# T3 ATM Module Combination (4 Ports)

> Line module label | OCx/STMx ATM or OCx/STMx /DS3-ATM
> I/O module label | 4xDS3 ATM I/O
> Number of I/O ports | 4
> Software release | First supported: 4.1.0 (128 MB), 5.0.0 (256 MB) Final supported: Not applicable
> 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 T3 for ATM
> Type | EFA ASIC
> Capability | ATM/AAL5
> Software features | See Unchannelized T3 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
> Cables and connectors | 75-ohm connector The line interface unit supports two line buildouts: 0–68.5 m (0–225 feet) 69–137 m (226–450 feet) Signal strength is software controlled. The transmitted signal complies with ANSI T1.102-1993 Digital Hierarchy - Electrical Interfaces (1999) for cable lengths up to 201 m (660 feet).
> LEDs | See Module LEDs.
> Alarms, errors, and events | See Monitoring Interfaces in JunosE Physical Layer Configuration Guide, Chapter 2, Configuring T3 and E3 Interfaces.