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Product Overview
Bhumika provides robust and
cost effective T1 and E1 echo canceller and voice quality enhancement
solutions for the long distance, wireline, wireless, (GSM, CDMA, TDMA),
VoIP, satellite and radio communications. The VCL-EC, T1 echo cancellers
are offered to
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provide cancellation of 64ms / 128ms (user
selectable) echo tails. The echo canceller equipment is compliant to ITU-T
G.164, G.165, G.168 (2000 / 2002) requirements for echo cancellation.
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Bhumika offer the following
T1 / E1 / DS3 echo canceller solutions.
The echo canceller solutions
offers carrier-grade voice quality per AT&T Voice Quality Assessment
Lab.
The echo canceller supports
fax / modem G.164 and G.165 (2100 Hz) tone disable function.
Signaling Support
The T1 echo cancellers
supports the following signaling protocols supported: 24B (24 Voice
Channels) with out-of-band signaling (C7 / SS7 Signaling on any user
selected time-slot) 23B+D, PRI ISDN (23 Voice Channels+D Signaling
Channel), Robbed Bit Signaling. All signaling options are USER
SELECTABLE / USER CONFIGURABLE.
Fault Recovery
The echo canceller equipment
offers fault recovery feature. It offers automatic by-pass upon
power-supply failure / removal power supply. (i.e. it offers T1 circuit
by-pass in the event of power supply failure).
T1 Echo Canceller - Highlights
- Provides voice echo cancellation of up
to 64ms Bi-Directional / 128ms Uni-Directional - User Selectable /
User Programmable.
- Meets ITU-T G.164, G.165, G.168 (2000
/ 2002) requirements for echo cancellation.
- Signaling protocols supported: 24B (24
Voice Channels) with out-of-band signaling (C7 / SS7 Signaling on any
user selected time-slot) 23B+D, PRI ISDN (23 Voice Channels+D
Signaling Channel), Robbed Bit Signaling. All signaling options are
USER SELECTABLE / USER CONFIGURABLE.
- The echo canceller supports fax /
modem G.164 and G.165 (2100 Hz) tone disable.
- Carrier-grade voice quality per AT&T
Voice Quality Assessment Lab.
- Offers RS232 serial interface for
external PC CPM port and Ethernet (10Base-T) interface for remote LAN
- Adjustable Gain/loss settings on all
channels. Provides the user the flexibility to adjust and optimize the
voice and transmit receive levels
- Non-Linear Processor with Comfort
Noise Insertion
- Redundant Power Supply (Optional)
- T1 Circuit by-pass on power failure
- Automatic by-pass upon power supply
failure / removal of power supply.
- Option for user to select data or
voice channels for selective echo cancellation. This feature allows
the user to use selected time-slots for data transmission to enable
digital data / CCS signaling transmission.
- Transmission (data mode), while
keeping the echo cancellation "ON" on the remaining time-slots (voice
mode), on which echo is required to be cancelled.
- Ensure echo canceller maintains
excellent performance at all times in presence of tones or signals
including DTMF tones.
- Fully integrated independent
30-channel voice echo canceller
Types of T1
Echo Cancellers offered:
- 64ms Bi-directional and 128ms. Uni-Directional
T1 echo cancellers - User Selectable. Our T1 echo canceller is a fully
integrated 24 channel echo canceller that cancels echo up to 64ms.
bi-directional / 128ms. uni-directional - User Selectable. T1 Inputs
and Outputs are balanced 120 Ohms, RJ-45
Redundancy
The echo canceller is
equipped to offer redundant power supply (optional).
Remote Monitoring and
Control
The equipment offers RS232
serial interface for configuration through a PC COM Port, and an
Ethernet (10BaseT) interface for remote LAN configuration and monitoring
which allows the user to monitor and configure the equipment over a
TCP-IP network from anywhere in the world.
Unique E1 Echo Canceller
Features
USER PROGRAMMABLE tail-side. Echo
cancellers are always required to be installed, such that, the tail-side
of the echo-canceller always faces towards the source of the echo. Our
T1 echo-cancellers have a USER CONFIGURABLE tail-side so that the USER
may remotely change the direction of the tail-side of the echo canceller
- without having to physically change the T1 connections on the
echo-canceller card.
USER PROGRAMMABLE Signaling Option.
Our echo-cancellers provide USER ROGRAMMABLE T1 signaling options
whereby the user may use our T1 echo-cancellers just as efficiently over
a wide spectrum of T1 signaling options. The T1 signaling protocols that
we support are 24B (24 Voice Channels) with out-of-band signaling (C7 /
SS7 Signaling on any user selected time-slot) 23B+D, PRI ISDN (23 Voice
Channels+D Signaling Channel), Robbed Bit Signaling. All signaling
options are USER SELECTABLE / USER CONFIGURABLE.
USER PROGRAMMABLE dedicated data
channels. The User my specify / define the dedicated data channels
so that they are ALWAYS and COMPLETELY BYPASSED from the
echo-cancellation circuitry - leaving those specifically assigned
dedicated time-slots for digital data transmission (including video
transmission).
The T1 echo canceller supports 2100 Hz
fax / analog data modem tone detection and echo canceller disabling on
all channels. For dedicated digital data or video channels, if you wish
to assign certain specific times-slots of the T1 circuit for dedicated
video you may do so, using our T1 echo cancellers. Our T1 echo
cancellers allow the USER to PROGRAM / ASSIGN dedicated time-slots for
digital data or video transmission. The USER may specify / define the
dedicated data channels so that they are ALWAYS BY-PASSED from the
echo-cancellation circuitry - leaving those dedicated time-slots for
digital data communication / dedicated video transmission only.
Applications for the T1 Echo Cancellers
- Wireless: GSM, CDMA, TDMA, Digital
Cordless, PCS, and Cellular Base Stations.
- Digital Circuit Multiplication Equipment
(DCME) : Satellite Communications and Multiplexers.
- PCS, cellular, mobile, and digital
cordless wireless systems.
- PBX and central office systems.
- Datacomm: Voice Over Frame Relay, Voice
Over ATM, and Voice Over Internet.
- Voice over ATM, Frame Relay or packet
switching systems that provide a separate channel to carry
V.32/V.32bis/V.34 modem and fax transmissions.
- Central Office and PBX: Network Trunks,
Echo Canceller Pool, Common Equipment and Audio Conferencing Bridges
- Voice over datacomm including voice over
Internet (VoIP), voice over ATM, and voice over Frame Relay (VoFR).
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Datacomm Applications
- Voice Over Frame Relay
- Voice Over ATM
- Voice Over Internet / LAN
- Central Office
and PBX Applications
- Network Trunks
- Echo Canceller Pool
- Common Equipment
- Audio Conferencing Bridges
-
Voice Over ATM Applications
- A multi-channel echo canceller resource
or pool is shared among many channels to reduce cost
- Echo cancellation is done at a DS0 level
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Satellite Communications Applications
- Digital Circuit Multiplication Equipment
(DCME)
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Wireless Applications
- GSM, CDMA, TDMA
- Digital Cordless and Cellular
Basestations
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Voice Over Frame Relay, ATM Applications
Application Diagrams for
the T1 Voice Echo Cancellers
Others Echo
Cancellers Solutions:
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