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PRODUCT OVERVIEW
 T1,
DCME (Digital Circuit Multiplication Equipment) Voice Compression Equipment provides 24,
"toll quality" voice channels using an 6:1 compression ratio (8:1 Compression
Ratio without the signaling channel), in a bandwidth of 256kbps. 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 T1 with signaling support for PRI ISDN (Q.931), SS7 / C7 ,
Common Channel Signaling.
T1, DCME 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.
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
- Secure Communications
- Cellular Telephony and PCS
- Voice Multiplexing
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- Voice Mail
- Long Distance Telephony
- Prepaid Calling Card Service
- Call Center Applications
- Rural Telephony
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Features |
Highlights |
- Support for multiple signaling platforms including CAS R2,
PRI ISDN and SS7 Signaling.
- Echo cancellation: Echo canceller card cancels echo up to
128ms.
- T1, 24 voice channels in 256Kbps bandwidth (4, DS-0's :-
includes signalling channel @ 64Kbps)
- Ideal choice for satellite communications, digital mobile
radios, cellular network, long distance telephony service providers (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 service to their customers.
- Modular Architecture - reduces downtime - dual port per
card.
- Scalable - Build as you grow.
- Transport over point-to-point satellite links and dedicated
leased lines.
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- T1, 24 Toll-Quality voice channels in 256Kbps of bandwidth.
- 6:1 compression ratio (8:1 without signaling channel).
- 128 ms. adaptive Echo Cancellation.
- DSP based Vertibi Decoder for superior voice quality.
- 3U high, compact construction.
- Extensive set of alarms.
- User selectable clock sources.
- Forward Error Correction.
- Superior Voice Quality.
- 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.
- Minimal algorithmic processing delay.
- DTMF detection and regeneration.
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T1 DCME (Digital Circuit
Multiplication Equipment)
SHELF DESCRIPTION:
T1 DCME (Digital Circuit Multiplication Equipment) is a
3U, 19 Inch Shelf, fitted with a backplane that provides rear access of all external
interfaces. The T1 interface, power input, alarm extention are all accessed from the
backplane.
T1 DCME (Digital Circuit
Multiplication Equipment)
Front View of the Shelf
| Front View (Left to
Right) |
Card Details |
Part No. |
| Slot 1: |
PS, Power Supply Card |
LD-110 |
| Slot 2 to Slot 5: |
VCC, Voice Compression Card |
LD-220 |
| Slot 6: |
DS-0, DS-0 Card |
LD-230 |
| Slot 7 to Slot 10: |
VCC, Voice Compression Card |
LD-220 |
| Slot11: |
DS-0, DS-0 Card |
LD-230 |
| Slot1 to Slot15: |
VCC, Voice Compression Card |
LD-220 |
| Slot 16: |
DS-0, DS-0 Card |
LD-230 |
| Slot 17: |
VCE, T1 Interface Card |
LD-240 |
| Slot 18: |
EC, Echo Canceller
Card
(128ms Echo Cancellation) |
EC128-T1 |
Applications
Diagrams: (PDF)
Related Links
T1, Digital Voice Compression Equipment -
Technical Specification
T1, Digital Voice Compression
Equipment - Product Brochure (PDF)
E1, Digital Voice Compression Equipment -
Technical Specifications
E1, Digital Voice Compression Equipment -
Product Brochure (PDF)
E1, Analog Voice Compression (DCME)
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