FTN design & development specification (D&D)
SP FTN (D&D) 017
Specification for As-Built Records for Cables and Cable Route
Issue 4.1, Feb 2010 · FTN D&D specs & typical drawings
Sets out the data fields the As-Built spreadsheet must hold for every FTN cable, joint, termination, cabinet, screening conductor and route element, and which phase (survey, design, construction) fills them. Used by surveyors, designers and routeworks contractors.
Clause map — what each clause deals with
| 1 | Introduction | Why completed-state records of FTN cables and routes are needed for condition monitoring and maintenance. |
| 2 | Abbreviations | Abbreviations used (ATEH, DBS, DI-SAC, ELR, GLT, MP, OSGR, OHLE, SC, UTX, URX, WHD). |
| 3 | Glossary | Defines the roles (Surveyor, Designer, Constructor), Design Submission, up/down direction, feature, route section, route transition, track offset, green zone. |
| 4 | Scope | What the cable and route As-Built record covers and what is handled elsewhere (nodes, data system, circuit allocation). |
| 5 | Approach | Phased data entry into one spreadsheet (survey, design, construction), colour-coded fields, who owns correctness at submission, the four end uses of the record. |
| 5.1 | Network Maintenance | What maintainers need from the record (fast identification, location, element details). |
| 5.2 | Network Management | What network managers need (routing, capacity use and availability). |
| 5.3 | Network Provisioning | What circuit provisioning needs, including spotting diverse-route conflicts. |
| 5.4 | Network Growth | What network growth planning needs; data fields in section 6 are built to satisfy 5.1 to 5.4. |
| 5.5 | Accuracy of OSGRs | Required digit resolution for eastings and northings, how to pad GPS readings and the accuracy penalty of placeholder zeros. |
| 5.6 | Accuracy of Measurements Using ELR References | How to express ELR chainage: metres from the nearest quarter milepost in the up direction, positive integers. |
| 6 | Capture of Data on Network Elements | Who enters what (surveyor red fields, designer green), spreadsheet unique reference and version format, management of a single live spreadsheet, Excel format, field naming convention. |
| 6.1 | Optical Fibre Cable Lengths | Fields per joint-to-joint fibre cable length: ID, make-up, refractive index, end joint/termination IDs, manufacturer, sheath number, armour, sheath type, installer, dates, test report. DI-SAC handling. |
| 6.2 | Optical Fibre Joints | Fields per fibre joint: ID, tray counts, tubes spliced/through/spurred, splicing drawing, closure type, OSGR, ELR, track offset, dimensions, position, dates, green zone, nearest access point. |
| 6.3 | Optical Fibre Spur Cable Length | Fields per spur cable length, same as 6.1 plus the ID of the joint it spurs from. |
| 6.4 | Optical Fibre Terminations | How termination IDs are formed from node ID plus letter; fields for cables terminated, tray counts, all fibres terminated, type, dimensions, position, dates. |
| 6.5 | Copper Cable Lengths | Fields per copper cable length: ID, end node/cabinet/joint IDs, pairs, conductor diameter, manufacturer, sheath, armour, position, installer, dates, test report. |
| 6.6 | Copper Joints | CJ-nnnnnn ID format from a Network Rail allocated range, then fields: OSGR, ELR, host cable ID, pairs, closure type, offset, dimensions, position, dates, test report. |
| 6.7 | Copper stub length | Fields per copper stub cable length, mirroring 6.5 with termination/joint IDs at each end. |
| 6.8 | Copper Terminations | Copper termination IDs from cabinet/node ID plus vertical letter; fields for cables terminated, termination type, accommodation, rig drawing, dates, test report. |
| 6.9 | Distribution Cabinets | Fields per distribution cabinet: ID, termination IDs, circuits, repeater housings, model, OSGR, ELR, offset, dimensions, position, dates, schematic drawing, green zone, nearest access point. |
| 6.10 | Screening Conductor | Fields per screening conductor: ID, manufacturer, conductor size, position, installer, dates, test report. |
| 6.11 | Screening Conductor Joints | Fields per screening conductor joint: OSGR, ELR, type, offset, dimensions, position, dates, green zone, green zone access, nearest access point. |
| 6.12 | Screening Conductor Earths | Fields per screening earth: ID, parent conductor ID, number of rods or other configuration, offset, position, dates, green zone, access. |
| 6.13 | Cable Route | Route-section and feature model, RS/MH/RJ/TP/LL ID formats with contract-area digits, lid lift concept. Route recording withdrawn this issue; text kept greyed. |
| 6.13.1 | Route Sections | Fields per route section: end feature IDs, cables, position, route type, material, size, offset, contractor, date, drawing, UTX/URX duct counts and condition. |
| 6.13.2 | Lid Lift points | Fields per lid lift point (every 100 m per SP/FTN(SU)/001): spare capacity estimate, OSGR, ELR, offset, position. |
| 6.13.3 | Manholes | Fields per manhole: dimensions, material, ducts in/out, OSGR, ELR, position, application, lid safe load, date built, green zone, access, hazards, nearest access point. |
| 6.13.4 | Route Transition Point | Fields per route transition: application (type/size change), spare capacity in the smaller route, position, OSGR, ELR, offset. |
| 6.13.5 | Route Junction | Fields per route junction: spare capacity in the smaller route, position, OSGR, ELR, offset. |
| 6.14 | Double-Insulated Super Armoured Cable (DI-SAC) | How DI-SAC lengths are recorded (SF fields mirroring fibre cable lengths), when route records still apply, supersedes FTN/HQ/SP/1001; several fields removed. |
| 6.15 | DI-SAC Anchor Points | Only anchor points next to each milepost or quarter milepost are recorded: ID, ELR/MP, track offset to one decimal, track detail per Sectional Appendix. |
| 6.16 | Directly Buried Sub-duct | Requirement withdrawn. |
| 6.17 | Directly Buried Sub-duct Anchor Points | Requirement withdrawn. |
| 7 | References | Points to SP/FTN(SU)/001 surveys and SP/FTN(D&D)/016 labelling. |