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CX20431-21 参数 Datasheet PDF下载

CX20431-21图片预览
型号: CX20431-21
PDF下载: 下载PDF文件 查看货源
内容描述: AccessRunner ADSL -USB调制解调器设备设置 [AccessRunner ADSL-USB Modem Device Set]
分类和应用: 调制解调器
文件页数/大小: 56 页 / 363 K
品牌: CONEXANT [ CONEXANT SYSTEMS, INC ]
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AccessRunner ADSL-USB Modem Device Set Data Sheet  
1.  
Introduction  
1.1  
Overview  
The Conexant AccessRunnerADSL-USB Modem Device Set combines an “always-on” high speed Asymmetric Digital  
Subscriber Line (ADSL) connection to the telephone line, and Universal Serial Bus (USB) connection to a host PC into a  
single cost-effective solution.  
Conexant’s AccessRunnerADSL 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 Customer Premise Equipment 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 today’s computers by eliminating the need for a  
separate ATM Segmentation and Reassembly (SAR) device, resulting in a cost-effective solution suitable for both full rate and  
G.lite applications. Additionally, host-based software provides support for current industry standards for PPP over ATM (RFC  
2364) and bridged Ethernet over ATM (RFC 1483) for Windows 98 and Windows 2000.  
The USB specification version 1.1 is supported and is the preferred standard method to connect peripherals to PCs.  
During periods of no data transmission, the Conexant ADSL DMT data pump performs idle cell insertion and deletion thus  
unloading this task from the host PC.  
The device set consists of four devices (see Figure 1-1 and Figure 1-2):  
USB Interface Controller (UIC), part no. P5200, in a 176-pin TQFP  
ADSL DMT Data Pump (ADDP), part no. CX11627, in a 176-pin TQFP  
Analog Front End (AFE), part no. CX20431, in a 32-pin TQFP  
Line Driver (LD), part no. CX20441, in a 32-pin TQFP  
ADSL (Asymmetric Digital Subscriber Line) is a transmission technology used to carry user data over a single twisted pair line  
between the Central Office and the Customer Premises. The downstream (Central Office to Customer Premises) direction  
typically supports a much higher data rate than the upstream or return (Customer Premises to Central Office) channel. This  
asymmetric nature lends itself to applications like remote LAN access, Internet access, and video delivery. The downstream  
data rates can go up to 8 Mbps. The upstream data rates can go up to 1 Mbps. Actual data rates depend on the transceiver  
implementation, loop length, impairments, and transmitted power.  
The Conexant ADSL-USB Modem Device Set is based upon a scalable architecture. This architecture enables the device set  
to support splitterless G.lite as well as splittered and splitterless full-rate ADSL. G.lite enables telephone companies to deploy  
consumer-oriented, “always on” 1.5 Mbps Internet access services without the need for splitter equipment, micro-filters, or  
wiring changes at the customer premises.  
1.2  
Applications  
ADSL Customer Premise Equipment  
ADSL USB modems for desktop PCs  
ADSL USB modems for notebook PCs  
CX11627  
ADSL DMT  
Data Pump  
(ADDP)  
CX20441  
Line Driver  
(LD)  
USB  
Interface  
P5200  
USB Interface  
Controller  
(UIC)  
176-Pin TQFP  
TIP  
RING  
TELEPHONE LINE  
CX20431  
Analog Front End  
(AFE)  
Host-Based  
ADSL  
Drivers  
32-Pin TQFP  
176-Pin TQFP  
32-Pin TQFP  
Device Set  
100428_F1-1_SID  
Figure 1-1. AccessRunner ADSL-USB Modem Device Set Simplified Hardware Interface  
Conexant  
100427B  
1-1