Example Configuration

These two pages show an equipment controller with three 206 modules and three 400 modules, giving this particular configuration a capacity of 16 lines and 18 extensions. Note that two of the extensions are a Hotline phone and a doorphone, which do not use primary lines. Although your configuration may differ, this example shows various devices connected to 10 of the 18 extensions. The circled numbers in the figure refer to the following list, which gives a brief description of the equipment components.

Equipment Controller

The equipment controller in this example contains both the primary and the expansion carriers, plus these components:

Backplanes. The backplanes distribute power to the premises equipment and connect the modules.

206 Modules. Each 206 module has jacks for two lines and six extensions.

400 Modules. Each 400 module provides four line jacks but no extensions. Notice that each 400 module is installed to the right of a 206 module.

Primary Processor Module. The primary processor module manages the components connected to the equipment controller. The following auxiliary equipment jacks are on the processor module:

■PAGE. A loudspeaker paging system plugs directly into this modular jack. The premises equipment is compatible with any AT&T paging system, including the AT&T PagePac6® Plus shown here.

■SMDR. A call accounting device or printer connects to this jack using an AT&T 355A or 355AF adapter. AT&T’s 572 serial printer is shown here.

■MUSIC ON HOLD. An AT&T Magic on Hold® system is connected to this jack to provide custom- ized music and messages for callers on hold. Other types of audio equipment (including a CD player, cassette player, or stereo receiver) can be connected with an audio cord and RCA phono plug.

Expansion Processor Module. The expansion processor module extends the primary processor module’s management capabilities to the modules in the expansion carrier.

Line Jacks. All four jacks on each 400 module and the top two jacks on each 206 module connect to Centrex lines.

Extension Jacks. Inside wiring for telephones and other telecommunications equipment connects to the bottom six jacks on each 206 module.

Network Interface Jacks. These jacks provide access to Centrex lines. Each Centrex line is connected to the equipment controller by plugging one end of the telephone Iine cord into one of these jacks, and the other end into a line jack on a 206 or 400 module.

Expansion Cable. The expansion cable connects the primary processor module to the expansion processor module.

Extensions

This example shows MLS- and MLC-model phones and industry-standard devices connected to the extension jacks in the equipment controller by way of the building’s inside wiring.

Extension Jack 10: These devices are connected:

■MLS-34D Display Phone. Typically, the receptionist on extension 10, called the primary programming extension, has an MLS-34D phone.

■AT&T 267F2 Bridging Adapter. This adapter permits the connection of two devices—in this example a standard touch-tone phone and an MLS-34Dphone—on one extension jack. This is called a combination extension. (You cannot connect two MLS- or MLC-model phones.)

■Standard Phone. The MLS-34D phone on extension jack 10 will not work during a power failure; therefore, the receptionist can use the standard phone.

Extension Jack 11: MLS-34D Display Phone. Another MLS-34D is connected to extension jack 11, or the backup programming extension. You can program the premises equipment from this extension while the phone at extension jack 10 is free to handle calls.

NOTE: An MLS-34D or MLS-12D is required for programming at extension jack 10 or 11, or both. Use an MLS-12D only if there are no MLS-34D phones installed at your site.

Extension Jack 12: Fax Machine and Standard Phone. A fax machine and standard phone are connected together on this extension. This setup lets you share the fax line with a telephone. Alternatively, you can use an MLS- or MLC-model phone at another extension to monitor the fax machine (see page 7-2).

Extension Jack 13: MLS-12D Phone and Bell. A loud bell, to provide loud ringing in a noisy area, is combined with an MLS-12 phone.

Extension Jack 14: MLS-12 Phone. This phone is similar to the MLS-12D telephone (see extension jack 13), but it has no display.

Extension Jack 15: MLS-6 Phone and Answering Machine. An MLS-6 phone and an answering machine are connected to this extension. (See page 7-5).

Extension Jack 16: Standard Phone. A standard touch-tone phone (such as you might have in your home) is connected to this extension jack.

Extension Jack 17: MLC-6 Cordless Phone. An AT&T MLC-6 cordless telephone is connected to this extension. It works like the corded MLS-6.

Note how the Hotline phone and doorphone are connected to the last available extension jacks on the last installed

206 module in the equipment controller:

Extension Jack 26: Hotline—Standard Phone. When the handset of this phone is lifted, another phone rings.

Extension Jack 27: Doorphone. A doorphone is installed at the building entrance. When someone at the entrance presses the doorphone button, the designated extensions (five maximum) in the office alert.

2-6Installing the Equipment

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AT&T II manual Example Configuration, Equipment Controller, Extensions, 6Installing the Equipment
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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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