# OC3/STM1 ATM Single-Mode Intermediate Reach Without APS/MSP Redundancy Module Combination (256-MB Memory)

> Line module label | OCx/STMx ATM or OCx/STMx /DS3-ATM
> I/O module label | OC3-4 I/O SINGLE MODE
> Number of I/O ports | 4
> Software release | First supported: 5.0.0, 5.3.0 or a higher-numbered release Final supported: Not applicable
> Description | 130 W 256 MB of memory The 128-MB version has reached end-of-life. Unchannelized, concatenated OC3/STM1 for ATM
> Type | EFA ASIC
> Capability | OC3/STM1 ATM/AAL5
> Software features | See OCx/STMx ATM Modules for information about the layer 2 and layer 3 protocols and applications that this module combination supports.
> Model compatibility | ERX7xx models ERX14xx models ERX310 router
> SRP module compatibility | SRP-5G+ SRP-10G SRP-40G SRP-40G PLUS SRP-SE10G
> Module redundancy support | 1:N redundancy NOTE: Line module redundancy is not supported on the ERX310 router.
> Cables and connectors | SC full duplex Tx power: min: –15 dBm max: –8 dBm Center wavelength: 1310 nm Rx input power: min: –31 dBm max: –8 dBm Rated for 15 km (9.3 miles) of 9-micron core cable See ERX Hardware Guide, Chapter 5, Cabling ERX Routers for more information.
> LEDs | See Module LEDs.
> Alarms, errors, and events | See Monitoring SONET/SDH Interfaces in JunosE Physical Layer Configuration Guide, Chapter 3, Configuring Unchannelized OCx/STMx Interfaces.