[Yandex Cloud documentation](../../index.md) > [Yandex Cloud Interconnect](../index.md) > [Concepts](index.md) > Transceivers

# Transceivers

Optical modules, or transceivers, are used to connect your equipment or telecom provider equipment to Yandex Cloud equipment. To set up a connection, you need to select a **transceiver type** from the table below.

When you order Cloud Interconnect, Yandex Cloud reserves a port with the transceiver type you selected on the Yandex Cloud equipment.

Your equipment or telecom provider equipment must have a transceiver compatible with that on the Yandex Cloud equipment. It is you or your telecom provider that has to purchase this transceiver on their own. 

See the table below for a list of optical transceivers that work with Yandex Cloud equipment.

| Type of transceiver | Ethernet | Bandwidth<br/> | Maximum<br/>distance | Average wavelength<br/>per channel |
| ----- | ----- | ----- | ----- | ----- |
| 1000BASE‑LX10 | IEEE 802.3ah | 1 Gbps | 10 km | 1310 nm |
| 10GBASE-LR | IEEE 802.3ae | 10 Gbps | 10 km | 1310 nm |
| 10GBASE-ER | IEEE 802.3ae | 10 Gbps | 40 km | 1550 nm |
| 100GBASE-LR4 | IEEE 802.3ba | 100 Gbps | 10 km | 1295.56 nm<br/>1300.05 nm<br/>1304.59 nm<br/>1309.14 nm |
| 100GBASE-ER4 | IEEE 802.3ba | 100 Gbps | 40 km | 1295.56 nm<br/>1300.05 nm<br/>1304.59 nm<br/>1309.14 nm |

All transceivers have Duplex LC connectors with UPC polish. 

For each optical cross-connect, you can only use single-mode (SM) optical fibers.

{% note alert %}

* Other types of transceivers that are not listed in the above table are **not supported**. 
* There is **no support** for optical single-fiber transceivers.
* Copper transceivers using twisted pair, such as UTP5 and UTP6, are **not supported**.
* Multi-mode (MM) optical fibers **are not allowed**.

{% endnote %}