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BT’s 21CN & Customer Premise
Equipment (CPE) Compatibility
Paul ffitch & Mike Piggott
BT Wholesale
The dates and other information about BT's 21CN programme in this
presentation are based on the best information currently available. As in any
programme of this size and complexity, they may be subject to change
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21CN CPE Compatibility
• What is 21CN?
• What are the Implications for CPE of 21CN?
• Objectives and Scope of CPE Compatibility Testing
Programme.
• CPE Compatibility Testing Progress & Focus.
• CPE Database.
• Information and Reference.
• Questions.
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What is 21CN?
3
BT’s CURRENT UK NETWORK
PSTN
Copper
Leased lines
PSTN
KStream
DSL
ATM
PDH
access
Fibre
IP
SDH
SDH
access
PDH
access
SDH -SDH
MSH
PDH
End
User
4
~5.5k
sites
~2k
sites
~1k
sites
~300
sites
~100
sites
~15
sites
21CN – BT’s SIMPLIFIED UK NETWORK
Multi-service access
Converged core
Call Server
Copper
WWW
DSL
Fibre &
Copper
IP-MPLS-WDM
Agg Box
Content
Wireless
End
User
5
~5.5k
sites
~100
sites
ISP
The 21CN Migration Challenge
• Building 21CN involves:
– the migration of every end user, that is
around 30m PSTN/ISDN lines and around
8m broadband lines.
– the replacement of network equipment
housed in more than 5500 serving
exchange sites.
– It does not affect Private Circuits or the
Mobile Network.
• Migration must be achieved
– Quickly i.e. in 5 years.
– Cost effectively.
– With minimum disruption to end users.
– In parallel with business as usual activities.
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What are the implications
for CPE of 21CN?
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Implementing services on 21CN
PSTN:
•
•
New PSTN line cards in new MSAN edge equipment.
IP packet based transport of voice data (legacy PSTN uses switched circuit
transport).
ISDN:
•
•
New ISDN line cards in new MSAN edge equipment.
IP packet based transport of voice data (legacy PSTN uses switched circuit
transport).
Broadband:
•
•
New ADSL/ADSL2+ line cards in new MSAN edge equipment.
Same IP packet based transport as existing broadband.
Some of these changes cause certain characteristics to differ from those on the
existing network.
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CPE related 21CN differences
PSTN
• loop current: maximum off-hook loop current reducing.
• ringing implementation moving to balanced ringing.
PSTN and ISDN
• echo cancellation used unless fast modems are detected.
• audio path discontinuities when jitter buffers adapt.
• end to end delay increasing.
Broadband
No fundamental changes expected.
•
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Loop current comparison
45
40
Legacy
21CN
35
30
25
20
Loop Resistance
10
2540
2340
2140
1940
1740
1540
1340
1140
940
740
540
340
10
140
15
0
Maximum Loop Current (mA)
Loop Current: 21CN vs Legacy PSTN
Ringing implementation
• Existing PSTN:
Uses predominantly unbalanced ringing - voltage applied to one wire of
copper pair only.
• PSTN on 21CN:
Will use balanced ringing -half the full voltage applied to both wires.
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Echo cancellation
• Existing PSTN & ISDN:
Has long since used echo cancellation for international voice calls, and
some UK calls.
• 21CN:
Will use echo cancellation for all voice calls. Echo cancellation will be
switched off when high speed modems are detected.
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Audio path discontinuities
• Existing PSTN & ISDN:
Typically no audio path discontinuities.
• 21CN:
Some audio path discontinuities will occur when jitter buffers adapt up or
down in length. Jitter Buffers are used at each far end of a call to deal with
the variability in IP data packet arrival time (packet jitter).
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Round trip delay on BT to BT calls
UK to UK, fixed network to fixed network, standard geographic call routing
for a long distance call (south of England to north of Scotland), excluding any
customer end network
• Existing PSTN:
– In the region of 40-50ms round trip delay.
• 21CN to existing PSTN:
– Expected to be in the region of 90-95ms round trip delay.
• 21CN to 21CN
– Expected to be in the region of 70-75ms round trip delay.
Above figures are illustrative of expectations, not absolute maximums.
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Network is Built to Standards
• BT SIN’s (Suppliers Information Notes).
– Migrated services will continue to be consistent with what is in the
current SIN’s.
• UK Transmission Plan.
– 21CN meets the performance criteria & specifications of ND1701
issued by the NICC.
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CPE Compatibility Testing:
Objectives and Scope
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Lab Testing
• Network Integration Testing (NIT) and Verification and
Validation (IVVT)
– 600,000 tests (100,000) since November 2006.
– 9,500 trouble reports cleared.
– Test labs at Adastral and Swansea (BT) and Solihull, Guilford and
Reading (vendors with BT).
– Test model equivalent to 20% UK inner core capacity.
• Customer Premise Equipment (CPE)
– Hundreds of CPE tested in the LAB and Swansea CP test facility.
– Industry invited to offer CPE for testing.
– Results published in open forum to industry via Consult21 test
database.
• Test management & automation
–
–
–
–
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Central management of all test cases.
Audit trail of test configuration.
Database of test results.
Test planning and statistics on test execution.
Objectives of CPE Compatibility Testing
• To help ensure that CPE compatibility related issues are
constrained to an acceptable level.
• Feedback into the 21CN design, if and when compatibility issues
are found.
• To help identify CPE compatibility related issues so that appropriate
solutions can be communicated to all relevant stakeholders.
• To help manufacturers and other stakeholders ensure that CPE
functions properly on 21CN.
• Where relevant, assess impact of migration process.
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Migration Impacts
Activity
Frame Clean Up
Voice Grooming
21CN Voice TCP
installed
Voice Transfer
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% of End
Customers
affected
Timeline to
Migration
Number of
Duration of Voice
Outages per Outage
end User
(Worse case
scenario)
3% 36 - 12 weeks 1 break
prior
Dependent on activity Dependent on
ranges from 30 secs activity ranges
to 3 minutes
from 30 secs to 3
minutes
100% of
migrating
customers
On the night
Time of day
Emergency & Critical
Additional Notes
Voice Calls in Progress
(Non E&C)
Datafreeze Periods
24/7
All reasonable steps will be taken
to ensure that no emergency and
critical calls in progress will be
disconnected during transfer
engineering pre-migration and
migration activities
On rare occasions there
may be a requirement to
maintain elements of the
frame under normal
maintenance conditions
All reasonable steps will be
N/A
taken to ensure that no calls
in progress will be
disconnected during transfer
engineering pre-migration and
migration activities
0 (BB not affected 24/7
by voice transfer)
All reasonable steps will be taken
to ensure that no emergency and
critical calls in progress will be
disconnected during transfer
engineering pre-migration and
migration activities
Both Lines migrating to
21C and lines remaining
on legacy may be
subject to grooming, this
reduces over the course
of migration due to
product withdrawals.
Lines that are not
migrating are still subject
to freeze impacts
All reasonable steps will be
N/A
taken to ensure that no calls
in progress will be
disconnected during transfer
engineering pre-migration and
migration activities
1 break
aiming for 30 secs but 0 (BB not affected 24/7
could be up to 3 mins by voice transfer)
allows for engineering
activities
All reasonable steps will be taken
to ensure that no emergency and
critical calls in progress will be
disconnected during transfer
engineering pre-migration and
migration activities
1 break
3 mins for outgoing
0 (BB not affected 00:00 - 06:00
calls up to 30 mins for by voice transfer)
incoming calls no
tone for outgoing and
ring tone no reply for
incoming
Signalling monitoring will be
applied to agreed E&C numbers
to ensure calls are not in
progress at the point of cutover.
10% 36 - 12 weeks 1 break (but 3 mins
prior
in exceptional
cases
possibly 2)
100% 12 weeks
prior
Duration of BB
Outage
0 All reasonable steps will be
N/A
taken to ensure that no calls
in progress will be
disconnected during transfer
engineering pre-migration and
migration activities
In exceptional cases
where a DLE is migrated
over more than one night
the star services freeze
may affect some non
migrating customers in
addition to those
migrating customers .
This means that some
users may experience
the freeze more than
once. Currentl
Calls in progress will be lost
but special measures in place
for emergency/critical
numbers
6pm - 9am for physical activity such as new
orders, new provides,re arranges on the
migrating DLE but orders will flow through
once the freeze is lifted.
Customers can access and make changes to
their Calling & Network Features up to 10pm
when there will be a freeze implemented that
stops any changes on the old network until
9am. Once connected onto the 21C network
functionality is resumed/available' ,however
any changes made to Calling & Network
Features prior to the end of the freeze period
may be lost
CPE Compatibility Testing:
Progress & Focus
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Testing Update
• PSTN
– Standalone mass market (business & consumer). No significant
problems.
– PBX’s. 1 issue.
– Devices that connect to some form of receiving centre. Current focus. A
very few devices have issues.
• Broadband
– Well down track with Initial testing of 50 ADSL modems &
modem/routers representing all existing chipsets. No problems to date.
• ISDN2/30
– Testing yet to start – Trial ISDN migrations March ’08, Oct ’08 for mass
migration.
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High Priority Categories
• Security
• Telecare
• Telemetry
• ATM
• POS Terminal
• Payphones
• Emergency phones
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We are Collaborating With …..
•
Communications Providers
•
BSIA – British Security Industry Association
•
TSA – Telecare Services Association
•
ENA – Energy Networks Association (Gas & Electricity)
•
WITS – Water Industry Telemetry Standards
•
Environment Agency
•
Link Network
•
Home Office – specifically custodial services
•
APACS – UK Payments Association
•
Payphones
•
CAA/NATS – Civil Aviation Authority & National Air Traffic Services
•
Trinity House – lighthouses, coastguard
•
Fire Industry Associations
•
Network Rail
•
Lifts & Emergency Phones
………… and the list is growing …….
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CPE Compatibility Testing
21CN Testing Database
24
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CPE Test Result Examples
•
Pass
-No problems detected.
-Phone has ragged ringing cadence on 21CN, but same on 20CN.
•
Pass 1 (user perception affected)
-Phone has ragged ringing cadence on 21CN compared to 20CN.
-Telecare CPE alerts on line disconnect (affects migration only).
•
Pass 2 (user operation affected)
-Phone pulse dialling fails on 21CN, user must switch to tone dialling.
-Security CPE requires reset on line reconnect (affects migration only).
•
Partial Fail
-Phone CLI fails, but phone still provides service.
-Security CPE fails to communicate with central receiving centre up to UK
National Transmission Plan limit of 300ms round trip delay.
•
Fail
-PBX fails to detect incoming calls; incoming service effectively lost.
-Security CPE fails to communicate with central receiving centre.
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Information and Reference
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Information Sources
•
General information about 21CN can be found at:
http://www.btplc.com/21cn
•
Information about 21CN and migration can be found at:
http://www.switchedonuk.org
•
BT Supplier Information Notes (SINs) can be found at:
http://www.sinet.bt.com
•
The UK Transmission Plan can be found at:
http://www.nicc.org.uk
•
CPE enquiries: [email protected]
•
The CPE Database can be found at:
http://21cntestingdb.bt.com
To request access:
Use the link on the login page of this database.
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WEBCALLS
Update
29
18 April
Product retirements
24 April
21CN overview
2 May
Migration process
22 May
CPE compatibility testing programme
31 May
Switched-on communications campaign
27 Sept
Migration portal overview
Questions

Answers
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