Posts Tagged ‘English’

RES1 Physical layer (5/12)

Thursday, October 27th, 2011

Physical layer

Even if we don’t focus too much on the physical layer, we see the property we expect from the physical layer (such as clock synchronization) and some way to code binary information.

RES1 Standardization (4/12)

Thursday, October 27th, 2011

Standardization organisations

We have a quick view of the different standardization bodies in the telecommunication area and how we can access the documents

RES1 ISO RM (3/12)

Thursday, October 27th, 2011

ISO Reference Model

Here we are, the famous OSI seven layer model. We look at the strange name it uses such as PDU, SDU and SAP. We see the recursive nature of layering, We look at the seven layers and why we don’t have to focus on that number.

RES1 Black Boxes (2/12)

Thursday, October 27th, 2011

Black Box

A Top dow approach of the network giving details of a well known application (Web) and how in fact we can just say that it is interaction with a black box. We give the name of these interaction (Request, Indication, Response and Confirmation) and see that the black box can be decomposed itself into black boxes.

RES1 Introduction (1/12)

Thursday, October 27th, 2011

Introduction

I give the lecture agenda and how this blog works. If you read this blog you are certainly aware of its existence.

MTIA – Fifth day

Wednesday, April 27th, 2011

 

MTIA – Fourth Day – Part 2

Wednesday, April 27th, 2011

 

MTIA – Fourth Day – Part 1

Wednesday, April 27th, 2011

Exercise – BGP and IGP interactions

Monday, April 25th, 2011

A company  has a site  in Europe  and another one in Mexico. They are interconnected by  a private leased line. Each site is locally connected to an ISP (ISP-EU in Europe and ISP-MX in mexico). Border routers are respectively ER-EU in Europe and ER-MX in Mexico. Providers have allocated prefixes α in Europe and β in Mexico. Providers are doing in-gress filtering (i.e. a packet with a source address non allocated  by a provider is discarded by the first provider router).

In  the  rest of the  document, a  host A  (resp.  B)  will designate a host  in Internet (outside company network) close to the ISP-MX (resp. ISP-EU) with a metric linked to BGP announcement. C (resp. D) will represent an equipment in the Mexican (resp. european) part of the company network.

Inside the site, an IGP routing protocol allows all routers to know all internal prefixes.

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MTIA – Third day – Part 2

Monday, April 25th, 2011