# GE I/O Modules Overview

ERX7xx models, ERX14xx models, and the ERX310 router all support the GE I/O module.

You can pair any of the following types of GE I/O modules with the GE/FE line module:

- The GE I/O SFP module uses a range of SFPs to support different optical modes and cabling distances. The I/O module accepts up to two pairs (Tx/Rx) of LC-style fiber-optic connectors that support different optical modes and cabling distances. Alternatively, the I/O module supports up to two pairs of copper SFPs.
- The GE I/O MULTI MODE module accepts up to two pairs (Tx/Rx) of SC-style fiber-optic connectors.
- The GE I/O SINGLE MODE module accepts up to two pairs (Tx/Rx) of SC-style fiber-optic connectors.

The GE I/O module has two ports: one port (port 0) is active (also known as primary), and the other port (port 0R) is redundant. If the active port fails, the redundant port automatically becomes active.

You can configure only port 0 for a Gigabit Ethernet interface; you cannot configure redundant port 0R. Cabling both ports provides a redundant path to the Gigabit Ethernet interface.

#### Related Documentation

- Ethernet Features Overview
- Ethernet Interface Platform Considerations
- Configuring Ethernet Interfaces
- GE-2 SFP I/O Modules Overview
- GE-8 I/O Modules Overview
- OC3-2 GE APS I/O Modules Overview
- ES2-S1 GE-4 IOAs Overview
- ES2-S1 GE-8 IOAs Overview
- ES2-S3 GE-20 IOAs Overview