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Release Date: 2025-11-06　　View Count:

FTTH Procurement Plan & Network Structure — Shenzhou Cables

Practical guidelines for sourcing, building, and accepting a high‑reliability FTTH network (GPON/XGS‑PON)

Executive Overview

This document describes a complete procurement strategy and a reference FTTH (Fiber‑to‑the‑Home) network structure for residential and mixed‑use deployments. It covers the end‑to‑end architecture (central office to ONT), bill of materials, vendor qualifications, quality control, logistics, acceptance testing, and risk management. Specifications reflect Shenzhou Cables’ manufacturing capabilities and field‑proven best practices used by global service providers.

Part I — FTTH Network Structure

1. Reference Architecture

• Core/Backbone → Central Office (CO) with OLT shelves
• Feeder Network → ODF/patch panels, fiber management, and protected feeder cables to Fiber Distribution Hubs (FDH)
• Distribution Network → Passive splitters (1:8–1:64) in FDH or street cabinets, distribution cables to access points
• Drop Network → Outdoor/indoor drop cables to Customer Premise Equipment (ONT), via Customer Terminal Boxes (CTO/CPE box)
• Customer Premise → ONT/ONU, Wi‑Fi router, power supply, and optional battery backup

2. PON Technology Options

• GPON (ITU‑T G.984): 2.5 Gb/s DS / 1.25 Gb/s US; typical split 1:32–1:64
• XGS‑PON (ITU‑T G.9807.1): 10 Gb/s DS / 10 Gb/s US; typical split 1:32–1:64
• Optical budget classes: B+, C+, N1/N2; final selection based on outside‑plant lengths, splices, and connector counts

3. Optical Design Principles

• Keep feeder routes as straight as possible; minimize splice points and bend events
• Engineer for ≥3–6 dB design margin beyond calculated losses
• Respect minimum bend radii (e.g., G.657.A1/A2 for tight indoor routing)
• Reserve spare fibers and splitter capacity (~20–30%) for growth and restoration
• Standardize on SC/APC for PON to reduce back‑reflection

4. Typical Segment Specifications

Feeder Cables (OSP):
• Single‑mode G.652.D or G.657.A1 loose‑tube, ADSS or duct‑grade
• Sheath: PE (UV‑resistant), dielectric strength members; optional AT sheath for anti‑tracking in HV corridors
Distribution Cables:
• 12–144F loose‑tube or micro‑cables, LSZH for indoor transition
Drop Cables:
• 1–4F flat or round, bend‑insensitive G.657.A2; outdoor LSZH/PE sheath; indoor LSZH
Splitters:
• 1:8/1:16/1:32/1:64 PLC, G.657.A1 pigtails, connectorized SC/APC or bare‑fiber in trays
Passive Hardware:
• FDH cabinets (IP54+), closures (dome or in‑line), splice trays, fiber management, distribution boxes, CTOs

Part II — Procurement Plan

5. Scope & Work Packages

WP1 Materials (Cables & Passive Hardware), WP2 Actives (OLT/ONT), WP3 Tools & Test Equipment, WP4 Logistics & Packaging, WP5 Documentation & Training. Each WP includes delivery milestones, QA/QC gates, and acceptance criteria.

6. Master Bill of Materials (BOM)

The following table lists core line items. Quantities are estimated using the formulas provided in Section 14.

No.	Category	Item / Description	Key Specs	Unit	Est. Qty (Formula)	Notes
1	Feeder Cable	ADSS/OSP Loose‑tube SM G.652.D/G.657.A1	24–144F; PE sheath; dielectric; rated tensile ≥2–6 kN	km	Feeder route length × (1.02–1.05)	Add 2–5% waste
2	Distribution Cable	12–96F OSP/indoor‑outdoor cable	LSZH (indoor), PE (outdoor); bend radius ≥10×OD	km	Distribution routes × (1.03)	Spare 10–20% fibers
3	Drop Cable	1–4F G.657.A2 drop (flat/round)	Outdoor PE/LSZH indoor; SC/APC pigtail	km	Avg. drop length × HH × (1.05)	HH = homes passed/connected
4	Micro‑duct / HDPE Duct	HDPE silicon 40/33 mm + accessories	Pressure‑rated; UV‑resistant; colored stripes	km	Civil routes × (1.02)	Couplers/bends included
5	FDH Cabinet	Outdoor splitter cabinet	IP54+; 144–576F capacity; lockable	pcs	By area take‑rate	Room for growth 20–30%
6	Splitters	PLC 1:8 / 1:16 / 1:32 / 1:64	≤0.2 dB uniformity; ≤0.3 dB PD loss variance	pcs	Ports per FDH × split plan	SC/APC or bare
7	Closures	Dome / In‑line fiber joint closures	IP68; 24–144F; heat‑shrink or mechanical	pcs	Splice points × (1.1)	Include trays
8	Boxes	Wall‑mount distribution/CTO boxes	4–16 ports; SC/APC; LSZH	pcs	Access points	Room for expansion
9	ODF/Panels	19" ODF, patch panels, MPO/LC patching	LC/SC adapters; cable mgmt	pcs	CO & hub counts	Include pigtails & cords
10	Connectors & Pigtails	SC/APC, LC/UPC cords	≤0.2 dB insertion; ≥55 dB return (APC)	pcs	Per ONT + spares 5–10%	Field/Factory
11	Hardware	Stainless strap, band‑it buckles, clamps	304/316 S/S	set	Per pole/closure	Corrosion‑resistant
12	Tools	Fusion splicer, cleaver, OTDR, power meter	Core alignment; 1310/1550 nm	set	Per crew	Calibration certs
13	Consumables	Splice sleeves, alcohol wipes, tags	Spec‑grade	lot	Per 100 splices	Add buffer 10%

7. Vendor Qualification Criteria

1) ISO 9001/14001/45001 or equivalent; RoHS/REACH compliance for materials.

2) Conformity to ITU‑T G.652.D/G.657.A1/A2, IEC 60794, IEC 61753/61754, GR‑326/GR‑1209/GR‑1221 where applicable.

3) Traceable test reports (factory OTDR, insertion/return loss, environmental tests).

4) Proven projects in similar climates (UV, high humidity, coastal salt‑spray).

5) Lead‑time commitments, safety stock options, and RMA policy ≤1% DOA.

6) Export‑ready packing; drum handling specs; barcoding for WMS integration.

8. Quality Assurance (QA/QC)

Factory: type/routine/sample tests per IEC/GR; incoming inspection (AQL); dimensional checks; fiber ID verification.
Site: closure sealing, splice loss ≤0.1–0.2 dB, connector IL ≤0.3 dB (SC/APC), ORL ≥55 dB, OTDR 1310/1550 nm, end‑to‑end power, PON service activation tests.

9. Logistics & Packaging

• Incoterms EXW/FOB/CIF/DDP as negotiated
• Fumigated reels/crates, moisture barrier, impact indicators
• Labels: project code, drum no., fiber count/length, G/N weight, handling symbols
• Staggered deliveries by build zone to minimize yard congestion

10. Documentation Deliverables

• Datasheets & MSDS; FAT reports; OTDR/IL/ORL records; closure maps; as‑built drawings (GIS/KML)
• Handover: optical budget, test certificates, warranty, spares list

11. Acceptance Test Plan (ATP)

Test	Method	Acceptance Criteria
OTDR (1310/1550 nm)	Bi‑directional trace per span	Match design; no unexplained events; within budget
Insertion/Return Loss	OLTS / LS & PM	IL ≤0.3 dB per connector; ORL ≥55 dB (APC)
Splice Loss	OTDR/events	≤0.1–0.2 dB per splice
Continuity/Polarity	VFL & mapping	Correct mapping; no cross
Service Test	IP throughput/latency/jitter	Per SLA (e.g., 1 Gbps DS, <5 ms access)

12. Risk Register (Sample)

Risk	Impact	Mitigation
Permit delays	Schedule slip	Early authority engagement; parallelize materials prep
Supply lead‑time	Build idle time	Dual‑source critical items; buffer stock
ROW conflicts	Re‑routing	Alternate routes pre‑approved; HDD/micro‑trenching
Weather	Productivity loss	Seasonal scheduling; heat/rain plans
Fiber damage	Rework cost	Training; protective sheathing; clear tagging

13. Payment & Schedule (Template)

• Payment: 30% advance at PO; 60% against shipment docs; 10% after site acceptance (or LC at sight)
• Schedule: T0 PO; T0+2w FAT; T0+4–6w first shipment; weekly deliveries; completion T0+16–24w

14. Quantity Estimation Cheat Sheet

Feeder = Σ(feeder routes) × (1.02–1.05)
Distribution = Σ(distribution routes) × 1.03
Drop = Avg. drop length × Homes connected × 1.05
Splitters = Homes served ÷ Users per PON port × design reserve
Closures = Splice points × 1.1
Ducts = Civil length × 1.02 + fittings

15. Optical Budget (Worked Example)

Assume XGS‑PON N2 (budget ~31–33 dB). Example path adds: fiber attenuation, splitter loss, splices, connectors, and margin. Reduce split, shorten route, or raise optics class if the total loss exceeds the budget.

16. Shenzhou Cables — Supply Portfolio (Excerpt)

• ADSS & duct‑grade OSP (SM G.652.D/G.657.A1/A2)
• HDPE silicon ducts (e.g., 40/33 mm) & fittings
• PLC splitters, FDH cabinets, closures, CTO/distribution boxes
• Patch cords & pigtails (SC/APC, LC/UPC), ODF/patch panels (incl. MPO)
• Accessories: stainless straps & band‑it buckles, clamps
• Tools & test kits: fusion splicer, cleaver, OTDR, OLTS, microscope

Contact: chulinxie@shenzhou-cables.cn | https://shenzhou-cables.cn | +86 15818462024

Figure 1. End‑to‑end FTTH topology (OLT → FDH/splitter → ONT).

Figure 2. HDPE silicon duct 40/33 mm cross‑section (schematic).

Figure 3. ADSS cable layered structure (schematic).

Figure 4. FDH cabinet front‑panel port map (illustrative).

Figure 5. Fiber joint closure with stacked splice trays (illustrative).

For product drawings & datasheets: contact Shenzhou Cables — chulinxie@shenzhou-cables.cn

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