News Release

Data World

Valiant introduces its
T1 Echo Canceller solutions

November 30, 2001

Valiant's introduces its VCL-EC128, T1 128ms. Voice Echo Canceller solutions for wireless, cellular, digital circuit multiplication (DCME), satellite communications and datacomm applications.

Valiant's echo canceller is a fully integrated 24 channel echo canceller that cancels echo up to 128ms. The VCL-EC128-T1 offers disable tone detection. Each of the 24 channels cancels echoes up to 128ms and meets ITU-T G.165 and ITU-T G.168 requirements for echo cancellation. Inputs and Outputs are 100 Ohms, RJ45 E1s.

  • Signaling 24B (24 voice channels) with out-of-band signaling (C7, SS7 etc.) or 23B+D, PRI ISDN (23 voice channels + D signaling channel).
Valiant's echo canceller highlights include, providing voice echo cancellation of up to 128ms. The solution meets ITU-T G.164 and G.165 disable tone detection requirements and conforms to ITU-T G.168. The VCL-EC128-T1 elminates long echo tails.
 
Application incude:
  • Wireless: Digital Cordless, PCS, and Cellular Base Stations and Access Controllers.
  • Digital Circuit Multiplication Equipment (DCME) : Satellite Communications and Multiplexers.
  • PCS, cellular, mobile, and digital cordless wireless systems.
  • PBX and central office systems.
  • Datacomm: Voice Over Frame Relay, Voice Over ATM, and Voice Over Internet.
  • Voice over ATM, Frame Relay or packet switching systems that provide a separate channel to carry V.32/V.32bis/V.34 modem and fax transmissions.
  • Central Office and PBX: Network Trunks, Echo Canceller Pool, Common Equipment and Audio Conferencing Bridges

  • Voice over datacomm including voice over Internet (VoIP), voice over ATM (VTOA), and voice over Frame Relay (VoFR).

Key Features and Benefits:

  • 128ms echo cancellation.
  • ITU-T G.164 / G.165 Disable Tone detection supported on all audio paths
  • Non-Linear Processor with adaptive suppression threshold and comfort noise insertion
  • Programmable Double-Talk detection threshold
  • Narrow-Band signal detection
  • Selectable / A-Law ITU-T G.711; / A-Law Sign Magnitude; linear 2's complement
  • Ideally suited to handle most echo situations.
  • Assures operability with V.32/V.32bis/V.34 modem and fax transmissions. Conforms to standards assuring proper public network operation and facilitating system integration.
  • Removes residual echo and minimizes switching effects thereby providing high perceived speech quality.
  • Ensure echo canceller maintains excellent performance at all times in the presence of non-echo voice signals.
  • Useful for trunks that have very low echo-returns loss.
  • Ensure echo canceller maintains excellent performance at all times in presence of tones or signals including DTMF tones.

  • Usable in telecommunications systems worldwide. Able to interface in most systems where linear samples are available.

Valiant Communications Limited manufactures a wide range of telecom transmission solutions including multiplexers, DCME voice compression equipment, PRI ISDN solutions, channel banks, T1 to E1 converters, E1 WAN Access multiplexer, Fiber Optic Transmission solutions, digital access cross connects, digital circuit multiplication equipment and digital loop carrier equipment.

Valiant's international offices, distributors and representatives are located in U.S.A., Canada, United Kingdom, Mexico, Hong Kong, Korea, Indonesia, Thailand, Argentina, Uruguay, Honduras, El-Salvador, Netherlands Antilles, South Africa, Saudi Arabia, Kuwait, U.A.E., Jordan, Yemen, Syria and Bangladesh.
 
For additional information please contact:
E-mail: Contact Us

Sales Department:
Valiant Communications Limited
Address: 71/1, Shivaji Marg,
New Delhi - 110015, India
Phone: +91-11-41055601, 41055602, 41055603
Fax: +91-11-41055604, 25434300
Web Site: http://www.valiantcom.com
 
VCL-EC128 is a Trademark of Valiant Communications Limited.
VCL-LD is a trademark of Valiant Communications Limited.
VCL-TRLD is a trademark of Valiant Communications Limited.
All respective trademarks are the ownership of their respective owners.
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