Televes DigiSlot DVB-T modulator, wall mount: Introduction

8

DVB-T modulator

Introduction

Product overview

The product is presented for two types of mounting: onto the wall (Ref. 554511), 

and 19 inch cabinet mounting (Ref. 554611).

The modulator converts the HD A/V baseband signals into a  DVB-T multiplex of 

RF within the range 47 ~ 862 MHz.

It features 2 encoders and 1 additional RF input. The input signals of the 

encoders can come from satellite receivers, CCTV cameras, Blu-ray players, 

antennas, ... etc. Its output is a  DVB-T TV multiplex which can be received with 

the corresponding DTT STB.

The device can be used for monitoring, training courses and presentations, 

schools, universities, hospitals, ..., in addition to being the best choice for public 

premises which off er sporting events, VIP entertainment channels,..  and other.

Blocks diagram

A/V in

Encoder

MUX

Modulator

Mix

RF in

RF out

A/V in

Encoder

Technical specifi cations Installation precautions

This section to explain the cautions the users must have to avoid any injures 

when using or installing the product. For this reason, please read all details here 

before installing or using the product. 

General Precautions

 Must be operated and maintained free of dust or dirty. 

  The cover should be securely fastened, do not open the cover of the products 

with the power on. 

  After use, securely stow away all loose cables, external antenna, and others. 

Power precautions

  When you connect the power source, make sure it will not cause any overload. 

  Avoid operating on a wet fl oor in the open. Make sure the extension cable is 

in good condition. 

  Make sure the power switch is off  before you start to install the device.

Grounding Requirement

All function modules’ good grounding is the basis of reliability and stability of 

devices. Also, they are the most important guarantee of lightning arresting and 

interference rejection. Therefore, the system must follow this rule. 

  Grounding conductor must be a copper conductor in order to reduce high 

frequency impedance, and the grounding wire must be as thick and short as 

possible. 

  

Users should make sure the both ends of grounding wire are electric 

conductor and antirust. 

  It is prohibited to use any other device as part of grounding electric circuit.

  The area of the conduction between grounding wire and device’s frame 

should be no less than 2.5mm

2

Operation

Button introduction

LCD display window.

Display window for setting menu 

Status display when power On.

 DVB-T     XXX.00MHz

X.XXMbps   0.0M

Setting value up

and moving up

To move left

To move right

Setting value down

and moving down

Back step

Confi rm setting

Lock button

DVB-T modulator section

Standard

EN300744

FFT mode

2K, 8K

Bandwidth

6M, 7M, 8M

Constellation

QPSK, 16QAM, 64QAM

Guard Interval

1/4, 1/8, 1/16, 1/32

FEC

1/2, 2/3, 3/4, 5/6, 7/8

MER

≥42dB

RF frequency

47~862MHz, 1KHz step

RF output level

-30~ -10dBm (81~97 dBμV), 0.1dB step

Interface

Front panel

buttons, LCD display

Remote manag.

Web NMS

Language

English

General

Mains

AC 100V~240V

Dimensions

360 x 280 x 50 mm (554511) 

480 x 300 x 44 mm 1U rack 19” ( 554611)

Weight

2.6 kgs

Operating temp.

0~45 ºC

Confi gurations

LCN confi g

Yes

NIT Table confi g

Yes

Settings

Network Name

Yes

Network ID

Yes

Transport Stream ID (TSID)

Yes

Original Network ID (ONID)

Yes

Hierarchy Information

Yes

9

EN

DVB-T modulator

Initial Status 

Switch On, then below status will be displayed, few seconds’ initialization then 

open startup picture

Start up ...

Start OK ...

 DVB-T     XXX.00MHz

X.XXMbps   Y.YYMbps

  DVB-T: indicate the modulation standard of this device 

  

XXX.XX MHz: indicate the output frequency, and the frequency range is 

47~862MHz 

  X.XX Mbps: indicate the encoding bit rate in slot 1

  Y.YY Mbps: indicate the encoding bit rate in slot 2

General setting for Main Menu 

By pressing “Lock” key to enter the main menu, the LCD will display the 

following pages:

1 Alarm Status

2 Encode Setting

3 Modulate Setting

4 IP Output Setting

   

5 Network Setting

6 Saving Config

7 Loading Config

8 Version

User pressing 

UP

 or 

DOWN

 buttons to specifi ed menu item, and then pressing 

ENTER

 to enter the submenus as below: 

1)  

Alarm status

 --- the alarm indicator will light on if there is no A/V signals 

input.

2)  

Encoder setting

 --- choose this submenu, the LCD will show “input setting”, 

press the 

ENTER

 key and control the 

UP

 or 

Down

 key to move the arrow. 

User could fi nd how to set the audio and video encoding bit rate. 

3) 

Modulator setting

When the “modulator setting” submenu has been chosen, users can fi nd below 

diff erent parameters for setting. And the LCD window would respectively show 

like these.

3.1 Bandwidth

3.2 Constellation

3.3 Transmisson Mod

3.4 Guard Interval

   

3.5 Code Rate

3.6 RF Frequency

3.7 RF Outlevel

3.1- 

 Bandwidth

There are three possible options provided for selecting bandwidth: 6M, 7M, and 

8M. When the display shows them, user just need swift 

LEFT

 and 

RIGHT

 key to 

choose and repressing “

ENTER

” for confi rm. 

3.2- 

 Constellation

Three diff erent constellations: QPSK, 16QAM, and 64QAM will be show on the 

LCD window when Constellation been entered. 

    -  QPSK: Quadrature Phase Shift Keying, Selecting this option indicates the 

device works as DVB-S modulation mode 

    -  16QAM: Quadrature Amplitude Modulation is 16 

    -  64QAM: Quadrature Amplitude Modulation is 64 

Setting method just the same, when the display shows them, user just need 

swift 

LEFT

 and 

RIGHT

 key to choose and repressing “

ENTER

” for confi rm. 

3.3-  

Transmission mode

After entering Trans mode, the LCD would show the current working mode. 

User can move 

LEFT/RIGHT

 key and repress 

ENTER

 key to select and confi rm. 

2K and 8K are the options. 

    -  2K: when the device works as current mode, the number of current carrier 

is 2048.

    -  8K: when the device works as current mode, the number of current carrier 

is 8192.

3.4- 

 Guard  interval 

In communications, guard intervals are used to ensure that distinct transmissions 

do not interfere with one another. These transmissions may belong to diff erent 

operators (as in TDMA) or same operator (as in OFDM). 

The purpose of the guard interval is to introduce immunity to propagation 

delays, echoes and refl ections, to which digital data is normally very sensitive.

There are four possible options provided to be selected. They are 1/4, 1/8, 1/16, 

1/32. User can shift the 

LEFT/RIGHT

 key to select and press 

ENTER

 to confi rm. 

3.5- 

 FEC

Forward Error Correction (FEC) rates include 1/2, 2/3, 3/4, 5/6, and 7/8. After 

entering FEC submenu, and the LCD display would shows them, users just need 

press 

LEFT

 and 

RIGHT

 button to choose, and press 

ENTER

 button for confi rm. 

3.6-  

RF Frequency

The RF output frequency range is from 30 to 1000MHz with 1K stepping. After 

entering the RF frequency setting submenu, users the can press 

LEFT

, 

RIGHT

, 

UP

, and 

DOWN

 buttons to adjust the frequency and confi rm by press 

ENTER

button. 

3.7-  

RF out level 

The RF attenuation range is from -30~-10dBm (81~97dBμV) with 0.1dB step. 

After entering this setting submenu, user can shift 

UP/DOWN/LEFT/RIGHT

 key 

to set the output level and press 

ENTER

 to confi rm. 

4) 

IP Output Setting

4.1 IP Output

4.2 Service IP

4.3 Output IP

4.4 Subnet Mask

   

4.5 Gateway

4.6 Port

User can press “

UP/DOWN

” to choose this item. “

Enter

” and “

LEFT/RIGHT

” to 

set the parameters. 

If not set the following parameters will be no use, the IP Output will not work. 

IP Output

    OFF   ON

Service IP

192.168.002.137

Output IP

224.002.002.002

   

Subnet Mask

255.255.255.000

Gateway

192.168.002.000

Port

01234

4.1- 

 IP  Output

The IP Output option, must be enable.

4.2- 

Service IP

The IP Output Port address. The format is xxx.xxx.xxx.xxx (like as 192.168.2.137).

4.3- 

Output IP

The IP Output data receive address. The format is xxx.xxx.xxx.xxx (like as 

224.2.2.2). After set the Output IP address , you must use the new address to 

receive IP Output data.

4.4- 

 Subnet  Mask

General is 255.255.255.0, it is must the same in a local area network.

4.5- 

 Gateway

If the device is in diff erent net segment, you must set the gateway.