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Valiant's T1 Echo Canceller solutions with signaling support for PRI ISDN, SS7, C7, D4 signaling.
 
 
 
 
 
 
T1 Echo Cancellers
Upto 10 T1 Echo Cancellers per Chassis

DescriptionT1 Echo Cancellers - upto 10 T1 Cancellers per 19 inch 3U High Chassis

Valiant offers a compact, robust and cost effective T1 echo canceller solution in 19 inch, 3U high chassis (accommodates up to 10, T1 echo cancellers per shelf). Echo cancellation on each channel is 64ms Bi-directional and 128ms. Uni-Directional echo tails - user selectable. E1 echo canceller are also offered and available.

Valiant offers echo cancellation and voice quality enhancement solutions for the following network situations:

  • Wireline
  • Wireless
  • Satellite
  • International Gateway
  • IP Gateway

The echo canceller solutions are ideal for long distance telephony, GSM, CDMA, TDMA, VoIP, satellite and radio communication applications.
 

Products

Type of T1 Echo Canceller offered - upto 10 T1 Cancellers per 19 inch 3U High Chassis

T1 echo canceller: 64ms Bi-directional and 128ms. Uni-Directional - User Selectable. Our T1 echo canceller is a fully integrated 24 channel echo canceller that cancels echo up to 64ms. bi-directional / 128ms. uni-directional - User Selectable. T1 Inputs and Outputs are balanced 100 Ohms, RJ-45.

T1 Echo Canceller - Highlights

  • Provides voice echo cancellation of up to 64ms Bi-Directional / 128ms Uni-Directional - User Selectable / User Programmable.
  • Meets ITU-T G.164, G.165, G.168 (2000 / 2002) requirements for echo cancellation.
  • Signaling protocols supported:
    • 24B (24 Voice Channels) with out-of-band signaling (C7 / SS7 Signaling on any user selected time-slot)
    • 23B+D, PRI ISDN (23 Voice Channels+D Signaling Channel),
    • Robbed Bit Signaling.
    • All signaling options are User Selectable / User Configurable.
  • Allows digital data transmission on user-selected time-slots
  • The echo canceller supports fax / modem G.164 and G.165 (2100 Hz) tone disable.
  • Carrier-grade voice quality per AT&T Voice Quality Assessment Lab.
  • Remote access through telnet over LAN / TCP-IP link (10/100BaseT)
  • Local access through COM port (RS232 serial port)
  • Easy to use text based CLI commands for management and configuration
  • Adjustable gain / loss settings on all channels. Provides the user the flexibility to adjust and optimize the voice, transmit and receive levels
  • Non-Linear Processor with Comfort Noise Insertion
  • Redundant Power Supply (Optional)
  • T1 link by-pass on power failure. This feature helps to maintain the link integrity even in the event of power failure
  • Automatic T1 link by-pass upon removal of power supply
  • Option for user to select voice echo cancellation or digital-data transmission selectively on each time-slot for selective echo cancellation. This feature allows the user to use selected time-slots for data transmission to enable digital data / CCS signaling transmission
  • Transmission (data mode), while keeping the echo cancellation "ON" on the remaining time-slots (voice mode), on which echo is required to be cancelled.
  • Ensure echo canceller maintains excellent performance at all times in presence of tones or signals including DTMF tones.
  • Fully integrated independent 24-channel voice echo canceller

Signaling Support

The T1 echo cancellers supports the following signaling protocols supported: 24B (24 Voice Channels) with out-of-band signaling (C7 / SS7 Signaling on any user selected time-slot) 23B+D, PRI ISDN (23 Voice Channels+D Signaling Channel), Robbed Bit Signaling. All signaling options are User Selectable / User Programmable. Allows digital data transmission on user-selected time-slots.

Fault Recovery

The echo canceller equipment offers fault recovery feature. It offers automatic by-pass upon power-supply failure (i.e. it offers T1 circuit by-pass in the event of power supply failure).

Remote Monitoring and Control

  • Remote access through telnet over LAN / TCP-IP link (10/100BaseT)
  • Local access through COM port (RS232 serial port)

Redundancy

The echo canceller is equipped to offer redundant power supply (optional).

Unique T1 Echo Canceller Features

USER PROGRAMMABLE TAIL-SIDE: Echo cancellers are always required to be installed, such that, the tail-side of the echo-canceller always faces towards the source of the echo. Our T1 echo-cancellers have a User Configurable tail-side so that the USER may remotely change the direction of the tail-side of the echo canceller - without having to physically change the T1 connections on the echo-canceller card.

USER PROGRAMMABLE SIGNALING OPTION: Our T1 echo-cancellers provide User Programmable T1 signaling options whereby the user may use our T1 echo-cancellers just as efficiently over a wide spectrum of T1 signaling options. The T1 signaling protocols that we support are 24B (24 Voice Channels) with out-of-band signaling (C7 / SS7 Signaling on any user selected time-slot) 23B+D, PRI ISDN (23 Voice Channels+D Signaling Channel), Robbed Bit Signaling. All signaling options are User Selectable / User Programmable. Allows digital data transmission on user-selected time-slots.

USER PROGRAMMABLE DEDICATED DATA CHANNELS: The User my specify / define the dedicated data channels so that they are ALWAYS and COMPLETELY BYPASSED from the echo-cancellation circuitry - leaving those specifically assigned dedicated time-slots for digital data transmission (including video transmission).

The T1 echo canceller supports 2100 Hz fax / analog data modem tone detection and echo canceller disabling on all channels.

Applications for the T1 Echo Cancellers

  • Wireless: GSM, CDMA, TDMA, PCS, and Cellular Base Stations.
  • 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 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 (VoATM), and voice over Frame Relay (VoFR).

Datacomm Applications

  • Voice Over Frame Relay
  • Voice Over ATM
  • Voice Over Internet / LAN

Central Office and PBX Applications

  • Network Trunks
  • Echo Canceller Pool
  • Common Equipment
  • Audio Conferencing Bridges

Voice Over ATM Applications

  • A multi-channel echo canceller resource or pool is shared among many channels to reduce cost
  • Echo cancellation is done at a DS0 level

Satellite Communications Applications

  • Digital Circuit Multiplication Equipment (DCME)

Wireless Applications

  • GSM, CDMA, TDMA
  • Digital Cordless and Cellular Basestations

Voice Over Frame Relay, ATM Applications

  • Frame Relay and ATM routers and switches introduce large, variable, and unpredictable delays.
  • Echoes from the Public Switched Telephone Network (PSTN) in combination with the delays from Frame Relay and ATM equipment yield objectionable speech quality.

Application Diagrams for the T1 Voice Echo Cancellers

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