# OC3/STM1 ATM Single-Mode Intermediate Reach With APS/MSP Redundancy Module Combination

> Line module label | OCx/STMx ATM or OCx/STMx /DS3-ATM
> I/O module label | 4XOC3 APS I/O SINGLE MODE
> Number of I/O ports | 4 active, 4 redundant
> Software release | First supported: 5.1.2, 5.2.0 (APS/MSP) Final supported: Not applicable The OCx/STMx ATM line module or the OCx/STMx /DS3-ATM line module must have a minimum of 256 MB of memory to be used with JunosE Release 5.3.0 or a higher-numbered release.
> Description | 130 W Can use either the 128-MB OCx/STMx ATM line module or the 256-MB OCx/STMx /DS3-ATM line module. Unchannelized, concatenated OC3/STM1 for ATM
> Type | EFA ASIC
> Capability | OC3/STM-1 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 | LC 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.