Aries Telecom - T1 Echo Canceller, Signalling Support with PRI ISDN SS7 and C7 Signalling protocol

Product Overview

VCL-EC128-T1, Voice Echo Canceller is a fully integrated 24-channel echo canceller that cancels echo of up to 128ms. Each of the 24 channels cancels echoes up to 128ms. with disable tone detection and meets ITU-T G.165 and ITU-T G.168 requirements for echo cancellation. T1 Inputs and T1 Outputs are balanced 100 Ohms, RJ-45.

Types of T1 Echo Cancellers offered

64ms. - Uni-directional - cancels the echo with upto 64ms. tail at the far end
128ms. - Uni-directional - cancels the echo with upto 128ms. tail at the far end
64ms. - Bi-directional - cancels the echo with upto 64ms. tail in both direction
Signaling for the T1 Echo Cancellers
24B (24 voice channels) with out-of-band signaling (C7, SS7 etc.)
23B+D, PRI ISDN (23 voice channels + D signaling channel)

T1, VCL-EC128, Voice Echo Canceller - Highlights

Provides voice echo cancellation of up to 128ms.
Meets ITU-T G.164 and G.165 disable tone detection requirements.
Non-Linear Processor with Comfort Noise Insertion
Conforms to ITU-T G.164, G.165, G.168 recommendations

Narrow-Band Detector
Fully integrated independent 24 channel voice Echo Canceller
Eliminates long echo tails

Applications for the VCL-EC128-T1

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).

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

Wireless Applications

Digital Cordless and Cellular Basestations
Access Controllers

Satallite Communications Applications

Digital Circuit Multiplication Equipment DCME)

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.

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 / ľ Law ITU-T G.711; / ľ 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.