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DCME-6(Digital
Circuit Multiple Equipment) |
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DCME-6 applies ITU-T G.763
standard <Digital Circuit Multiple Equipment with ADPCM £¨ITU-T
G.726£© and Digital Speech Interpolation>
DCME-6 refers to the standard of the telecommunication industry----YD/T
829-1996<Technical Requirements on DCME(Voice compression
Equipment) used in Domestic Satellite Digital Telecommunication
Networks> |
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Summary of DCME-6
DCME £¨Digital Circuit Multiplication Equipment,Voice compression
Equipment£© integrates DSI, VBR, LRE technologies and any other
effective transmission technologies to highly multiply the traffic
capacity of digital circuits. DCME-6, as shown, is one of Multicom
products. Its technological core comes from the project of the
former Ministry of Posts & Telecommunications (MPT). The
project, "5-8 multiple Digital Circuit Multiplication Equipment£¨DCME-6£©",
is developed by NUPT. With the painstaking effort of many technological
experts in the field of multiplication technology in the researching,
testing and modifying and the long-term application in telecommunication
networks, the product has been proved to be of technical advantages
and steady performance as the only kind of product that can
replace imported like products, widely used in many areas of
the domestic telecommunication networks.
Main Features of DCME-6
 Better
than overseas like equipments in complying with the ITU-T
recommendation G.763£¨1994/1998£© and many other
performances.
The
Digital Speech Interpolation £¨DSI£© and Variable Bit Rate
£¨VBR£©ADPCM
40/32/24/16kbps code compression technology is employed.
FAX
and Modem voice-band data are automatically discriminated and
the 40kbps
ADPCM coding is dynamically distributed for them. The
voice-band data rate can reach 12kbps.
By way
of point-to-point operation, as much as six 2Mb/s-trunk group
signals £¨186 circuits£© can be compressed into one 2Mb/s-bearer
channels for transmission.
Low
absolute time delay£º the absolute end to end time delay of
the improved DCME-6 terminal is less than 9.2ms.
High
Robustness£º The Golay(23,12) Error-correction coding is
employed in Control Channel (CC). The measures such as
periodically forced updating to connection message and
signaling message are employed. Even if high bit error rate
occurs (close to 10-3), the product can insure the dynamic
connection.
Low
power consumption£º average terminal power consumption
<28 W, average switch over matrix (SOM) sub-shelf <8 W
High
integration level and small size.
Application of DCME-6
DCME-6 is connected to both sides of the 2Mb/s bearer
transmission link, enlarging the conventional 2Mb/s link
circuit capacity by 4-6 times by means of the complicated
signal compression coding and channel dynamic distribution
without changing the existing load group coding speed and
shape, G.703 inlet and G.704 transmission control protocol on
TSO. It is thus widely used in the satellite IDR,
single-determination TDMA satellite link circuit, digital
microwave and digital UHF link circuit, digital cable and
optical fiber stress router and many combined long-distance or
short-distance digital link circuits.
DCME-6 is applicable for telephone, voice-band data, signaling
message and some transparent data link circuit.
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DCME-6 users include£º
GSM
and imitation mobile phone provider
Exclusive /hired network telecom provider
Wireless channel expansion of the public network
Other
network providers
Extension of the public network, exclusive network or other
emergency circuits
Powerful network management system
The network management system of the PC monitoring workstation
with Chinese image interface is powerful and easy to learn and
use. Each PC can monitor 8 near-end DCME units and 8 far-end DCME
units with an average of 8£«1 DCME terminals to return to
stand-by devices. And the far-end monitoring message transfer
adopts the domestic bit in the load group TS0.
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Main interface of the
network management system |
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Configuration
interface |
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Difference between DCME
and Transcoder
¡úDCME integrates DSI, VBR, LRE
technologies and other effective transmission technologies to
distinguish and dynamically distribute the transmission
channels to meet different needs (data or voice, transparent
of exclusive) , which ensures multiple transmission efficiency
and high quality. e.g. DCME-6 distributes ADPCM 40Kbps to the
voice-band data, 32/24/16Kbps variable to voice, which
guarantees multiple voice compression and voice-band data
speed up to 12kbps.
¡úThe transcoder adopts the
simplex LRE technology in the circuit distribution. Idle
circuits also have a coverage, which leads to relatively low
multiplication rate and weak data transmission. When a 64KB/S
data circuit £¨such as 7# signal message£© is installed,
several lines in the way must be blocked up. .
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Copyright @2001-2007 Guangdong
Multiplication Communication Co., Ltd. |
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