1. 1G
JOE DOMINIC
S7 IT-A
R.NO 19

2. 1G
• 1G refers to the first generation of wireless telephone technology
(mobile telecommunications).
• These are the analog telecommunications standards that were
introduced in the 1980s and continued until being replaced by 2G digital
telecommunications.
• The main difference between the two mobile telephone systems (1G

3. • The first commercially automated cellular network (the 1G
generation) was launched in Japan by Nippon Telegraph and
Telephone (NTT) in 1979
• Within five years, the NTT network had been expanded to cover the
whole population of Japan and became the first nationwide 1G
• In 1981, the NMT system simultaneously launched in Denmark,
Finland, Norway and Sweden. NMT was the first mobile phone
network to feature international roaming.

4. • In 1983, the first 1G network launched in the USA
was Chicago-based Ameritech using the Motorola
DynaTAC mobile phone.
• Several countries then followed in the early to
mid-1980s including the UK, Mexico and Canada.

5. - They were analog and hence are were not robust to
interference.
- Different countries followed their own standards, which
were incompatible.
To overcome the difficulties of 1G, digital technology was
chosen by most of the countries and a new era, called
2G, started.
DISADVANTAGES OF 1G SYSTEM

6. Reference
• International journal of wireless communication.
• Mobile Commputing by Dr. Raj Kamal
• Wikipedia- Mobile networks.
-https://en.wikipedia.org/wiki/Mobile_networks
• Tutorials Point- Mobile Networks.
-https://www.tutorialspoint.com/mobile_networks/