Albalá Ingenieros ASW3000C01 Manuale utente
ASW3000C01
DVB-ASI AUTOMATIC CHANGE-OVER SWITCH WITH ADVANCED TS
FAILURE DETECTION FUNCTIONS
Version 1.0
Albalá Ingenieros, S.A.
Medea, 4 - 28037 Madrid - Spain
17 November 2014 - © Albalá Ingenieros S.A. - All rights reserved
ASW3000C01
ASW3000C01
DVB-ASI AUTOMATIC CHANGE-OVER SWITCH WITH ADVANCED TS FAILURE
DETECTION FUNCTIONS
Version 1.0
1. DESCRIPTION ...................................................................................................................... 5
1.1. The ASW3000C01 .......................................................................................................................... 5
1.2. Features ............................................................................................................................................. 7
1.3. Block diagram .................................................................................................................................. 8
2. SPECIFICATIONS ................................................................................................................. 9
3. INSTALLATION .................................................................................................................. 11
3.1. Initial inspection .......................................................................................................................... 11
3.2. Safety instructions ...................................................................................................................... 11
3.3. Environmental considerations ................................................................................................ 12
3.4. Power considerations ................................................................................................................. 12
3.5. Installing the module in the mounting frame ................................................................... 12
3.6. Interconnection ............................................................................................................................ 14
3.6.1. Electrical DVB-ASI video connections .......................................................................... 15
3.6.2. GPIO connections ................................................................................................................ 15
4. OPERATION ...................................................................................................................... 17
4.1. Front panel description .............................................................................................................. 17
4.2. Configuration from the front panel ...................................................................................... 18
4.3. Functional description ............................................................................................................... 18
4.3.1. The error conditions ........................................................................................................... 19
4.3.1.1. GPI input ........................................................................................................................ 19
4.3.1.2. Absence of input signal. ........................................................................................... 19
4.3.1.3. Loss of synchronization of the transport stream. ........................................... 19
4.3.1.4. Error in the sync byte of the packets ................................................................... 20
4.3.1.5. PAT errors ...................................................................................................................... 20
4.3.1.6. Continuity error in the PAT packets. .................................................................... 20
4.3.1.7. Useful load of the transport stream .................................................................... 21
4.3.1.8. A percentage of null packets above or below set thresholds ..................... 21
4.4. Operating modes ......................................................................................................................... 21
4.4.1. Automatic Mode operation ............................................................................................. 21
4.4.2. Semiautomatic Mode operation ................................................................................... 22
4.4.3. Manual Mode operation ................................................................................................... 22
4.4.4. Priority inversion: Automatic and Semiautomatic Modes ................................... 22
4.4.5. Output mode selection ..................................................................................................... 22
4.4.6. Signal at the output when errors are present at the inputs ................................ 23
4.4.7. Selection of DVB-T/no DVB-T mode ............................................................................. 23
4.5. Module remote control and supervision ............................................................................. 24
4.5.1. Details of the ASW3000C01 registers ......................................................................... 25
5. GLOSSARY ........................................................................................................................ 29
6. REGULATIONS .................................................................................................................. 31
7. VERSIONS ......................................................................................................................... 33
Albalá Ingenieros | Manual ASW3000C01
1. DESCRIPTION
1.1. The ASW3000C01
The ASW3000C01 automated switch is a selector for two sources of DVB-ASI signals
that operates based upon the presence of signals, specific parameters of those signals or
the activation of GPI signals.
The ASW3000C01 provides two signal inputs, Main and Reserve. The selected input is
distributed to four outputs, and one of those outputs is protected by a bypass relay,
there by guaranteeing continuity of the signal even if a power supply failure occurs or
the module is extracted from the mounting frame.
The criteria for switching are based upon the requirements of the transport stream as
per ETSI TR 101 290 V1.2.1(2001-05) as well as several extra criteria. Each failure
condition can be selected or not for consideration for switching. The conditions that can
be detected are:
- Absence of input signal.
- Loss of the transport stream (TS) packets.
- Errors in the packet headers.
-Absence of or errors in the PAT (Program Association Table) packets during a
programmable interval lasting from 40ms to 10 seconds.
- Usable load of the TS above or below user-established thresholds.
-A percentage of null packets (PID equal to 0x1FFF) above or below the
user-established thresholds.
- Activation of a GPI input to indicate that the signal is not valid.
-The ASW3000C01 module provides three operating modes to establish the manner
in which switching occurs between the inputs.
- Automatic: when no errors are present in the inputs, the input with higher
priority is always selected.
- Semiautomatic: switching from one input to the other only occurs if errors are
detected in one input but not in the other input. This mode minimizes signal
switching.
5
Albalá Ingenieros | Manual ASW3000C01
- Manual: the user, via the front panel or remotely determines which input is
selected at any given moment.
The ASW3000C01 performs switching at the TS packet level. Furthermore, when the
signals are DVB-T type with a difference is delay that is less than four times the packet
period, the switching is seamless.
All switching between the signal sources is indicated by an LED and an audible beep that
can be masked.
Both the signal selected and any error conditions detected at either input are indicated
via open-collector GPOs and via the module's remote control.
It is possible to monitor the ASW3000C01 status remotely using a communications
controller module installed in the same mounting frame. In addition, certain controller
modules provide SNMP management and the ability to record events in a file including
date and time information for further analysis.
The ASW3000C01 is a TL3000 terminal line module and can be housed in a three rack
unit (3 RU) UR3000 mounting frame or a 1 RU UR3100 mounting frame.
6
Albalá Ingenieros | Manual ASW3000C01
1.2. Features
• Automatic change-over switch for DVB-ASI signals.
• Two DVB-ASI inputs.
• Failure detection criteria as per ETSI TR 101 290 V1.2.1.
- Absence of input signal.
- Transport stream sync loss.
- Errors in transport stream packet header.
- PAT errors.
- Transport stream useful payload above or below established thresholds.
- Activation of external GPI input with configurable polarity.
• Supports transport streams with packets of 188 and 204 bytes.
• Distributes the selected input to four outputs.
•Provides a bypass relay on the rear board that enables the input signal to be passed
through to one of the outputs in case of power loss or module removal.
• Switching takes place at packet boundaries to reduce TS data disturbance.
•Seamless switching is available with DVB-T signals when delay between inputs is less
than four TS packets.
• Provides automatic cable equalizers at the inputs.
• Provides three switching modes: automatic, semiautomatic and manual.
• Front panel indication of input selected and operating mode.
• Front panel indication of failure in the main or reserve inputs.
• Acoustic and visual indicators warn against changes in the selected source.
•Module control and supervision can be done remotely when the mounting frame is
equipped with a communications controller module.
•One UR3000 mounting frame can house up to 12 ASW3000C01 modules. If power
supply redundancy is required and FA3000 or FA3001 modules are used then only 10
modules can be housed in the mounting frame. If PSU3300 or PSU3301 modules are
used for this purpose then up to 12 modules can be installed.
• One UR3100 mounting frame can house up to three ASW3000C01 modules.
• Low power.
7
Albalá Ingenieros | Manual ASW3000C01
1.3. Block diagram
8
Albalá Ingenieros | Manual ASW3000C01
2. SPECIFICATIONS
DVB-ASI signal input
Connector BNC
Impedance 75Ω ± 1 %
Return loss >17dB up to 270 MHz
Input return loss when bypass is active >17dB up to 270 MHz
Output protected with bypass relay Yes
Equalizable cable length:
Belden 8281 >100 m
DVB-ASI signal output
Connector BNC
Impedance 75Ω ± 1 %
Return loss >17dB up to 270 MHz
Output return loss when bypass is active >17dB up to 270 MHz
Input to output bypass insertion loss <0.1dB up to 270 MHz
Number of outputs 4
Amplitude 800mVpp ± 10 %
Rise and fall time (20 % - 80 %) 1 ns typ.
DVB-ASI signal
Signal format According to EN 50083-9 standard
GPI input
Connector Plug-in terminal,
3.81mm pitch
Type 100 kΩ pull-up to 5 V
Number of inputs 2
Activation Closing contact to ground
Allowed voltage range 0 .. 24 V
GPO output
Connector Plug-in terminal,
3.81mm pitch
Type Open/closed NPN transistor collector
Number of outputs 3
Allowed voltage range 0 .. 24V 50mA max.
General
Maximum power supply current + 270 / - 270 mA
Operating temperature range 0 .. 50 °C
Approximate weight 300 g
9
Albalá Ingenieros | Manual ASW3000C01
ASW3000C01
10
Indice
Altri manuali Albalá Ingenieros Interruttore
Albalá Ingenieros
Albalá Ingenieros IPA3000C01 Manuale utente
Albalá Ingenieros
Albalá Ingenieros AVP0622C01 Manuale utente
Albalá Ingenieros
Albalá Ingenieros IPA2000C01 Manuale utente
Albalá Ingenieros
Albalá Ingenieros AVP1222C01 Manuale utente
Albalá Ingenieros
Albalá Ingenieros DSW3000C03 Manuale utente
Albalá Ingenieros
Albalá Ingenieros AVP1221C01 Manuale utente
Albalá Ingenieros
Albalá Ingenieros ISW3000C01 Manuale utente
