# SRP IOA

> Module label | SRP IOA
> IOA label | Not applicable
> Number of IOA ports | 3
> Software release | First supported: 7.0.1
> Description | 15 W maximum Pairs with SRP module Interfaces with the SRP modules through the system's midplane.
> Capability | Ethernet (IEEE 802.3) 10/100Base-T RS-232 Auxiliary port allows access to debug ports on a specific processor (SRP module, LM). External clock input accepts T1 or E1 signaling. You must configure the interface for T1 or E1. No additional configuration for a specific framing mode is required (for example, SF/ESF). The BNC connector has a 75–Ohm load impedance. T1 inputs must be converted from a balanced 100–Ohm signal to an unbalanced 75–Ohm signal by using a balun. The minimum signal amplitude at the BNC connector is 400mV peak.
> Software features | Not applicable
> Model compatibility | E320 router E120 router
> Line module compatibility | Not applicable
> SRP module compatibility | SRP-100 SRP-120 SRP-320
> Port redundancy support | Not applicable
> Cables and connectors | Terminal blocks Two dual-purpose BNC connectors (primary and secondary) for BITS timing clock sources (E1 or T1); 75–ohm E1 2.048–Mbps/T1 1.544–Mbps inputs terminating with a 120/75 ohm or 100/75 ohm balun One 10/100Base-T Ethernet management port with an RJ-45 connector Two RS-232 ports with DB-9 connectors for direct command line interface (CLI) and debug access See E120 and E320 Hardware Guide, Chapter 5, Cabling the Router for more information.
> LEDs | None
> Alarms, errors, and events | See Monitoring Modules in JunosE System Basics Configuration Guide, Chapter 6, Managing Modules.