Summer Vocational Training
Advanced Level Telecom Training Centre
Advanced Level Telecom Training Centre (ALTTC), Ghaziabad is the apex training
institute of BSNL. An ISO 9001: 2008 accredited institute, ALTTC was set up as a joint
venture of International Telecommunication Union, Geneva, UNDP and the
Government of India in 1975. ALTTC functions on the frontiers of telecom technology,
finance and management and imparts training to the leaders in the business. The
strength of ALTTC lies in the state of art labs, massive infrastructure and trained,
talented and qualified human resource pool.
The Centre's Mission statement is "To Deliver Excellence Through Training".
The training areas cover vast spectrum of topics such as Digital Switching and IN;
Mobile Communication: GSM, 3G, CDMA; Data communication and Information
Technology: MPLS, VPN, Broadband, IPv6, Database Administration, Server
Administartion, IT Security; Optical Networks: SDH, DWDM, NGSDH, NGN, Access
Networks, Management, Telecom Finance, Building Science (Civil and Electrical) and
Telecom Network Planning
What is Telecommunication ?
Telecommunication is communication at a distance by technological
means, particularly through electrical signals or electromagnetic
Switching is basically establishing a temporary path or connection
between two points or it can also be defined as writing at one point of
time and reading at another point of time. There are two modes of
switching employed in our network.
• Circuit Switching
PSTN (Public Switched Telephone Network)
The public switched telephone network (PSTN) is the aggregate of
the world's circuit-switched telephone networks that are operated by
national, regional, or local telephone operators, providing infrastructure
and services for public telecommunication.
FDMA Frequency Division Multiple Access
• Each user on a different frequency
• A channel is a frequency
TDMA Time Division Multiple Access
• Each user on a different window period in time (“time slot”)
• A channel is a specific time slot on a specific frequency
CDMA Code Division Multiple Access
• A channel is a unique code pattern
• Each user uses the same frequency all the time, but mixed with
different distinguishing code patterns
Each host on a TCP/IP network is uniquely identified
at the IP layer with an address.
An Internet Protocol (IP) address specifies the
location of a host or client on the Internet.
The IP address is also known as Protocol address
The IPv4 address is 32 bits long
IPv4 Address Scheme
•In decimal the address range is 0.0.0.0 to
•The IP address is of the form
Router is a device which connects different
networks-frequently over a large distances.
A router is a device that forwards data packets
between computer networks, creating an
Router operates in network layer of OSI
TYPES OF ROUTER
core router is used to connect different cities.
CISCO 12000 series is ex. of core router.
Provide EDGE Router:
this router is used to connect users/hosts.
CISCO 7600 series is ex. of provide EDGE router.