E1 & T1 Voice Compression

Aries VCL-LD, E1 DCME (Digital Circuit Multiplication Equipment) Voice Compression Equipment provides 30, "toll quality" voice channels using an 8:1 compression ratio, (10:1 without signaling channel) in a bandwidth of 256kbps.

Also available with fax and data modem support @ 33.6Kbps data rates. This is accomplished using an advanced digital signal processor (DSP) based Virterbi decoder with automatic voice/silence detection (VAD) and adaptive comfort noise generation (CNG).

The interface to the local PSTN network is ITU-T G.703, G.704 compliant E1 with signalling support for R2, CAS (ABCD) Digital Signalling, PRI ISDN (Q.931), SS7 and C7 Signalling.

E1, VCL-LD is a natural choice for satellite communications, digital mobile radio applications, cellular network operators, long distance telephony service providers (including pre-paid calling card operators), corporate customers, call-center operators wanting to optimize on expensive bandwidth usage and offer a competitively priced, toll-quality service to their customers. The VCL-LD, E1 DCME is equipped with a 128ms. E1 Echo Canceller (E1 echo cancellation card) which conforms to ITU-T G.165 and ITU-T G.168. Voice compression technology has been proven to outperform CELP, RELP, VSELP, MELP, ECELP, MP-MLQ, LPC-10 and other competitive technologies. Numerous evaluations have shown its ability to provide performance equal to today's digital cellular systems at under half the data rate. The Voice Activation Detection (VAD) algorithm along with the Comfort Noise Insertion (CNI) performs useful functions in systems trying to convert periods of silence, that exist in normal conversation, to savings in system bandwidth. The comfort noise is intend to give the listener the feeling that the call is still connected as, opposed to producing absolute silence which can give the impression that the call has been dropped.

Applications

Satellite Communications
Digital Mobile Radio
Cellular Telephony and PCS
Voice Multiplexing
Secure Communications

Long Distance Telephony
Prepaid Calling Card Service
Call Center Applications
Rural Telephony
Multimedia Application

Voice Quality statement for the E1, VCL-LD equipment using 8:1 compression ratio (10:1 without signaling channel) for providing better voice quality than G.729, G.726 and GSM technology. VCL-LD is a natural choice for long distance telephony service providers (including pre-paid calling card operators), cellular operators, corporate customers, call-center operators wanting to optimize on expensive bandwidth usage and offer a competitively priced, toll-quality service to their customers.

Features

Support for multiple signaling platforms including CAS R2, PRI ISDN, SS7 and C7 signaling.
Echo cancellation: Echo canceller card cancels echo up to 128ms. E1, 30 voice channels in 256Kbps bandwidth (4, DS-0's for voice only applications.
E1, 30 voice channels in 384Kbps bandwidth (6, DS-0's for voice, fax and data modem support applications.
Ideal choice for satellite communications, digital mobile radios, cellular network, long distance telephony (including pre-paid calling card operators), corporate customers for linking intercity voice networks, national and international call-center applications, and ISPs wishing to provide reliable long distance telephony services.
Transport over point-to-point satellite links and dedicated leased lines.
Minimal algorithmic processing delay.
DTMF detection and regeneration.
Scalable - Build as you grow.
Highlights
Superior Voice Quality.
E1, 30 Toll-Quality voice channels in 256Kbps of bandwidth.
8:1 compression ratio (10:1 without signaling channel).
128 ms. adaptive Echo Cancellation.
Supports fax and data modems @ up to 33.6Kbps data rates.
DSP based Vertibi Decoder for superior voice quality.
3U high, compact construction.
Extensive set of alarms.
User selectable clock sources.
Forward Error Correction.
Robust to Bit Errors & Background Noise.
High Quality Low Data Rate Speech Coding.
Voice Activity Detection (VAD) / Comfort Noise Insertion.
Single and Dual Tone (DTMF) Detection and Generation.
Modular Architecture - reduces downtime - dual port per card.
Related Links:
E1 DCME Voice Comprssion - Product Brochure (PDF)
E1 DCME Voice Comprssion - PowerPoint Presentation
E1 DCME Voice Comprssion - Technical Specifications
E1 DCME Voice Comprssion - Ordering Information

Aries Telecom
10842, N 127th Place
Scottsdale, AZ 85259, U.S.A.
Phone: 1-480-816-8672 Fax: 1-480-451-6693
E-mail: info@ariestelecom.com
Website: http://www.ariestelecom.com

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