# Modular computer network switch

> electrical network switch which can use field-replaceable units

**Wikidata**: [Q65083501](https://www.wikidata.org/wiki/Q65083501)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Modular_switch)  
**Source**: https://4ort.xyz/entity/modular-computer-network-switch

## Summary
A modular computer network switch is an electrical network switch designed to utilize field-replaceable units (FRUs). This allows users to upgrade, replace, or add components like ports, power supplies, or fans without replacing the entire chassis, enhancing flexibility and serviceability.

## Key Facts
- **Classification**: A subclass of network switch.
- **Core Function**: Uses packet switching to forward data within computer networks.
- **Key Design Feature**: Employs field-replaceable units (FRUs) for modularity.
- **Wikipedia Title**: "Modular switch".
- **Wikipedia Language**: English only.
- **Sitelink Count**: 1 (referring to the English Wikipedia article).
- **Wikidata Description**: Defined as "electrical network switch which can use field-replaceable units".
- **Google Knowledge Graph ID**: `/g/11h0g_lhkv`.

## FAQs
### Q: What is the main advantage of a modular switch over a fixed configuration switch?
A: The primary advantage is modularity; you can add, remove, or upgrade specific components like ports, power supplies, or fans individually as needed, without replacing the entire switch chassis, offering greater flexibility and scalability.

### Q: What are the common field-replaceable units (FRUs) in a modular switch?
A: Common FRUs include individual line cards (providing ports), supervisor/engine modules (managing switching logic), power supply units, cooling fans, and sometimes management modules.

### Q: How does modularity benefit network maintenance?
A: Modularity allows for faster repairs and upgrades. If a specific component fails or needs an upgrade (e.g., adding more ports), only the faulty or outdated FRU needs to be replaced, minimizing network downtime and simplifying inventory management.

### Q: Are all network switches modular?
A: No. While modular switches use FRUs, many network switches have fixed configurations where the number and type of ports are determined at the time of manufacture and cannot be changed after purchase.

## Why It Matters
Modular computer network switches are significant because they address the dynamic needs of modern networking environments. Their ability to scale incrementally by adding FRUs allows organizations to adapt their network infrastructure precisely to current demands without over-provisioning or costly full replacements. This modularity drastically improves network availability and reduces total cost of ownership by enabling rapid component replacement, upgrades, and troubleshooting. It forms a critical backbone for scalable and resilient enterprise networks, data centers, and service provider infrastructures where flexibility and uptime are paramount.

## Notable For
- **Field-Replaceable Units (FRUs)**: Designed specifically to allow individual components to be swapped in the field without replacing the entire switch.
- **Chassis-Based Architecture**: Typically features a central chassis where various line cards and modules are installed, contrasting with fixed-port designs.
- **Scalability**: Enables network capacity expansion (e.g., adding more ports or processing power) by simply installing additional FRUs.
- **Reduced Downtime**: Facilitates quick hardware maintenance, upgrades, and repairs by targeting only the specific faulty or outdated module.

## Body
### Definition
A modular computer network switch is a specific type of network switch characterized by its use of field-replaceable units (FRUs). This means critical components are designed to be easily removable and replaceable in the field by a technician.

### Characteristics
- **Core Function**: Functions like any other network switch, utilizing packet switching to forward data packets between connected devices on a network.
- **Modularity Principle**: The defining feature is its modular architecture, built around a central chassis into which various modules (FRUs) can be inserted.
- **Common FRUs**: Typically include:
  - Line Cards (Interface Modules): Providing specific port types (e.g., Gigabit Ethernet, 10 Gigabit Ethernet, fiber).
  - Supervisor/Engine Modules: Controlling the switching logic, routing tables, and management functions.
  - Power Supply Units (PSUs): Providing power to the chassis and modules.
  - Cooling Fans: Managing heat dissipation.
  - Management Modules (optional): Dedicated processors for specific management tasks.

### Relationship
- **Parent Class**: It is a subclass of the broader network switch category, which is a fundamental component of computer networks and internet infrastructure.