# Supported Features

This section describes ATM feature support on E Series modules.

For more information about the physical layer characteristics of the modules described in this section, including the numbering schemes, see the JunosE Physical Layer Configuration Guide.

## Module Capabilities

The level of support for certain ATM capabilities varies depending on the module. Table 5 lists the specific differences in the capabilities of the modules.

The number of VP tunnels varies with the number of ports in the associated line module. For information about the maximum number of ATM VP tunnels supported per port for all line modules, see JunosE Release Notes, Appendix A, System Maximums.

| Note: Support for the OC3 (dual port) line module has been deprecated.

Table 5: ATM Capabilities on Line Modules and I/O Modules

Line Module | I/O Module or IOA | Number of VP Tunnels | VPI/VCI Address Range | Configurable Bit Range | Number of VCs on Each Port | ATM Circuit Traffic Management Types | VP Tunnel Traffic Management Types
--- | --- | --- | --- | --- | --- | --- | ---
OCx/STMx ATM | OC3-4 I/O 4xDS3 ATM I/O | 1024 | Configurable | 20 | 8000 active 16,000 configured | CBR, UBR, UBR with PCR, VBR-NRT, VBR-RT | CBR, VBR-NRT
OCx/STMx ATM | OC12/STM4 I/O | 256 | Configurable | 20 | 8000 active 16,000 configured | CBR, UBR, UBR with PCR, VBR-NRT, VBR-RT | CBR, VBR-NRT
OC3/STM1 GE/FE | OC3-2 GE APS I/O | 1024 | Configurable | 20 | 8000 active 16,000 configured | CBR, UBR, UBR with PCR, VBR-NRT, VBR-RT | CBR, VBR-NRT
ES2 4G LM | ES2-S1 OC3-8 STM1 ATM IOA | 1 IOA per slot: 2048 2 IOAs per slot: 4096 | Fixed VPI: 0–255 VCI: 0–65535 | – | 8000 active 16,000 configured | CBR, UBR, UBR with PCR, VBR-NRT, VBR-RT | CBR, VBR-NRT
ES2 4G LM | ES2-S1 OC12-2 STM4 ATM IOA | 1 IOA per slot: 512 2 IOAs per slot: 1024 | Fixed VPI: 0–255 VCI: 0–65535 | – | 8000 active 16,000 configured | CBR, UBR, UBR with PCR, VBR-NRT, VBR-RT | CBR, VBR-NRT

## Virtual Channel Support

The number of virtual channels (VCs) that the router supports on each port varies depending on the E Series router and module you are using. For information about the maximum number of ATM VCs supported per chassis, per module, and per port, see JunosE Release Notes, Appendix A, System Maximums.