---
# System prepended metadata

title: "ARM \U0001F4F1 -  Amphi 1"
tags: [ARM, Amphi, S2]

---

# ARM 📱 -  Amphi 1

###### tags: `ARM` `S2` `Amphi`
---
_amphi avec Raz_ le 💯 [slide](https://moodle.insa-lyon.fr/mod/resource/view.php?id=16187)

Il dort encore bichette :heart: 

Y a plein de ressources cool sur moodle ( Annales 😏, bouquins, etc) sur ce [lien](https://moodle.insa-lyon.fr/course/view.php?id=1993)


Il flex sur le fait qu'il taff avec quasiment tous les operateurs du secteur des réseaux mobile. Il démistifie un grand mythe, il ne fait pas de prog de socket le soir chez lui :cry: 


Il va y avoir beaucoup d'amphi (12, ca fait beaucoup la non ?)
:warning: Il faut faire un rapport optionnel (j'ai pas compris sur quoi et askip c'est chaud 📉 ET il faut bien le faire, donc pas forcément rentable)
> 30min apres il a toujours pas commencé le cours


On parle de Claude Chappe, et de son super réseau
![](https://i.imgur.com/qabtjyt.png)

Un peu de Bell aussi, c'est le père de la téléphonie moderne
## Cellular 
> [name=Hamza] sorry I started writing in eng from here 
### 2G 
- GSM uses Time division multiple access TDMA (more detail later on)
- Initial standard 95 (IS95) : code division multiple access ([CDMA](https://en.wikipedia.org/wiki/Code-division_multiple_access))
- evolution GSM => GPRS (2.5G 40kbps)=> EDGE (even better rate)

### 3G 
with more use of internet there was this need for higher rates so we change protocol to move to 3G
- rate up to 3Mbps
- decrease connection establishement time
- some QoS
- new services VoIP MobileTV location based services
- new devices 

##### Technologies:
- generalised CDMA (code devision multiple access)
US and SK had already CDMA antenna (software update only CDMA2000) rest of the world and europe had to install new infrastructure from scratch => Universal Mobil Telecommunications System (UMTS)
Evolution of 3G : HSPA (H+) High speed packet access (software update too) 42Mbps in down 7Mbps in up 

### 4G 
- Native IP network
- scalable channel bandwidth
- no more CDMA (problem : too much energy hungry) => OFDMA
- handover accross technologies
- rate up to 1Gb theoretical
#### Almost 4G 
not compliant with 4G data requirement
- WiMAX worldwide interoperability for microwave access
- LTE(advanced) expected to be the first 4G compliant 

### Satellite phone
with SpaceX and Amazon we still don't know and can't tell how it's gonna be in the futur, last time we tried in the 90s it didnt work out...
### Cordless phones 
Raz : "Not gonna talk about it" *raz talks about it anyway*

### Public safety networks
these agencies use TETRA are secured and are independent from the rest of the notwork and are more advanced 

















