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Type of E1 Echo Canceller offered -
upto 10 E1 Cancellers per 19 inch
3U High Chassis
E1 echo canceller: 64ms Bi-directional
and 128ms. Uni-Directional - User Selectable. Our E1 echo canceller is a fully integrated 30 channel echo canceller that cancels echo up to 64ms.
bi-directional / 128ms. uni-directional - user selectable. E1 Inputs and Outputs are balanced 120
Ohms, RJ-45
E1 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:
- 30B+D PRI ISDN (Euro ISDN) signaling,
- 31B (31 voice channels) with out-of-band signaling,
- R2 CAS Signaling,
- SS7 signaling (on any user selected time-slot).
- All signaling options are User
Selectable / User Programmable.
- Allows digital data transmission on user-selected time-slots
- 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.
- Remote access through telnet over LAN / TCP-IP link
(10/100BaseT)
- Local access through COM port (RS232 serial port)
- Easy to use text based CLI commands for management and
configuration
- Adjustable gain/loss settings on all channels. Provides the
user the flexibility to adjust and optimize the voice, transmit and receive levels
- Non-Linear Processor with Comfort Noise Insertion
- Redundant Power Supply (Optional)
- E1 link by-pass on power failure. This feature helps to
maintain the link integrity even in the event of power failure
- Automatic E1 link by-pass upon removal of power supply
- Option for user to select voice echo cancellation or
digital-data transmission selectively on each time-slot 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
Signaling Support
The E1 echo cancellers supports the following
signaling protocols: Signaling protocols supported:
- 30B+D PRI ISDN (Euro ISDN) signaling,
- 31B (31 voice channels) with out-of-band signaling,
- R2 CAS Signaling,
- SS7 signaling (on any user selected time-slot).
- All signaling options are User
Selectable / User Programmable.
- Allows digital data transmission on user-selected time-slots.
Fault Recovery
The echo canceller equipment offers fault
recovery feature. It offers automatic by-pass upon power-supply failure (i.e. it offers E1
circuit by-pass in the event of power supply failure).
Remote Monitoring and Control
- Remote access through telnet over LAN / TCP-IP link
(10/100BaseT)
- Local access through COM port (RS232 serial port)
Redundancy
The echo canceller is equipped to offer
redundant power supply (optional).
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 E1 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 E1 connections on the echo-canceller
card.
USER PROGRAMMABLE SIGNALING OPTION: The E1 echo
cancellers supports the following signaling protocols: Signaling protocols supported:
30B+D PRI ISDN (Euro ISDN) signaling, 31B (31 voice channels) with out-of-band signaling,
R2 CAS Signaling, SS7 signaling (on any user selected time-slot). All signaling options
are User Selectable / User Programmable. Allows digital data transmission on user-selected
time-slots.
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 E1 echo canceller supports 2100 Hz fax / analog data
modem tone detection and echo canceller disabling on all channels.
Applications for
the E1 Echo Cancellers
- Wireless: GSM, CDMA, TDMA, 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 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 (VoATM) and voice over Frame Relay (VoFR).
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
Satellite
Communications Applications
- Digital Circuit Multiplication Equipment (DCME)
Wireless
Applications
- GSM, CDMA, TDMA
- Digital Cordless and Cellular Basestations
Voice Over Frame
Relay, ATM Applications
- Frame Relay and ATM routers and switches introduce large,
variable, and unpredictable delays.
- Echoes from the Public Switched Telephone
Network (PSTN) in combination with the delays from Frame Relay and ATM equipment yield
objectionable speech quality.
Application Diagrams for the E1 Voice Echo Cancellers
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