SDH Serving Nodes Determination at the Point of Handover (A-End)

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SDH Serving Nodes Determination at the Point of
Handover (A-End)
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Agenda

• Published data
• Serving SDH nodes for
• CSH
• ISH
• ISH Extn
• Data
• Process
• Questions

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Published Data

• 5 files are produced
• Postcode to Serving Exchange File (PSEF)
• Supplementary PSEF
• Serving Exchange File
• DPCN file
• SDH Node file
• The files are available on the BTWholesale.com
  website

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Partial Private Circuit pricing - CSH

• CSH SDH serving node is determining by matching
  the postcode to the Main Distribution Frame using
  either the
• Postcode to Serving Exchange File or
• The Supplementary Post code to Serving Exchange
  file.
• The MDF from either of the files above is
  matched in the Serving Exchange file.
• Exceptions-
• Where the postcode is not available, then the
  grid reference is used to determine the charging
  SDH node.
• Where match is to a PDH node, the nearest
  Serving SDH node is used

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Partial Private Circuit pricing - ISH

• ISH node is determining by matching the postcode
  to Serving SDH node where the footway box is
  sited.
• The SDH node is on the Advanced Capacity
  Forecast and the postcode is on the SDH node
  file.
• Exceptions Where match of ISH is at a non SDH
  Serving Exchange, the nearest SDH node is used.

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Partial Private Circuits Pricing ISH Extn

• Network

CP Responsibility
BT Responsibility
CP CSH Building
ISH EXTN Link
SDH node
Footway Box
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Partial Private Circuits Pricing ISH Extn (
Actual Network Routing)
Footway Box
CP Responsibility
BT Responsibility
SDH node
CP CSH Building
ISH EXTN Link
SDH node
Footway Box
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Partial Private Circuit pricing ISH Extn

• Agreement with Industry required
• To use
• The CSH serving SDH node determination
  methodology or
• The ISH Serving SDH node determination
  methodology.
• In most cases, the Serving SDH nodes are the
  same.
• Difference in circuit pricing on ISH and CSH
  methodology
• Where the actual BT fibred Serving SDH node is
  different when compared with the determined SDH
  node from the postcode to MDF match or
• Where the footway box is not at the CP site for
  the PoH building and the postcode of the footway
  box has not been supplied.

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Partial Private Circuits Pricing - ISH Extn

• Impact
• Using the CSH methodology
• Pros
• Footway boxes within the same postcode area will
  calculated from the same SDH node.
• Cons
• CPs must provide the correct postcodes for all
  footway boxes NOT within the CPs site. BT will
  use the CP site for calculation of the circuit
  otherwise.
• All CP circuit orders must have the correct
  postcode of the footway boxes to be valid.
• Where footway box postcode is not available,
  grid reference will be used to determine the
  nearest Serving Exchange node

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Partial Private Circuits Pricing - ISH Extn

• Impact
• Using the ISH methodology
• Pros
• All the postcode data reside within BT systems.
• CPs do not need to supply the footway box
  postcodes to BT.
• CPs do not need to supply the grid reference
  data to BT.
• Con
• Footway boxes within the same postcode area may
  be fibred from different Serving SDH node.
  Therefore comparing the Trunk and Term distances
  from different footway boxes although in the same
  area may not be valid.

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Published Data - Proposal

• Step 1
• Update the Postcode to Exchange files by end by
  31st January 2008.
• Step 2
• All changes to the postcode file will be updated
  quarterly and notified 1 month in advance of the
  effective date.
• Step 3
• All files will be kept on Our networks website
  going forward. Old files to be archived.
• Step 4
• Distance disputes will be calculated using the
  data relevant to the period in which the order
  was raised.
• Step5
• All circuits distances will correlate to the
  distances calculated with input data at the time
  of order. i.e. where the distances are
  calculated by Grid Reference input, the distances
  will remain valid even when postcodes become
  available.
• Step 6
• The ISH SDH node methodology is used for the ISH
  Extn determination

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