# CT3/T3 12 Module Combination (12 Ports)

> Line module label | CT3/T3-F0
> I/O module label | CT3/T3 12 I/O
> Number of I/O ports | 12
> Software release | First supported: 3.2.0 Final supported: 14.0.x
> Description | 130 W Channelized and unchannelized T3
> Type | EFA ASIC
> Capability | DS3, DS1, DS0 HDLC framing
> Software features | See ERX Module Guide, Appendix A, Module Protocol Support 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 | BT43 SMB connector Cable that adapts to 75-ohm BNC is available. 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). See ERX Hardware Guide, Chapter 5, Cabling ERX Routers for more information.
> LEDs | See ERX Module Guide, Appendix B, Module LEDs.
> Alarms, errors, and events | See Monitoring Interfaces in JunosE Physical Layer Configuration Guide, Chapter 1, Configuring Channelized T3 Interfaces.