science

Incumbent local exchange carrier

Incumbent local exchange carrier is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Incumbent local exchange carrier rather than just read about it. In short: An incumbent local exchange carrier (ILEC) is a local telephone company which held the regional monopoly on landline service before the market was opened to competitive local exchange carriers, or the corporate successor of such a firm, in the United States and Canada. Definition An incumbent local exchange carrier is a local exchange carrier (LEC) in a specific area that on the date of enactment of the Telecommunic…

Key takeaways

Incumbent local exchange carrier belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Incumbent local exchange carrier to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Incumbent local exchange carrier from memory before moving on to harder problems.

Reference excerpt

An incumbent local exchange carrier (ILEC) is a local telephone company which held the regional monopoly on landline service before the market was opened to competitive local exchange carriers, or the corporate successor of such a firm, in the United States and Canada.

Definition An incumbent local exchange carrier is a local exchange carrier (LEC) in a specific area that

on the date of enactment of the Telecommunications Act of 1996, provided telephone exchange service on the date of enactment, was deemed to be a member of the National Exchange Carrier Association pursuant to the Code of Federal Regulations (C.F.R) Title 47, section 69.601(b). or is a person or entity that, on or after such date of enactment, became a successor or assignee of a member described in the previous bullet. The Federal Communications Commission (FCC) may, by rule, provide for the treatment of an LEC (or class or category thereof) as an ILEC if:

such carrier occupies a position in the market for telephone exchange service within an area that is comparable to the position occupied by a carrier described previously such carrier has substantially replaced an ILEC described previously such treatment is consistent with the public interest, convenience and necessity

Duties ILECs have the same duties as a LEC and in addition:

Duty to negotiate – The duty to negotiate in good faith the particular terms and conditions of agreements to fulfill the duties described for a LEC and the specific ones for the ILEC. The requesting telecommunications carrier also has the duty to negotiate in good faith the terms and conditions of such agreements. Interconnection – The duty to provide, for the facilities and equipment of any requesting telecommunications carrier, interconnection with the LEC's network – For the transmission and routing of telephone exchange service and exchange access At any technically feasible point within the carrier's network That is at least equal in quality to that provided by the LEC to itself or to any subsidiary, affiliate or any other party to which the carrier provides interconnection On rates, terms and conditions that are just, reasonable and nondiscriminatory, in accordance with the terms and conditions of the agreement Unbundled access - The duty to provide, to any requesting telecommunications carrier for the provision of a telecommunications service, nondiscriminatory access to network elements on an unbundled basis at any technically feasible point on rates, terms and conditions that are just, reasonable and nondiscriminatory in accordance with the terms and conditions of the agreement. An ILEC shall provide such unbundled network elements in a manner that allows requesting carriers to combine such elements in order to provide such telecommunications service. Resale – The duty To offer for resale at wholesale rates any telecommunications service that the carrier provides at retail to subscribers who are not telecommunications carriers Not to prohibit, and not to impose unreasonable or discriminatory conditions or limitations on, the resale of such telecommunications service, Notice of changes – The duty to provide reasonable public notice of changes in the information necessary for the transmission and routing of services using that local exchange carrier's facilities or networks, as well as of any other changes that would affect the interoperability of those facilities and networks. Colocation – The duty to provide, on rates, terms and conditions that are just, reasonable and nondiscriminatory, for physical colocation of equipment necessary for interconnection or access to unbundled network elements at the premises of the local exchange carrier, except that the carrier may provide for virtual colocation if the LEC demonstrates that physical colocation is not practical for technical reasons or because of space limitations.

United States In the United States, ILECs are companies in existence at the time of the breakup of AT&T into the Regional Bell Operating Companies (RBOCs), also known as the "Baby Bells". Various regional independents also held incumbent monopolies in their respective regions. The largest of these was GTE, the second largest ILEC after the Bell System. GTE was later absorbed into Verizon, an RBOC. In some areas, an independent telephone company is responsible for providing local telephone exchange services in a specified geographic area.

Canada In Canada, ILECs are the original telephone companies such as Telus (BC Tel and Alberta Government Telephones), SaskTel, Manitoba Telecom Services (MTS Allstream), Bell Canada and Aliant, as well as any other company that previously held a monopoly to serve a community and continues to do so, or a successor company if it is bought and absorbed. ILECs are obligated to serve the entire exchange area as a "provider of last resort", while CLECs can choose which locations to serve, be it by facilities of their own or by resale of services of an ILEC or another CLEC.

… excerpt ends here. Continue reading the full article.

Worked examples

Example 1 — a first encounter with Incumbent local exchange carrier

Start with the simplest possible case. Write down what Incumbent local exchange carrier claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Incumbent local exchange carrier before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Incumbent local exchange carrier ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Incumbent local exchange carrier

In research: Incumbent local exchange carrier appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Incumbent local exchange carrier in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Incumbent local exchange carrier is common in secondary-school and first-year university syllabi. It links to neighbouring topics Telephony, United States communications regulation, so understanding it makes those chapters shorter.
In everyday life: Look for Incumbent local exchange carrier outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Incumbent local exchange carrier in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Incumbent local exchange carrier means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Incumbent local exchange carrier out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Incumbent local exchange carrier in simple terms?

Why does Incumbent local exchange carrier matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Incumbent local exchange carrier?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Incumbent local exchange carrier.