Pathfinder Working Group

1
Pathfinder Working Group

• BT Centre Showcase,
• Registration 9.45 am
• Start time 10.00 am

2
Pathfinder Working Group - Agenda

• .Introductions
• .Terms of reference and objectives of Pathfinder
  Working Group
• .Cardiff - The facts of Interconnection 
• .BTs view of technical issues/risks inherent in
  a hybrid interconnection model during Pathfinder
• .Proposed transfer methodology from DLE to NGS
• .Requirements for Pathfinder Programme - a free
  form brainstorming session designed to deliver a
  set of requirements specific to Pathfinder.
• .AOB
• Customer Communication Plan
• TSG Update

3
Pathfinder Working Group

• Working Group Terms of Reference
• Keith Fowler - Pathfinder Programme Manager.

4
Pathfinder Working Group

• Membership
• Industry representatives and BT Wholesale
  (co-chair arrangement)
• Proposed Terms of Reference
• Phase 1 (now until June 05)
• Agree to conditions for collaboration during the
  Pathfinder period (Out of service Oct 05 Dec
  05, In service Jan 06 March 06)
• Capture Pathfinder Requirements from BTW
  Customers (close by 28-Feb) This has already
  begun through one-on-one calls
• Agree to measurement points and reporting
  structure to provide all Pathfinder participants
  equal access to experiences and information
• Phase 2 (July 05 April 06)
• Issue of System Alternation Notices for Cardiff
  DLEs
• Trial Industry collaboration in the migration of
• Interconnect (target beginning migration Oct 05)
• End Customers (mass migration Jan-Mar 06)
• Review of experiences and results
• Working Group Scope
• All matters relating to migration of interconnect
  arrangements and consumer and business customers
  to a 21CN environment, while not overlapping
  other working groups.
• Meeting Frequency
• Monthly or more frequently as required

5
Pathfinder Working Group

• Within Scope of Pathfinder Working Group
• Determine criteria for collaboration during this
  period
• Issue of System Alteration Notifications in July
• Defined methodology for movement of end customer
  lines
• Defined methodology for movement of services
• Defined additional reporting requirements to test
  effectiveness of trial.
• Outside Scope of Pathfinder Working Group
• An agreed technical arrangement to enable DLE
  closure (Interconnect Working Group)
• Agreed commercial arrangements for rearranging
  interconnects
• Charging Principles (Interconnect Working Group)
• Contract Alterations (Standard Contracts Forum)
• Future interconnect (IP, etc.) (Interconnect
  Working Group)
• LLU (Broadband and LLU Working Group)
• Any other workgroup themes

6
Pathfinder Working Group

• Cardiff The facts of Interconnection
• Mark Ward, Head of Interconnect Numbering
  Services

7
Cardiff Pathfinder area - Current Interconnect
Arrangements

• 9 impacted DLEs - 7 in Cardiff, plus Bridgend
  and Pontypridd
• Cardiff DLE units CF/TY, CF/UC, CF/UD, CF/UE,
  CF/UF, CF/UG, CF/UL
• Bridgend DLE unit BNP/DA Pontypridd DLE unit
  PN/DA
• All Cardiff DLE units are co-located with
  Cardiff Iolite NGS
• 7 impacted Altnets
• 80 of circuits from 3 Altnets
• Volumes are for all interconnect E1s, including
  FRIACO

8
Pathfinder Working Group

• BTs view of technical issues/risks inherent in a
  hybrid interconnection model during Pathfinder

9
Risks and Issues associated with Interconnection
arrangements and Pathfinder.

• Risks-
• Non Movement of CP DLE Capacity prior to
  Pathfinder could result in-
• Increased risk of call routing errors due to a
  complex data set
• (21CN legacy network CPs network)
• Increased risk of QoS issues e.g. call routing
  errors over-used capacity
• Any Operational issues resulting would cause
  increased manpower demands on both BT and CPs
• Complication of eventual movement of Capacity
  prior to DLE closure.
• Failure to fully test the full 21CN migration
  process and amend process if required

10
Risks and Issues associated with Interconnection
arrangements and Pathfinder.

• Issues
• Known issues include-
• Billing in line with commercial offer - EBC?
• Some unsupported products post end-customer
  transfer e.g RBWF
• Trial Contract
• CPS SAD calls
• Prove designs for continuity of Interconnect
  products to/from end customers.
• Fall Back arrangements and criteria.
• Availability of new 21C Interconnect Products

11
Mitigating Risks

• Goal is to migrate CP Interconnect prior to DLE
  end-user migration
• Provide sufficient time to assure stability for
  all
• Avoid complex routing (21CN - NGS -CP)
• Avoid need to replicate legacy/PSTN routings and
  data structures
• Minimize impact on perceived QoS (complex call
  routing/tromboning)
• Can migrate CP circuits over time without need
  for whole DLE at once migration
• Disengage CP circuits from actual DLE closures
• Pathfinder offers the opportunity to collaborate
  on the full migration process
• Trial methodology for moving CP Interconnect
  circuits over time (not directly tied to mass
  migration schedule)
• Trial methodology for migrating end-users whole
  DLE at once
• Provide feedback to improve processes prior to
  main 21C roll-out

12
Pathfinder Working Group

• Proposed Transfer Methodology from DLE to NGS

13
Legacy TDM Support - Transfer Engineering
Proposals

• Aims -
• To de-risk the transfers by use of existing NGS
  switches and network routings.
• To provide separation of agreed transfer
  activities from progress on 21C build and DLE
  closures.
• To enable balanced workload for all.
• Scenarios -
• 4 that will apply in most circumstances - mix
  and match.
• Last 2 may apply to balance NGS capacity
• Not exhaustive - other options inc. Ceasing
  Capacity, new 21C products etc.
• Not prescriptive - subject to bi-lateral
  agreement with each individual customer.

14
DLE SITE
?
NGS
2 1 C N
DLE 2
M G W
METRO NODE
3 E1s
CP Switch
13 E1s
NGS SITE
BT Capacity
CP Capacity
Figure 1a - Configuration 1 - ISI Direct to
DLE and NGS Sites No Spare NGS CP Route Capacity
- Interconnect Scenario Before Transfer
15
DLE SITE
?
NGS
2 1 C N
DLE 2
M G W
METRO NODE
3 E1s
3 E1s
CP Switch
13 E1s
NGS SITE
BT Capacity
CP Capacity
Figure 1b - Configuration 1 - ISI Direct to
DLE and NGS Sites No Spare NGS CP Route Capacity
- Interconnect Scenario After Transfer
16
NGS
2 1 C N
M G W
METRO NODE
13 E1s
?
CP Switch
DLE 2
3 E1s
IEC
DLE SITE
NGS SITE
BT Capacity
CP Capacity
Figure 3a - Configuration 3 - ISI Direct to
NGS Site with IEC to DLE Site No Spare NGS CP
Route Capacity - Interconnect Scenario Before
Transfer
17
NGS
2 1 C N
M G W
METRO NODE
13 E1s
?
CP Switch
DLE 2
3 E1s
DLE SITE
NGS SITE
BT Capacity
CP Capacity
Figure 3b - Configuration 3 - ISI Direct to
NGS Site with IEC to DLE Site No Spare NGS CP
Route Capacity - Interconnect Scenario After
Transfer
18
DLE SITE
?
NGS
DLE 2
2 1 C N
M G W
METRO NODE
NON PARENT NGS SITE
CP Switch
NGS
3 E1s
BT Capacity
13 E1s
CP Capacity
IEC
PARENT NGS SITE
Figure 6a - Configuration 6 - ISI Direct to NGS
Site with IEC to DLE Site No CP Route to Non
Parent NGS - Interconnect Scenario Before Transfer
19
New Route (if not already existing)
DLE SITE
?
NGS
DLE 2
2 1 C N
M G W
METRO NODE
NON PARENT NGS SITE
CP Switch
NGS
3 E1s
13 E1s
BT Capacity
CP Capacity
3 E1s
PARENT NGS SITE
Figure 6b - Configuration 6 - ISI Direct to NGS
Site with IEC to DLE Site No CP Route to Non
Parent NGS - Interconnect Scenario After Transfer
20

• Requirements Capture for Pathfinder Programme.

21
Pathfinder Working Group

• Within Scope of Pathfinder Working Group
• Determine criteria for collaboration during this
  period
• Issue of System Alteration Notifications in July
• Defined methodology for movement of end customer
  lines
• Defined methodology for movement of services
• Defined additional reporting requirements to test
  effectiveness of trial.
• Outside Scope of Pathfinder Working Group
• An agreed technical arrangement to enable DLE
  closure (Interconnect Working Group)
• Agreed commercial arrangements for rearranging
  interconnects
• Charging Principles (Interconnect Working Group)
• Contract Alterations (Standard Contracts Forum)
• Future interconnect (IP, etc.) (Interconnect
  Working Group)
• LLU (Broadband and LLU Working Group)
• Any other workgroup themes

22

• ADDITIONAL TRANSFER ENGINEERING SLIDES FOR
  INFORMATION ONLY

23
DLE SITE
?
NGS
2 1 C N
DLE 2
M G W
METRO NODE
3 E1s
CP Switch
13 E1s 10 used for BH traffic
NGS SITE
BT Capacity
CP Capacity
Figure 2a - Configuration 2 - ISI Direct to
DLE and NGS Sites Spare NGS CP Route Capacity -
Interconnect Scenario Before Transfer
24
DLE SITE
?
NGS
2 1 C N
DLE 2
M G W
METRO NODE
CP Switch
3 E1s
10 E1s
NGS SITE
BT Capacity
CP Capacity
Figure 2b - Configuration 2 - ISI Direct to
DLE and NGS Sites Spare NGS CP Route Capacity -
Interconnect Scenario After Transfer
25
NGS
2 1 C N
M G W
METRO NODE
13 E1s
10 used for BH traffic
?
CP Switch
DLE 2
3 E1s
IEC
DLE SITE
NGS SITE
BT Capacity
CP Capacity
Figure 4a - Configuration 4 - ISI Direct to NGS
Site with IEC to DLE Site Spare NGS CP Route
Capacity - Interconnect Scenario Before Transfer
26
NGS
2 1 C N
M G W
METRO NODE
10 E1s
?
3 E1s
CP Switch
DLE 2
DLE SITE
NGS SITE
BT Capacity
CP Capacity
Figure 4b - Configuration 4 - ISI Direct to NGS
Site with IEC to DLE Site Spare NGS CP Route
Capacity - Interconnect Scenario After Transfer
27
DLE SITE
?
NGS
DLE 2
3 E1s
2 1 C N
NON PARENT NGS SITE
M G W
METRO NODE
CP
NGS
13 E1s
PARENT NGS SITE
BT Capacity
CP Capacity
Figure 5a - Configuration 5 - ISI Direct to DLE
and NGS Sites No CP Route to Non Parent NGS -
Interconnect Scenario Before Transfer
28
DLE SITE
?
NGS
DLE 2
3 E1s
3 E1s
2 1 C N
NON PARENT NGS SITE
M G W
METRO NODE
CP
NGS
13 E1s
BT provided (funded)
CP provided (funded)
PARENT NGS SITE
Figure 5b - Configuration 5 - ISI Direct to DLE
and NGS Sites No CP Route to Non Parent NGS -
Interconnect Scenario After Transfer