+1-800-346-6539 [email protected] Resources Blog

Molex Resources & Learning Center

Buyer guides, selection tools, installation tutorials, and technical documentation to help you make confident connector decisions.

Selection Tools

Interactive tools and comparison charts to narrow down your connector choices by specification.

Installation Tutorials

Visual, step-by-step instructions for connector installation, termination, and testing procedures.

Technical Documentation

Datasheets, application notes, white papers, and compliance certificates for all Molex products.

Common Questions

Insertion loss measures the signal power lost when light passes through a connector. For fiber optic connectors, typical values range from 0.10 dB to 0.30 dB. Even small differences compound across large networks — a 0.1 dB improvement per connection can extend reach by several kilometers or eliminate the need for additional amplification equipment.

Single-mode connectors (9/125 micron) are used for long-distance transmission beyond 500 meters, offering higher bandwidth and lower attenuation. Multi-mode connectors (50/125 or 62.5/125 micron) are ideal for short-range data center and campus connections up to 500 meters, with lower cost transceivers. Your choice depends on distance, bandwidth requirements, and budget.

VSWR (Voltage Standing Wave Ratio) measures impedance matching between an RF connector and the transmission line. A perfect match is 1:1. Values below 1.5:1 are considered good for most applications. Lower VSWR means less reflected power, better signal transmission efficiency, and reduced heat generation in high-power systems.

Technical Trade-offs Worth Understanding

Connector and cabling decisions involve real engineering trade-offs. Here are two common debates our customers navigate.

Fiber Optic vs. Copper for Last-Mile Connectivity

The choice between deploying fiber-to-the-premises and leveraging existing copper infrastructure with technologies like G.fast and VDSL2 remains a significant planning decision for network operators.

Case for Full Fiber:

Future-proof bandwidth capacity with symmetric gigabit speeds, lower long-term maintenance costs (no active electronics in the outside plant for PON), superior latency below 1 ms, and reliability advantages for next-generation applications including cloud gaming and remote surgery.

Case for Enhanced Copper / Hybrid:

Significantly lower upfront deployment cost by reusing existing copper pairs, faster rollout timelines (weeks vs. months for civil works), and sufficient bandwidth for current demand — G.fast delivers up to 1 Gbps over distances under 250 m, which covers many last-mile scenarios.

The right choice depends on projected bandwidth demand growth, existing infrastructure condition, regulatory incentives, and deployment timeline constraints. Many operators adopt a phased approach: G.fast for immediate coverage, fiber overbuild for high-demand areas.

Active Optical Networks (AON) vs. Passive Optical Networks (PON)

Selecting between AON and PON architectures involves balancing per-user bandwidth, operational costs, and deployment economics.

Case for AON:

Dedicated bandwidth per subscriber (no sharing), longer reach up to 80 km without amplification, easier per-port troubleshooting and traffic monitoring, and simpler capacity planning since each user has a dedicated wavelength or fiber.

Case for PON:

Lower operational costs with no powered equipment in the field (passive splitters only), simpler outside plant maintenance, better cost economics for high-density residential deployments (1:32 or 1:64 split ratios), and evolving standards like 25G-PON and 50G-PON narrowing the bandwidth gap.

Enterprise campus networks often favor AON for dedicated bandwidth guarantees, while residential FTTH deployments predominantly use GPON or XGS-PON for cost efficiency. Connector requirements differ: AON typically uses more SC/APC connections per subscriber, while PON requires high-quality splitter-grade connectors with insertion loss below 0.15 dB.

Still Have Questions?

Our application engineers love helping customers find the right solution. Reach out anytime.

Talk to an Expert