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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.
- 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)
- T1 link by-pass on power failure. This feature helps to
maintain the link integrity even in the event of power failure
- Automatic T1 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 24-channel voice echo canceller
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
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 T1
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 T1 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 T1
echo-cancellers provide User Programmable 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 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 T1 echo canceller supports 2100 Hz fax / analog data
modem tone detection and echo canceller disabling on all channels.
Applications for
the T1 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 T1 Voice Echo Cancellers
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