Dual Redundancy

ASL VIPEDIA and V2000 PAVA systems already provide improved redundancy and reliability in excess of requirements of EN54, particularly through the use of ‘hardware bypass’, so what is ‘Dual Redundancy’ and why should you use it?

Overview

VIPEDIA routers and V2000 amplifier frames offer a combination of IP digital and analogue audio interfaces. With each interface utilised in the most appropriate manner, improved system redundancy can be provided by using:

 

Reference Example

This basic system reference example is for illustrative and cost comparison purposes:

Single VIPEDIA and V2000 System

Using single outputs from a microphone console driving a VIPEDIA and V2000 system the V2000 amplifier frame has a standby amplifier built in to automatically take over from failure of a live amplifier. This solution is fully compliant with BS5839pt8 and EN54 and can be configured to be EN60849 compliant if required. If the VIPEDIA should fail the system defaults to ‘Hardware ByPass’ status allowing for all-call paging.

For simplicity the dual output microphone has been omitted from the diagram.

Failure Type:

Automatic Substitute From:

Degradation Performance:

Time for Substitution:

Amplifier

Spare Amplifier in FrameNone<3s from fault confirm

Mains

BatteryNoneInstant

Battery / 2nd PSU

MainsNoneInstant

Amplifier Frame

NoneLoss of all audioN/A

VIPEDIA

NoneAll Call Only<3s from fault confirm

Compliance Standard

BS5839pt8EN54EN60849

System Example 1

Here we highlight a system example with A/B Dual Redundancy built in.

 A/B VIPEDIA System

Using dual outputs from the microphone consoles to drive two independent voice alarms systems using A / B systems of VIPEDIA router and V2000 amplifier frames with standby amplifiers installed in each of the V2000 amplifier frames.

The cost of this system is 100% additional cost versus the reference example indicated above.

Failure Type:

Automatic Substitute From:

Degradation Performance:

Time for Substitution:

Amplifier

Spare Amplifier in FrameNone<3s from fault confirm

Mains

BatteryNoneInstant

Battery / 2nd PSU

MainsNoneInstant

Amplifier Frame

NoneLoss of 3dB in ZoneN/A

VIPEDIA

NoneLoss of 3dB in ZoneN/A

Compliance Standard

BS5839pt8EN54EN60849

System Example 2

This highlights a system example with Dual ‘Hot Swap’ VIPEDIA’s built in.

Dual ‘Hot Swap’ VIPEDIA System

Instead of mirroring completely, as in the system example  above, the Dual ‘Hot-Swap’ VIPEDA example uses two VIPEDIA routers running simultaneously with outputs from VIPEDIA-A. The RCB01 between the two VIPEDIA routers monitors functionality and is capable of passing control of the system between both VIPEDIA routers in the event of failure.

For simplicity the dual output microphone has been omitted from the diagram.

The cost of this system is 60% additional cost versus the reference example indicated above.

Failure Type:

Automatic Substitute From:

Degradation Performance:

Time for Substitution:

Amplifier

Spare Amplifier in FrameNone<3s from fault confirm

Mains

BatteryNoneInstant

Battery / 2nd PSU

MainsNoneInstant

Amplifier Frame

NoneLoss of AudioN/A

VIPEDIA

Standby VIPEDIANone<3s from fault confirm

Compliance Standard

BS5839pt8 (type5)EN54EN60849

System Example 3

This example  is with Dual ‘Hot Swap’ VIPEDIA’s and Dual  V2000 Amplifier Frames.

Dual ‘Hot Swap’ VIPEDIA System & Dual V2000 Amplifier Frames

This system uses two VIPEDIA routers running simultaneously with outputs from VIPEDIA-A. As in the example above the RCB01 between the two VIPEDIA routers monitors functionality and is capable of passing control of the system between both VIPEDIA routers in the event of failure. Furthermore there are dual V2000 amplifier frames providing outputs for both ‘A’ and ‘B’ amplifier legs, coupled through an RSS01 co-joining outputs from the V2000 amplifier frames.

For simplicity the dual output microphone has been omitted from the diagram.

The cost of this system represents 125% additional cost versus the reference example indicated above.

Failure Type:

Automatic Substitute From:

Degradation Performance:

Time for Substitution:

Amplifier

Spare Amplifier in FrameNone<3s from fault confirm

Mains

BatteryNoneInstant

Battery / 2nd PSU

MainsNoneInstant

Amplifier Frame

Standby V2000None<3s from fault confirm

VIPEDIA

Standby VIPEDIANone<3s from fault confirm

Compliance Standard

BS5839pt8 (type5)EN54EN60849

Summary

It is important to understand that ASL systems comprising of one VIPEDIA router and one V2000 amplifier frame loaded with amplifier modules fully meets the requirements of EN54 and BS5839pt8. These systems have been manufactured to highest reliability standards and in London Underground this implementation has proven to be totally reliable.

In some applications and to meet other regulations (particularly for Oil and Gas platforms), increased redundancy of systems is required.

System Example 1 shows a true A/B dual system as deployed on oil platforms. The most degraded single failure is the loss of 3dB SPL in all zones as one of the dual systems fails completely – this assumes that loudspeakers are installed in an interleaved fashion. This solution effectively doubles the equipment costs.

System Example 2 shows a dual Vipedia router system driving a single V2000 amplifier frame. Provided that the V2000 amplifier frame is dual powered (by mains and battery or by mains and DC PSU from UPS), there is not a single point of failure. Power rails are independently driven from two PSU’s and the amplifiers do not share any common components. This example adds an additional 60% to system costs.

System Example 3 shows a dual system with redundant Vipedia routers and V2000 amplifier frames using external controllers to ensure a fault-free controller is in use at all times. Amplifiers are again fully supported both amplifier by amplifier and frame by frame. This leads to the highest level of system redundancy, adding  approx. 125% to system costs.