190kbps Platinum

512kbps - 375kbps Platinum50,100, & 150kbps1

RTP header Compression (cRTP) available no no yes no

Link Fragmentation and Interleaving available2 yes yes yes no2

MLPPP bonding available no no yes no

Maximum concurrent G729 Voice Calls at a

30msec sampling rate on a single circuit34 1 163 53

Service Level Guarantees Core Perormance No SLG

On-Time Delivery,

Service Availability and

Restoration with enhanced Care

option is taken,

Core Perormance

On-Time Delivery,

Service Availability and

Restoration with enhanced

Care option is taken,

Core Perormance

Enhanced Care - 4 hour response,

24 hour repair target on ADSLMandatory Mandatory Optional Optional

Table 8. Technical and Commercial Comparison

1These are the standard product oerings, other bespoke options are available.

2The absence o LFI is minimal in most circumstances as the upstream bandwidth available is up to 812kb/s. Thereore the maximum serialisation delay that can be created by thelargest possible IP packet is 15msec.

3NetServices recommendation.




Summary

The BT provided IP Clear network, although a robust and proven network component or an IP Telephony solution, is cost prohibitive or small

oces. NetServices QoS over DSL product oerings provide systems Integrators and VARs with the ability to deliver more simultaneous voice

calls over an ADSL connection. This ensures that signicant savings are achieved in delivering IP Telephony to a small oce.

The IP Clear ADSL Plus and Premium services limit the number o simultaneous calls that can be made, to 1 and 4 respectively, and require

expensive leased lines to service any higher number o calls. NetServices use ADSL MAX technology to increase upstream bandwidth. Along

with cRTP and MLPPP eatures, the number o simultaneous voice calls that an ADSL circuit can deliver is increased. The QoS DSL IPStream

product can deliver up to 5 simultaneous voice calls, and the QoS DSL DataStream product up to 16 simultaneous voice calls.

Using the NetServices DSL based solution ensures that annual recurring savings in excess o 59% are achieved or delivering 2-4 calls, and

savings in excess o 83% can be achieved where 4-16 simultaneous voice calls are required.

By considering a real world scenario it has been possible to show the ull commercial benet o using NetServices QoS over DSL rather than

an IP Clear solution as the network component o an IP Telephony opportunity. In Company A’s scenario an organisation with a high proportion

o small oces, set-up savings o 73% and recurring rental savings o 57% were demonstrated using the NetServices solution rather than the

IP Clear solution.

The use o the NetServices QoS over DSL access products provide a superior technical, service and commercial solution or the network

component required or the delivery o IP Telephony to the small sized oces. When using NetServices network solutions the return on investment

models or IP Telephony solutions are greatly improved, making it ar more likely and increasing the likelihood o the service being deployed.

NetServices brings you the alltogether business

NetServices provides integrated networking, voice and hosting solutions that enable businesses to become alltogether more ecient and

alltogether more protable.

Whilst other network integrators talk about the promise o a converged business, we concentrate on the actual delivery o tangible business

improvement through reliable and proven solutions allied with technological innovation.

Our business proposition is based upon bringing simplicity and increased business perormance to our customers and reseller partners.

This is achieved through ‘best in class’ skillsets, a comprehensive product portolio and an enviable heritage in networking and convergence

technologies.

In eect, we bring it alltogether .

Our customers and reseller partners beneft rom:

• Specialist knowledge in complex network specication

• Expertise in voice and converged solutions

• Carrier and vendor independence

• Our own network and data centre inrastructure

• A fexible approach or adaptable and scalable solutions

• Overseas reach through Teleonica

• PRINCE2 certied Project Managers

• Dedicated ITIL best practice trained Service Managers

• Continuous service improvement plan

• Ongoing customer support and assistance

•24x7 service desk contactable by telephone, email or online portal

• Strict SLAs with regular customer and service reviews

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