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 PROTECTION SWITCHING




 

 

 

 

 

 

 

 

 

 

 

 

PROTECTION SWITCHING
ASI / SDI / HD / G.703 / Video / Audio
 

AMS-4171    Relay Changeover Switcher Video/SDI + 2 Audio
AMS-4370    HD, SDI, ASI, G.703, Video 4 Port Changeover Relay

DDA-3020   155Mb/s (STM-1) G.703 Data DA
ZDA-3021RH    Double Rear Assembly for Handshaking 2 x DDA-3020's

DDA-3312    270Mb/s ASI / SDI Path Protection DA

ZDA-4311RH    Double Rear Assembly for Handshaking 2 x DDA-3312's

DDA-4301    (E3 / DS3) G.703 Data DA

ZDA-4300RH    Double Rear Assembly for Handshaking 2 x DDA-4301's

HDA-4521    Dual 1 In, 3 Out 1.485Gb/s HD / 270Mb/s SD Reclocking DA

AMS-4171 Relay Video & Audio Switch

Applications:
  • One video and two balanced audio changeover switches in one package
  • Video path suitable for HDSDI (1.485Gb/s), SDI (270 Mb/s), analogue video, ASI data streams and G.703 @ 2, 8, 34, 45, 144, 155 Mb/s
  • Audio path suitable for 2 balanced, or 4 unbalanced, audio or data signals
  • Married or independent operation
  • Default path on power fail
  • Local or remote control
  • Optional plug-in SNMP monitoring and control module
  • Front panel LED status indicators

General

The AMS-4171 consists of one "video" and two "balanced audio" switches. Each switch is arranged as a changeover set with two inputs and two outputs. No terminations are provided on the board allowing the switcher to be used in a wide variety of applications and with signals of various types and impedances.
The "video" path uses enhanced performance relays to provide switching capabilities for high-speed data signals up to 1.485 Gb/s and may be used with analogue video, SDI, HDSDI, ASI or G.703 data signals.
The "audio" path may be used for balanced or unbalanced audio or control signals (RS232, RS422, RS485 etc).
The AMS-4171 is ideally suited to applications where a simple choice between two inputs or outputs is required and may be easily driven by audio, video or other detector circuits for automatic path selection

Front panel switches allow a choice of local or remote control operation.
Front panel LED indicators are used to indicate the status of each relay circuit.
Remote control is via a switch to ground connection, where video and audio may be operated independently or with audio following video by means of link settings.
An optional SNMP (Simple Network Management Protocol) plug-in module is available for remote monitoring and control when used in conjunction with IRT's 4000 series frame fitted with SNMP capability.
The AMS-4171 is designed to fit IRT's standard Eurocard frames as well as IRT's 4000 series frame for use with IRT's SNMP system and may be used alongside any other of IRT's analogue or digital Eurocards.

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AMS-4370HD  HD, G.703, ASI, SDI, Video 4 Port Changeover Relay

Features

 

  • Signal path suitable for HD (1.4Gb/s), SDI , analogue
    video, ASI data streams and G703 signals @ 2, 8, 34, 45,
    144 Mb/s.
  • Momentary Set/Reset or HI/LO logic control.
  • No path change on power fail.
  • Local or remote control.
  • Front panel LED status indicators

General

The AMS-4370HD is a magnetic latching 4 port changeover switcher using enhanced performance relays which provide switching capabilities for high speed data signals up to 1.4 Gb/s. It is suitable for switching high definition video, ASI, SDI or G.703 data streams or analogue video signals, provided that they have characteristic impedances of 75Ω.
The AMS-4370HD is arranged as a changeover switch with two inputs and two outputs. No terminations are provided on the board allowing the switcher to be used in a wide variety of applications and with signals of various types and impedances.
The magnetic latching characteristic of the high performance relay allows momentary control and also provides for no change of path during power loss. Remote changeoverchangeover is by a momentary ground connection.The AMS-4370HD is ideally suited to applications where a simple choice between two inputs or outputs is required and may be easily driven by detector circuits for automatic path selection.
For best performance the outputs should be connected to inputs with automatic cable equalisation.
Remote indication of tally and local/remote status is provided for integration into central alarm and monitoring systems.
The AMS-4370HD relay card is built to the Eurocard format and will mount in an IRT 1RU or 4000 series 3RU frame.      

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DDA-3020 155 Mb/s G.703 (STM-1) Data Distribution Amplifier

Features
  • Adaptive cable input equalisation.
  • Data regeneration.
  • Front panel monitoring facility.
  • Protection switching facility.
  • External alarms and bypass.
  • Redundant pair operation capability.
  • Simple Network Management Protocol (SNMP) monitoring.
  • Compatible with other IRT Eurocard modules and frames.

General

The DDA-3020 data distribution amplifier is intended for use with STM1 data signals conforming to the ITU Rec. G.703. The DDA-3020 is primarily intended for use in pairs with a double width rear assembly (ZDA-3021RH) for automatic path protection applications, although it is supplied as standard with its own rear assembly for stand-alone applications.

Four outputs are provided at the rear of the module with an additional output for monitoring purposes on the front panel. One output (O/P 3) is controlled by relays to provide a bypass signal from the input in the event of a power failure.

Indicators are provided on the front panel for:

DC power
Data loss
AIS detect
Module in service
Module in standby

Changeover inhibit and changeover request switches are provided on the front panel for use where modules are linked in pairs for redundancy. For this configuration the ZDA-3021RH double width rear assembly is needed to link the logic sections of two modules.
When used as a line equaliser or distribution amplifier the DDA may be housed in any of IRT's standard Eurocard frames. When used in pairs for handshake operation only 3 RU chassis types may be used so that the double width rear assembly may be used.
The DDA-3020 is also equipped with Simple Network Management Protocol (SNMP) monitoring so that status and alarms can be remotely monitored and controlled via an Ethernet connection. This function is only available when the unit is housed in an IRT 4000 series frame fitted with the SNMP agent module, CDM-4000.

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ZDA-3021RH Handshake connection 155 Mb/s Data Amplifiers

Features

Applications:

  • Redundant pair operation.
  • Protection switching facility.
  • External alarms from each module.
  • One output bypass on power loss

General

The DDA-3020 is a 155Mb/s G.703 (STM-1) distribution amplifier that incorporates a protection switching facility for the switching in of signals from a standby module when a fault is detected.
To facilitate this mode of operation, the ZDA-3021RH provides all of the required signal and logic interconnections between two DDA-3020 modules.
The individual module alarms are also provided for remote monitoring purposes.
Three switched and two non-switched outputs are provided at the rear of the module with an additional output for monitoring purposes on each front panel. One output (O/P 3) is controlled by relays to provide a bypass signal from the input during a power failure.

A loss of input signal or an Alarm Indication Signal (AIS) detected in the data stream generates a changeover request for a companion unit. In addition, the module may be forced into bypass mode by an external signal.
Changeover-inhibit and changeover-request switches are provided on the front panel for local manual control.

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DDA-3312ASI/SDI Path Protection Amplifier

 

Features
  • SDI & DVB-ASI compliant.
  • Adaptive cable input equalisation.
  • Data regeneration.
  • Polarity alarm and inversion capability for ASI.
  • Protection switching capability.
  • Power fail signal bypass.
  • External Alarms.
  • Compatible with other IRT Eurocard modules and frames

 

General

 

The DDA-3312 is a data distribution amplifier that may be used with either ASI or SMPTE SDI 270 Mb/s signals.
Four outputs are provided at the rear of the module with an additional output for monitoring purposes on the front panel. The primary output is controlled by relays to provide a bypass signal from the input during a power failure.
The DDA-3312 incorporates a protection facility for switching two outputs to signals from a companion DDA-3312 when a fault is detected.

In SDI mode a loss of input or EAV is used to indicate failure.
In ASI mode a loss of input or absence of 188/204 byte packet sync is used.
In both modes an overriding changeover request may be made either locally or by remote control.

Indicators are provided on the front panel for:

SDI signal detected
ASI signal detected
ASI signal inverted
Data loss
Module in service
Module in standby

External alarm signals are also available on the rear of the module.
Changeover-inhibit and changeover-request switches are provided on the front panel for use where modules are linked in pairs for redundancy.
For this configuration, a special double width rear assembly (type ZDA-4311RH) is required to link the signal and logic sections of two modules

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ZDA-4311RH Handshake connection -  ASI / SDI Data Amplifiers

Features
  • Redundant pair operation.
  • Protection switching facility.
  • External alarms from each module.
  • One output bypass on power loss.

General

The DDA-3312 is an ASI / SDI data distribution amplifier that incorporates a protection switching facility for the switching in of signals from a standby module when a fault is detected.
To facilitate this mode of operation, the ZDA-4311RH provides all of the required signal and logic interconnections between two modules.
The individual module alarms are also provided for remote monitoring purposes.Two switched outputs are provided at the rear of the module with two additional outputs for monitoring purposes on each module. The primary output is controlled by relays to provide a bypass signal from the input during a power failure.
Changeover-inhibit and changeover-request switches are provided on the front panel for local manual control.

DDA-4301  E3/DS3 G.703 Data Distribution Amplifier

Features

  • G.703 compliant.
  • For either E3 or DS3 G.703 data rates.
  • Adaptive cable input equalisation.
  • Data regeneration.
  • Front panel monitoring facility.
  • Protection switching facility.
  • External alarms and bypass.
  • Redundant pair operation capability.
  • Optional SNMP capability.
 

The DDA-4301 is a data distribution amplifier that operates in accordance with the G.703 specification. Either E3 (34.368Mb/s) or DS3 (44.736Mb/s unframed or 44.210Mb/s framed) data rates are possible by an on board switch selector.
The DDA-4301 incorporates a protection facility for switching to signals from a standby module when a fault is detected.
Three outputs are
provided at the rear of the module with an additional output for monitoring purposes on the front panel. The primary output is controlled by relays to provide a bypass signal from the input during a power failure.

An on board switch setting allows an Alarm Indication Signal (AIS) detected in the data stream to generate a changeover request for a companion unit.

On loss of the input, the output can be set to give either no signal or an AIS signal output.

Indicators are provided on the front panel for:

DC power
Data loss
AIS detect
Module in service
Module in standby

External alarm signals are also available on the rear of the module.
Changeover-inhibit and changeover-request switches are provided on the front panel for use where modules are linked in pairs for redundancy.

For this configuration, a special double width rear assembly (type ZDA-4300RH) is available to link the signal and logic sections of two modules.

Monitoring via a simple network management protocol (SNMP) is optionally possible when fitted with a plug-in SNMP board and run in an IRT 4000 series frame fitted with SNMP capability.

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ZDA-4300RH     Handshake connection -  E3 & DS3 Mb/s Data Amplifiers

Features

  • Redundant pair operation.
  • Protection switching facility.
  • External alarms from each module.
  • One output bypass on power loss.
  • Compatible with other IRT Eurocard modules and frame

General

IRT produces a range of data distribution amplifiers that operate at the E3 (34.368Mb/s) & DS3 (44.736Mb/s) rates in accordance with G.703. All incorporate a protection switching facility for the switching in of signals from a standby module when a fault is detected.
To facilitate this mode of operation, the ZDA-4300RH provides all of the required signal and logic interconnections between two modules.
The individual module alarms are also provided for remote monitoring purposes.
Three switched outputs are provided at the rear of the module with an additional output for monitoring purposes on each front panel. The primary output is controlled by relays to provide a bypass signal from the input during a power failure.

An Alarm Indication Signal (AIS) detected in the data stream generates a changeover request for a companion unit. In addition, the module may be forced into bypass mode by an external signal.
Changeover-inhibit and changeover-request switches are provided on the front panel for local manual control

 

HDA-4521  Dual 1 In, 3 Out HD/SD Reclocking Distribution Amplifier

Features

  • 3 non inverting outputs on each amplifier.

  • Link selectable for 1 in, 6 out single distribution amplifier operation.

  • 3 Automatic reclocking of High Definition or Standard Definition digital signals.

  • Input equalisation > 100 m for HD, > 250 m for SD.

  • Automatic output muting on no input.

  • Front panel signal presence LEDs and external alarm contacts.

  • Optional plug-in SNMP monitoring module.

    General

    The HDA-4521 HD/SD dual serial digital reclocking video distribution amplifier provides the user with a single standard module to cover a wide range of distribution and monitoring functions for High Definition (HD) and/or Standard Definition (SD) digital signals. Two triple output reclocking distribution amplifiers are provided on the one card.
    As well as accepting HD or SD signals, the HDA-4521 will also accept ASI signals. To provide for the ploarity sensitive nature of ASI signals, all outputs of the HDA-4521 are in phase with the inputs.

    Serial digital signals suffer severe deterioration over relatively short cable distances. This is especially so with the HD high data rate. The HDA-4521 provides a means of extending the working distances that can be achieved by equalising and retransmitting the data mid route.

    The HDA-4521 will automatically reclock either 1.485Gb/s HD signals or lower rate 270Mb/s SD signals. Both sides of the HDA-4521 can be run independently allowing a mixture of signal types to be used.

    On board link settings allow either of the inputs to feed all outputs to create a one in, six out distribution amplifier.

    Front panel LEDs indicate when an input signal is present and whether the output is an HD or SD type.

    Separate alarm outputs switch to ground for indication of loss of input signal or loss of power.

    An optional SNMP (Simple Network Management Protocol) plug in module is available for remote monitoring and control when used in conjunction with IRT's 4000 series frame fitted with SNMP capability. Extra features are available via SNMP such as automatic switching on loss of one input to the other input.

    The HDA-4521 is designed to fit IRT's  4000 series 3RU frames for use with IRT's SNMP system as well as being suitable with IRT's 1000 series 1RU Eurocard frames and may be used alongside any other of IRT's Eurocards.

     

 

 

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