# ES2-S3 GE-20 IOAs Overview

The E120 and E320 routers support the ES2-S3 GE-20 IOA. Other E Series routers do not support the ES2-S3 GE-20 IOA.

The ES2-S3 GE-20 IOA pairs with the ES2 10G LM or the ES2 10G ADV LM to provide Gigabit Ethernet operation through 20 line interfaces.

The ES2-S3 GE-20 IOA is offered in a full-height size that uses both adapter bays. The IOA is identified by the software as adapter bay 0. For more information about installing IOAs, see the E120 and E320 Hardware Guide.

The IOA can use either fiber-optic or copper SFPs. The IOA accepts up to four pairs (Tx/Rx) of LC-style fiber-optic connectors that support different optical modes and cabling distances.

The ES2-S3 GE-20 IOA does not support port redundancy.

## ES2 10G LM Combination

With a 100 Gbps fabric configuration, the E320 router can accommodate up to 2 combinations of ES2 10G LMs and ES2-S3 GE-20 IOAs. You must install a combination in either of the turbo slots (slot 2 or slot 4). The 100 Gbps allocates 10 Gbps of overall bandwidth to each of these slots.

With a 120 Gbps fabric configuration, the E120 router can accommodate up to 6 combinations of ES2 10G LMs and ES2-S3 GE-20 IOAs. You can install a combination in any of the line module slots, each of which is allocated 10 Gbps of overall bandwidth.

With a 320 Gbps fabric configuration, the E320 router can accommodate up to 12 combinations of ES2 10G LMs and ES2-S3 GE-20 IOAs. You can install a combination in any of the line module slots, each of which is allocated 10 Gbps of overall bandwidth.

### Bandwidth and Line Rate Considerations

Table 23 lists the average data rate on the ES2-S3 GE-20 IOA when installed in E120 and E320 routers with one ES2 10G LM installed.

Table 23: Average Data Rate for One ES2-S3 GE-20 IOA Installed with an ES2 10G LM

Port Combination | 100 Gbps, 120 Gbps, or 320 Gbps Configuration Average Data Rate per GE-20 IOA (> 128 Byte Packets)
--- | ---
Any 10 ports | 1 Gbps per port
All 20 ports | 500 Mbps per port

### Managing High-Density Ethernet

When installed in an E120 or E320 router with any SRP module combination, the overall data rate for the ES2 10G LM with one ES2-S3 GE-20 IOA is limited to 10 Gbps. The line module can become oversubscribed because of the IOA available wire rate (20 Gbps).

Currently, flow control using MAC pause frames is disabled on the ES2-S3 GE-20 IOA. The IOA does not transmit or receive pause frames.

For more information about high-density Ethernet on E Series routers, see High-Density Ethernet Overview.

## ES2 10G ADV LM Combination

With a 100 Gbps fabric configuration, the E320 router can accommodate up to 2 combinations of ES2 10G ADV LMs and ES2-S3 GE-20 IOAs. You must install a combination in either of the turbo slots (slot 2 or slot 4). The 100 Gbps allocates 10 Gbps of overall bandwidth to each of these slots.

With a 120 Gbps fabric configuration, the E120 router can accommodate up to 6 combinations of ES2 10G ADV LMs and ES2-S3 GE-20 IOAs. You can install a combination in any of the line module slots, each of which is allocated 10 Gbps of overall bandwidth.

With a 320 Gbps fabric configuration, the E320 router can accommodate up to 12 combinations of ES2 ADV LMs and ES2-S3 GE-20 IOAs. You can install a combination in any of the line module slots, each of which is allocated 10 Gbps of overall bandwidth.

### Bandwidth and Line Rate Considerations

Table 24 lists the average data rate on the ES2-S3 GE-20 IOA when installed in E120 and E320 routers with one ES2 10G ADV LM installed.

Table 24: Average Data Rate for One ES2-S3 GE-20 IOA Installed with an ES2 10G ADV LM

Port Combination | 100 Gbps, 120 Gbps, or 320 Gbps Configuration Average Data Rate per GE-20 IOA (> 128 Byte Packets)
--- | ---
Any 10 ports | 1 Gbps per port
All 20 ports | 500 Mbps per port

### Managing High-Density Ethernet

When installed in an E120 or E320 router with any SRP module combination, the overall data rate for the ES2 10G ADV LM with one ES2-S3 GE-20 IOA is limited to 10 Gbps. The line module can become oversubscribed because of the IOA available wire rate (20 Gbps).

Currently, flow control using MAC pause frames is disabled on the ES2-S3 GE-20 IOA. The IOA does not transmit or receive pause frames.

For more information about high-density Ethernet on E Series routers, see High-Density Ethernet Overview.

#### Related Documentation

- Gigabit Ethernet I/O Modules and IOAs Overview
- GE I/O Modules Overview
- 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