Interference Considerations

Chapter 2 Planning Your Installation

T1/E1-PBX Digital Voice Port Maximum Distances

Table 2-5shows the maximum distances between the digital voice port of a Cisco IAD and a digital PBX.

Table 2-5	Digital Voice Port Speed and Distance Limitations

Signal Rate	Distance (Feet)	Distance (Meters)

T1/E1 (CSU)	3000	915

FXS Analog Voice Port Maximum Distance

The maximum distance for a Foreign Exchange System (FXS) is established by a total allowable loop resistance, including off-hook phone or terminal equipment, of 600 ohm. The maximum distance is 100 meters away from the system as a limitation of Ethernet.

FXO Analog Voice Port Maximum Distance

The maximum distance is determined by the distance between the PBX or other equipment that provides battery and the connection to the FXO voice port.

When you run cables for any significant distance in an electromagnetic field, interference can occur between the electromagnetic field and the signals on the cables. This has two implications for installating terminal plant cabling:

•Unshielded plant cabling can emit radio interference.

•Strong electromagnetic interference (EMI), especially that caused by lightning or radio transmitters, can destroy the EIA/TIA-232 drivers and receivers in the Cisco IAD.

If you use twisted-pair cables with a good distribution of grounding conductors in your plant cabling, emitted radio interference is unlikely.

If you have cables that exceed the recommended distances, or if you have cables that pass between buildings, give special consideration to the effect of lightning strikes or ground loops. If your site has these characteristics, consult experts in lightning suppression and shielding. The electromagnetic pulse caused by lightning or other high-energy phenomena can easily couple enough energy into unshielded conductors to destroy electronic devices.

Without pulse meters and other special equipment, most data centers cannot resolve the infrequent but potentially catastrophic problems just described. Take precautions to avoid these problems by providing a properly grounded and shielded environment and by installing electrical surge suppression.

If you remove any module, you must either install a module in its place or install a cover plate over the opening. All module openings must be either occupied or covered to prevent electromagnetic interference.

For advice on the prevention of electromagnetic interference, consult experts in radio frequency interference (RFI).

Cisco IAD2430 Series Integrated Access Devices Hardware Installation Guide

2-6	OL-4234-06

IAD2430 specifications

Cisco Systems IAD2430 is a versatile Integrated Access Device (IAD) designed to deliver voice and data services to small and medium-sized businesses. This device plays a pivotal role in the convergence of voice and data networks, offering a comprehensive solution that simplifies management and enhances operational efficiency.

One of the most compelling features of the IAD2430 is its support for both traditional TDM (Time-Division Multiplexing) and VoIP (Voice over Internet Protocol) technologies. This dual capability enables businesses to migrate to IP-based voice solutions while still maintaining their existing TDM infrastructure. The IAD2430 is equipped with multiple built-in voice ports, allowing it to support a variety of telephony applications.

In terms of performance, the IAD2430 offers robust Quality of Service (QoS) features that prioritize voice traffic to maintain call clarity and reliability. This is particularly critical in environments where voice communication is essential for daily operations. QoS mechanisms ensure that voice packets are transmitted with minimal latency, jitter, and packet loss, providing an uninterrupted communication experience.

The IAD2430 also boasts advanced security features, including firewall protection and encrypted data transmission. This is particularly important for businesses looking to protect sensitive information and ensure compliance with industry regulations. The built-in security measures help safeguard against unauthorized access and potential threats, providing peace of mind to users.

Moreover, the device supports various WAN connections, including T1, DSL, and Ethernet, making it adaptable to different network environments. Its flexible connectivity options allow for seamless integration with existing network infrastructure while maximizing bandwidth utilization.

Management and configuration of the IAD2430 are simplified through a user-friendly web interface and support for remote administration. This allows IT staff to efficiently configure and monitor the device without the need for onsite visits, thus reducing operational costs.

In summary, the Cisco Systems IAD2430 stands out as a reliable and feature-rich IAD capable of catering to the needs of businesses that require integrated voice and data services. Its combination of TDM and VoIP support, enhanced QoS, robust security features, and flexible connectivity options make it an ideal choice for organizations looking to streamline their communication solutions.