We offer the following E1/T1/DS3 echo canceller solutions.

The echo canceller solutions offers carrier-grade voice quality per AT&T Voice Quality Assessment Lab. The echo canceller supports fax / modem G.164 and G.165 (2100 Hz) tone disable function.

• E1 echo canceller - 19 inch rack 1 U version with telnet
• E1 echo canceller - Desktop (modem type version)
• E1 Echo Canceller - Technical Specifications
• DS3 echo cancellers
• E1 Echo Cancellers Data Sheet
• Product Presentation PPS

Signaling Support

The E1 echo cancellers supports the following signaling protocols:

• 30B+D PRI ISDN (Euro ISDN) signaling
• 31B (31 voice channels) with out-of-band signaling
• R2 CAS Signaling
• SS7 signaling (on any user selected time-slot)
• All signaling options are USER SELECTABLE / USER CONFIGURABLE.

Fault Recovery

The echo canceller equipment offers fault recovery feature. It offers automatic by-pass upon power-supply failure / removal power supply. (i.e. it offers E1 circuit by-pass in the event of power supply failure).

E1 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:
  • 30B+D PRI ISDN (Euro ISDN) signaling,
  • 31B (31 voice channels) with out-of-band signaling,
  • R2 CAS Signaling,
  • SS7 signaling (on any user selected time-slot).
  • All signaling options are USER SELECTABLE/USER PROGRAMMABLE.
• 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.
• Offers RS232 serial interface for external PC CPM port and Ethernet (10Base-T) interface for remote LAN
• Adjustable Gain/loss settings on all channels. Provides the user the flexibility to adjust and optimize the voice and transmit receive levels
• Non-Linear Processor with Comfort Noise Insertion
• Redundant Power Supply (Optional)
• E1 Circuit by-pass on power failure
• Automatic by-pass upon power supply failure/removal of power supply.
• Option for user to select data or voice channels 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 30-channel voice echo canceller

Types of E1 Echo Cancellers offered:

64ms Bi-directional and 128ms. Uni-directional E1 echo cancellers - User Selectable. Our E1 echo canceller is a fully integrated 30 channel echo canceller that cancels echo up to 64ms. bi-directional/128ms. uni-directional - User Selectable. E1 Inputs and Outputs are balanced 120 Ohms, RJ-45.

Redundancy

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

Remote Monitoring and Control

The equipment offers RS232 serial interface for configuration through a PC COM Port, and an Ethernet (10BaseT) interface for remote LAN configuration and monitoring which allows the user to monitor and configure the equipment over a TCP-IP network from anywhere in the world.

Unique E1 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 E1 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 E1 connections on the echo-canceller card.

USER PROGRAMMABLE Signaling Option. Our echo-cancellers provide USER PROGRAMMABLE E1 signaling options whereby the user may use our E1 echo-cancellers just as efficiently over a wide spectrum of E1 signaling options. The E1 signaling protocols that we support are 30B+D PRI ISDN (Euro ISDN) signaling, 31B (31 voice channels) with out-of-band signaling, R2 CAS Signaling, SS7 signaling (on any user selected time-slot). All signaling options are USER SELECTABLE.

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 E1 echo canceller supports 2100 Hz fax / analog data modem tone detection and echo canceller disabling on all channels. For dedicated digital data or video channels, if you wish to assign certain specific times-slots of the E1 circuit for dedicated video you may do so, using our E1 echo cancellers. Our E1 echo-cancellers allow the USER to PROGRAM / ASSIGN dedicated time-slots for digital data or video transmission. The USER may specify / define the dedicated data channels so that they are ALWAYS BY-PASSED from the echo-cancellation circuitry - leaving those dedicated time-slots for digital data communication / dedicated video transmission only.

Applications for the E1 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 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)

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

E1 Echo Canceller Features and Highlights

• User Selectable - 128ms - Uni-directional or 64ms - Bi-directional. The user selection is made through a user configurable software interface command
• Compliant to ITU-T G.164, G.165, G.168 2000, G.168 2002) requirements
• Carrier-grade voice quality per AT&T Voice Quality Assessment Lab
• Fax / Modem G.164, G.165 - 2100 Hz tone disable as per ITU-T G.164/G.165 Recommendations. Allows fax and analog modem data transmission through automatic echo- cancellation enable / disable function
• Disable Tone detection supported on all audio paths
• Fully integrated independent 30-channel voice echo canceller
• Option for user to select data or voice channels 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
• E1 Circuit by-pass in event of power supply failure. This feature enables the by-pass of the E1 Circuit in the event of power failure. This ensure continues signal even if the power to the echo-canceller fails
• E1 Circuit by-pass on power failure
• E1 Circuit by-pass on Echo Canceller card removed. This feature allows the USER to by-pass the E1 Circuit by simply removing the echo-canceller card. E1 circuit connects "through" as soon as echo-canceller is removed from its slot
• Non-Linear Processor with adaptive suppression threshold and comfort noise insertion.
• Programmable Double-Talk detection threshold
• Narrow-Band signal detection
• Adjustable Gain / loss settings on all channels. Provides the user the flexibility to adjust and optimize the voice and transmit receive levels
• Signaling Support:
  • 30B+D PRI ISDN (Euro ISDN) signaling
  • 31B (31 voice channels) with out-of-band signaling
  • R2 CAS Signaling
  • SS7 signaling (on any user selected time-slot)
  • All signaling options are USER SELECTABLE / USER CONFIGURABLE
• Redundant Power Supply (Optional)
• Non-Linear Processor with Comfort Noise Insertion
• TCP / IP remote access for remote configuration and control.
• 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. Unique design provides the industry's best sounding single chip echo canceller
• 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
• Instability detector suppresses variable pitched ringing or oscillation
• Path change detect permits fast re-convergence when a major change occurs in the echo channel
• User selectable tail-end side. This feature allows the USER to select the "Tail-End" side of the Echo-Canceller. The "Tail-End" side of Echo-Canceller is that part of the network which generates / causes to generate the Echo. Uni-directional Echo-Cancellers MUST ALWAYS be installed on far-end of any network from the point at which an Echo is being heard. The "Tail-End" side MUST ALWAYS face the "Source Side" of the network which is generating the echo. Ideally suited to handle most echo situations.
• Usable in telecommunications systems worldwide. Able to interface in most systems where linear samples are available.

Application Diagrams for the E1 Voice Echo Cancellers

 

Application Diagrams

Application 1 Application 2 Application 3 Application 4 Application 5

Others Links:

  VoIP SS7 and C7 Solution
  E1 VOIP-GSM Gateway
  GSM Gateways / GSM Channel Banks
  Echo Cancellers
  Digital Access Cross Connect Switch (DACS)
  Groomers (Hi-Z Non-Instrusive Monitoring)
  Multiplexers

Technical specifications are subject to change without notice.
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