Power Failure Operation. During a power failure, MLS and MLC-model phones will not work because they require power to operate. However, if standard phones are connected to extension jacks 10, 16, 22, or 28, they can place and answer calls on lines at line jacks 01, 07, 13, or 19, respectively. Connect a standard phone to one or more of these extensions, either alone or combined with an MLS- or MLC-model phone. (If you combine a standard phone and an MLS- or MLC-model phone on one extension, you may want to turn off the standard phone’s ringer during normal use.)

Primary

 

 

 

 

 

 

Expansion

Carrier

 

 

 

Primary

 

 

Carrier

 

 

 

 

Processor

 

 

 

 

 

 

 

Module

 

 

 

 

 

 

 

 

 

 

Line

 

 

 

 

Expansion

 

 

Jacks

 

 

 

 

 

 

 

 

 

 

 

Processor

 

 

 

Extension

 

 

 

Module

 

 

 

Jacks

 

 

 

 

 

 

 

206

4 0 0

2 0 6

4 0 0

206

4 0 0

2 0 6

400

Figure 2-1. Line and Extension Numbering at the Equipment Controller

Connection of Telephones and Devices

You can connect the following telephones and devices to the equipment controller:

■MLS- and MLC-Model Phones. MLS- and MLC-model phones require at least two-pair wiring and are compatible with AT&T four-pair SYSTIMAX™ wiring. If you need a shorter cord for wall mounting, use AT&T’s two-foot D4BU-29 mounting cord (available separately—see page C-12).An MLS-34D phone connected to extension jack 10 or 11 is used for System Programming. Use an MLS-12D phone for System Programming only if there are no MLS-34D phones installed at your business site.

■Industry-Standard Devices. Industry-standard equipment (including standard phones) require one-pair mounting cords; AT&T D2R mounting cords are recommended.

■Standard Phones. Connect standard touch-tone or rotary phones to the equipment controller for:

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2-4Installing the Equipment

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AT&T II manual Connection of Telephones and Devices, Line and Extension Numbering at the Equipment Controller
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II specifications

AT&T II, a pivotal case in the landscape of telecommunications regulation, emerged from the expansive antitrust actions against the American Telephone and Telegraph Company (AT&T). Following World War II, AT&T had established itself as a telecommunications behemoth, monopolizing the market. The ramifications of this dominance spurred a significant shift in regulatory measures, leading to the dissolution of the Bell System in 1984, which consisted of AT&T and its regional operating companies.

One key feature of AT&T II is its emphasis on promoting competition in the telecommunications sector. The court's decision aimed to dismantle the monopolistic practices that had stifled innovation and restricted consumer choice. By encouraging competition among various service providers, the ruling paved the way for an environment where new technologies could flourish.

The technologies that emerged post-AT&T II significantly transformed the telecommunications landscape. The introduction of new digital switching systems allowed for improved call quality and increased network efficiency. The evolution of fiber-optic technology also played a crucial role, enabling faster transmission speeds and greater data capacity. Moreover, innovative services, such as mobile telephony and broadband internet, proliferated as competition increased.

Another characteristic of AT&T II is its focus on accessibility and consumer protection. The ruling mandated that telecommunications services be available to a broader swath of the population, ensuring that underserved communities had access to essential communication services. This shift not only democratized access but also laid the groundwork for the modern internet revolution, fostering the growth of the digital economy.

The impact of AT&T II can also be seen in the regulatory frameworks that followed. The Federal Communications Commission (FCC) adopted policies aimed at enhancing market transparency and ensuring fair practices among competitors. These regulatory changes helped to create a more equitable playing field, allowing smaller companies to compete against established giants.

In summary, AT&T II marked a turning point in telecommunications history, characterized by a focus on competition, technological advancements, and consumer protection. The dissolution of AT&T's monopoly allowed for the rapid evolution of technology and services, ultimately benefiting consumers and fostering an environment ripe for innovation. This ruling not only redefined the telecommunications industry but also set a precedent for how markets are regulated in the United States.
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