T1 Echo Canceller - Highlights

• Provides voice echo cancellation of up to 128ms Uni-Directional.
• 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.
  • SLC-96 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 per T1 port.

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 and SLC-96 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).

Related Links

• Echo Canceller solutions - Home Page