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Voice Quality Enhancement

VQEST 300 Theme
  • Customisable for challenging network deployment scenarios including VoIP Gateways
  • Near and Far End Echo Cancellation
  • Exceptional Double Talk Performance
  • Dedicated per channel Processing
  • Supports advanced CODEC Technologies including EVRC
  • Spectrally accurate comfort noise generation
  • Standard and User configurable data and fax operation
"Advanced Voice Quality Enhancement with Far and Near End echo cancellation and Adaptive Noise Reduction"
VQEST300 Brochure

VQEST 300

Advanced Voice Quality Enhancement Solution for your Network

VQEST 300 is a Voice Quality Enhancement System intended for Network Operators with challenging Voice Quality problems to resolve in their Network Configurations.

The VQEST 300 solution is tailored to deliver superior voice quality in even the most challenging carrier network configurations including Wireless Local Loop, Circuit Switched PSTN, GSM/CDMA and Voice Over Packet.

The modularity of VQEST 300 allows the G.168 (2002) compliant voice quality enhancement to support up to 320 bi-directional voice channels.

Configurations include 2, 4, 6, 8 and 10 full bi-directional echo cancellation and voice enhancement on E1 or T1 interfaces.

VQEST 300 can be remotely managed and monitored using the VQEST-EM element manager.

VQEST 300 is scalable and customisable for your network context, reducing your risk in reaching your voice quality objectives.

Features
 Benefits
Far and Near End echo cancellation Bi-directional echo cancellation, removes the reliance on poor near end handset echo cancellation performance
Adaptive Noise Reduction Background noise suppression leads to more intelligible speech, and better performance from ASR and AVR systems
Acoustic Echo Control Echo scenarios for real life situations (for example, hands free) are accommodated
Field Configurable Algorithm Algorithm can be tuned to the network context, with configurable tail displacement and length
Rack Alarm Interface Simple Alarm interface, and OSS integration

Beethoven FR Topology

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Specifications Summary

Voice Quality Enhancement
Channel Capacity Configurable to up to 320 voice channels
Echo Cancellation G.168 (2002) Digital Echo Cancellation, Hybrid and Acoustic cancellation
Direction of Cancellation Uni-directional and bi-directional operation
Tail length 128ms—Hybrid echo, 512ms—Acoustic echo
Tail offset Up to 384ms
Level Control G.169 Automatic Level Control, Manual level control
Comfort Noise Spectrally correct comfort noise
Background Noise Advanced background noise reduction
Double-talk Intelligent double-talk detection
Codec Superior performance with highly non-linear codecs in the echo path
Load dependence Dedicated per channel processing resources
Environment dependence VQ performance Is independent of language and background noise

Physical, Mechanical & Power
Ambient Operating Temperature 0°C to 50°C
Power Supply Dual, redundant –48VDC, -36VDC to –64VDC operating range
Fusing 7.5A Resettable Circuit Breaker per power feed
Rack Mounting 19/23 inch rack mountable
Height 88.9mm (2U)
Width 455mm
Depth 350mm

Network Interoperability
Signalling VQEST 300 is signaling agnostic
Tone Disabler Standards compliant tone disabler, Flexible configuration for user customization (re-enable modes, timeouts etc.) improves interoperability with non-standard equipment, User-defined tones
Tandem Free Operation TFO interoperability for GSM and CDMA networks
Timing Line-derived with automatic fallback, Internal

Line Interfaces
Line Rate 2.048Mbps (E1) 1.544Mbps (T1)
Format G.703 (E1/T1)
Interface Density Up to 10 x E1/T1 interface per system

VQEST300 Hardware

Beethoven VQAS

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