100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Digital local exchange $2.99   Add to cart

Essay

Digital local exchange

 1 view  0 purchase
  • Course
  • Institution
  • Book

Digital local exchange solved task

Preview 1 out of 3  pages

  • August 6, 2021
  • 3
  • 2021/2022
  • Essay
  • Unknown
  • A
avatar-seller
Digital local exchange
• Local or subscriber loops connect subscribers to local exchanges, which are
the lowest-level exchanges in the switching hierarchy.

These are the main tasks of the digital local exchange:-

• Detect off-hook condition, analyze the dialed number, and determine if a
route is available.

• Connect the subscriber to a trunk exchange for longer distance calls.

• Connect the subscriber to another in the same local area.

• Determine if the called subscriber is free and connect ringing signal to her.

• Provide metering and collect charging data for its own subscribers.

• Convert 2W local access to 4W circuit of the network.

• Convert analog speech into a digital signal (PCM).

Note: The size of local exchanges varies from hundreds of subscribers up to tens
of thousand subscribers or even more. A small local exchange is sometimes
known as a remote switching unit (RSU) and it performs the switching and
concentration functions just as all local exchanges do. A local exchange reduces
the required transmission capacity (number of speech channels) typically by a
factor of 10 or more;

Trunk Network
• The below Figure shows a simplified structure for a network where higher
levels than local exchanges are shown as a single level of trunk exchanges.

• The local exchanges are connected to these trunk exchanges, which are
linked to provide a network of connections from any customer to any other
subscriber in the country.

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller sammunbjwa. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $2.99. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

75632 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling
$2.99
  • (0)
  Add to cart