> For the complete documentation index, see [llms.txt](https://docs.glesys.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.glesys.com/products/connectivity/network-services/wavelength/service-description.md).

# Service description

Version 2024.01.01

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An Active Layer 1 Wavelength service with gray light client hand-off is built on our [Spectrum](/products/connectivity/network-services/spectrum.md) service. The service enables us to monitor it and create custom paths by linking multiple segments.

### Hand-off interface

<table data-header-hidden><thead><tr><th width="374"></th><th></th></tr></thead><tbody><tr><td><strong>10GBASE-LR</strong></td><td>SFP+, 10Gbps, 1310nm, SM, 10km</td></tr><tr><td><strong>100GBASE-LR4</strong></td><td>QSFP28, 100Gbps, 1310nm, SM, 10km</td></tr></tbody></table>