Rockwell SoniCrafter BT8960 Manual Do Utilizador
Bt8960
Single-Chip 2B1Q Transceiver
The Bt8960 is a full-duplex 2B1Q transceiver based on Rockwell’s HDSL technol-
ogy. It supports Nx64 kbps transmission of more than 18,000 feet
ogy. It supports Nx64 kbps transmission of more than 18,000 feet
over 26 AWG
copper telephone wire without repeaters. Small size and low power dissipation
make the Bt8960 ideal for line-powered voice pairgain systems capable of provid-
ing four or six clear 64 kbps channels.
make the Bt8960 ideal for line-powered voice pairgain systems capable of provid-
ing four or six clear 64 kbps channels.
The Bt8960 is a highly integrated device that includes all of the active circuitry
needed for a complete 2B1Q transceiver. In the receive portion of the Bt8960, a
variable gain amplifier optimizes the signal level according to the dynamic range
of the analog-to-digital converter. Once the signal is digitized, sophisticated adap-
tive echo cancellation, equalization, and detection DSP algorithms reproduce the
originally transmitted far-end signal.
variable gain amplifier optimizes the signal level according to the dynamic range
of the analog-to-digital converter. Once the signal is digitized, sophisticated adap-
tive echo cancellation, equalization, and detection DSP algorithms reproduce the
originally transmitted far-end signal.
In the transmitter, the transmit source and scrambler operation is programma-
ble via the microcomputer interface. A highly linear digital-to-analog converter
with programmable gain, sets the transmission power for optimal performance. A
pulse-shaping filter and a low distortion line driver generate the signal character-
istics needed to drive a large range of subscriber lines at low-bit error rates.
with programmable gain, sets the transmission power for optimal performance. A
pulse-shaping filter and a low distortion line driver generate the signal character-
istics needed to drive a large range of subscriber lines at low-bit error rates.
Startup and performance monitoring operations are controlled via the micro-
processor interface. C-language source code supporting these operations is sup-
plied under a no-fee license agreement from Rockwell. The Bt8960 includes a
glueless interface to both Intel and Motorola microprocessors.
plied under a no-fee license agreement from Rockwell. The Bt8960 includes a
glueless interface to both Intel and Motorola microprocessors.
Functional Block Diagram
Distinguishing Features
•
Single-chip 2B1Q transceiver solution
•
All 2B1Q transceiver functions inte-
grated into a single monolithic device
– Receiver gain control and A/D
grated into a single monolithic device
– Receiver gain control and A/D
converter
– DSP functions including echo
cancellation, equalization, timing
recovery, and symbol detection
recovery, and symbol detection
– Programmable gain transmit DAC,
pulse-shaping filter and line driver
•
Supports operation from 160 to 416
kbps
kbps
•
Capable of transceiving over the ANSI
T1.601 and ETSI ETR 080 ISDN
test loops
T1.601 and ETSI ETR 080 ISDN
test loops
•
Flexible Monitoring and Control
– Glueless interface to Intel 8051 and
– Glueless interface to Intel 8051 and
Motorola 68302 processors
– Access to embedded filters, perfor-
mance meters and timers
•
Backwards compatible with Bt8952
software API commands
software API commands
•
JTAG/IEEE Std 1149.1-1990
compliant
compliant
•
Single +5 V power supply
operation
operation
•
600 mW power consumption at 288
kbps (typical)
kbps (typical)
•
100-pin PQFP package
•
–40˚C to +85˚C operation
Applications
•
Voice/data pairgain systems
•
Internet connectivity
•
ISDN basic-rate interface
concentrators
concentrators
•
ISDN H0 transport
•
Extended range fractional T1/E1
•
Cellular/microcellular base stations
•
Personal Communications Systems
(PCS) radio ports and cell switches
(PCS) radio ports and cell switches
Analog
Receive
MPU
Bus
Analog
Transmit
Variable
Gain
Amplifier
Microcomputer
Interface
Line
Driver
Pulse-
Shaping
Filter
Program-
mable
Gain
DAC
DAC
Analog-
to-Digital
Converter
Digital
Signal
Signal
Processor
Framer/
Channel
Unit
Interface
Recovered
Data and
Clock
Data and
Clock
Transmit
Data
Data