SRS-01 SRS-02 Encoder 4MPX-ASI Decoder ASI-4MPXUserManuals~SRS_[EN].pdf · SRS-02 Encoder 4MPX-ASI...

SRS-01 SRS-02

of 31

SRS-01

SRS-02

Encoder 4MPX-ASI

Decoder ASI-4MPX

User Manual

SRS-01 SRS-02

of 31 Version 2.0

0. Summary

1. GENERAL DESCRIPTION ................................................................................................................... 3

2. TECHNICAL SPECIFICATIONS......................................................................................................... 4

2.1. SRS-01. ................................................................................................................................................... 4 2.2. SRS-02. ................................................................................................................................................... 4 2.3. LOOP ENCODER-DECODER. ................................................................................................................... 5

3. INSTALLATION. .................................................................................................................................... 6

4. THEORY OF OPERATIONS................................................................................................................. 7

4.1. BLOCK DIAGRAM. .................................................................................................................................. 7 4.1.1. SRS-01. ................................................................................................................................................ 8 4.1.2. SRS-0.2 .............................................................................................................................................. 12 4.2. USER INTERFACE (KEYPAD + DISPLAY). ............................................................................................. 15 4.2.1. SRS-01. .............................................................................................................................................. 17 4.2.2. SRS-02. .............................................................................................................................................. 20

5. EXTERNAL DESCRIPTION............................................................................................................... 24

5.1. SRS-01. ................................................................................................................................................. 24 5.1.1. FRONT PANEL. .................................................................................................................................... 24 5.1.2. REAR PANEL. ...................................................................................................................................... 26 5.2. SRS-02. ................................................................................................................................................. 28 5.2.1. FRONT PANEL. .................................................................................................................................... 28 5.2.2. REAR PANEL ....................................................................................................................................... 30

SRS-01 SRS-02

of 31

1. General Description

The SRS systems (Software Radio System) are the last series of Elber products in the

analogue audio (mono or MPX stereo) application field.

The SRS-01 and the corresponding receiving equipment SRS-02 were realized for the

transport of the analogue signal over digital microwave link with ASI interface, utilizing for

example the Elber modem DDM310.

In detail, in the SRS-01 up to 4 MPX signal with level from 0 to +9 dBm (on an impedance

of 600 Ohm) can be accepted as input; a level regulation circuit, programmable by user

interface (3 dB step) let to have always the same level before the A/D conversion.

Digitalization of signals is performed with a 13 bit resolution and the samples are

encapsulated in a DVB-ASI standard frame with a bit-rate of 9.2 Mbit/s.

The ASI output can be connected directly to the input of an Elber digital link or multiplexed

by an ASI concentrator like the RK210/RMX4 together with other heterogeneous streams

(ex.: TV encoder output, MUX DVB-T output or other interfaces).

The digital link should perform a transparent transport of the information, that’s to say no

data should be modified passing from the transmitting site to the receiving site.

The ASI stream received should be decoded by the SRS-02, which recovers the MPX

signals samples from the ASI stream and drives them towards 4 D/A converters.

The following amplifying stages permit to have a 6 dBm signal (on 600 Ohm impedance) at

the output, with the possibility of a digital level regulation (max ±6dB).

Functions management and device monitoring can be done by user interface (keypad and

LCD installed on the front panel). 4 contacts without voltage on the rear panel are also

available; every contact is referred to the respective MPX channel (1 to 4).

Optionally, it is possible to generate 4 carriers, modulated by the MPX carried in the ASI

stream, in a 0-18MHz baseband; these carriers can be up-converted in FM band by an

external up converter in order to utilize them as exciter of a FM transmitter.

Another option, complementary to the previous, is a receiver of a base band (0-18 MHz)

which can demodulate up to 4 carriers and transport the MPX samples over the ASI

stream.

SRS-01 SRS-02

of 31 Version 2.0

2. Technical Specifications.

2.1. SRS-01.

Bandwidth 100 kHz

MPX input connectors BNC Female

ASI output connector BNC Female

ASI stream bitrate 9,220 Mbit/s

MPX input level 0-9 dBm

Input impedance 600 Ohm

Control Front Panel

Supply AC: 230 V/50Hz or 110 V/60Hz DC: 22V ÷ 65V

Max consumption 30 W

Width 482 mm

Height 44 mm

Depth 480 mm

Weight 4 Kg

Operative temperature range -10°C÷60°C

Relative humidity 0-95% non condensing

2.2. SRS-02.

Bandwidth 100 kHz

MPX output connector BNC Female

ASI input connector BNC Female

ASI output connector BNC Female

MPX output level 6 dBm (adjustable)

MPX output impedance 600 Ohm

BB bandwidth 0-22 MHz

Maximum tuneable frequency 18MHz

BB output impedance 75 Ohm

BB carrier level -21 dBm

Max carriers 4

Deviation Adjustable step 6 dB

Control Front panel

Supply AC: 230 V/50Hz or 110 V/60Hz

DC: 22V ÷ 65V

Max consumption 30 W

Width 482 mm

Height 44 mm

Depth 480 mm

Weight 4 Kg

Operative temperature range -10°C÷60°C

Relative humidity 0-95% non condensing

SRS-01 SRS-02

of 31 Version 2.0

2.3. Loop encoder-decoder.

Bandwidth 100 kHz

MPX

Amplitude/frequency response < 0.1dB

S/N > 76dB

S/N weighted CCIR468.2 > 68dB

Stereo separation > 43dB

THD+N < 0.15%

Decoded Base-Band

Amplitude/frequency response < 0.1dB

S/N > 70dB

S/N weighted CCIR468.2 > 62dB

Stereo separation > 40dB

THD+N < 0.25%

SRS-01 SRS-02

of 31 Version 2.0

3. Installation.

1. Open the package box, using a cutting tool, ensuring no damage is done to the

content. Verify any damage caused during transportation.

2. Check the package contents. The package should contain:

a. SRS-01.

b. SRS-02.

c. Two AC power cords.

d. Two DC power cords.

e. User Manual.

3. Install the control units in a cabinet rack. The space required is 1 rack unit.

4. Verify that there is sufficient clearance on both sides of the equipment in order not

to restrict air flow.

5. No heat sources should be placed too close to the equipment: the proper

functioning is warranted for ambient temperature between -5°C to +60°C.

6. Install the power cord and connect to the primary power source.

7. Make the ground connection to the screw located on the rear of the equipment, to

meet the EMC directives. Assure of the right input voltage reading the data on the

user manual or on the adhesive stickers, located on each equipment, that show the

register number.

8. Switch on the power switch of the control units located on the rear of the equipment.

The state and the operations of the device can be checked using the keyboard and

the display following the instructions in the paragraph related to the user interface

4.2.

SRS-01 SRS-02

of 31 Version 2.0

4. Theory of operations.

4.1. Block diagram.

REGOLATORE_INGRESSI_AUDIO

Figure 1 - Block Diagram

SRS-01 SRS-02

of 31 Version 2.0

As results from the block diagram, the system is composed of two macro-blocks:

1. SRS-01

2. SRS-02

4.1.1. SRS-01.

The SRS-01, as results from the block diagram, is composed of 8 boards:

1. Power Supply

2. Microcontroller_DSL

3. Keypad_CU

4. Regolatore ingressi audio

5. FM_TV_MOD

6. 4MPX_ASI

7. Allarmi_ponti_PVT_RAI

8. Motherboard PM

SRS-01 SRS-02

of 31 Version 2.0

4.1.1.1. Power Supply.

The power supply can be:

A.C. 230 V +/-20% 50Hz

115 V +/-10% 60Hz

D.C. 25 ÷ 65 V

Power 60W

The installed power supply protection fuse on the alternating current is 1.6 amps. An

automatic switch is present between the two supplies. In case the A.C. current reaches a

lower threshold, the input supply is switched to D.C. current. The switching occurs

instantaneously without causing any power interruption of the equipment.

The D.C. voltage input connector is a 4 pin connector. The power cable must be

connected to pin 2 and 4, independent of the polarity.

The D.C. input is galvanically isolated from the equipment earth.

Figure 2: D.C. Power Connector.

4.1.1.2. Microcontroller_DSL

The microcontroller aims for following functions:

� Configuring of audio input level.

� Audio levels monitoring.

� Keypad, LCD display, led management.

� Alarms management.

SRS-01 SRS-02

of 31 Version 2.0

4.1.1.3. Keypad_CU.

The keypad board is installed directly on the front panel. It is composed of the 24x2

characters LCD display, the 16 Led and the 6 keys for menu scrolling and selection.

4.1.1.4. Regolatore ingressi audio.

This board is equipped with switches, digitally configurable, which enable 4 different

attenuation networks for each input.

4.1.1.5. FM_TV_MOD.

The FM_TV_MOD board is the digital processor; it accepts 4 MPX audio channels as

input.

This compact board performs a full-digital processing of the audio signals generating at the

output, on a parallel interface, the digital data for the 4MPX-ASI board.

4.1.1.6. 4MPX-ASI.

The 4MPX-ASI board accepts as input parallel data generated by the digital processor and

converts them in ASI format with a bitrate of 9.220 Mbit/s.

4.1.1.7. Allarmi_ponti_PVT_RAI.

This board is equipped with 4 relays digitally driven in order to warrant the signalling of bad

functioning or absence of each input channel.

4.1.1.8. Motherboard PM.

The PM motherboard is designed to house up to 4 standard size boards and 2 of reduced

dimensions or 2 standards and 6 smaller sizes. It is also designed to incorporate the

Microcontroller_DSL, Power_supply boards and the voltage transformer. The presence of

the motherboard extensively reduces the use of interconnecting cables which would

otherwise be very complex. It also provides for future upgrades.

SRS-01 SRS-02

of 31 Version 2.0

Figure 3 – Mother Board

Smaller boards

Trasformer

Microcontroller

Supply

Standard Boards

SRS-01 SRS-02

of 31 Version 2.0

4.1.2. SRS-0.2

The SRS-02, as results from the block diagram, is composed of 8 boards:

1. Power Supply

1. Microcontroller_DSL

2. Keypad_CU

3. FM_TV_DEM

4. ASI-4MPX

5. Motherboard PM

6. Allarmi_ponti_PVT_RAI

7. DAC_Subcarrier

4.1.2.1. Power Supply.

See paragraph 4.1.1.1.

4.1.2.2. Microcontroller_DSL.

The microcontroller aims for following functions:

� Configuring of audio output level.

� Audio levels monitoring.

� Baseband carriers frequency synthesis.

� Baseband carriers deviation regulation.

� Keypad, LCD display, led management.

� Alarms management.

4.1.2.3. Keypad_CU.

The keypad board is installed directly on the front panel. It is composed of the 24x2

characters LCD display, the 16 Led and the 6 keys for menu scrolling and selection.

SRS-01 SRS-02

of 31 Version 2.0

4.1.2.4. FM_TV_DEM.

The FM_TV_DEM board is a digital processor which accepts as input a parallel data

stream coming from the ASI-4MPX board.

If the data stream was generated by a SRS-01, the digital processor finds and separates

the data of each channel and sends them to 4 different D/A converter in order to

reconstruct the original MPX signals.

Another function is the generation of a multiplex composed of up to 4 carriers in the 0-18

MHz baseband, modulated by the content of each original MPX channel.

4.1.2.5. ASI-4MPX

The ASI-4MPX board is an ASI receiver which delivers to the digital processor the parallel

data transported by the ASI stream itself.

On the board is installed a PLL circuit driven by the processor in order to lock the VCXO

utilized in the SRS-01 at the digital data generation.

The board generates only the phase error signal, available on a SMB connector to connect

it to the DAC-SC board.

This last board gives back the precise clock to the ASI-4MPX board which uses it as

system master-clock.

4.1.2.6. Motherboard PM.

See par. 4.1.1.8.

4.1.2.7. Allarmi_ponti_PVT_RAI.

See par. 4.1.1.7

SRS-01 SRS-02

of 31 Version 2.0

4.1.2.8. DAC_SC.

The DAC-SC board has two functions:

1. It receives on a 26 pin connector the modulated carriers digital data coming from

the processor and sends them to the Tx DAC, to generate the baseband signal,

output of the equipment.

2. It receives the 44,736 MHz VCXO, installed on the board, control voltage from the

ASI-4MPX board, and generates a precise clock, locked to the data, to be used as

master clock. This second function is necessary in order to minimize the Tx DAC

output spurious content.

SRS-01 SRS-02

of 31 Version 2.0

4.2. User interface (keypad + display).

The setup, control, and monitoring is provided through the navigation in the embedded

software menu presented on a 24x2 alphanumeric display and operated by a six way

keypad.

The six way keypad enables navigation through the various menus of the embedded

system. The function of the keypad depends on the menu position. A short description

follows:

Configuration menu Keys

Position 1 Other positions Status menu

UP Previous menu Previous menu

DOWN Next menu Next menu

RIGHT Cursor scrolls

one position

to the right

Cursor scrolls one position to

the right

Not used

LEFT No use Cursor scrolls one position to

the left

No use

ENTER Next Menu Saves and applies changes Next Menu

ESC Displays Main

Menu

Discard any changes Displays Main

Menu

Table 1: Menu Description

SRS-01 SRS-02

of 31 Version 2.0

Figure 4 – Control Menu

Table 1 – Main menu description

Option Description

Main Menu The name of the equipment, the status

and the number of channels present are

shown.

Version display This menu is automatically shown for

three seconds, after that the display

returns to the main status menu.

It shows the firmware version of the

board installed.

Configuration It lets to change every configuration

parameter of the equipment.

Status It lets to verify the status of each

parameter of the equipment.

SRS-01 SRS-02

of 31 Version 2.0

4.2.1. SRS-01.

4.2.1.1. Configuration menu.

The configuration menu let the user to change the equipment parameter.

The Figure 5 shows its tree structure.

Figure 5 – SRS-01 configuration menu tree.

SRS-01 SRS-02

of 31 Version 2.0

Table 2 – Configuration menu description

Option Description

Alarm led setting

It sets the alarm condition for which

the front panel ALARM led becomes red.

� ASI unlocked

� No MPX 1

� No MPX 1-2

� No MPX 1-2-3

� No MPX 1-2-3-4

Audio 1 Level Control

It sets the attenuation network which

best matches the MPX input 1 signal

level. Moreover, it shows the encoder

input level as monitor.
















SRS-01 SRS-02

of 31 Version 2.0

4.2.1.2. Status menu.

The status menu let the user to monitor the equipment performance and status.

Figure 6 - SRS-01 status menu tree.

Table 3 – Menu description

Option Description

MPX1 MPX2

It shows the encoder input levels of MPX

1 and 2.

MPX3 MPX4

It shows the encoder input levels of MPX

3 and 4.

SRS-01 SRS-02

of 31 Version 2.0

4.2.2. SRS-02.

4.2.2.1. Initial setting.

At the switch on of the equipment, push LEFT and RIGHT button till the following menu

appears:

“SELECT MF OSCILLATOR: “

“80MHz 90MHz “

Select the up-conversion oscillator utilized for the correct visualization of the synthesized

frequency.

4.2.2.2. Configuration menu.

The configuration menu let the user to change the equipment parameter.

The Figure 7 shows its tree structure.

SRS-01 SRS-02

of 31 Version 2.0

Figure 7 - SRS-02 configuration menu tree.

SRS-01 SRS-02

of 31 Version 2.0

Table 4 – Configuration menu description.

Option Description

Alarm led setting

It sets the alarm condition for which

the front panel ALARM led becomes red.

� ASI unlocked

� No MPX 1

� No MPX 1-2

� No MPX 1-2-3

� No MPX 1-2-3-4


It sets the MPX 1 output level.

To clarify, besides is shown the level

of the signal coded by the SRS-01.

100% correspond to 2190 mV, 6dBm on 600

Ohm.

The regulation is performed in 0.2 dB

step from -6dB up to + 6dB.

Some value can saturate the output

signal, generating distortions.

At 100%, the security margin is 1 dB.

Audio 2 Level Control Idem for MPX 2.



SC1 Frequency

It sets the baseband output carrier 1

frequency, with an offset of 80 or 90

MHz, depending on the external

conversion oscillator frequency.

The permitted bandwidth are:

88-98 MHz (LO = 80 MHz)

98-108 MHz (LO = 90 MHz)

Resolution is 10Hz.

It’s also available the possibility of

disable the carrier.

SC2 Frequency Idem for carrier 2.



SC1 Deviation It sets the deviation sensibility of

carrier 1.Values are referred to 100% of

modulation and have 6dB step.

SC2 Deviation Idem for carrier 2.



SRS-01 SRS-02

of 31 Version 2.0

4.2.2.3. Status menu.

The status menu let the user to monitor the equipment performance and status.

Figure 8 shows the tree structure.

Figure 8 - SRS-02 status menu tree.

Table 5 - SRS-02 status menu description

Option Description

MPX1 MPX2

It shows the encoder input 1 and 2

levels.

MPX3 MPX4

It shows the encoder input 3 and 4

levels.

SRS-01 SRS-02

di 31 Version 2.0

RS-232

Connector

LED

LED

6 buttons

keypad

Display LCD

24x2

5. External Description.

5.1. SRS-01.

5.1.1. Front Panel.

Figure 9 - SRS-01 Front Panel

SRS-01 SRS-02

of 31 Version 2.0

5.1.1.1. Indicators and controls.

Item Description

LED Green: equipment switched on

AUDIO1 AUDIO2 AUDIO3 AUDIO4 BASEBAND DVB-ASI ALARM

GREEN ORANGE RED

MPX 1 present MPX 1 level higher

than 115% of

standard value

(2190mV or 6dBm on

600 Ohm)) or lower

than 9%

MPX 1 absent

MPX 2 present

Idem for MPX 2 MPX 2 absent

MPX 3 present


MPX 4 present


Not used

Not used Not used

Encoder ok Not used Encoder not

running

The equipment

respects the

conditions set

by user

interface

Not used The equipment

doesn’t respect

the conditions

set by user

interface

6 buttons keypad

Keypad used for menu browsing

LCD Display alphanumeric 24×2

5.1.1.2. Connectors description.

RS232: Firmware uploading DB9 connector.

� Pin 2 Rx

� Pin 3 Tx

� Pin 5 Ground

� Other pins not connected.

SRS-01 SRS-02

of 31 Version 2.0

Ground

AC connector

Fuse box

MPX input

connectors

DVB-ASI

Connectors DC connector

Network

switch on/off Alarms

contacts

5.1.2. Rear panel.

Figure 10 - SRS-01 Rear panel

SRS-01 SRS-02

of 31 Version 2.0


Connector Description

Connectors Connector Description

MPX 1 MPX input connector, BNC




ASI OUT ASI output connector, BNC

ASI AUX ASI output connector, BNC Alarms contacts Pin 1: OPEN -> NO MPX 1

CLOSED -> MPX 1 OK

Pin 2: OPEN -> NO MPX 2

CLOSED -> MPX 2 OK


CLOSED -> MPX 3 OK


CLOSED -> MPX 4 OK

DC Connector Input 25÷65 V DC.

Network switch on/off ON/OFF of the equipment

Fuse box 230V 1.6A

AC Connector 230V 50/60Hz – 115V 50/60Hz

SRS-01 SRS-02

of 31 Version 2.0

Connector

RS-232

LED

LED

6 buttons

keypad

Display LCD

24x2

5.2. SRS-02.

5.2.1. Front Panel.

Figure 11- SRS-02 front panel.

SRS-01 SRS-02

of 31 Version 2.0

5.2.1.1. Indicators and controls.

Item Description

LED Green: equipment switched on

AUDIO1 AUDIO2 AUDIO3 AUDIO4 BASEBAND DVB-ASI ALARM

GREEN ORANGE RED

MPX 1 present MPX 1 level

higher than

115% of

standard value

(2190mV or 6dBm

on 600 Ohm)) or

lower than 9%

MPX 1 absent

MPX 2 present


MPX 3 present


MPX 4 present


At least one

carrier enabled

Not used No base band carrier

enabled

Decoder locked Not used Decoder unlocked, no

ASI at input.

The equipment

respects the

conditions set by

user interface

Not used The equipment doesn’t

respect the conditions

set by user interface

6 buttons keypad

Keypad used for menu browsing

LCD Display alphanumeric 24×2

5.2.1.2. Connectors description

RS232: DB9 connector for serial communication

�

� Pin 2 Rx

� Pin 3 Tx

� Pin 5 GND

� Other Pin not connected

SRS-01 SRS-02

of 31 Version 2.0

General

Ground

AC Connector

Fuse box

MPX output

connector

DVB-ASI

connectors DC Connector

Network

On/off switch Relay

contacts

Baseband

output

connector

5.2.2. Rear panel

Figure 12 - SRS-02 Rear Panel

SRS-01 SRS-02

of 31 Version 2.0


Connector Description

Connectors Connector Description

MPX 1 Output connector MPX, BNC




ASI IN ASI input connector BNC

ASI OUT ASI output recovered, BNC

BB OUT BB connector, BNC Relay connector Pin 1: OPEN -> NO MPX 1

CLOSED -> MPX 1 OK


CLOSED -> MPX 2 OK


CLOSED -> MPX 3 OK


CLOSED -> MPX 4 OK

DC Connector Input 25÷65 V DC.

Network On/off switch

Equipment ON/OFF

Fuse box 230V 1.6A

AC Connector 230V 50/60Hz 115 50/60Hz

SRS-01 SRS-02 Encoder 4MPX-ASI Decoder ASI-4MPXUserManuals~SRS_[EN].pdf · SRS-02 Encoder 4MPX-ASI...

Documents

Transcript of SRS-01 SRS-02 Encoder 4MPX-ASI Decoder ASI-4MPXUserManuals~SRS_[EN].pdf · SRS-02 Encoder 4MPX-ASI...