MULTICOM,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).

　　MULTICOM E1 Voice Compression Equipment - Product Brochure (PDF)
　　MULTICOM E1 Voice Compression Equipment - Technical Specifications
　　MULTICOM E1 Voice Compression Equipment - Product Brochure (PPS)
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.

Also available T1, DCME (Digital Circuit Multiplication Equipment) Voice Compression Equipment

E1,MULTICOM 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 MULTICOM, 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.

DCME Voice Compression Equipment provides 24 "toll-quality" voice channels using an 6:1 compression ratio by compressing an T1 to 256Kbps (4, DS-0s) of bandwidth. Also available with fax and data modem support @ 33.6Kbps data rates. It is suitable for long-distance telephony service providers, cellular networks, pre-paid calling card operators and call-center operators. T1 signaling includes support for PRI ISDN Signaling, C7 and SS7. Equipped with 128ms. T1 echo canceller. .