Network Knowledge Base

Glossary

Common optical networking, switching, cabling, and protocol terms for product comparison and solution planning.

Terms

18 terms

400G

Optical Modules

A high-speed Ethernet rate used in data center spine-leaf networks and optical interconnects.

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AOC

Optical Modules

Active Optical Cable. A pre-terminated optical cable assembly with embedded transceivers for short-reach high-speed links.

BGP

Protocols

Border Gateway Protocol. A routing protocol often used in large data centers, internet edge, and EVPN-VXLAN fabrics.

DAC

Optical Modules

Direct Attach Copper. A passive or active copper cable assembly used for short-distance switch-to-switch or switch-to-server links.

DOM

Operations

Digital Optical Monitoring. Real-time diagnostics for optical power, temperature, voltage, and bias current.

EVPN-VXLAN

Protocols

An overlay architecture combining EVPN control plane with VXLAN encapsulation for scalable Layer 2 and Layer 3 fabrics.

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Insertion Loss

Fiber Cabling

The signal loss introduced by a connector, splice, cable, or component in a fiber link.

LC Connector

Fiber Cabling

A compact fiber connector commonly used for SFP, SFP+, SFP28, and many high-density patching systems.

MLAG

Switching

Multi-chassis link aggregation. A design that lets two switches appear as one logical aggregation endpoint.

MPO/MTP

Fiber Cabling

Multi-fiber push-on connector family used in high-density trunk cabling and parallel optics.

OS2

Fiber Cabling

Single-mode optical fiber type used for longer reach links, often with 1310 nm or 1550 nm optics.

PoE

Switching

Power over Ethernet. Technology that carries power and data over Ethernet cabling for devices such as APs and cameras.

QSFP28

Optical Modules

A compact 100G optical transceiver form factor based on four 25G electrical lanes.

RDMA

Protocols

Remote Direct Memory Access. A low-latency data transfer method used in storage, HPC, and AI cluster networks.

RoCE

Protocols

RDMA over Converged Ethernet. Enables RDMA traffic over Ethernet fabrics for high-performance workloads.

SFP+

Optical Modules

A 10G small form-factor pluggable transceiver widely used for access, aggregation, and server links.

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Spine-Leaf

Switching

A two-tier data center topology that improves east-west bandwidth and predictable latency.

WDM

Optical Modules

Wavelength Division Multiplexing. A technique that carries multiple optical channels over one fiber pair or strand.