1

2

INDEX

BACKGROUND

CURRENT SITUATION

DEFINITION OF INMEDIATE

ACTIONS

EXPANSION, GROWTH &

TECHNOLOGICAL MIGRATION

CONCLUSIONS

EDUSAT NET’S TECHNOLOGICALINFRASTRUCTURE

3

BACKGROUND

4

Through the program for educational modernization (1989-1994), the Ministry of Public Education created Education Via Satellite Net (Edusat) as an answer to the country’s growing demand for educational services, including disperse and rural populations by using television.

The pupose of this educational tv system is to address: literacy training, basic education, high school and technical and technological education all of which are the responsability of the Public Education Ministry.

5

Edusat Net has more than 30,000 installed reception systems throughout the country at several institutions such as: “Telemiddleschools”, Technical middle schools, General middle schools, Grammar schools, Indigenous education centers, Teacher’s centers, State Technical Institutions, Universities, Military bases, Correctional Institutions, Federal Electoral Intstitute in several states, Hospitals, National Council for Educational Encouragement Nacional (CONAFE), National Institute for Adult Education (INEA), State Education Ministries and some Latin American Universities

6

Current Situation

7

Before commenting on any expansion, growth or technological migration for EDUSAT Net it is important to quickly mention its origin and current characteristics.

Edusat Net was born from the need to continue broadcasting “Telemiddleschool” (Telesecundaria) which in 1991 was done through open tv using Imevisión (Government channel) and its national broadcasting net. When the government sold Imevisión, it was forced to consider an alternative that required less time to implement, since the agreements undersigned by SEP, to continue with the service were too expensive. It also needed to have national coverage because “Telemiddleschools” are found in rural areas.

8

The technology that met these requirements was

Digicipher 1, an advanced technology and best

satellite provider at the time (Audio Digital

Compression, Video).

This technology evolved by optimizing the use of a

satellite transponder bandwidth and Digicipher 2

technology was acquired. Both technologies are

currently used side by side and allow quality

coverage for Edusat Net.

By using the most sophisticated encription

technologies Edusat Net was born as a “closed”

technology since the transmitters and receptors

both have to be of the same brand to work

properly, for obvious reasons.

9

Taking the disadvantages of this system into account, some processes for the growth of the net have been facilitated by negotiating delivery times and favorable volume pricing. Also, since few brands exist the logistics for control, administration and following of these programs has been simpler.

Almost 17,600 pieces of equipment are DC1 (of which 80% are in “Telemiddleschools”) and almost

14,400 are DC-2.The use of two technologies and two satellites means that these two equipments are not interchangeable without a re-orientation and configuration process that requires skilled technical personnel.

10

In this sense any strategy for massive receptor substitution should consider the demand of technical resources, materials and equipment, this would require as well as the time that such a job would take.

Motorola has stopped producing DC-1 and although it claims it can service DC-2 for five more years, it does so under mandatory upgrading conditions and at very high prices.

It may be worth mentioning that pulling this equipment from the market has been done purely from a commercial and not technological standpoint, thus the argument for obsolescence is not precise.

11

Edusat Net’s satellite uplink is currently being done by“Telecomunicaciones de México (TELECOMM)” at its “Contel Iztapalapa” facilities, where the signal is digitalized, encoded and multiplexed for:

12 TV channels through DC-2 encoder technology,8 TV channels vía DC-1 encoder.

To transmit these services through two satellites (Sol 2 and Satmex 5), as well as 4 corresponding channels to radio signals. For satellite transmission and reception, General Instruments proprietary technology is used (now Motorola).

12

EDUSAT’s NETWORK SIGNAL PROCESSINGEDUSAT’s NETWORK SIGNAL PROCESSING

MICROWAVES

COMPRESSION

ENCODING MULTIPLEXING MODULATION

18

ILCE

1112

13

1417

1516

DGTVEFILTER

FILTER

FILTER

DECODIINGDEMODULATION

DESCOMPRESSIONMODULATIONTV

CONTEL

SATELLITES

13

EDUSAT COVERAGE DC-1 SYSTEM (8 TV CHANNELS)

Edusat Net on Solidaridad II

satellite uses Digicipher 1

(DC-1) technology. It

currently covers 16,600

receptors placed mainly in

rural areas, as is the case of

“Telemiddleschools” and

Indigenous grammar

schools.

SOLIDARIDAD II SATELLITESOLIDARIDAD II SATELLITE

14

EDUSAT COVERAGESYSTEM DC-2 (16 TV CHANNELS)

Edusat Net on Satmex 5 satellite uses

Digicipher 2 (DC-2) technology ,

approximate coverage is of 13,400

receptors.

15

dBw

60256025

60116011 60396039

6008.256008.25

MHz

3030

3434

2.52.5 2828 44

60436043

3636

1.51.5

8 TV CHANNELS8 TV CHANNELS4 RADIO CHANNELS4 RADIO CHANNELS

DC-1DC-1

1 TV CHANNEL1 TV CHANNELWEGENERWEGENER

DVBDVB

SOLIDARIDAD 2 SATELLITE SIGNALSSOLIDARIDAD 2 SATELLITE SIGNALSTRANSPONDER 3NTRANSPONDER 3N

16

64056405

63916391 64196419

6421.756421.75

dBw

MHz

2525

2828

3.153.15282844

64236423

3636

1.51.5

12 TV CHANNELS12 TV CHANNELS2 RADIO CHANNELS2 RADIO CHANNELS

DC-2DC-21 IDC DATA1 IDC DATACHANNELCHANNEL

SATMEX 5 SATELLITE SIGNALSSATMEX 5 SATELLITE SIGNALSTRANSPONDER 24CTRANSPONDER 24C

17

EDUSAT-DGTVE DVB SIGNAL PROCESSINGEDUSAT-DGTVE DVB SIGNAL PROCESSING

ENCODER 16:1MEPG-2 DVB

MULTIPLEXORMODULATORUP/HPA

SATELLITES

DEMODULATORCONDITIONALACCESS

DEMULTIPLEXOR

RFMODULATOR

DECODER TELEVISION

DGTVESTUDIOS

18

EXPANSION, GROWTH & TECHNOLOGICAL

MIGRATION

19

Normal equipment deterioration indicates that the

DC-1 equipment is more susceptible to failure, both

in transmission and reception equipment, they are

however more robust and resistant for

“Telemiddleschool” use. Since DC-1 equipment is no

longer made, it must be substituted by DVB

technology when it fails.

Due to the actual state of Edusat Net there are four

fundamental axes that must be consolidated in the

short and medium term.

20

Controlled expansion and growth of Edusat Net’s

infrastructure. Keeping current technology,

actively participating in establishing policies and

procedures so that each of the country’s states

implements its investment projects while the

three remaining axes are met.

Edusat Net’s technological migration: Toward

standard international open platform with the

participation of diverse brands and models that

guarantee inter-operability. (DVB-RCS)

21

Edusat Net´s Diversification. Using cable TV

systems to broadcast at least two Net channels

having the universal offer of educational TV,

including the National Network of educational and

cultural tv broadcasters.

Technological converging between TV,

computers and Information technology. Edusat

Net’s future will depend on its capacity to add its

teaching advantages, the possibilities of digital

environments, and automated controlled

programming by SUN 12000 servers.

22

International DVB Standard

DVB-S

DVB-S, DVB-C

DVB-S, DVB-C, DVB-T

DVB-S

DVB-S, DVB-C, DSS, ATSC

DVB-S: Satellite DVB-C: CableDVB-T:Land

DVB-S: Satellite DVB-C: CableDVB-T:Land

www.dvb.org

23

IMMEDIATE ACTION DEFINITIONS

24

Migration Program (Stages) 1.- Net widening.- Every new system that is

installed will be done by pointing the Solidaridad 2

satellite in Ku band, we will take advantage of this

point to start training at the national level. 2.- “Telemiddleschool “ susbstitution.- All

equipment will be substituted before the

beginning of the next school cycle (August 2993),

State structural support will be used for this

process. 3.- Satellite change.- Once the 14,000

“telesmiddleschools” migration is completed all

remaining band C equipment, DC1 as well as DC2

will be changed.

25

Using DVB standard on Edusat Net.- Performance tests have been done on this standard and they have been acceptable, but we only have one tv channel to support the “Telemiddleschool” system.

Ku band teleport (DGTVE).- Tests have to be performed on the controlled access system (IRDETO) and also verify the access parameters to the Mexican satellites to be able to use less than 90 centimeter diameter receptor antenna (TVRO).

26

CONCLUSIONS

27

DVB technological standard was created to achieve a uniform environment for digital tv dissemination.

Once DVB standards have been published, they will be available to anyone in the world, notwithstanding were they have been developed and are therefore open standards.

With the introduction of DVB technology, the net will be able to use different brands of satellite receptors (set top box). This diversity of brands on the market will allow the lowering of costs to acquire said receptors.

28

The transmitting (Andrew) antenna are 7.3 meters in diameter, this process will take place in 45 days, meantime, 10,214 pieces of DVB equipment have been delivered to different states and 20,000 systems are planned to be delivered before the beginning of the school cycle.

By using these tools and technological support, Educational TV is seeking to contribute to improve the learning environment in classrooms considering the teacher as the axis for this change and who will be previously trained to use the technological media that the SEP has at its disposal.