proximity. Check with the PBX manufacturer regarding connecting the PBX AC ground to telco/PTT ground.

NOTE: Connecting AC grounds and telco/PTT grounds of telephone equipment may violate rules of certain regulatory agencies. Check with your local telephone company and/or agency regarding regulations that deal with grounding.

Interface Conversions

Different telephony interfaces can be configured at the local and remote SmartSwitch 1800s. Through Voice System Configuration (page 13-3), each device is informed of the interface type used at the remote end. Signaling conversion is done in the multi- plexing software without the aid of any external equipment. The following combina- tions are supported:

E&M to E&M

E&M to OPX Loop Start

E&M to SLT Loop Start

OPX Loop Start to OPX Loop Start

OPX Loop Start to SLT Loop Start

Application Examples

In the following examples the term "attached device" refers to tie line equipment such as the SmartSwitch 1800.

E&M Type I

Idle Condition: The "E" lead is biased by the PBX at -48 Vdc. The "M" lead is biased at 0 Vdc by the attached device (SmartSwitch 1800).

PBX-Initiated Call: The PBX supplies -48 Vdc to the "M" lead, signaling to the attached device that it wants a connection. The attached device grounds the "E" lead, signaling the response.

Attached Device-Initiated Call: The attached device grounds the "E" lead, signaling to the PBX that it wants a connection. The PBX supplies -48 Vdc to the "M" lead, sig- naling the response.

PBX-Initiated Disconnect: The PBX initiates disconnection by opening the "M" lead. The "M" lead is pulled to 0 Vdc, as biased by the attached device. In response, the attached device opens the "E" lead, which is pulled to -48 Vdc, as biased by the PBX.

Attached Device Initiated Disconnect: The attached device initiates the disconnect by opening the "E" lead. The "E" lead is pulled to -48 Vdc as biased by the PBX. In response, the PBX opens the "M" lead, which is pulled to 0 Vdc, as biased by the attached device.

Voice Configuration Reference Information

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1800 specifications

Cabletron Systems, a leading player in network management and telecommunications solutions during the late 20th century, introduced several innovative products that played a crucial role in shaping enterprise networking. Among these were the Cabletron FRX6000, FRX4000, and the FRX1800, which delivered advanced features aimed at enhancing network performance, security, and scalability.

The Cabletron FRX6000 was designed as a robust multi-layer switch, ideal for large-scale enterprise environments. It supported extensive routing capabilities, allowing organizations to manage traffic efficiently even under heavy loads. The FRX6000 boasted high throughput rates and low latency, making it suitable for demanding applications. With support for various network protocols, including IP, IPX, and AppleTalk, its adaptability made it a versatile choice for diverse networking needs. Moreover, security features like VLAN support and Access Control Lists (ACLs) provided enhanced protection against potential threats.

Moving to the FRX4000, this model offered a balance between performance and cost-effectiveness. The FRX4000 maintained many of the essential features of its larger counterpart while catering to medium-sized enterprises. It provided Layer 3 routing and could handle multiple simultaneous connections, ensuring seamless communication across departments. The modular design allowed for easy upgrades, enabling businesses to expand their network infrastructure without significant overhauls. This made the FRX4000 an attractive option for organizations looking to optimize their network investments.

Lastly, the FRX1800, designed for small to medium businesses, focused on simplicity and ease of use while still incorporating powerful network management capabilities. Its user-friendly interface made it accessible for organizations lacking extensive IT resources. The FRX1800 provided essential functionalities such as Integrated Layer 2 switching and routing, network monitoring, and basic security features, ensuring that even smaller companies could maintain efficient, reliable networking without overwhelming complexity.

All three models utilized advanced technologies, including a high bandwidth backbone and state-of-the-art switching architecture, to enable fast and reliable data transfer. They also supported Quality of Service (QoS) mechanisms, allowing businesses to prioritize critical applications and ensure consistent performance across the network.

In summary, the Cabletron FRX6000, FRX4000, and FRX1800 were pivotal in enhancing network capabilities, providing organizations with scalable, secure, and high-performance options tailored to their specific needs.
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