Potru · GPON → XGS-PON · Asturcón Network FTTH Renewal (CON 06/2025)

Territory

7 geographic areas · 20 primary nodes · 9 passive secondary nodes

The network reaches 24 of Asturias's 78 municipalities (concejos). Solid circles are primary nodes (with an OLT to renew); hollow ones are secondary nodes: sites with no electronics, only passive optical splitters hung off a primary node by fibre — the renewal doesn't touch them. The small dots are the towns served from each node. Click any node for its record, or start the guided tour.

Own fibre (e.g. Cudillero–Vegadeo, Autovía Minera) Leased fibre + CWDM (e.g. Cudillero–Gijón, south-east)

Transport systems at the PAO · channel-by-channel occupancyCWDM 8133 · Occidental8/8 · no vacanciesCWDM 8140 · Suroccidental2/4 · 2 FREECWDM 8133 · Suroriental / Oriental (compartido)8/8 · no vacanciesCaudal / Aller / NalónDIRECT fibres to the Mieres 7750 · no CWDM⚠ 7750SR-7 router: only 1 free 10 Gbps port on the whole chassis
Own trunk · AS-I motorway Mieres–Gijón (schematic cross-section)coresheath1234567812345678Split-off → Nalón basincyan ring = split offtoward Langreo / Blimeatubes 6–8SPLIT OFF →Nalón basintubes 1–5 (illustr.)Gijón ↔ MieresOWN fibre through the Autovía Minera ducting · Caudal, Aller and Nalón reach the Mieres 7750 over direct fibre, with no transport equipment. Tube allocation is illustrative; the split toward the Nalón is literal from the pliego.
Own cable TRONSCPLEFO32 · 32 fibres · Mieres–Pola de Lenacoresheath123412345678Typical tube · 8 fibresfibre colours per the TIA-598 standardtubes 1–4 · 32 own fibresMieres ↔ Pola de Lena
Cable TROMIENSCFO128 · 128 fibres · 16 tubescoresheath1234567891011121314151612345678Tube 16 · extended → VillallanaVillallana FTTH accessfrom Pola de Lenatube 16extended → VILLALLANAtubes 1–15Mieres trunk network(no breakdown)Morcín: LEASED fibre · Aller basin: LEASED over the ADIF Santa Cruz de Mieres–Collanzo railway; the Collanzo–Felechosa stretch belongs to another owner.
Cable CUDILLERO–CASTROPOL · 64 fibres · 8 tubes × 8 fibres (via ADIF)coresheath123✕4567812345678Tube 1 · transport Luarca→Cudillero2 used6 freeOLT frames → leased pairto Gijón (2 fibres)12345678Tube 2/1 · transport Navia→Luarca5 used3 freetube 1 in Navia · continuesas tube 2 in Luarca12345678✕Tube 3 · dead end (split off inTapia)tubes 3–8 unsplicedtoward CudilleroTUBE 3 · DEAD ENDsplit off in TapiaTUBES 4–8 · ACCESSPto. Vega · Figueras· La CaridadCyan ring = tubes 4–8 for ACCESS, split off in Puerto de Vega (Navia), Figueras (Castropol) and La Caridad (Tapia) · Tapia–Castropol: 3 used/5 free · electro-optical regenerators in Navia, Luarca and Muros · distances: Castropol–Tapia 19 km · Tapia–Navia 16 · Navia–Luarca 22 · Luarca–Muros 49 · Muros–Gijón 60
Cable CASTROPOL–VEGADEO · 96 fibres · 12 tubes × 8 fibrescoresheath12345678910111212345678Tubes 1–12 → Vegadeo and BarresaccessTUBES 1–12 · ACCESSVegadeo and Barres
CWDM 8133 breakdown, Muros de Nalón → Gijón (colours normalised by λ)2 leased fibres (pair) → GijónCWDM MUX1471 nm · grisOLT Tapia de Casariego1491 nm · violetaOLT Castropol1511 nm · azulFREE1531 nm · verdeHospital de Jarrio1551 nm · amarilloHospital de Jarrio1571 nm · naranjaOLT Muros de Nalón1591 nm · rojoOLT Navia1611 nm · marrónOLT LuarcaAll λ share the 2 leased fibres pair (cable FO GIJÓN–AVILÉS–MUROS–CUDILLERO, ≈60 km) · losses after filters: 21 dB · expandable from 8 to 16 channels
CWDM 8140 (at the PAO)2/4 · 2 freeCWDM 8133 in Tineo · channels 5–8 dedicated to the Hospital2 leased fibres (pair) → GijónCWDM MUX1551 nm · amarilloHospital Carmen y Severo Ochoa1571 nm · naranjaHospital Carmen y Severo Ochoa1591 nm · rojoHospital Carmen y Severo Ochoa1611 nm · marrónHospital Carmen y Severo Ochoa2× Transmode 5800 units carry the hospital's 4 frames · another 2× 5800 units carry the 6 frames (3+3) of the Cangas del Narcea OLTs
CWDM 8133 · Gijón–Nava–Infiesto–Arriondas–Llanes (side W · direct route)2 leased fibres (pair) → GijónCWDM MUX1471 nm · grisOLT Llanes1491 nm · violetaOLT Arriondas · redundant1511 nm · azulOLT Colombres1531 nm · verdeHospital Grande Covián · Ring 71551 nm · amarilloHospital Grande Covián · Ring 71571 nm · naranjaOLT Llanes1591 nm · rojoOLT Infiesto · redundant1611 nm · marrónOLT Nava · redundantRedundant across two identical sides: side W (interior, the one above) and side E (coast, via Llanes) · no vacant carrier or transport facilities · channels 2–3 also feed a local ring (2× Transmode 5810, "Ring 7") dedicated to the Hospital Grande Covián in Arriondas
CWDM 8140 · Llanes–Colombres (side E) · Colombres redundant route2 leased fibres (pair) → GijónCWDM MUX1471 nm · grisFREE1491 nm · violetaOLT Colombres · redundant1591 nm · rojoFREE1611 nm · marrónOLT Colombres · redundantMirrored by a CWDM 8140 (side W) in Llanes · Colombres' MAIN link runs over channel 1 of the CWDM 8133 shared with the Southeast (previous panel) — this 8140 is only the backup route · channels 5–8 sit on the same wavelength grid as the previous table, and Colombres' own fiche does not repeat the nm values · the PAO's general equipment summary lists this area as "CWDM 8133, 8 channels, all occupied" — the same figure as the Southeast; the figure transcribed here is the more specific one from the node's own fiche

    redundant routemain route
    If the main route fails, the East's and Southeast's frames return to the PAO over the second route from Llanes

    Link per OLT today1 Gbps

    Renewed link≥ 10 Gbps end to end
Priority to vacant direct carriers; CWDM or new contractor equipment where none are available · headend nodes may chain their area

Starting point

Current architecture of the Asturcón Network

A public, neutral, wholesale FTTH network, operated by GIT since 2004 to bring broadband where private operators don't deploy. Retail operators run their services (HSI, TVoIP, VoD, VoIP, RF CATV and POTS telephony) over the same ONT, with transparent connectivity through to the PAO.

User

ONT

Active terminal in the home. Connects the operator's services to the drop fibre.

Access network

Splitters 1:16 → 1:4

Primary and secondary passive network. Final optical split 1×4×16 = 64 users/fibre (Cangas del Narcea: 1:32). 806 PON networks.

Active

Primary node · OLT

20 nodes with an Alcatel 7342 (R4.8.13) or Ericsson BLM 1500 (R8.4.0) OLT, CATV injection, DC power, batteries and transmission.

Passive

Secondary node

No electronics: optical splitters hung off a primary node by fibre. The general pliego cites 5, but the area-by-area records detail 9: Vegadeo, La Caridad and Soto del Barco (W.), Cabranes and Villamayor (SE.), and El Entrego, Sotrondio, Barredos and Pola de Laviana (Nalón).

Transport

Trunk networks

High-capacity own fibre or leased fibre with CWDM Transmode (5800 / 8133 / 8140) to the PAO.

Interconnection

PAO Gijón

Alcatel 7750SR-7 router at 100% occupancy. Operator cages, POTS V5.2 gateways and auxiliary equipment.

ONT fleet in service

The fleet's age and variety is why the contract's variable part supplies up to 7,000 new GPON ONTs.

The technology

Two generations on the same strand

GPON · what's there

2.5 Gbps downstream · 1.2 Gbps upstream · shared

One fibre leaves the OLT and a passive splitter divides it among up to 64 homes. The bandwidth belongs to the group, not to each house.

XGS-PON · what's coming

10 Gbps downstream · 10 Gbps upstream · shared

Same fibre, same splitters, same ducting. What changes is the electronics at both ends: the node's OLT and the living room's ONT.

The two generations coexist on the same fibre because they work on different wavelengths. That's why the migration can happen node by node and user by user, without ever switching the network off: while one neighbour's ONT has already been swapped, the one next door keeps running GPON on the very same cable.

⚠ This figure doesn't come from the pliego. The bands are the ones set by the ITU-T G.984.2 (GPON) and G.9807.1 (XGS-PON) standards; RF video, by G.984.5. Pliego CON 06/2025 names the technologies, not necessarily their wavelengths. It's labelled as a standard, not as data from the file.

Purpose of the contract

Planned actions

A closed-scope, turnkey fixed part plus a variable part activated as needed. Each action lists the nodes it affects: click a name to open its record.

Fixed part

PF-1 Renewal of the 20 nodes

20 new OLT units with dual GPON / XGS-PON technology, independent of the current network
Architecture and operational design proposed by the bidder
Comprehensive element-management system + technical consultation

Nodes affected: Muros de Nalón · Luarca · Navia · Castropol · Tapia de Casariego · Tineo · Cangas del Narcea · Mieres · Pola de Lena · Santa Eulalia de Morcín · Moreda · Cabañaquinta · Felechosa · Blimea · Langreo · Arriondas · Infiesto · Nava · Llanes · Colombres

PF-2 Auxiliary elements

A complete test node (mock-up) at GIT's Oviedo offices for testing and training
2 new routers: one at the Gijón PAO and another at the Mieres node, interconnected with the current 7750

Nodes affected: Gijón · PAO · Mieres

PF-3 Spares

Supply of spare parts to maintain the equipment throughout the life of the contract

Variable part

PV-1 Up to 3,000 GPON ONTs

To migrate users whose ONT lacks sufficient capacity (e.g. the Alcatel I-221E-A, limited to 100 Mbps). Delivered node by node, at the time of its migration.

PV-2 Up to 4,000 GPON ONTs

To replace ONTs incompatible with the new equipment, per each node's migration schedule.

PV-3 Up to 100 XGS-PON ONTs

The first symmetric 10 Gbps terminals compatible with the new platform.

PV-4 Up to 5 new nodes

Network expansion into new coverage areas: number, sizing and location as needed.

PV-5 Capacity expansion

Growth of the equipment installed under the fixed part to absorb expansions of the renewed network.

PV-6 · PV-7 Licences and repairs

Usage licences if the solution requires them, and a repair/replacement service for faulty elements.

Execution

Three phases, sequential migration

Nothing is cut over until every conformity test passes, and every node has a rollback procedure to the previous situation.

Phase 1 · Initial installation and testing

WEEKS 1–12

Joint site survey, installation of the 2 routers (PAO Gijón and Mieres), a test node at GIT Oviedo, new element managers and OSS adaptation. Compatibility tests with the ONTs in service, conformity of the new GPON and XGS-PON ONTs and of the combined GPON/XGS-PON setup. Training for up to 15 people (min. 25 h). Passing every test is a prerequisite to continue.

Phase 2 · Rollout and migration of the 20 nodes

WEEKS 13–58 · 46 WEEKS

Installation of the new equipment node by node, starting with Muros de Nalón as the pilot and continuing with each area's lead node. GIT migrates the users; the contractor supplies the replacement GPON ONTs and spares. Duration per node depends on the ONTs in service:

≤ 512 ONT5 weeks · 3 installation + 2 migration

≤ 768 ONT7 weeks · 4 installation + 3 migration

≤ 1024 ONT8 weeks · 4 installation + 4 migration

Node-by-node migration schedule (initial planning · click a bar)

Muros de Nalón

s13–17

Luarca

s15–19

Navia

s17–21

Castropol

s19–23

Tapia de Casariego

s21–24

Tineo

s23–26

Cangas del Narcea

s25–29

Mieres *

s27–35

Pola de Lena

s30–37

Santa Eulalia de Morcín

s32–38

Moreda

s34–40

Cabañaquinta

s36–41

Felechosa

s38–42

Blimea

s40–47

Langreo *

s43–48

Arriondas

s45–49

Infiesto

s47–51

Nava

s48–52

Llanes

s51–57

Colombres

s54–58

Each bar spans from the site survey to the end of that node's user migration, per the pliego. Colours by geographic area.

Phase 3 · Contract follow-up

OVERLAPS PHASE 2 → END OF CONTRACT

Activation of the variable part: usage licences, fault repair and replacement service, up to 5 new nodes, capacity expansions, level-3 technical consultation and advice, and supply of additional GPON ONTs and XGS-PON ONTs.

⚠ TO-SCALE RECREATION — the room, the door and each cabinet's position are taken from the pliego's floor plan; the number of OLTs, their cards and their GPON ports, from the equipment tables; and what's silkscreened on each rack — manufacturer, model, code and card set — from those same sources. The finishes, the colours and the equipment's appearance remain interpretation no matter how much the render has improved: knowing an OLT is an Alcatel 7342 is not having a photo of an Alcatel 7342, and the pliego doesn't include one. This is not a photograph or a real model of the node.

simulation · not a real image

DRAG to look around · W A S D / arrow keys to move · WHEEL or PINCH to zoom

From the user's living room to the Gijón PAO