| Section
| Date
| Issue
| Size
| Title
|
| SIN 57 | 2016-01-01 | 2.3 | 337.76 KB | BT KiloStream X.21 Interface - Service Description |
| SIN 57 | 2018-05-01 | 2.4 | 343.52 KB | BT KiloStream X.21 Interface - Service Description |
| SIN 57 | 2020-09-01 | 2.5 | 342.06 KB | BT KiloStream X.21 Interface - Service Description |
| SIN 118 | 2014-08-01 | 5.2 | 126.00 KB | BT LAN Extension Services 1, 2, 10 & 10 Local Reach (LES 1, 2, 10 & 10LR) - Service Description |
| SIN 133 | 2017-06-01 | 9.0 | 1.45 MB | The BT Cardway Service - Service Description |
| SIN 158 | 2016-01-01 | 3.5 | 392.60 KB | BT KiloStream n x 64 kbit/s - Service Description |
| SIN 169 | 2015-04-01 | 2.2 | 69.45 KB | BT International MegaStream (2 Mbit/s) - Service Description |
| SIN 171 | 2015-01-01 | 9.3 | 123.85 KB | BT ISDN 2 (Using Limited ETSI Call Control) - Service Description and Withdrawal Notification |
| SIN 182 | 2015-09-01 | 2.3 | 187.98 KB | Payphone Exchange Line Service |
| SIN 218 | 2016-06-01 | 3.1 | 165.63 KB | BT MegaStream 34 - Service Description |
| SIN 222 | 2015-09-01 | 2.9 | 225.13 KB | BT ISDN 30 (DASS) - Service Description |
| SIN 223 | 2016-01-01 | 3.3 | 197.89 KB | BT MegaStream 1, BT MegaStream 2 and BT MegaStream 8 - Service Description |
| SIN 227 | 2015-09-01 | 3.7 | 308.39 KB | CDS Calling Line Identification Service - Service Description |
| SIN 232 | 2015-01-01 | 5.3 | 197.16 KB | BT ISDN 30 (I.421) Service - Service Description and Withdrawal Notification |
| SIN 242 | 2016-11-01 | 2.5 | 624.26 KB | CDS Calling Line Identification Service - Part 1 Idle State, Down Stream Signalling - Part 2 Loop State Signalling - Terminal Equipment Requirements |
| SIN 243 | 2017-04-01 | 4.3 | 187.67 KB | BT ISDN Services - ISDN International Interworking - Technical Information for Suppliers |
| SIN 247 | 2016-01-01 | 1.3 | 273.92 KB | BT International MegaStream 45 - Service Description |
| SIN 251 | 2016-01-01 | 1.7 | 334.60 KB | Private Circuit Services - Evolving Network Modernisation and Its Effect on Analogue Private Circuits - Technical Information for Suppliers |
| SIN 254 | 2016-01-01 | 2.6 | 367.46 KB | BT KiloStream Aggregate Interface - Service Description |
| SIN 258 | 2015-06-01 | 1.5 | 149.55 KB | BT FacilityLine 1 - Service Description |
| SIN 260 | 2016-01-01 | 1.4 | 265.28 KB | BT International MegaStream 34 - Service Description |
| SIN 261 | 2017-04-01 | 5.7 | 786.67 KB | BT ISDN 2e and ISDN 30e Services Using Full ETSI Call Control - Service Description |
| SIN 266 | 2015-06-01 | 1.5 | 138.78 KB | Analogue Presented Vision Circuits - PAL System I Video Standard - Service Description |
| SIN 278 | 2017-12-01 | 2.4 | 1.02 MB | Enhanced Information Service for Emergency Calls - Service Description |
| SIN 284 | 2017-12-01 | 1.7 | 417.87 KB | BT Redcare - Service Description and Technical Information for Suppliers |
| SIN 286 | 2014-08-01 | 2.4 | 93.99 KB | BT LAN Extension Service 155 - Service Description |
| SIN 289 | 2016-02-01 | 2.4 | 293.77 KB | BT MegaStream 155 & BT MegaStream Aggregate - Service Description |
| SIN 290 | 2015-06-01 | 2.5 | 152.95 KB | BT MusicLine One - Service Description |
| SIN 292 | 2016-02-01 | 1.3 | 176.29 KB | BT National MegaStream 45 - Service Description |
| SIN 293 | 2014-08-01 | 2.4 | 93.89 KB | BT LAN Extension Service 622 - Service Description |
| SIN 295 | 2016-12-01 | 1.8 | 190.86 KB | BT Basic X.25 Direct - Service Description |
| SIN 297 | 2014-10-01 | 4.3 | 122.83 KB | BT Featureline - Service Description |
| SIN 300 | 2015-06-01 | 1.3 | 90.93 KB | BT MusicLine 2000 - Service Description |
| SIN 312 | 2015-04-01 | 1.11 | 71.55 KB | BT ISDN Services - Overview |
| SIN 320 | 2015-07-01 | 1.5 | 153.61 KB | Serial Digital Video (SDV) and Associated AES/EBU Digital Audio Circuit(s) - Service Description |
| SIN 323 | 2015-07-01 | 1.5 | 151.32 KB | Switched Serial Digital Video (SDV) and Associated AES/EBU Digital Audio Circuit(s) - Service Description |
| SIN 324 | 2015-10-01 | 3.6 | 292.78 KB | BT Featurenet Embark - Service Description |
| SIN 326 | 2016-01-01 | 1.3 | 339.47 KB | BT International MegaStream 155 - Service Description |
| SIN 333 | 2014-09-01 | 1.3 | 72.72 KB | SDH Customer Interfaces at the STM-N Level (Where N=1, 4, 16) - Interface Characteristics |
| SIN 337 | 2014-09-01 | 2.4 | 87.36 KB | BT MegaStream 622, BT MegaStream Aggregate (STM4) - Service Description |
| SIN 338 | 2014-08-01 | 1.8 | 67.87 KB | BT LAN Extension Service 1000 - Service Description |
| SIN 345 | 2014-08-01 | 1.6 | 96.12 KB | BT Channel Extension Service 1000 - Service Description |
| SIN 346 | 2015-07-01 | 2.11 | 441.73 KB | BT ADSL - Interface Description |
| SIN 349 | 2015-08-01 | 2.5 | 354.90 KB | BT Metallic Path Facility - Interface Description |
| SIN 350 | 2015-04-01 | 1.5 | 54.56 KB | BT Public Switched Telephone Network (PSTN): Network Tones and Announcements |
| SIN 351 | 2021-10-17 | 4.8 | 478.83 KB | BT Public Switched Telephone Network (PSTN): Technical Characteristics of the Single Analogue Line Interface |
| SIN 352 | 2016-06-01 | 2.6 | 356.98 KB | BT Public Switched Telephone Network (PSTN): Technical Characteristics of the Multi-Line Analogue Line Interface |
| SIN 354 | 2018-02-01 | 5.1 | 481.64 KB | BT Public Switched Telephone Network (PSTN): Technical Characteristics of the Supplementary Services Available on the Analogue Line Interface |
| SIN 355 | 2016-01-01 | 1.8 | 364.60 KB | BT Analogue Private Circuits: Tehcnical Characteristics of 2-Wire and 4-Wire Analogue Interfaces |
| SIN 357 | 2015-08-01 | 5.6 | 370.12 KB | BT FeatureNet Service - Technical Characteristics of the Interfaces |
| SIN 359 | 2016-06-01 | 1.5 | 282.55 KB | Next Generation Text Service Also Called Text Relay - Service Description |
| SIN 360 | 2017-04-01 | 4.4 | 422.96 KB | Ethernet Customer Interfaces - Interface Characteristics |
| SIN 367 | 2016-06-01 | 2.6 | 317.66 KB | Characteristics of the BT Network: Electrical Safety and EMC |
| SIN 368 | 2017-07-01 | 1.4 | 100.54 KB | Index of Protocol Implementation Conformance Statements (PICS) for ISDN 2e and ISDN 30e - Customer Interfaces - Technical Information for Suppliers |
| SIN 375 | 2016-04-01 | 1.6 | 258.89 KB | Terminal Equipment Spectral Power Requirements |
| SIN 376 | 2016-08-01 | 1.5 | 408.39 KB | BT Wholesale Broadband SHDSL - Interface Description |
| SIN 377 | 2015-07-01 | 1.7 | 396.51 KB | BT Hosted VoIP Services - Service Description |
| SIN 385 | 2015-10-01 | 3.0 | 575.46 KB | IP Connect UK - Service Description |
| SIN 396 | 2016-01-01 | 3.1 | 381.08 KB | BT Dense Wave Division Multiplex Wavelength Services - Service Description |
| SIN 398 | 2015-04-01 | 1.2 | 62.44 KB | Microconnect Distributed Antennas - Service & Interface Description |
| SIN 407 | 2014-10-01 | 1.5 | 58.58 KB | BT L-Band Relay - Service Description |
| SIN 408 | 2017-09-01 | 2.5 | 171.54 KB | BT Wi-Fi - Service Description |
| SIN 413 | 2016-05-01 | 3.2 | 380.65 KB | Fixed Line SMS Service - Service Description and Interface Specification |
| SIN 429 | 2014-08-01 | 1.4 | 78.68 KB | BT LAN Extension Service 10000 - Service Description |
| SIN 430 | 2009-05-01 | 1.2 | 106.50 KB | BT LAN Extension Service 2500 - Service Description |
| SIN 431 | 2015-02-01 | 1.11 | 251.01 KB | Openreach Wholesale Extension Services 10, Wholesale End to End Extension Services (WES/WEES 10) and Wholesale Extension Service Local Access 10 (WES-LA 10) - Service & Interface Description |
| SIN 432 | 2015-02-01 | 1.8 | 113.16 KB | Openreach Wholesale Extension Services 10 and Wholesale End to End Extension Services Local Reach (WES/WEES 10LR) - Service Description |
| SIN 433 | 2015-02-01 | 1.10 | 185.07 KB | Openreach Wholesale Extension Service 100 (WES 100), Wholesale End to End Extension Services 100 (WEES 100) and Wholesale Extension Service Local Access 100 (WES-LA 100) - Service & Interface Description |
| SIN 434 | 2015-02-01 | 1.8 | 179.42 KB | Openreach Wholesale Extension Service 155 (WES 155) and Wholesale End to End Extension Services 155 (WEES 155) - Service & Interface Description |
| SIN 435 | 2015-02-01 | 1.8 | 175.46 KB | Openreach Wholesale Extension Service 622 (WES622) and Wholesale End to End Extension Services 622 (WEES622) - Service & Interface Description |
| SIN 436 | 2015-02-01 | 1.10 | 236.35 KB | Openreach Wholesale Extension Service 1000 LAN & 1000ER (WES 1000 LAN, WES1000ER), Wholesale End to End Extension Service 1000 & 1000ER (WEES 1000 LAN, WEES 1000ER) and Wholesale Extension Service Local Access 1000 LAN (WES-LA 1000 LAN) |
| SIN 437 | 2015-02-01 | 1.8 | 103.40 KB | Openreach Wholesale Extension Service 1000 SAN (WES1000 SAN), Wholesale End to End Extension Service 1000 SAN (WEES1000 SAN) and Wholesale Extension Local Access Services 1000 SAN (WES-LA 1000 SAN) |
| SIN 444 | 2015-04-01 | 1.6 | 117.06 KB | Openreach Backhaul Extension Services 10 (BES 10) - Service & Interface Description |
| SIN 445 | 2015-04-01 | 1.6 | 148.26 KB | Openreach Backhaul Extension Services 100 (BES 100) - Service & Interface Description |
| SIN 446 | 2015-04-01 | 1.6 | 162.82 KB | Openreach Backhaul Extension Services 155 (BES 155) - Service & Interface Description |
| SIN 447 | 2015-04-01 | 1.6 | 164.73 KB | Openreach Backhaul Extension Services 622 (BES 622) - Service & Interface Description |
| SIN 448 | 2015-04-01 | 1.6 | 133.20 KB | Openreach Backhaul Extension Services 1000/1000ER (BES 1000/1000ER) - Service & Interface Description |
| SIN 453 | 2015-04-01 | 2.1 | 139.73 KB | BE Dense Wave Division Multiplex 10G Wavelength Services - Service & Interface Description |
| SIN 458 | 2016-01-01 | 2.2 | 511.06 KB | Openreach Backhaul Network Services (BNS) - Service & Interface Description |
| SIN 459 | 2016-08-01 | 1.6 | 399.78 KB | Openreach Wholesale Extension Services 2500 (WES 2500) and Wholesale End to End Extension Services 2500 (WEES 2500) - Service Description |
| SIN 460 | 2016-06-01 | 1.6 | 341.07 KB | Openreach Wholesale Extension Services 10000 (WES 10000) and Wholesale End to End Extension Services (WEES 10000) - Service Description |
| SIN 463 | 2016-06-01 | 1.4 | 227.29 KB | Openreach Backhaul Extension Services 10000 (BES 10000) - Service Description |
| SIN 465 | 2016-06-01 | 1.9 | 618.62 KB | Openreach WES Aggregation Service - Service & Interface Description |
| SIN 466 | 2016-01-01 | 2.3 | 623.23 KB | Openreach Network Backhaul Services - Service & Interface Description |
| SIN 468 | 2014-05-01 | 1.4 | 286.06 KB | Openreach Street Access - Service & Interface Description |
| SIN 470 | 2015-04-01 | 2.1 | 95.08 KB | External NTE for the PSTN Single Analogue Line Interface - Service & Interface Description |
| SIN 471 | 2016-08-01 | 3.6 | 873.21 KB | BT Wholesale Broadband Managed Connect Shared - Service Description |
| SIN 472 | 2017-06-01 | 2.8 | 1.29 MB | BT Wholesale Broadband Connect (WBC) Products - Service Description |
| SIN 473 | 2014-12-01 | 2.1 | 302.02 KB | Broadcast Access: 140 Mbit/s - Service and Interface Description |
| SIN 474 | 2014-08-01 | 4.0 | 150.12 KB | Broadcast Access: 270 Mbit/s - Service and Interface Description |
| SIN 475 | 2014-08-01 | 4.0 | 152.01 KB | Broadcast Access: 1.485 Gbit/s - Service and Interface Description |
| SIN 476 | 2017-04-01 | 1.14 | 622.53 KB | BT Downstream 21CN Ethernet Services - Service Description |
| SIN 478 | 2014-12-01 | 1.2 | 139.31 KB | Openreach CCTV Access (Uncompressed) - Service & Interface Description |
| SIN 479 | 2014-12-01 | 1.2 | 146.38 KB | Openreach CCTV Access (Compressed) - Service & Interface Description |
| SIN 480 | 2017-07-01 | 2.2 | 485.49 KB | Openreach Ethernet Backhaul Direct (EBD) - Service & Interface Description |
| SIN 481 | 2016-08-01 | 1.3 | 556.58 KB | Openreach Bulk Transport Link (BTL) - Service & Interface Description |
| SIN 482 | 2015-12-01 | 1.14 | 681.15 KB | BT IPstream Connect - Service Description |
| SIN 485 | 2015-10-01 | 1.3 | 410.87 KB | BT IPstream Connect Office, BT IPstream Connect Home, BT IPstream Connect Max & BT IPstream Connect Max Premium Products - Service Description and Interface Specification |
| SIN 487 | 2015-08-01 | 1.3 | 245.71 KB | BT IPstream Connect Symmetric - Service Description and Interface Specification |
| SIN 488 | 2015-01-01 | 1.2 | 82.83 KB | Synchronisation - Recommended Settings for Customer Premises Equipment |
| SIN 489 | 2017-12-01 | 3.7 | 1.06 MB | Optical Spectrum Access - Service & Interface Description |
| SIN 490 | 2016-08-01 | 7.2 | 541.21 KB | Optical Spectrum Extended Access - Service & Interface Description |
| SIN 492 | 2014-04-01 | 1.8 | 291.20 KB | Ethernet Access Direct (EAD) Inc EAD Enable and Ethernet Access Direct Local Access - Service & Interface Description |
| SIN 495 | 2016-01-01 | 1.2 | 447.19 KB | BT Wholesale Broadband Connect Fibre to the Cabinet Service - Service Description |
| SIN 496 | 2015-09-01 | 1.2 | 233.59 KB | BT IPstream Connect SID for Authentication - Service & Interface Description |
| SIN 497 | 2015-09-01 | 1.1 | 214.66 KB | BT IPstream Connect SID for Accounting - Service & Interface Description |
| SIN 498 | 2017-01-01 | 7.3 | 2.10 MB | Generic Ethernet Access - Fibre to the Cabinet (GEA-FTTC) - Service and Interface Description |
| SIN 502 | 2014-09-01 | 1.1 | 137.63 KB | BT IPstream Connect Session Steering - Service & Interface Description |
| SIN 503 | 2015-01-01 | 1.3 | 95.15 KB | Generic Ethernet Access - Multicast - Service & Interface Description |
| SIN 506 | 2017-11-01 | 1.5 | 776.21 KB | Fibre to the Premises (FTTP) Generic Ethernet Access - Service and Interface Description |
| SIN 507 | 2014-08-01 | 3.0 | 97.94 KB | Broadcast Access: 3 Gbit/s - Service Interface Description |
| SIN 508 | 2016-08-01 | 1.2 | 412.72 KB | Openreach Time Division Multiplex Access Bearer Services (TDM Access) - Service Description |
| SIN 509 | 2013-03-01 | 1.2 | 169.72 KB | BT Wholesale Broadband Connect (WBC) Fibre to the Premise (FTTP) - Service & Interface Description |
| SIN 510 | 2016-08-01 | 1.1 | 473.81 KB | Openreach Time Division Multiplex (TDM) Backhaul Bearer Service - Service & Interface Description |
| SIN 511 | 2017-12-01 | 2.0 | 934.45 KB | BT Wholesale TV Connect (TVC) - Service & Interface Description |
| SIN 513 | 2016-01-01 | 1.1 | 370.44 KB | BT Dense Wave Division Multiplex 40G Wavelength Services - Service & Interface Description |
| SIN 514 | 2017-09-01 | 1.5 | 608.64 KB | Optical Spectrum Extended Access 6500 (OSEA 6500) - Service & Interface Description |
| SIN 515 | 2017-03-01 | 2.1 | 1.10 MB | Optical Spectrum Access - Hub and Spoke - Service & Interface Description |
| SIN 516 | 2016-03-01 | 2.0 | 306.94 KB | 21CN Optical Solution - Service & Interface Description |
| SIN 519 | 2015-07-01 | 1.0 | 767.12 KB | Ethernet Access Direct (EAD) 10000 - Service & Interface Description |
| SPIN 080 | 2017-09-01 | 1.1 | 265.76 KB | Fixed Line SMS |
| STIN 517 | 2018-03-01 | 1.3 | 1.55 MB | Single Order Generic Ethernet Access (SOGEA) over VDSL2 and G.fast - Service & Interface Description |
| STIN 520 | 2017-09-01 | 2.0 | 1.15 MB | GEA-NGA2 G.fast Pilot - Service and Interface Description |
| STIN 521 | 2017-07-01 | 1.1 | 999.57 KB | Dark Fibre Access (DFA) - Technical Information for Suppliers |
| STIN 522 | 2016-08-01 | 1 | 455.78 KB | Long Reach VDSL (LR-VDSL) Trial |