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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. .
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