ITU ( INTERNATIONAL TELECOM UNION ) RECOMMENDATIONS ::
ITU form the base for specifications of all telecom equipments…whenever we make call either from landline or mobile , receive or send SMS , watch video / TV , surf internet…or any thing which is related to communication , ITU recommendations are there in background so as to make different technologies work together.
Experts from private & public sectors help in forming standards / specifications so as to drive information society world wide.
We can download specifications from ITU web site ( on charging basis ).
Classification of different specs is as follows ::
B—definitions / symbols
C—telecom stats
D—tariff stats
E—telephone services & human factor
F—non-telephone services
G—transmission system
H—multimedia system
I—integrated sevices
J—cable networking & television
K—interference protection
L—outside plant specs
M—network management services
N—television transmission circuits
O—specs for measuring equipments
P—telephone installation and local loop networks
Q—switching & signaling
R—telegraph transmission
S—telegraph terminal equipment
T—telematic services
U—telegraph switching
V—data communication over telephone networks
X—data networks , security
Y—global infra /internet protocol / NGN
Z—languages & general software for telecom systems
Apart from ITU , local PTT ( respective countries ) have their own specifications based on regional conditions…these specs are derivatives of ITU...In India these specs are called as
TEC ( TELECOM ENGINEERING CENTRE ) specifications.
For selling any telecom equipment in India , manufacturers are required to get TEC certificate.
For detailed info ,please contact vsaxena69@hotmail.com