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ACCESSRUNNER Datasheet

  • ACCESSRUNNER

  • Controller-less. Scalable. Discrete Multitone-based. G.dmt- ...

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AccessRunner錚?/div>
錚?/div>
ADSL Modem Device Set for PCI Applications
Controller-less, Scalable, Discrete Multitone-based, G.dmt- and G.lite-
compliant, ADSL Modem Device Set for PCI Applications
Conexant鈥檚 AccessRunner錚?ADSL modem device set is compliant
with the full-rate ANSI T1.413 Issue 2 and ITU G.dmt (G.992.1)
ADSL standards, and with the splitterless ITU G.lite (G.992.2)
specification. This rate-adaptive solution is designed for controller-
less PCI desktop applications and supports downstream data rates
of up to 8 Mbps and upstream data rates of up to 1 Mbps.
The device set takes advantage of the processing power available
with most new computers by eliminating the need for a separate
microcontroller, resulting in a cost-effective solution suitable for
both G.dmt and G.lite applications. Host-based software provides
support for current industry standards for PPP over AAL5 over
ATM over ADSL and RFC 1483 for Windows 98 and Windows
2000.
The device set, as shown in Figure 1, consists of four chips:
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
PCI bus interface (AccessRunner P46 in a 176-pin TQFP)
DMT-based data pump (AccessRunner 11627 in a 176-pin
TQFP)
Analog front end (AccessRunner 20431 in a 32-pin TQFP)
Line driver (AccessRunner 20441 in a 16-pin SSOP or
32-pin TQFP)
Features
鈥?/div>
Complete controller-less PCI ADSL
solution
鈥?/div>
Compliant with ADSL standards
鈭?/div>
Full-rate ANSI T1.413 Issue 2 and ITU
G.dmt (G.992.1) standards
鈭?/div>
Splitterless ITU G.lite (G.992.2)
specification
鈥?/div>
DMT modulation and demodulation
鈥?/div>
Full-rate adaptive modem
鈭?/div>
Maximum downstream rate of 8 Mbps
鈭?/div>
Maximum upstream rate of 1 Mbps
鈥?/div>
Supports splitterless ADSL
implementation
鈥?/div>
WAN mode support: PPP over AAL5/ATM
over ADSL via Windows 98/2000
鈥?/div>
LAN mode support: RFC 1483 via
Windows 98/2000
鈥?/div>
Compliant with PCI Local Bus
Specification, Revision 2.2
鈥?/div>
Compliant with PCI Bus Power
Management Interface Specification,
Version 1.0
鈥?/div>
Tone detection for low power mode
D20431 AFE Features
PCI Bus
Host-
Based
ADSL
Controller
Software
P46
PCI Bus
Interface
176-pin TQFP
11627
ADSL DMT
Data Pump
176-pin TQFP
20431
Analog Front
End
32-pin TQFP
20441
Line Driver
16-pin TSSOP
Telephone
Line
Figure 1. AccessRunner ADSL Modem for PCI Applications
鈥?/div>
Receive signal path includes:
鈭?/div>
Integrated hybrid receiver circuit with
programmable gain
鈭?/div>
High pass filtering and 27dB of
Automatic Gain Control (AGC) to
improve signal-to-echo ratio
鈭?/div>
14-bit ADC
鈥?/div>
Transmit signal path includes:
鈭?/div>
30dB of AGC for transmit power control
鈭?/div>
Low pass filtering to suppress noise in
the receive band
鈭?/div>
14-bit DAC
Independent digital serial data and control
鈥?/div>
interfaces
Low power tone detection mode.
鈥?/div>
Data Sheet (Preliminary)
Conexant Proprietary Information
Doc. No.100394B
October 19, 1999

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