# OC3/STM1-8 ATM IOA

> IOA label | ES2-S1 OC3-8 STM1 ATM IOA
> Number of IOA ports | 8
> Software release | First supported: 7.0.1
> Description | 50 W maximum Half-height module See Module and Slot Combinations for more information on combining IOAs in a slot. Uses a range of small form-factor pluggable (SFP) transceivers to support different modes and cable lengths.
> Capability | OC3/STM1 ATM
> Software features | See OCx/STMx ATM IOAs for information about the layer 2 and layer 3 protocols and applications that this module combination supports.
> Model compatibility | E320 router E120 router
> Line module compatibility | ES2 4G LM
> SRP module compatibility | SRP-100 SRP-120 SRP-320
> Line module redundancy compatibility | Can be paired with an ES2 4G LM. Must be installed in the same redundancy group as an ES2 4G LM and ES2–S1 REDUND IOA combination.
> Port redundancy support | Not applicable
> Cables and connectors (multimode) | Up to eight LC full duplex connectors Transmit power: min: –20 dBm max: –14 dBm Center wavelength: 1310 nm Receive input power: min: –30 dBm max: –14 dBm Rated for 2 km (1.2 miles) over 62.5-micron core cable with an optical loss of 0-9 dB or 50-micron core cable with an optical loss of 7 dB See E120 and E320 Hardware Guide, Chapter 5, Cabling the Router for more information.
> Cables and connectors (single-mode intermediate [IR-1]) | Up to eight LC full duplex connectors Transmit power: min: –15 dBm max: –8 dBm Center wavelength: 1310 nm Receive input power: min: –34 dBm max: –7 dBm Rated for 15 km (9.3 miles) of 9-micron core cable See E120 and E320 Hardware Guide, Chapter 5, Cabling the Router for more information.
> Cables and connectors (single-mode long reach [LR-1]) | Up to eight LC full duplex connectors Transmit power: min: –3 dBm max: 2 dBm Center wavelength: 1310 nm Receive input power: min: –28 dBm max: –7 dBm Rated for 40 km (24.9 miles) of 9-micron core cable See E120 and E320 Hardware Guide, Chapter 5, Cabling the Router for more information.
> LEDs | Board-level LEDs: OK (green)—Physical link is connected properly and is functioning properly FAIL (red)—Failure detected Port LEDs: ALM—Bi-color LED: Yellow: Local loss of signal exists Red: Remote loss of signal exists OK (green)—SONET is up and port is functioning properly. If not lit, a problem exists.
> Alarms, errors, and events | See Monitoring SONET/SDH Interfaces in JunosE Physical Layer Configuration Guide, Chapter 3, Configuring Unchannelized OCx/STMx Interfaces.